Fine particle sampling device and fine particle sampling method

Abstract

To provide technique for suppressing reduction of hydrophilic properties on a surface of a rotary cylindrical electrode, in a device sampling fine particles.SOLUTION: A fine particle sampling device 10 sampling fine particles in liquid, comprises: a cylindrical first electrode 22 whose both ends in an axial center direction are open; a second electrode 24 extending in a shaft center direction of the first electrode 22, and arranged in the first electrode 22 with an interval with an inner face 66 of the first electrode 22; a supply part 28 for supplying liquid 68 into the first electrode 22, and storing the liquid 68 in one portion of the inner face 66 in the axial center direction of the first electrode 22; a voltage application part 26 for applying a voltage to a space between the first electrode 22 and the second electrode 24; a drive part 32 for rotating the first electrode 22 around a rotary axis line extending in the axial center direction of the first electrode 22 and passing through the first electrode 22; and a collecting part 30 for collecting the stored liquid 68. The inner face 66 of the first electrode 22 is subjected to hydrophilizing processing, and the liquid 68 is capturing liquid including amphipathic property polymer.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a particle sampling device and a particle sampling method for sampling particles. [Background technology]

[0002] Conventionally, there is known an apparatus and method for sampling fine particles in a gas using a device that utilizes the inertia or centrifugal force of the fine particles (see, for example, Patent Document 1). More specifically, Patent Document 1 discloses an apparatus and method for generating an electrostatic force using a rotating cylindrical electrode to which a liquid for collection is supplied, separating objects to be collected, such as fine particles, from the air and collecting them in the liquid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2021 / 153155 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional devices and methods, there is a concern that when collection is performed continuously for a long period of time, the hydrophilicity of the inner surface of the rotating cylindrical electrode decreases, causing a loss of fine particles due to adsorption to the surface of the rotating cylindrical electrode or deactivation due to denaturation, or that the collection liquid does not spread evenly inside the rotating cylindrical electrode but becomes droplet-like, causing the electric field between the electrode and the collection liquid to become locally large and causing insulation breakdown, resulting in a failure of dust collection and a decrease in collection performance. For this reason, in recent years, there has been a demand for suppressing the decrease in collection performance due to such factors.

[0005] Therefore, the present disclosure has been made in consideration of the above-mentioned conventional problems, and its purpose is to provide a technology that can suppress a decrease in the hydrophilicity of the surface of a rotating cylindrical electrode in an apparatus and method for sampling microparticles. [Means for solving the problem]

[0006] A particle sampling device according to an embodiment of the present disclosure is a particle sampling device for sampling particles in a liquid, comprising: a cylindrical first electrode having both ends open in the axial direction, a second electrode extending in the axial direction of the first electrode and disposed in the first electrode at a distance from the inner surface of the first electrode, a supply unit for supplying liquid into the first electrode and storing the liquid in a part of the inner surface in the direction around the axis of the first electrode, a voltage application unit for applying a voltage between the first electrode and the second electrode, a drive unit for rotating the first electrode around a rotation axis extending in the axial direction of the first electrode and passing through the first electrode, and a recovery unit for recovering the stored liquid. The inner surface of the first electrode has been subjected to a hydrophilization treatment, and the liquid is a collection liquid containing an amphipathic polymer.

[0007] A particle sampling method according to one embodiment of the present disclosure is a particle sampling method using a cylindrical first electrode having both ends open in the axial direction and an inner surface that has been hydrophilized, and a second electrode that extends in the axial direction of the first electrode and is disposed within the first electrode at a distance from the inner surface of the first electrode, and includes a supply step of supplying liquid into the first electrode and storing the liquid in a part of the inner surface in a direction around the axis of the first electrode, a drive step of rotating the first electrode around a rotation axis that extends in the axial direction of the first electrode and passes through the first electrode, a voltage application step of applying a voltage between the first electrode and the second electrode, and a recovery step of recovering the stored liquid. In the supply step, a collection liquid containing an amphipathic polymer is used as the liquid. Liquid is used. Effect of the Invention

[0008] According to the present disclosure, in an apparatus and method for sampling fine particles, it is possible to suppress a decrease in the hydrophilicity of the surface of a rotating cylindrical electrode. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a perspective view showing the appearance of a particulate sampling device according to an embodiment. [Diagram 2] FIG. 2 is a side view showing the appearance of the particulate sampling device of FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an end view taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is a block diagram showing the configuration of the particle sampling device of FIG. [Figure 6] FIG. 6 is a flow chart showing an example of the operation of the particulate sampling device of FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line III-III in FIG. 1, and is an explanatory view for explaining an example of an operation performed by the particle sampling device in FIG. [Figure 8] FIG. 8 is an end view taken along line IV-IV when a liquid containing an amphiphilic polymer is supplied to the particle sampling device of FIG. [Figure 9] FIG. 9 is an external view of a particle sampling system that automatically performs the flow shown in FIG. 6 in the particle sampling device of FIG. [Figure 10] FIG. 10 is an external view of a particulate sampling system equipped with a duct for sampling particulate matter from the air at a remote location. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0011] However, the particle sampling device and particle sampling method according to the present disclosure are not intended to be limited to the configurations shown in the embodiments or drawings described below, and also include configurations equivalent thereto.

[0012] The embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, the arrangement and connection of the components, steps, and the order of steps shown in the following embodiments are merely examples and are not intended to limit the scope of the claims. In addition, each figure is not necessarily a strict illustration. In each figure, substantially the same configuration is given the same reference numeral, and duplicated explanations may be omitted or simplified.

[0013] In the following, terms indicating the relationship between elements, such as parallel and perpendicular, terms indicating the shape of an element, such as cylindrical shape, and numerical ranges do not only indicate the strict meaning, but also include a substantially equivalent range, for example, a difference of about a few percent.

[0014] In the following figures, the X-axis and Y-axis are mutually perpendicular axes on a horizontal plane. The Z-axis is an axis perpendicular to the horizontal plane. On the Z-axis, the positive direction represents vertical upwards, and the negative direction represents vertical downwards.

[0015] (Embodiment 1) Fig. 1 is a perspective view showing the appearance of a particle sampling device 10 according to an embodiment. Fig. 2 is a side view showing the appearance of the particle sampling device 10 of Fig. 1. Fig. 3 is an internal view of the particle sampling device 10 of Fig. 1, and is a cross-sectional view taken along line III-III in Fig. 1. Fig. 4 is an end view taken along line IV-IV in Fig. 1. The particle sampling device 10 according to an embodiment will be described with reference to Figs. 1 to 4.

