Zeta potential measurement jig set

Abstract

To provide a zeta-potential measurement jig set capable of changing a sample or performing plating treatment with simple operation.SOLUTION: A zeta-potential measurement jig set comprises a frame body and a measurement jig fixed to the frame body. The frame body includes first and second holding walls arranged to face each other, a bottom wall that connects lower ends of the first and second holding walls and has an anode plate and a cathode plate, and a first lock portion having an arm shape. The measurement jig includes a lower stage block of which the bottom has an anode hole portion and a cathode hole portion, at which the anode plate and the cathode plate are respectively located, and that is disposed on the bottom wall; a cell having a recess in which a sample is disposed and a cell communication hole, and disposed on the lower stage block; a middle stage block having a frame-like shape surrounding the recess in a plan view, and disposed on the cell; an upper stage member disposed on the middle stage block and covering an upper surface of the recess; and a second lock portion pressing the upper member toward the bottom wall side. The first lock portion presses the middle stage block toward the bottom wall side to integrate the frame body, the lower stage block, the cell, and the middle stage block.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a jig set for measuring zeta potential. [Background technology]

[0002] Electrophoretic mobility measurement devices are known that measure the electrophoretic mobility and zeta (zeta) potential of particles moving in a sample cell container under the influence of an electric field. Electrophoretic mobility measurement devices irradiate light onto a sample to which an electric field is applied, and detect the scattered light by the sample with a photodetector. The particle velocities are calculated by analyzing the frequency components of the detected scattered light, and a particle velocity distribution or a distribution of the electrophoretic mobilities of those particles can be obtained (see Patent Documents 1 to 3 listed below).

[0003] In an electrophoretic mobility measurement apparatus, a sample in which a dispersion of particles to be measured is suspended is placed in a cell with transparent walls. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2021-169982 [Patent Document 2] Japanese Patent Application Publication No. 05-312757 [Patent Document 3] Japanese Patent Application Publication No. 10-104188 Summary of the Invention [Problem to be solved by the invention]

[0005] When measuring the zeta potential of the surface of a solid flat sample, both a solid sample and a liquid sample are used. A zeta potential measurement jig set is used to fix the relative positions of the cell containing the solid sample and the liquid sample and the electrophoretic mobility measurement device. If the liquid sample leaks from the zeta potential measurement jig set, it may contaminate or damage the electrophoretic mobility measurement device. Conventionally, zeta potential measurement jigs have a structure in which multiple components are fastened together by a locking part. When replacing the solid sample, if the locking part is loosened, the liquid sample leaks out between the components (problem 1).

[0006] Furthermore, the zeta potential measurement jig set has an anode plate and a cathode plate to apply an electric field to the sample. When plating the anode plate and the cathode plate, it is necessary to remove the anode plate and the cathode plate from the zeta potential measurement jig set, plate the removed anode plate and the cathode plate, and then place the anode plate and the cathode plate back into the zeta potential measurement jig set, which is a cumbersome process (the second problem).

[0007] The present disclosure has been made in consideration of the above-mentioned situation, and its first objective is to provide a zeta potential measurement jig set that allows for simple replacement of solid samples without causing liquid samples to leak between the components.

[0008] A second object is to provide a zeta potential measurement jig set that allows plating of an anode plate and a cathode plate with simple operations. [Means for solving the problem]

[0009] In order to solve the first problem, a zeta potential measurement jig set according to one aspect of the present disclosure is a zeta potential measurement jig set used for electrophoretic mobility measurement, comprising a frame and a measurement jig fixed to the frame, wherein the frame has openings at corresponding positions through which irradiated light to a sample and scattered light obtained by scattering the irradiated light by the sample pass, and the frame has first and second holding walls arranged opposite each other, a bottom wall connecting the lower ends of the first and second holding walls and having an anode plate and a cathode plate, and an arm-shaped first locking portion, the measurement jig has anode hole portion and cathode hole portion in the bottom where the anode plate and the cathode plate are located, a lower block arranged on the bottom wall, and a recess in which the sample is placed, a cell that is disposed on the lower block and that has cell communication holes in the bottom surface of the recess that communicate with the anode hole and the cathode hole, respectively, and is made of a material that transmits the irradiated light and the scattered light; a middle block that has a frame-like shape that surrounds the recess in a plan view and is disposed above the cell; an upper member that is disposed on the middle block and closes the upper surface of the recess; and a second locking part that presses the upper member toward the bottom wall, thereby integrating the frame, the lower block, the cell, the middle block, and the upper member, wherein the first locking part elastically presses the middle block toward the bottom wall, thereby integrating the frame, the lower block, the cell, and the middle block.

[0010] In order to solve the second problem, a zeta potential measurement jig set according to another aspect of the present disclosure is a zeta potential measurement jig set used for electrophoretic mobility measurement, comprising a frame, a measurement jig fixed to the frame, and a plating jig fixed to the frame, wherein the frame has openings at corresponding positions through which irradiated light to a sample and scattered light obtained by scattering the irradiated light by the sample pass, and comprises a first holding wall and a second holding wall arranged opposite each other, a bottom wall connecting lower ends of the first holding wall and the second holding wall and having an anode plate and a cathode plate, and a platen having one end having a fitting portion and the other end being rotatable between a locked position and an unlocked position. and an arm-shaped first locking portion pivotally supported on the ends of the first retaining wall and the second retaining wall, the measuring jig having a cell having a recess in which a sample is placed at a position where the irradiation light is irradiated, and a first fitted portion that elastically fits with the fitting portion when the first locking portion is in the locked position, the plating jig having a plating liquid holder having a recess in which plating liquid for plating the anode plate and the cathode plate is placed, and a second fitted portion that elastically fits with the fitting portion when the first locking portion is in the locked position, and the measuring jig and the plating jig are selectively interchangeable and attached to the frame body. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a zeta potential measurement jig set arranged in an electrophoretic mobility measurement apparatus. [Figure 2] FIG. 2 is a perspective view of a measuring jig fixed to a frame body. [Figure 3] 10A and 10B are three-view diagrams of a measuring jig fixed to a frame body. [Figure 4] FIG. 2 is a cross-sectional view of a measuring jig fixed to a frame. [Figure 5] FIG. [Figure 6] FIG. 2 is a three-view diagram of a measuring jig. [Figure 7] 10A and 10B are diagrams illustrating the open and closed states of the second locking portion. [Figure 8]10A and 10B are diagrams illustrating the open and closed states of a first locking portion. [Figure 9] FIG. 2 is a perspective view of a plating jig fixed to a frame. [Figure 10] 1 is a three-view diagram of a plating jig fixed to a frame body. FIG. [Figure 11] FIG. 2 is a cross-sectional view of a plating jig fixed to a frame. [Figure 12] FIG. 2 is a three-view diagram of a plating jig. [Figure 13] 1 is a three-view diagram of a plating liquid holder included in a plating jig. FIG. [Figure 14] 10A and 10B are three-view drawings of a lid included in the plating jig. [Figure 15] 1 is a flowchart showing a plating method and a zeta potential measurement method. DETAILED DESCRIPTION OF THE INVENTION

[0012] Each embodiment of the present disclosure will be described below with reference to the drawings.

[0013] [First embodiment] Zeta potential measurement jig set 100 is used for electrophoretic mobility measurement. Specifically, zeta potential measurement jig set 100 is placed in electrophoretic mobility measurement device 102 shown in FIG. 1 , and zeta potential measurement is performed. A cell 304 (described below) in which a sample is placed is placed inside zeta potential measurement jig set 100, and electrophoretic mobility measurement device 102 applies an electric field to the sample placed in cell 304 via an anode plate 210 and a cathode plate 212 (described below). Openings 220 are formed in first retaining wall 204 and second retaining wall 206, and electrophoretic mobility measurement device 102 irradiates measurement light from one of openings 220. Then, electrophoretic mobility measurement device 102 measures the zeta potential based on scattered light emitted from the other opening 220.

[0014] Each component of the zeta potential measurement jig set 100 according to the first embodiment will be described below with reference to FIGS. 2 to 8. FIG. 2 is a perspective view of the zeta potential measurement jig set 100 in which the measurement jig 300 is fixed to the frame 200. FIG. 3 is a three-view diagram of the zeta potential measurement jig set 100 in which the measurement jig 300 is fixed to the frame 200. FIG. 4 is a cross-sectional view of the zeta potential measurement jig set 100 in which the measurement jig 300 is fixed to the frame 200. FIG. 5 is a three-view diagram illustrating only the frame 200 among the components included in the zeta potential measurement jig set 100. FIG. 6 is a three-view diagram illustrating only the measurement jig 300 among the components included in the zeta potential measurement jig set 100. FIG. 7 is a diagram illustrating the second locking portion 312 in the locked and unlocked states. FIG. 8 is a diagram illustrating the first locking portion 208 in the locked and unlocked states.

[0015] 2, the zeta potential measurement jig set 100 according to the first embodiment includes a frame 200 and a measurement jig 300 fixed to the frame 200. The frame 200 also includes a bottom wall 202, a first retaining wall 204, a second retaining wall 206, and a first locking portion 208.

[0016] The bottom wall 202 connects the lower ends of the first retaining wall 204 and the second retaining wall 206 and has an anode plate 210 and a cathode plate 212. Specifically, the bottom wall 202 is located at the lower ends of the first retaining wall 204 and the second retaining wall 206 and fixes the relative positions of the first retaining wall 204 and the second retaining wall 206. The anode plate 210 and the cathode plate 212 are disposed on the bottom wall 202. One of the anode plate 210 and the cathode plate 212 is electrically connected to a terminal to which a predetermined voltage is applied from the electrophoretic mobility measurement device 102 via a conductive plate extending in the x-axis direction. The other is electrically connected to a terminal to which a predetermined voltage is applied from the electrophoretic mobility measurement device 102 via a conductive plate extending in the -x-axis direction. A voltage higher than that applied to the cathode plate 212 from the electrophoretic mobility measurement device 102 is applied to the anode plate 210.