[0016] As shown in Fig. 1 to Fig. 4, the particle sampling device 10 is a device that samples particles in a liquid. Specifically, the particle sampling device 10 is a device that samples particles in a liquid by collecting particles in a gas in the liquid 68 (described later). For example, the particles include fungi, bacteria, viruses, aerosols, and the like. The particle sampling device 10 includes a duct 12, a first bearing seal 14, a second bearing seal 16, a first flange member 18, a second flange member 20, a first electrode 22, a second electrode 24, a voltage application unit 26, a supply unit 28, a collection unit 30, and a drive unit 32.

[0017] The particulate sampling device 10 is configured by surrounding a rotating first electrode 22 and a second electrode 24 disposed at the center of the first electrode 22 with a duct 12, a first flange member 18, and a second flange member 20. A gas such as air is passed through the inside of the particulate sampling device 10 in a direction that passes through the particulate sampling device 10 (the direction shown by the arrow A in FIG. 2). For example, air may be directly drawn into the particulate sampling device 10 by a pump (not shown) or the like, and the gas may be passed through the particulate sampling device 10. In addition, the particulate sampling device 10 may be installed in a device that has a flow of a gas such as air, such as an air conditioner, an air purifier, or a ventilation opening, and the air may be drawn into the particulate sampling device 10 for processing. In this way, by attaching the particulate sampling device 10 to a device that generates a gas flow, it is not necessary to incorporate a pump or the like for generating a gas flow into the particulate sampling device 10, and a device that is small, quiet, and has a low pressure loss can be easily realized. This allows the particulate sampling device 10 to be installed and incorporated in various places relatively freely. Each component of the particle sampling device 10 will be described below.

[0018] The duct 12 is cylindrical, and rotatably supports the first electrode 22 inside the duct 12. The duct 12 has a main body 42, a first support portion 44, and a second support portion 46. The main body 42, the first support portion 44, and the second support portion 46 are insulating.

[0019] The main body 42 is cylindrical, and one end and the other end in the axial direction of the main body 42 are open. The first support part 44 protrudes radially outward from one end of the main body 42 in the axial direction of the main body 42, and is formed integrally with the main body 42. The first support part 44 is recessed radially outward of the main body 42 and is substantially U-shaped (see FIG. 3). The first support part 44 is annular when viewed from the axial direction of the main body 42. A first bearing seal 14 is disposed inside the first support part 44. The first bearing seal 14 seals the gap between the first support part 44 and a first outer flange part 58 (described later) so that gas does not leak between the first support part 44 and a first outer flange part 58. The first support part 44 rotatably supports the first electrode 22 via the first bearing seal 14. The second support part 46 protrudes from the other end of the main body 42 in the axial direction outward in the radial direction of the main body 42 and is formed integrally with the main body 42. The second support part 46 is recessed outward in the radial direction of the main body 42 and is substantially U-shaped (see FIG. 3). The second support part 46 is annular when viewed from the axial direction of the main body 42. A second bearing seal 16 is disposed inside the second support part 46. The second bearing seal 16 seals the gap between the second support part 46 and a second outer flange part 60 (described later) so that gas does not leak between the second support part 46 and a second outer flange part 60. The second support part 46 rotatably supports the first electrode 22 via the second bearing seal 16.

[0020] The first flange member 18 is cylindrical, and is connected to the duct 12. The first flange member 18 has a main body 48 and a flange 50.

[0021] The main body 48 is cylindrical, and one end and the other end in the axial direction of the main body 48 are open. The flange 50 protrudes radially outward from one end of the main body 48 in the axial direction. and is formed integrally with the main body 48. The flange 50 is annular when viewed from the axial direction of the main body 48. The other axial end of the main body 48 is connected to one axial end of the duct 12.

[0022] The second flange member 20 is cylindrical, and is connected to the duct 12. The second flange member 20 has a main body 52 and a flange .

[0023] The main body 52 is cylindrical, and one and the other axial ends of the main body 52 are open. One axial end of the main body 52 is connected to the other axial end of the duct 12. The flange 54 protrudes radially outward from the other axial end of the main body 52 and is formed integrally with the main body 52. ​​The flange 54 is annular when viewed from the axial direction of the main body 52.

[0024] The first electrode 22 is cylindrical, and both ends in the axial direction of the first electrode 22 are open. The first electrode 22 is connected to the ground via a second electric wire 76 (described later) or the like. The first electrode 22 has a main body 56, a first outer flange portion 58, a second outer flange portion 60, a first inner flange portion 62, and a second inner flange portion 64. For example, the main body 56, the first outer flange portion 58, the second outer flange portion 60, the first inner flange portion 62, and the second inner flange portion 64 are formed using stainless steel such as SUS (Steel Special Use Stainless).

[0025] The main body 56 is cylindrical, and one end and the other end in the axial direction of the main body 56 are open. The axial direction of the main body 56 is the direction in which the axis B of the main body 56 extends (X-axis direction). The main body 56 has external teeth (not shown) on the outer circumferential surface of the main body 56 that mesh with external teeth (not shown) of a gear 86 (described later). An inner surface 66 of the main body 56 is subjected to a hydrophilic treatment. The hydrophilic treatment here is a treatment for processing the inner surface 66 into a minute uneven shape. For example, the hydrophilic treatment is performed by plasma treatment. Also, for example, the hydrophilic treatment is performed by alkali treatment using potassium hydroxide (KOH). Also, an adhesion suppressing member that suppresses adhesion of fine particles is attached to the inner surface 66 of the main body 56. For example, the adhesion suppressing member is a blocking agent such as skim milk, BSA (Bovine Serum Albumin), and PEG (Polyethylene Glycol).

[0026] Details will be described later, but in this embodiment, when sampling is performed, a solution containing an amphiphilic polymer (described below) is supplied into the electrode as a sampling solution (collection liquid), so that the amphiphilic polymer contained in the sampling solution comes into contact with and adheres to the entire inner surface of the electrode, thereby maintaining the hydrophilic state of the inner surface of the electrode.

[0027] The first outer flange 58 protrudes radially outward from one end of the main body 56 in the axial direction of the main body 56 and is formed integrally with the main body 56. The first outer flange 58 is annular about the axis B of the main body 56. In other words, the first outer flange 58 is annular when viewed from the axial direction of the main body 56. The first outer flange 58 is disposed inward of the first bearing seal 14.