[0017] The first retaining wall 204 and the second retaining wall 206 are disposed opposite each other and have corresponding openings 220 through which the irradiated light to the sample and the scattered light resulting from scattering of the irradiated light by the sample pass. Specifically, as shown in FIGS. 2 to 5 , the first retaining wall 204 and the second retaining wall 206 each have a plate-like portion that has a wide surface in the xz plane and is thin in the y-axis direction, and a handle portion 214 at the top (z-axis direction). The first retaining wall 204 and the second retaining wall 206 are disposed such that the xz planes of the plate-like portions face each other. The plate-like portions have corresponding openings 220 that penetrate in the y-axis direction. One of the openings 220 allows the light to be irradiated to the sample to pass through, and the other of the openings 220 allows the light scattered by the sample to pass through. The plate-like portion and the handle portion 214 may be formed integrally.

[0018] Furthermore, the first retaining wall 204 and the second retaining wall 206 each have an engagement hole 216 with which an end of the second locking portion 312 engages. Specifically, each handle portion 214 of the first retaining wall 204 and the second retaining wall 206 has an engagement hole 216 at a position corresponding to the second locking portion 312. The engagement hole 216 is provided on the opposing surfaces of the first retaining wall 204 and the second retaining wall 206, and the tip end of the second locking portion 312 in the longitudinal direction is fitted into the engagement hole 216. The engagement hole 216 has an area that comes into contact with the upper surface of the second locking portion 312 when the longitudinal direction of the second locking portion 312 is positioned in the direction in which the first retaining wall 204 and the second retaining wall 206 face each other.

[0019] 2 to 8 illustrate the case where the bottom wall 202, the first retaining wall 204, and the second retaining wall 206 of the frame 200 are integrally formed. However, the bottom wall 202, the first retaining wall 204, and the second retaining wall 206 may be formed separately, and each part may be fixed using screws or the like.

[0020] The first locking portion 208 is arm-shaped. For example, the first locking portion 208 is an arm having one end which has a fitting portion 218 that, when in the locked position, elastically fits with a first fitted portion 340 provided on the upper surface of the middle block 306, and the other end which is pivotally supported on the ends of the first retaining wall 204 and the second retaining wall 206 so as to be rotatable between the locked position and the unlocked position.

[0021] Specifically, as shown in FIGS. 3 and 5 , one first locking portion 208 is provided at each end of the first retaining wall 204 and the second retaining wall 206 in the x-axis direction. When viewed in the xz plane, the first locking portion 208 has an elongated portion pivotally supported by the first retaining wall 204 and an elongated portion pivotally supported by the second retaining wall 206. As shown in the side view of the yz plane, the first locking portion 208 also has a portion connecting the two elongated portions. The first locking portion 208 has a fitting portion 218 at one end of the elongated portion (portion shown in the xz plane) that fits with a first fitted portion 340 (described below) provided on the top surface of the middle block 306 when in the locked position. The fitting portion 218 is, for example, cylindrical, but may have other shapes.

[0022] The fitting portion 218 is formed of, for example, resin, and elastically fits with a first fitted portion 340 provided on the upper surface of the middle block 306. The other end of the elongated portion (portion shown in the xz plane) of the first locking portion 208 is pivotally supported by the ends of the first retaining wall 204 and the second retaining wall 206. This allows the first locking portion 208 to rotate around the y-axis. The state shown in FIG. 8(a) is the locked state, and the state shown in FIG. 8(b) is the unlocked state. When the first locking portion 208 is in the locked state, the first locking portion 208 elastically presses the middle block 306 toward the bottom wall 202, thereby integrating the frame body 200, the lower block 302, the cell 304, and the middle block 306.

[0023] Although each figure illustrates the case where the first locking portion 208 is pivotally supported by the first retaining wall 204 and the second retaining wall 206, the first locking portion 208 may also be pivotally supported by the bottom wall 202.

[0024] The measuring jig 300 includes a lower block 302 , a cell 304 , a middle block 306 , an upper member, and a second locking portion 312 .

[0025] The lower block 302 has an anode hole 314 and a cathode hole 316 in which the anode plate 210 and the cathode plate 212 are located at the bottom, and is disposed on the bottom wall 202. Specifically, for example, the lower block 302 has a space inside in which the cell 304 is disposed, and the anode hole 314 and the cathode hole 316 are disposed below this space. The anode hole 314 and the cathode hole 316 are provided at positions corresponding to the anode plate 210 and the cathode plate 212 on the bottom wall 202. The anode hole 314 and the cathode hole 316 are spaces into which a liquid sample is disposed via a supply path 318.

[0026] The lower block 302 has a first seal 320 on its surface in contact with the bottom wall 202 that surrounds the anode hole 314 and the cathode hole 316, and a second seal 322 on its surface in contact with the cell 304 that surrounds the anode hole 314 and the cathode hole 316. Specifically, the first seal 320 is an O-ring that surrounds the anode hole 314 and the cathode hole 316 and is provided on the surface of the lower block 302 that contacts the bottom wall 202. When at least one of the first locking portion 208 and the second locking portion presses the lower block 302 toward the bottom wall 202, the first seal 320 prevents leakage of the liquid sample between the lower block 302 and the bottom wall 202. The second seal 322 is an O-ring that surrounds the periphery of the anode hole 314 and the cathode hole 316 provided on the surface of the lower block 302 that contacts the cell 304. When at least one of the first locking portion 208 and the second locking portion presses the cell 304 toward the bottom wall 202, the first seal 320 prevents the liquid sample from leaking between the cell 304 and the lower block 302.