[0028] The second outer flange 60 protrudes radially outward from the other end of the main body 56 in the axial direction, and is formed integrally with the main body 56. The second outer flange 60 is annular about the axial center B of the main body 56. In other words, the second outer flange 60 is annular when viewed from the axial direction of the main body 56. The second outer flange 60 is disposed inside the second bearing seal 16.

[0029] The first inner flange portion 62 protrudes radially inward from one end portion of the main body 56 in the axial direction of the main body 56, and is formed integrally with the main body 56. The first inner flange portion 62 is annular about the axial center B of the main body 56. In other words, the first inner flange portion 62 is annular when viewed from the axial direction of the main body 56.

[0030] The second inner flange 64 protrudes radially inward from the other end of the main body 56 in the axial direction, and is formed integrally with the main body 56. The second inner flange 64 is annular around the axis B of the main body 56. In other words, the second inner flange 64 is annular when viewed from the axial direction of the main body 56.

[0031] The first electrode 22 is installed in a position in which the axis B of the main body 56 is parallel to the horizontal direction. The first electrode 22 is supported so as to be rotatable around the axis B of the main body 56 (see arrow C in FIG. 4). In other words, the first electrode 22 is supported so as to be rotatable on its own axis. That is, the first electrode 22 is a member that corresponds to the "rotating cylindrical electrode" in the claims.

[0032] The first electrode 22 stores the liquid 68 on the inner surface 66 of the main body 56. Specifically, the first electrode 22 stores the liquid 68 in a part of the inner surface 66 in the direction around the axis B of the main body 56 (see arrow D in FIG. 4). The stored liquid 68 is located below the axis B of the main body 56. The first electrode 22 also stores the liquid 68 in the part of the inner surface 66 along the axial direction of the main body 56. The first inner flange 62 holds the liquid 68 so that the liquid 68 stored in the part of the inner surface 66 of the main body 56 does not spill out from one end of the main body 56 in the axial direction. The second inner flange 64 holds the liquid 68 so that the liquid 68 stored in the part of the inner surface 66 of the main body 56 does not spill out from the other end of the main body 56 in the axial direction. In this way, the first electrode 22 stores the liquid 68 in a part of the inner surface 66 of the main body 56 so as to prevent the liquid 68 from flowing out of the main body 56. Within the main body 56, above the stored liquid 68, a space 69 is formed which penetrates the main body 56 in the axial direction.

[0033] The second electrode 24 is linear and extends in the axial direction of the body 56 of the first electrode 22. The second electrode 24 is inserted radially inside the body 56 of the first electrode 22 and is located inside the body 56. That is, the second electrode 24 protrudes outward from one end of the body 56 in the axial direction of the body 56 and protrudes outward from the other end of the body 56. The second electrode 24 is disposed at a distance from the inner surface 66 of the body 56 of the first electrode 22 and is disposed near the center of the first electrode 22. The second electrode 24 is disposed in the space 69. In this embodiment, the second electrode 24 is disposed in such a position that the axis of the second electrode 24 coincides with the axis B of the body 56 of the first electrode 22. For example, the second electrode 24 is formed of tungsten or the like.

[0034] The voltage application unit applies a voltage between the first electrode 22 and the second electrode 24. The voltage application unit has a first support 70, a second support 72, a first electric wire 74, and a second electric wire .

[0035] The first support 70 is fixed to the first flange member 18 and is located inside the first flange member 18. The first support 70 is connected to one end of the second electrode 24 in the axial direction and supports the second electrode 24. The second support 72 is fixed to the second flange member 20 and is located inside the second flange member 20. The second support 72 is connected to the other end of the second electrode 24 in the axial direction and supports the second electrode 24. The first support 70 and the second support 72 are conductive and electrically connected to the second electrode 24. The first electric wire 74 is electrically connected to the second electrode 24 via the second support 72. The second electric wire 76 is electrically connected to the first electrode 22 via a gear 86 or the like.

[0036] The voltage application unit 26 is capable of passing electricity of any magnitude and waveform through the first electrode 22 and the second electrode 24 disposed near the center of the first electrode 22 via the first electric wire 74 and the second electric wire 76. In this way, the particulate sampling device 10 performs electrical dust collection of particulate matter. The structure of the second electrode 24 does not have to be linear, and may be plate-like or needle-like. There are no limitations on the structure or installation position, and any other suitable configuration may be used as long as it is possible to form an uneven electric field. For example, the voltage application unit 26 is realized by a power supply circuit including a converter, etc. For example, the voltage application unit 26 applies a DC voltage of 6 kV.

[0037] For example, the voltage application unit 26 applies a voltage between the first electrode 22 and the second electrode 24 so that the second electrode 24 side has a higher potential than the first electrode 22 side. This generates an electric field in the space 69 from the second electrode 24 toward the first electrode 22 (see arrow E in FIG. 3 and arrow E in FIG. 4).

[0038] The supply unit 28 supplies the liquid 68 into the first electrode 22, and causes the liquid 68 to accumulate on a part of the inner surface 66 of the first electrode 22 in the direction around the axis B. In other words, the supply unit 28 supplies the liquid 68 into the first electrode 22 in order to cause the liquid 68 to accumulate on a part of the inner surface 66 of the first electrode 22 in the direction around the axis B. In this manner, the liquid 68 supplied by the supply unit 28 is accumulated on the inner surface 66 of the body 56 of the first electrode 22. The supply unit 28 has a tank 78 and an injection unit 80. The supply unit 28 may supply the liquid from the opening side of the first electrode 22 (one end side in the axial direction of the body 42) as shown in FIG. 3, or may supply the liquid from the opening by partially opening a side surface of the first electrode 22.

[0039] The tank 78 holds the liquid 68 to be supplied into the first electrode 22. The liquid 68 held in the tank 78 is discharged from the injection section 80 by a pump (not shown) or the like, and supplied into the main body 56 of the first electrode 22. In this manner, the tank 78 is provided for storing the liquid 68, such as a collection liquid for influenza virus sensing, in advance, and the liquid 68 is supplied into the first electrode 22 through the injection section 80. This supply is not limited to once per sampling, and may be multiple times depending on the amount of liquid in the first electrode 22.