[0027] The lower block 302 has a liquid sample supply knob 324 and a supply channel 318 for supplying a liquid sample to the anode hole 314 and the cathode hole 316. Specifically, as shown in FIG. 4 , the lower block 302 has a space (supply channel 318) that connects the side surfaces of the anode hole 314 and the cathode hole 316 to the location where the liquid sample supply knob 324 is located. The liquid sample supply knob 324 is configured to be detachable from other parts, and a liquid sample can be supplied to the anode hole 314 and the cathode hole 316 via the supply channel 318. This allows the liquid sample to be easily removed and supplied without removing the solid sample from the zeta potential measurement jig set 100.

[0028] The cell 304 has a recess in which a sample is placed and cell communication holes 326 at the bottom of the recess that communicate with the anode hole 314 and the cathode hole 316, respectively. The cell 304 is made of a material that transmits irradiated light and scattered light and is placed on the lower block 302. Specifically, for example, the cell 304 is made of transparent glass. As shown in FIG. 4 , the cell 304 has a flat recess on its upper surface in which a sample is placed. The cell 304 also has a cell communication hole 326 at the bottom of the recess that penetrates to the anode hole 314 and a cell communication hole 326 that penetrates to the cathode hole 316. During measurement, the recess and the cell communication hole 326 are filled with a solid sample and a liquid sample. The recess is located to the side of the opening 220 in the first retaining wall 204 and the second retaining wall 206 and functions as a measurement space. This allows light to be irradiated onto the sample placed in the measurement space.

[0029] The middle block 306 has a frame-like shape that surrounds the recesses in a plan view, and is disposed above the cell 304. Specifically, for example, the middle block 306 is a frame-like member that is disposed above the cell 304. The middle block 306 has a hole at a position where all of the recesses provided in the cell 304 can be seen when viewed from above while disposed above the cell 304. The hole is shaped to surround the side of the cell upper surface pressing portion 332. Furthermore, since the hole is smaller than the outer edge of the cell 304, the middle block 306 has an area that overlaps with the cell 304.

[0030] The middle block 306 has a first fitted portion 340 that elastically fits with the fitting portion 218 when the end of the first locking portion 208 is in the locked position. Specifically, for example, the middle block 306 has a recess (first fitted portion 340) shaped along the cylindrical fitting portion 218 on the upper surface near both ends in the x-axis direction. When the end of the first locking portion 208 is in the locked position, the cylindrical fitting portion 218 elastically fits with the first fitted portion 340.

[0031] Note that as long as at least one of the first fitted portion 340 and the fitting portion 218 has elasticity, the other may be formed of a rigid material. For example, when the fitting portion 218 is formed of an elastic resin such as rubber, the first fitted portion 340 may be formed of a rigid material such as metal. Conversely, when the first fitted portion 340 is formed of an elastic resin such as rubber, the fitting portion 218 may be formed of a rigid material such as metal. Furthermore, both the fitting portion 218 and the first fitted portion 340 may be formed of an elastic resin such as rubber.

[0032] The middle block 306 has a third seal 328 on its surface that contacts the cell 304, which surrounds the recess, and a fourth seal 330 on its surface that contacts the upper member. Specifically, the third seal 328 is, for example, an O-ring provided on the surface of the middle block 306 that contacts the cell 304, in the area where the middle block 306 and the cell 304 overlap. That is, the third seal 328 is an O-ring that surrounds the recess of the cell 304. When at least one of the first locking unit 208 and the second locking unit 208 is in the locked state, the third seal 328 prevents sample leakage between the middle block 306 and the cell 304. The fourth seal 330 is an O-ring provided on the surface of the middle block 306 that contacts the upper block 334. The fourth seal 330 is shaped to surround the hole of the frame-shaped middle block 306 and is provided in the area that contacts the upper block 334 included in the upper member. The fourth seal 330 seals the gap between the upper block 334 and the middle block 306 when the second locking portion 312 presses the upper block 334 toward the bottom wall 202. In other words, when the second locking portion 312 is not pressing the upper block 334 toward the bottom wall 202, the fourth seal 330 does not seal the gap between the upper block 334 and the middle block 306 even if the first locking portion 208 is in the locked state.

[0033] The upper member is a member that is placed on the middle block 306 and closes the upper surface of the recessed portion. The upper member has a cell upper surface pressing portion 332, an upper block 334, and a pressing portion.