[0040] In this embodiment, the supply unit 28 supplies a liquid for the analysis of the particles as the liquid 68. For example, the liquid for the analysis of the particles means a liquid used for the analysis, a liquid for maintaining the activity of the target substance contained in the particles for the analysis, a liquid for giving a label or the like to the target substance contained in the particles for the analysis, a liquid for protecting the target substance contained in the particles for the analysis, or any combination thereof. For example, when the target substance is an influenza virus, the liquid 68 can be a liquid for dissolving and preserving the virus, such as physiological saline, PBS (Phosphate-Buffered Saline) buffer, EDTA (Ethylene Diamine Tetraacetic Acid) buffer, or bicarbonate buffer, or a liquid containing a substance that specifically binds to the virus and emits magnetism or fluorescence. The liquid 68 does not have to be a liquid for the analysis of the particles, and may be, for example, pure water.

[0041] The target substance is not limited to influenza viruses. For example, the target substance may be other viruses or a living organism other than a virus (e.g., bacteria). The target substance may not be a living organism, but may be an environmental pollutant or an allergen.

[0042] In this embodiment, the liquid 68 contains an amphipathic substance such as an amphipathic polymer. An amphipathic polymer is a polymer that has a hydrophilic portion and a hydrophobic portion within the polymer. For example, PEG (Polyethylene Glycol) or dextran is used as the hydrophilic portion, and PLA (Polylactic Acid) or PLGA (Polylactic co Glycolic Acid) is used as the hydrophobic portion. In this case, the amount of the substance contained in the collection liquid is about 0.1 weight percent (wt%) to 1.0 weight percent (wt%). If the amount of the substance is less than 0.1 weight percent, the hydrophilicity required for efficient collection cannot be maintained, and if the amount is more than 1.0 weight percent, the hydrophilicity required for efficient collection cannot be maintained. If the amount is too large, there is a concern that the biological properties such as the infectivity or antigenicity of the target substance to be collected may be weakened. By supplying the liquid 68 containing the amphipathic polymer and rotating the first electrode 22, the hydrophobic part of the amphipathic polymer is adsorbed on the surface of the inner surface 66 of the first electrode 22, and the hydrophilic part is oriented so as to be exposed to the liquid 68 side. This increases the affinity at the interface between the inner surface 66 of the first electrode 22 and the liquid 68, and the surface of the inner surface 66 of the first electrode 22 can be hydrophilized. In other words, the hydrophilized state of the inner surface 66 of the first electrode 22 can be maintained. This makes it possible to suppress the adsorption of the target substance such as influenza viruses onto the inner surface 66 of the first electrode 22, and to reduce the loss of the target substance in the liquid 68.

[0043] Furthermore, by including an amphiphilic polymer in the liquid 68, the liquid 68 spreads evenly within the first electrode 22, and the distance between the second electrode 24 at the center and the liquid 68 can be kept constant. This suppresses dielectric breakdown between the liquid 68 and the second electrode 24, and enables normal discharge of the second electrode 24 (described later) and the formation of a desired electric field between the second electrode 24 and the first electrode 22, enabling normal sampling.

[0044] The recovery unit 30 recovers the liquid 68 stored in a part of the inner surface 66 in the direction around the axis B of the first electrode 22. The recovery unit 30 has a tank 82 and an extraction unit 84. The liquid 68 stored in a part of the inner surface 66 in the direction around the axis B of the first electrode 22 is sucked from the extraction unit 84 by a pump (not shown) or the like, and is held in the tank 82 and recovered. In this way, the liquid 68 such as the collected liquid in which the fine particles have accumulated is sucked through the extraction unit 84 and held in the tank 82. The recovery of the liquid by the recovery unit 30 may be performed from the opening side of the first electrode 22 (one end side in the axial direction of the main body 42) as shown in FIG. 3, or the side surface of the first electrode 22 may be partially opened and the liquid may be recovered from the opening. The recovery may also be performed using the opening used for supply by the supply unit 28. The recovery does not necessarily have to be performed in one supply or one sampling, and may be performed after multiple supplies and samplings.

[0045] The driving unit 32 rotates the first electrode 22 around a rotation axis that extends in the axial direction of the body 56 of the first electrode 22 and passes through the first electrode 22. In this embodiment, the rotation axis coincides with the axis B of the body 56. That is, in this embodiment, the driving unit 32 rotates the first electrode 22 around the axis B of the body 56 of the first electrode 22. The driving unit 32 has a gear 86 and a motor 88 for rotating the gear 86. The gear 86 has external teeth (not shown) that mesh with external teeth (not shown) of the first electrode 22. The gear 86 is rotated by the motor 88 (see arrow F in FIG. 4), so that the first electrode 22 rotates around the axis B of the body 56 (see arrow C in FIG. 4). In this manner, the first electrode 22 is rotated by the gear 86 driven by the motor 88.

[0046] In addition, gas outside the particle sampling device 10 may pass through the inside of the second flange member 20, pass through the inside of the main body 56 of the first electrode 22, and be released to the outside of the particle sampling device 10 from the first flange member 18.

[0047] Fig. 5 is a block diagram showing the functional configuration of the particle sampling device 10. The functional configuration of the particle sampling device 10 will be described with reference to Fig. 5.

[0048] As shown in FIG. 5, the particle sampling device 10 further includes a control unit 90.

[0049] The control unit 90 is electrically connected to the voltage application unit 26, the supply unit 28, the collection unit 30, and the drive unit 32. The control unit 90 controls the voltage application unit 26, the supply unit 28, the collection unit 30, and the drive unit 32. For example, the control unit 90 is realized by a microcomputer. However, it may be implemented by a processor or a dedicated circuit.

[0050] Next, the operation of the particle sampling device 10 configured as above will be described. FIG. 6 is a flow chart showing an example of the operation of the particle sampling device 10. FIG. 7 is an explanatory diagram for explaining an example of the operation of the particle sampling device 10, showing the movement of the virus inside the particle sampling device 10 until the virus is actually collected. With reference to FIG. 6 and FIG. 7, an example of the operation of the particle sampling device 10 including the flow of capturing influenza viruses 1, collecting influenza viruses 1 in liquid, and collecting liquid 68 in this embodiment will be described. Here, in order to collect influenza viruses 1, which are thought to be airbornely transmitted, as a liquid sample that can be analyzed by a sensor or the like, collection in liquid is performed by the particle sampling device 10.