[0034] The cell upper surface pressing portion 332 is disposed on the cell 304 and presses the upper surface of the cell 304 toward the bottom wall 202. Specifically, for example, as shown in FIG. 4, the cell upper surface pressing portion 332 has a shape that follows the inner wall of the hole of the frame-shaped middle block 306 and is disposed in contact with the upper surface of the cell 304. The surface of the cell upper surface pressing portion 332 that comes into contact with the cell 304 is formed flat. The cell upper surface pressing portion 332 is pressed toward the cell 304 by the pressing portion.

[0035] The upper block 334 is disposed above the middle block 306 and presses the middle block 306 and the fourth seal 330 provided on the middle block 306 toward the bottom wall 202. Specifically, the upper block 334 is disposed above the cell upper surface pressing portion 332 and the middle block 306. The upper side of the upper block 334 contacts the second locking portion 312. As will be described later, the second locking portion 312 rotates, thereby pressing the upper block 334 toward the bottom wall 202. As a result, the upper block 334 presses the middle block 306 and the fourth seal 330 provided on the middle block 306 toward the bottom wall 202.

[0036] Additionally, the upper block 334 has a through-hole that penetrates in the vertical direction above the cell 304. A pressing part is disposed in the through-hole. Because the side wall of the through-hole is not threaded, the pressing part can press the through-hole toward the bottom wall 202, in addition to the pressure that the second locking part 312 applies to the cell top surface pressing part 332.

[0037] The pressing portion is disposed in the through hole and presses the cell upper surface pressing portion 332 against the cell 304. Specifically, for example, the pressing portion includes a cylindrical shaft portion 336 disposed in the through hole, a knob portion 338 provided above the shaft portion 336 (in the z-axis direction), and a block-shaped member provided below the shaft portion 336 (in the -z-axis direction). The knob portion 338 and the shaft portion 336 are fixed, and by rotating the knob portion 338 in a plane parallel to the bottom wall 202 (in the xy plane), the cylindrical shaft portion 336 rotates around the axis of the cylinder. The block-shaped member has a hole on the upper side that fits with the shaft portion 336, and the wall surface of the hole is threaded. As the shaft portion 336 rotates, the block-shaped member is pressed downward (toward the cell 304) by the shaft portion 336 fitted in the hole.

[0038] The second locking portion 312 presses the upper member toward the bottom wall 202, integrating the frame body 200, the lower block 302, the cells 304, the middle block 306, and the upper member. Specifically, for example, the second locking portion 312 has a shape that has a major axis direction and a minor axis direction and whose thickness varies from the center to the end. The second locking portion 312 has a substantially elliptical shape that has a major axis direction and a minor axis direction, and the upper surface is sloped so that the height in the z-axis direction decreases toward the tip. The second locking portion 312 is disposed on the upper block 334.

[0039] The second locking portion 312 is rotatable in the plane of the bottom wall 202, and presses the upper member toward the bottom wall 202 by engaging its end with the engagement hole 216. Specifically, for example, the second locking portion 312 is rotatable within the xy plane, and as shown in FIG. 7( a), when the major axis of the second locking portion 312 is rotated 60 degrees counterclockwise, the second locking portion 312 does not fit into the engagement hole 216 provided in the handle portion 214. When the second locking portion 312 is not engaged with the engagement holes 216 of the first retaining wall 204 and the second retaining wall 206, the second locking portion 312 is in an unlocked state.

[0040] On the other hand, as shown in FIG. 7( b), when the major axis of the second locking portion 312 is parallel to the y-axis, the second locking portion 312 fits into the engagement hole 216 provided in the handle portion 214. When the second locking portion 312 is engaged with the engagement holes 216 of the first retaining wall 204 and the second retaining wall 206, the second locking portion 312 is in a locked state. When the second locking portion 312 fits into the engagement hole 216, the inclination provided on the upper surface of the second locking portion 312 presses the upper block 334, which is disposed below the second locking portion 312, toward the bottom wall 202. As a result, the second locking portion 312 presses the upper member toward the bottom wall 202, thereby integrating the frame body 200, the lower block 302, the cell 304, the middle block 306, and the upper member. When the handle portion 214 is configured to have a visor shape instead of the engagement hole 216, the lower surface of the visor comes into contact with the upper surface of the second locking portion 312.

[0041] As described above, in the zeta potential measurement jig set 100 according to the first embodiment, the first locking unit 208 presses the middle block 306 toward the bottom wall 202, integrating the frame 200, the lower block 302, the cell 304, and the middle block 306. The second locking unit 312 presses the upper member toward the bottom wall 202, integrating the frame 200, the lower block 302, the cell 304, the middle block 306, and the upper member. The upper member can be removed by loosening the second locking unit 312 while the first locking unit 208 remains locked. This allows the solid sample placed in the recess of the cell 304 to be easily replaced without causing the liquid sample to leak between the bottom wall 202, the lower block 302, the cell 304, and the middle block 306, and without removing the liquid sample.

[0042] [Second embodiment] Next, a zeta potential measurement jig set 100 according to a second embodiment will be described. The zeta potential measurement jig set 100 according to the second embodiment is used for electrophoretic mobility measurement, and includes a frame 200, a measurement jig 300 fixed to the frame 200, and a plating jig 400 fixed to the frame 200.

[0043] The measuring jig 300 and the plating jig 400 are selectively interchangeably mounted on the frame 200. Specifically, when plating the anode plate 210 and the cathode plate 212 of the frame 200, the plating jig 400 is mounted on the frame 200 and fixed to the frame 200 by the first locking portion 208. The plating jig 400 fixed to the frame 200 is then placed in the electrophoretic mobility measurement apparatus 102 shown in FIG. 1 , where plating is performed. On the other hand, when electrophoretic mobility measurement is performed, the measuring jig 300 is mounted on the frame 200 and fixed to the frame 200 by the first locking portion 208. The measuring jig 300 fixed to the frame 200 is then placed in the electrophoretic mobility measurement apparatus 102 shown in FIG. 1 , where zeta potential measurement is performed. The plating method and the method for measuring the zeta potential will be described later.

[0044] Each component of the zeta potential measurement jig set 100 according to the second embodiment will be described below with reference to FIGS. 9 to 14. FIG. 9 is a perspective view of the zeta potential measurement jig set 100 in which a plating jig 400 is fixed to a frame 200. FIG. 10 is a three-view diagram of the zeta potential measurement jig set 100 in which a plating jig 400 is fixed to a frame 200. FIG. 11 is a cross-sectional view of the zeta potential measurement jig set 100 in which a plating jig 400 is fixed to a frame 200. FIG. 12 is a three-view diagram illustrating only the plating jig 400 among the components included in the zeta potential measurement jig set 100. FIG. 13 is a three-view diagram illustrating only the plating solution holder 402 among the components included in the plating jig 400. FIG. 14 is a three-view diagram illustrating only the lid 404 among the components included in the plating jig 400. Only in FIG. 14, a bottom view is shown instead of a top view.

[0045] The frame 200 is similar to the frame 200 in the first embodiment. That is, as shown in FIG. 5 , the frame 200 has a first retaining wall 204, a second retaining wall 206, a bottom wall 202, and a first locking portion 208. The first retaining wall 204 and the second retaining wall 206 have openings 220 at corresponding positions through which the irradiated light to the sample and the scattered light from the sample pass. The first retaining wall 204 and the second retaining wall 206 are disposed opposite each other. The first retaining wall 204 and the second retaining wall 206 each have an engagement hole 216 with which the end of the second locking portion 312 engages. The bottom wall 202 connects the lower ends of the first retaining wall 204 and the second retaining wall 206 and has an anode plate 210 and a cathode plate 212. The first locking portion 208 is arm-shaped. The first locking portion 208 has a fitting portion 218 at one end, and the other end is pivotally supported on the ends of the first retaining wall 204 and the second retaining wall 206 so as to be rotatable between a locked position and an unlocked position. When the other end of the first locking portion 208 is in the locked position, the first locking portion 208 elastically presses the middle block 306 toward the bottom wall 202, thereby integrating the frame body 200, the lower block 302, the cell 304, and the middle block 306.

[0046] The measuring jig 300 is fixed to the frame 200 and is used for measuring the zeta potential. Here, a case where the measuring jig 300 is the same as the measuring jig 300 in the first embodiment will be described, but it may be different. When the measuring jig 300 is the same as the measuring jig 300 in the first embodiment, the measuring jig 300 has a lower block 302, a cell 304, a middle block 306, an upper member, and a second locking portion 312.

[0047] The lower block 302 has an anode hole 314 and a cathode hole 316 in which the anode plate 210 and the cathode plate 212 are located at the bottom, and is disposed on the bottom wall 202. The lower block 302 has a first seal 320 that surrounds the periphery of the anode hole 314 and the cathode hole 316 on the surface that contacts the bottom wall 202, and a second seal 322 that surrounds the periphery of the anode hole 314 and the cathode hole 316 on the surface that contacts the cell 304. The lower block 302 has a supply channel 318 that supplies a sample to the anode hole 314 and the cathode hole 316.

[0048] The cell 304 has a recess where a sample is placed at a position where the sample is irradiated with the irradiation light. The cell 304 has a recess where the sample is placed and cell communication holes 326 at the bottom of the recess that communicate with the anode hole 314 and the cathode hole 316, respectively. The cell 304 is made of a material that transmits the irradiation light and scattered light, and is placed on the lower block 302.

[0049] The middle block 306 has a frame-like shape that surrounds the recess in a plan view, and is disposed above the cell 304. The middle block 306 has a third seal 328 that surrounds the recess on the surface that contacts the cell 304, and a fourth seal 330 that follows the outer periphery of the middle block 306 on the surface that contacts the upper member. The middle block 306 has a first fitted portion 340 that elastically fits with the fitting portion 218 when the end of the first locking portion 208 is in the locked position. The first fitted portion 340 elastically fits with the fitting portion 218 when the first locking portion 208 is in the locked position.

[0050] The upper member is disposed on the middle block 306 and closes the upper surface of the recess, and includes a cell upper surface pressing portion 332, an upper block 334, and a pressing portion. The cell upper surface pressing portion 332 is disposed on the cell 304 and presses the upper surface of the cell 304 toward the bottom wall 202. The pressing portion is disposed in the through hole and presses the cell upper surface pressing portion 332 against the cell 304. The upper block 334 is disposed above the middle block 306 and presses the middle block 306 and the fourth seal 330 provided on the middle block 306 toward the bottom wall 202. The upper block 334 has a through hole that passes through in the vertical direction above the cell 304.