[0051] 6, first, supply unit 28 supplies liquid 68 as a collection liquid into first electrode 22, and causes liquid 68 to accumulate in a part of inner surface 66 in a direction around axis B of first electrode 22 (step S1: supply step). For example, when a user operates an arbitrary operation button (illustrated), supply unit 28 is operated, and liquid 68 is supplied into body 56 of first electrode 22.

[0052] As shown in FIG. 7, liquid 68 is supplied into the body 56 of the first electrode 22, and the liquid 68 is stored in a part of the inner surface 66 in the direction around the axis B of the body 56 of the first electrode 22.

[0053] The driving unit 32 rotates the first electrode 22 around the axis B (step S2: driving step). For example, the user may operate an arbitrary operation button (illustrated) or the like to operate the driving unit 32 and rotate the first electrode 22.

[0054] As shown in FIG. 7, the first electrode 22 rotates around the axis B in a state where the liquid 68 is stored in a part of the inner surface 66 in the direction around the axis B of the main body 56 of the first electrode 22. In other words, the first electrode 22 rotates around the axis B in a state where the liquid 68 is stored below the axis B so that the liquid 68 does not flow out of the main body 56. As a result, the inner surface 66 of the first electrode 22 contacts the stored liquid 68 sequentially. As a result, the amphipathic polymer contained in the liquid 68 contacts and adheres to the surface of the inner surface 66 of the first electrode 22, making the inner surface 66 of the first electrode 22 hydrophilic. In other words, the hydrophilic state of the inner surface 66 of the first electrode 22 is maintained. As a result, it is possible to suppress the adsorption of the target substance such as influenza virus onto the inner surface 66 of the first electrode 22, and the loss of the target substance in the liquid 68 is reduced. Furthermore, the liquid 68 spreads uniformly inside the first electrode 22, and the distance between the second electrode 24 at the center and the liquid 68 can be kept constant. This suppresses dielectric breakdown between the liquid 68 and the second electrode 24, and enables normal discharge of the second electrode 24 (described later) and the formation of a desired electric field between the second electrode 24 and the first electrode 22, enabling normal sampling.

[0055] Furthermore, by using the liquid 68 containing the amphiphilic polymer as the collection liquid, it is not necessary to treat the electrodes each time for hydrophilization treatment such as plasma treatment, and the liquid can be used as is as a sample for analysis such as PCR (Polymerase Chain Reaction).

[0056] 6, next, voltage application unit 26 applies a voltage between first electrode 22 and second electrode 24 (step S3: voltage application step). For example, a user may operate an arbitrary operation button (illustrated) or the like to operate voltage application unit 26 and apply a voltage between first electrode 22 and second electrode 24.

[0057] As shown in Figure 7, the particle sampling is performed by a given air flow (see arrow A in Figure 7). Influenza viruses 1 in the gas introduced into the inside of the testing device 10 are first charged either positively or negatively by ions 2 released by the discharge of the second electrode 24 to which a high voltage is applied. Here, a case in which influenza viruses 1 are positively charged will be described.

[0058] The influenza viruses 1 in an electrically charged state move along a trajectory 3 due to an electric field (see arrow E in FIG. 7) formed between the second electrode 24 and the first electrode 22, and are collected on the inner surface 66 of the first electrode 22. In this manner, the influenza viruses 1 adhere to the inner surface 66 of the first electrode 22 and are collected on the inner surface 66.

[0059] 7, the influenza viruses 1 collected on the inner surface 66 are collected by the liquid 68 stored in the main body 56 of the first electrode 22 at any timing. Specifically, the influenza viruses 1 attached to the inner surface 66 of the main body 56 of the first electrode 22 come into contact with the stored liquid 68, and are separated from the inner surface 66 and collected in the liquid 68. The movement (rotation) of the first electrode 22 rotated by the motor 88 and the gear 86 makes it possible to wash away the entire surface of the inner surface 66 of the first electrode 22 with the accumulated (stored) liquid 68.

[0060] In addition, when the inner surface 66 of the first electrode 22 has been hydrophilized, a voltage may be applied between the first electrode 22 and the second electrode 24 before rotating the first electrode 22 around the axis B, and the first electrode 22 may be rotated around the axis B with a voltage being applied between the first electrode 22 and the second electrode 24.

[0061] Returning to FIG. 6, finally, the collecting unit 30 collects the stored liquid 68 (step S4: collecting step). For example, at any timing after a certain period of operation, the liquid 68 can be collected into the collecting unit 30 (tank 82) through the extracting unit 84, and a liquid sample (liquid 68) containing influenza viruses 1 separated from the gas can be obtained. Also, for example, the user may operate any operation button (illustrated) or the like to operate the collecting unit 30 and collect the liquid 68 stored in the main body 56 of the first electrode 22.

[0062] As described above, the particle sampling device 10 according to this embodiment is capable of recovering influenza viruses 1 from the air into the liquid 68 at a high concentration.

[0063] Furthermore, the particle sampling device 10 can accumulate particles in the liquid 68 stored in the first electrode 22 without circulating the liquid 68, and therefore can easily collect particles at a high concentration in the liquid 68. Furthermore, the particle sampling device 10 does not require the provision of a device for circulating the liquid 68, and is therefore a device that can easily achieve miniaturization and energy savings.

[0064] Furthermore, by including an amphipathic polymer in the liquid 68, the inner surface 66 of the first electrode 22 can be kept hydrophilic at all times, and dielectric breakdown caused by the supplied liquid 68 approaching a part of the second electrode 24 on the center side can be suppressed, allowing the device to be used safely. In addition, since the liquid 68 contains an amphipathic polymer during dust collection and subsequent recovery, adsorption loss on the dust collection electrode surface or in the recovery container can be suppressed, allowing a more concentrated sample to be obtained. Furthermore, by supplying the liquid 68 containing an amphipathic polymer as the collection liquid, there is no need to process the electrodes each time for hydrophilization, and the sample can be used as it is for analysis such as PCR.

[0065] As described above, the particle sampling device 10 according to the present embodiment is a particle sampling device for sampling particles in a liquid, and is cylindrical. The collection device includes a first electrode 22 having an opening at one end thereof, a second electrode 24 extending in the axial direction of the first electrode 22 and disposed in the first electrode 22 at a distance from an inner surface 66 of the first electrode 22, a supply unit 28 that supplies liquid into the first electrode 22 and causes a liquid 68 to accumulate in a part of the inner surface 66 in a direction around the axis B of the first electrode 22, a voltage application unit 26 that applies a voltage between the first electrode 22 and the second electrode 24, a drive unit 32 that rotates the first electrode 22 around a rotation axis that extends in the axial direction of the first electrode 22 and passes through the first electrode 22, and a recovery unit 30 that recovers the accumulated liquid 68. The inner surface 66 of the first electrode 22 has been subjected to a hydrophilic treatment, and the liquid 68 is a collection liquid containing an amphipathic polymer.

[0066] According to this, the voltage application unit 26 applies a voltage between the first electrode 22 and the second electrode 24, so that an electric field is generated between the first electrode 22 and the second electrode 24, and the fine particles in the gas in the first electrode 22 adhere to the inner surface 66 of the first electrode 22. In addition, since the liquid 68 contains an amphipathic polymer, the supplied liquid 68 spreads uniformly in the first electrode 22. In addition, the driving unit 32 rotates the first electrode 22, so that the inner surface 66 of the first electrode 22 sequentially comes into contact with the liquid 68 that spreads uniformly and is stored in a part of the inner surface 66 in the direction around the axis B of the main body 56, and the fine particles that adhere to the inner surface 66 are accumulated in the liquid 68. Even during this storage, the adsorption of the attached fine particles is suppressed by the amphipathic polymer on the surface of the inner surface 66 of the first electrode 22. In addition, the recovery unit 30 recovers the stored liquid 68, so that the liquid 68 in which the fine particles have accumulated is obtained. In this way, the particles guided into the particle sampling device 10 are deposited on the inner surface 66 of the first electrode 22 by electrostatic dust collection, and then accumulated in the liquid 68 by the rotation of the first electrode 22, so that the particles can be sampled efficiently. In addition, since there is no need to circulate the liquid 68, the amount of the liquid 68 can be reduced. In this way, by accumulating the particles in a small amount of liquid 68, the concentration of the particles in the liquid 68 can be easily increased, and the particles can be sampled efficiently. In addition, by supplying the liquid 68 containing an amphipathic polymer as a collection liquid, there is no need to treat the electrodes each time for hydrophilization treatment, and the sample can be used as it is as a sample for analysis such as PCR.

[0067] In the particle sampling device 10 according to this embodiment, the inner surface 66 of the first electrode 22 is subjected to a hydrophilic treatment.

[0068] According to this, when the fine particles adhering to the inner surface 66 come into contact with the stored liquid 68, they are easily detached from the inner surface 66. Therefore, loss of the fine particles collected on the inner surface 66 during collection can be suppressed, and the fine particles can be sampled more efficiently.

[0069] In the particle sampling device 10 according to this embodiment, an adhesion suppression member for suppressing adhesion of particles is attached to the inner surface 66 of the first electrode 22.

[0070] According to this, when the fine particles adhering to the inner surface 66 come into contact with the stored liquid 68, they are easily detached from the inner surface 66. Therefore, loss of the fine particles collected on the inner surface 66 during collection can be suppressed, and the fine particles can be sampled more efficiently.

[0071] In the particle sampling device 10 according to this embodiment, the supply unit 28 supplies, as the liquid 68, a liquid for analyzing particles.

[0072] This allows the target substance contained in the particles to be easily extracted. In addition, by selecting an appropriate liquid 68 according to the purpose or application, it is possible to implement an appropriate detection protocol and suppress damage to the sample.

[0073] In the particle sampling device 10 according to the present embodiment, the amphiphilic polymer is It has a hydrophilic portion and a hydrophobic portion, and the hydrophilic portion is PEG (Polyethylene The hydrophobic portion is composed of PLA (Polylactic Acid) or PLGA (Polylactic co Glycolic Acid).

[0074] According to this, by attaching the amphiphilic polymer to the inner surface 66 of the first electrode 22, the surface of the inner surface 66 of the first electrode 22 can be reliably made hydrophilic.

[0075] In the particle sampling device 10 according to the present embodiment, the liquid 68 is a collection liquid containing 0.1 weight percent to 1.0 weight percent of the amphiphilic polymer.

[0076] This allows the surface of the inner surface 66 of the first electrode 22 to be in a hydrophilic state that allows the target substance and the like contained in the fine particles to be efficiently captured.

[0077] Furthermore, in the particle sampling device 10 of this embodiment, the sample (collected liquid) obtained by the recovery section 30 may be directly analyzed using an analytical device such as a PCR device to quantify the virus concentration, and the amount of virus present in the space may be quantified based on the obtained quantitative result, the amount of air processed by the particle sampling device 10, and the collection efficiency specific to the device.

[0078] This makes it possible to estimate the concentration of viruses in the air, and by comparing it with the airborne virus concentration during a known epidemic, it is possible to quantify the infection risk in the sampled air. Furthermore, quantification using this analysis device can be performed at a different location after the sample is collected, or can be performed in-line by connecting it to the particle sampling device 10.

[0079] Furthermore, in the particle sampling device 10 of this embodiment, by supplying a liquid 68 containing an amphiphilic polymer as a collection liquid, the decrease in hydrophilicity of the inner surface 66 is initialized each time sampling is performed, the rate of loss of the target substance during sampling becomes constant, and it is possible to suppress variation from sampling to sampling.

[0080] In addition, in conventional sampling devices, it has been desired to use an amphipathic substance such as an amphipathic polymer as a collection liquid in order to hydrophilize the liquid and suppress loss. However, since it is necessary to bubble air into the collection liquid or to strongly stir the collection liquid, it is practically difficult to use an amphipathic polymer when the collection liquid is stirred because the amphipathic polymer wraps around the air contained in the collection liquid when stirred, generating a lot of bubbles, causing the collection liquid to overflow outside the sampling device. However, in the particle sampling device 10 according to the present embodiment, even if a liquid 68 containing an amphipathic polymer is supplied as a collection liquid, the stirring caused by the rotation of the first electrode 22 is small, so no bubbles are generated and the device can be used without problems.

[0081] The particle sampling method according to the present embodiment is a method using a cylindrical first electrode 22, both ends of which are open in the axial direction, and an inner surface of which is hydrophilized, and a second electrode 24 extending in the axial direction of the first electrode 22 and disposed in the first electrode 22 at a distance from an inner surface 66 of the first electrode 22, and includes a supply step (step S1) of supplying a liquid 68 into the first electrode 22 and storing the liquid 68 in a part of the inner surface 66 in the direction around the axis of the first electrode 22, a drive step (step S2) of rotating the first electrode 22 around a rotation axis that extends in the axial direction of the first electrode 22 and passes through the first electrode 22, a voltage application step (step S3) of applying a voltage between the first electrode 22 and the second electrode 24, and a recovery step (step S4) of recovering the stored liquid 68. In the cap, a collection liquid containing an amphiphilic polymer is used as the liquid 68.