[0051] The second locking portion 312 presses the upper member toward the bottom wall 202, integrating the frame 200, the lower block 302, the cells 304, the middle block 306, and the upper member. The second locking portion 312 has a long axis direction and a short axis direction, and has a shape whose thickness varies from the center to the ends. The second locking portion 312 is rotatable in the plane of the bottom wall 202, and presses the upper member toward the bottom wall 202 by engaging its ends with the engagement holes 216.

[0052] In the second embodiment, the first locking portion 208 only needs to fix the measuring jig 300 to the frame 200, and does not need to have the function of integrating the middle block 306, the cell 304, and the lower block 302. Therefore, the measuring jig 300 may differ from that of the first embodiment as long as it has at least the cell 304 in which a sample is placed and the first fitted portion 340 that elastically fits with the fitting portion 218 when the end of the first locking portion 208 is in the locked position. For example, the lower block 302 and the middle block 306 may be configured as an integrated unit.

[0053] 12 to 14, the plating jig 400 includes a plating liquid holder 402 and a lid 404. The plating liquid holder 402 includes a recess, a plating liquid communication hole 406, and a second fitted portion 408.

[0054] Specifically, the plating solution holder 402 is a member that is disposed on the bottom wall 202, between the first retaining wall 204 and the second retaining wall 206. The plating solution holder 402 has a planar shape whose length in the x-axis direction is approximately the same as that of the bottom wall 202 and whose length in the y-axis direction is approximately the same as the distance between the first retaining wall 204 and the second retaining wall 206, so that the plating solution holder 402 can be fixed by the first locking portion 208 when disposed in the frame 200.

[0055] The plating liquid holder 402 also has second fitted portions 408 that elastically fit with the fitting portions 218 when the first locking portion 208 is in the locked position. Specifically, for example, the second fitted portions 408 are provided in two locations near both ends in the x-axis direction on the top surface of the plating liquid holder 402. The shape of the second fitted portions 408 is the same as the shape of the first fitted portion 340 provided in the middle block 306, and is a recess shaped along the cylindrical fitting portion 218. The second fitted portions 408 are also provided at positions where the height of the second fitted portions 408 when the plating liquid holder 402 is fixed to the frame 200 is the same as the height of the first fitted portion 340 when the measuring jig 300 is fixed to the frame 200. As a result, even when the plating solution holder 402 is attached to the frame 200 that secures the measuring jig 300, when the end of the first locking portion 208 is in the locked position, the cylindrical fitting portion 218 elastically fits into the second fitted portion 408. In other words, the frame 200 can be used both during measurement and during plating processing.

[0056] The plating liquid holder 402 is provided with a space for holding the plating liquid. Specifically, for example, as shown in Fig. 13, the plating liquid holder 402 has a recess on its upper surface in which the plating liquid for plating the anode plate 210 and the cathode plate 212 is placed. Furthermore, the plating liquid holder 402 has plating liquid communication holes 406 in the bottom surface of the recess in which the plating liquid is placed, which communicate with the anode hole 314 and the cathode hole 316, respectively. When the plating liquid is poured into the recess, the plating liquid comes into contact with the anode plate 210 and the cathode plate 212 through the plating liquid communication holes 406.

[0057] The lid 404 fits into the recess in which the plating liquid is placed and covers the upper surface of the recess. Specifically, for example, as shown in FIG. 14 , the lid 404 has a protrusion on its bottom surface that fits into the recess in the plating liquid holder 402 and a block-shaped grip on its top surface. The protrusion has a fifth seal 410 that surrounds the periphery to prevent the plating liquid from leaking out when the lid 404 is fitted into the plating liquid holder 402. The fifth seal 410 is, for example, an O-ring. The lid 404 may have any shape as long as it can seal the plating liquid so as not to leak out, and is not limited to the shape shown in the figure.

[0058] The lid 404 also has pressure relief holes 412 that connect the top surface to the recessed portion where the plating liquid is placed. Specifically, the lid 404 has pressure relief holes 412 that connect the bottom surface to the top surface in two locations in the area (top of the convex portion) surrounded by the fifth seal 410 on the bottom surface. By fitting the lid 404 to the plating liquid holder 402, it is possible to prevent dangerous plating liquid from splashing when performing work related to the plating process. Also, air bubbles may be generated from the plating liquid during the plating process. In such cases, the pressure relief holes 412 allow the air bubbles to escape, increasing the air pressure in the space holding the plating liquid and preventing the lid 404 from being blown off.

[0059] Next, a plating method and a zeta potential measurement method using the zeta potential measurement jig set 100 according to the second embodiment will be described with reference to the flowchart shown in Fig. 15. Below, a case where platinum black plating is performed as the plating method will be described. Furthermore, when the anode plate 210 and the cathode plate 212 are platinum black plated, it is not preferable to store the anode plate 210 and the cathode plate 212 in a state where they are exposed to the air. Therefore, the anode plate 210 and the cathode plate 212 are stored separately from the bottom wall 202.