[0082] According to this, the rotation of the first electrode 22 in the driving step causes the inner surface 66 of the first electrode 22 to come into contact with the stored liquid 68 in sequence, so that the amphipathic polymer contained in the liquid 68 comes into contact with and adheres to the surface of the inner surface 66 of the first electrode 22, hydrophilizing the inner surface 66 of the first electrode 22. Meanwhile, the particles that come into contact with the liquid 68 that is uniformly spread and stored in a portion of the inner surface 66 of the first electrode 22 in the direction around the axis B of the main body 56 and adhere to the inner surface 66 are accumulated in the liquid 68. At this time, the amphipathic polymer on the surface of the inner surface 66 of the first electrode 22 suppresses adsorption of the adhered particles. Then, in the recovery step, the stored liquid 68 is recovered to obtain the liquid 68 in which the particles have accumulated. Here, the liquid 68 containing the amphipathic polymer is used as the collection liquid, so that there is no need to perform plasma treatment or the like on the electrode each time in order to hydrophilize the inner surface 66 of the first electrode 22, and the electrode can be used as it is as a sample for analysis such as PCR. Furthermore, since the decrease in hydrophilicity of the inner surface 66 of the first electrode 22 is initialized each time sampling is performed, the loss rate of the target substance during sampling becomes constant, making it possible to suppress variation from sampling to sampling.

[0083] In addition, in the particle sampling method according to this embodiment, the supply step may be performed at regular time intervals, the amount of stored liquid 68 may be kept constant, the drive step and the voltage application step may be performed, and the stored liquid 68 may be recovered in the recovery step.

[0084] In this way, the amount of the stored liquid 68 becomes constant, so that the variation in concentration due to the amount of stored liquid 68 between each sampling is suppressed, and the accuracy of sampling can be improved. Similarly, by making the amount of stored liquid 68 constant, it is possible to keep the distance between the liquid 68 and the second electrode 24 constant, and the variation between the electric field between the liquid 68 and the second electrode 24 generated when a voltage is applied and during each sampling can be suppressed, so that the accuracy of sampling can be improved and the estimation of the sampling performance can be simplified. In addition, when the environmental humidity is higher or lower than normal, the amount of evaporation of the stored liquid 68 changes depending on the environmental humidity, and there is a risk of discharge failure of the second electrode 24 due to an excess of liquid 68, and loss or inactivation of the sampled fine particles due to depletion of liquid 68. However, by supplying liquid 68 at a constant time interval set arbitrarily, these occurrences can be suppressed.

[0085] (Embodiment 2) In the above-mentioned first embodiment, the particle sampling device 10 in which the voltage application unit 26, the supply unit 28, the collection unit 30, and the drive unit 32 are arranged independently has been described, but the present invention is not limited to this. For example, as shown in FIG. 9, these may be integrated into a particle sampling system 110. Hereinafter, the particle sampling system 110 will be described with reference to FIG. 9. FIG. 9 is an external view of the particle sampling system 110 that automatically performs the flow described in FIG. 6 in the particle sampling device 10 of FIG. 1.

[0086] As shown in FIG. 9, the particle sampling system 110 includes a particle sampling device 10, a suction fan 111, a housing 112, a voltage control unit 113, a liquid flow path port 114, a touch panel 115, a voltage display unit 116, an air volume control unit 117, a fan power button 118, and a voltage application button 119.

[0087] The housing 112 is a member that constitutes the outer frame of the particle sampling system 110. In the housing 112, the control unit 90, the voltage application unit 26, the supply unit 28, the collection unit 30, and the drive unit 32 described in the particle sampling device 10 are incorporated.

[0088] The suction fan 111 is a device for passing air through the particulate sampling system 110, and is installed within the particulate sampling system 110.

[0089] Touch panel 115 is a display unit for operating control unit 90, and is installed on one side of housing 112. By operating touch panel 115, each control can be turned on / off and numerical values ​​can be controlled.

[0090] The voltage application button 119 is a master power switch for turning the voltage application unit 26 on and off, and the voltage to be applied to the electrodes of the particle sampling device 10 is determined by adjusting the voltage control unit 113 while watching the voltage value displayed on the voltage display unit 116.

[0091] The fan power button 118 is a main power switch for turning the suction fan 111 on and off, and controls the volume of air drawn into the particle sampling device 10 while adjusting the air volume control section 117 .

[0092] The liquid flow path port 114 is a port for supplying liquid from an external liquid tank or the like by the supply unit 28, and the liquid is supplied by connecting this port with a tube or the like. Alternatively, it is a port for discharging the liquid collected by the collection unit 30 to a collection tank, and the liquid is discharged to the connection destination by connecting this port with a tube or the like. This liquid may be a sample after collection or waste liquid during washing, and the discharge destination may be switched by switching the port.

[0093] Even with this configuration, the effects described in the first embodiment can be obtained.

[0094] In the above-mentioned second embodiment, the particle sampling apparatus 10 and the integrated device (particle sampling system 110) have been described in a form in which air is sucked in from the vicinity of the flange 50 (described later), but the present invention is not limited to this. For example, a particle sampling system 110a for processing air at a remote position as shown in FIG. 10 may be used. Hereinafter, the particle sampling system 110a will be described with reference to FIG. 10. FIG. 10 is an external view of the particle sampling system 110a provided with a duct for sampling particles from the air at a remote position.

[0095] The particulate sampling system 110 a includes a particulate sampling device 10 , a flange 50 , a flexible duct 150 , and a suction port 152 .

[0096] The flange 50 is a member attached to the air inlet of the particulate sampling device 10. A flexible duct 150 is connected to the flange 50.

[0097] Flexible duct 150 is a bendable tubular member made of plastic, metal, rubber, or the like. One end of the opening of flexible duct 150 is connected to flange 50, and the other end of the opening of flexible duct 150 serves as suction port 152. Then, as suction fan 111 operates, air 154 and the like within the space is sucked in the direction of suction direction arrow 151 from new suction port 152. This makes it possible to suck in object 153 contained in air 154 at a distant position, and also makes it possible for a user to operate flexible duct 150 to capture air at any desired position.

[0098] (Other embodiments) In the above-described first embodiment, the main body 56 of the first electrode 22 is cylindrical, but the present invention is not limited to this. For example, the main body of the first electrode may be an elliptical cylinder, a polygonal cylinder, or the like.

[0099] In the above-mentioned first embodiment, the first electrode 22 is described as being installed with the axis B of the main body 56 parallel to the horizontal direction, but the present invention is not limited thereto, and the first electrode 22 does not have to be installed with the axis B of the main body 56 parallel to the horizontal direction. For example, the first electrode 22 may be installed with the axis B of the main body 56 tilted relative to the horizontal direction, and it is sufficient that the liquid 68 can be stored in a part of the inner surface 66 in the direction around the axis B of the main body 56 so that the liquid 68 does not flow out of the main body 56. In other words, it is sufficient that the first electrode 22 is disposed in a position that allows the liquid 68 to be stored on the inner surface 66.

[0100] In the above-mentioned first embodiment, the second electrode 24 is described as being installed in a position in which the axis of the second electrode 24 coincides with the axis B of the body 56 of the first electrode 22. However, the present invention is not limited to this, and the second electrode 24 does not have to be installed in a position in which the axis of the second electrode 24 coincides with the axis B of the body 56 of the first electrode 22. For example, the second electrode 24 may be installed in a position in which the axis of the second electrode 24 is inclined with respect to the axis B of the body 56, and it is sufficient that the second electrode 24 extends at least in the axial direction of the body 56 of the first electrode 22. Also, for example, the second electrode 24 may be installed in a position in which the axis of the second electrode 24 does not coincide with the axis B of the body 56 of the first electrode 22, and the axis of the second electrode 24 is parallel to the axis B of the body 56 of the first electrode 22.

[0101] In the above-mentioned first embodiment, the second electrode 24 is linear, but the present invention is not limited to this. For example, the second electrode may be plate-shaped or needle-shaped.

[0102] In the above-described first embodiment, a case has been described in which one second electrode 24 is disposed within the first electrode 22, but this is not limiting. For example, a plurality of second electrodes may be disposed within the first electrode.

[0103] In the above-described first embodiment, the second electrode 24 protrudes outward from one end of the main body 56 and protrudes outward from the other end of the main body 56. However, the present invention is not limited to this. For example, the length of the second electrode 24 may be the same as the length of the main body 56, or may be shorter than the length of the main body 56.

[0104] In the above-mentioned first embodiment, the case where the driving unit 32 rotates the first electrode 22 around the axis B of the body 56 of the first electrode 22 has been described, but the present invention is not limited to this. For example, the driving unit may rotate the first electrode around a rotation axis that is slightly inclined with respect to the axis of the body of the first electrode. The driving unit may also rotate the first electrode around a rotation axis that is parallel to the axis of the body of the first electrode. The driving unit may rotate the first electrode around a rotation axis that extends in the axial direction of the first electrode and passes through the first electrode. [Industrial Applicability]

[0105] The present disclosure is widely applicable to devices and methods for sampling fine particles such as aerosols from a gas such as air. [Explanation of symbols]

[0106] 10. Particulate sampling device 12 Duct 14 No. 1 bearing seal 16 No. 2 bearing seal 18 First flange member 20 Second flange member 22 1st electrode 24 2nd electrode 26 Voltage application section 28 Supply section 30 Collection Department 42, 48, 52, 56 Main unit 44 1st support part 46 Second support part 50, 54 flange 58 First outer flange 60 Second outer flange 62 First inner flange 64 Second inner flange 66 Inside 68 liquid 69 Space 70 First support 72 Second support 74 First Electric Wire 76 Second Wire 78 Tank 80 Injection part 82 Tank 84 Extraction part 86 Gear 88 Motor 90 Control section 110, 110a Particulate Sampling System 111 Suction fan 112 Cabinet 113 Voltage control section 114 Liquid flow port 115 Touch Panel 116 Voltage display unit 117 Air volume control unit 118 Fan power button 119 Voltage application button 150 Flexible Duct 151 Suction direction arrow 152 Suction port 153 Object 154 Air

Claims

1. A particle sampling device for sampling particles in a liquid, comprising: a first electrode that is cylindrical and has both ends in an axial direction that are open; a second electrode extending in an axial direction of the first electrode and disposed within the first electrode at a distance from an inner surface of the first electrode; a supply unit that supplies a liquid into the first electrode and causes the liquid to accumulate in a portion of the inner surface in a direction around the axis of the first electrode; a voltage application unit that applies a voltage between the first electrode and the second electrode; a drive unit that rotates the first electrode around a rotation axis that extends in an axial direction of the first electrode and passes through the first electrode; A recovery section that recovers the stored liquid; Equipped with the inner surface of the first electrode is subjected to a hydrophilic treatment; The liquid is a collection liquid containing an amphiphilic polymer. Particulate sampling device.

2. An adhesion suppression member that suppresses adhesion of the fine particles is attached to the inner surface of the first electrode.

2. The particulate sampling device according to claim 1.

3. The amphiphilic polymer has a hydrophilic portion and a hydrophobic portion, The hydrophilic portion is composed of PEG (Polyethylene Glycol) or dextran, The hydrophobic portion is composed of PLA (Polylactic Acid) or PLGA (Polylactic co Glycolic Acid), 3. The particle sampling device according to claim 1 or 2.

4. The liquid is a collection liquid containing 0.1 weight percent to 1.0 weight percent of the amphiphilic polymer.

3. The particle sampling device according to claim 1 or 2.

5. A method for sampling fine particles using a first electrode that is cylindrical, has both ends in an axial direction thereof open, and has an inner surface that has been hydrophilically treated, and a second electrode that extends in an axial direction of the first electrode and is disposed within the first electrode at a distance from the inner surface of the first electrode, a supplying step of supplying a liquid into the first electrode and storing the liquid in a part of the inner surface in a direction around the axis of the first electrode; a driving step of rotating the first electrode around a rotation axis extending in an axial direction of the first electrode and passing through the first electrode; a voltage application step of applying a voltage between the first electrode and the second electrode; A recovery step of recovering the stored liquid; Equipped with A method for sampling fine particles, wherein the supplying step uses a collection liquid containing an amphiphilic polymer as the liquid.

6. The supply step is carried out at regular time intervals; The driving step and the voltage application step are performed while keeping the stored liquid constant; Recovering the liquid stored in the recovery step. The method for sampling fine particles according to claim 5.

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