[0060] First, the anode plate 210 and the cathode plate 212 are placed on the bottom wall 202 (S1502). Specifically, the anode plate 210 and the cathode plate 212 are placed at a location on the bottom wall 202 where a voltage is applied. Next, if plating is to be performed, the process proceeds to S1506; if plating is not to be performed, the process proceeds to S1526 (S1504). The platinum black-plated anode plate 210 and cathode plate 212 can be used approximately 10 to 20 times after one plating process. If measurements are repeated, the platinum black plating will peel off or deteriorate, so it will be necessary to perform the plating process again every time a predetermined number of measurements are performed. Here, we will explain the situation in which plating becomes necessary.

[0061] Next, the plating solution holder 402 is placed on the frame 200, and the plating solution holder 402 is fixed to the frame 200 by the first locking portion 208 (S1606). Then, a plating solution for platinum black plating is poured into the recess provided in the plating solution holder 402, and the lid 404 is placed (S1508). For example, an aqueous solution of hexachloroplatinic acid and lead acetate is poured into the recess provided in the plating solution holder 402, and the lid 404 is placed.

[0062] Next, the zeta potential measurement jig set 100, which is composed of the plating jig 400 containing the plating solution sealed therein in S1508 and the frame 200, is placed in the electrophoretic mobility measurement apparatus 102 (S1510). Then, using the electrophoretic mobility measurement apparatus 102, a voltage is applied to the anode plate 210 and the cathode plate 212 for a predetermined time, thereby performing a platinum black plating process (S1512). After the platinum black plating process is completed, the zeta potential measurement jig set 100 is removed from the electrophoretic mobility measurement apparatus 102 (S1514).

[0063] Next, the lid 404 is removed from the removed plating jig 400, and the plating solution is removed (S1516). Then, with the plating holder fixed to the frame 200, a cleaning solution is poured into the recess of the plating holder, and the lid 404 is placed (S1518). The cleaning solution is, for example, sulfuric acid.

[0064] Next, the zeta potential measurement jig set 100, which includes the plating jig 400 and the frame 200 in which the cleaning solution has been sealed in S1518, is placed in the electrophoretic mobility measurement apparatus 102 (S1520). Then, using the electrophoretic mobility measurement apparatus 102, a voltage is applied to the anode plate 210 and the cathode plate 212 for a predetermined time, thereby cleaning the anode plate 210 and the cathode plate 212. After the cleaning process is completed, the zeta potential measurement jig set 100 is removed from the electrophoretic mobility measurement apparatus 102 (S1522). Furthermore, the cleaning solution is removed from the plating solution holder 402, and the plating solution holder 402 is removed from the frame 200 (S1524). Steps S1506 to S1524 complete the plating process.

[0065] If plating is not required in S1504 or if plating is completed in S1524, the lower block 302 is placed on the frame 200 for measurement (S1526). Next, the cell 304 is placed on the lower block 302 relative to the frame 200 (S1528). Furthermore, the middle block 306 is placed on the frame 200 (S1530). Then, the first locking portion 208 is placed in the locked state (S1532). Here, the first fitted portion 340 and the second fitted portion 408 are arranged so that the position of the second fitted portion 408 when the plating solution holder 402 is fixed to the frame 200 is the same as the position of the first fitted portion 340 when the measuring jig 300 is fixed to the frame 200. Therefore, not only the plating jig 400 but also the measuring jig 300 can be fixed to the common frame 200. By setting the first locking portion 208 in the locked state, the first locking portion 208 elastically presses the middle block 306 toward the bottom wall 202, thereby integrating the frame body 200, the lower block 302, the cell 304, and the middle block 306.

[0066] Next, a sample is placed (S1534). In the state of S1532, the top surface of the cell 304 is not covered by the upper member, so a solid sample can be placed in the recess provided in the top surface of the cell 304. After the sample is placed, the upper member and second locking part 312 are placed (S1536). Furthermore, the second locking part 312 is rotated to set the second locking part 312 in a locked state. By setting the second locking part 312 in a locked state, the second locking part 312 presses the upper member toward the bottom wall 202 (S1538). Then, the liquid sample supply knob 324 is removed, and the liquid sample is supplied to each of the anode hole 314 and the cathode hole 316 via the supply path 318 (S1540).

[0067] Next, the zeta potential measurement jig set 100, which includes the measurement jig 300 on which the sample has been placed in the steps up to S1540 and the frame 200, is placed in the electrophoretic mobility measurement apparatus 102 (S1542). Then, using the electrophoretic mobility measurement apparatus 102, a voltage is applied to the anode plate 210 and the cathode plate 212 for a predetermined time, thereby performing measurement (S1544). When the measurement is completed, the zeta potential measurement jig set 100 is removed from the electrophoretic mobility measurement apparatus 102.

[0068] The plating process and measurement are completed through the above steps. As described above, not only the plating jig 400 but also the measuring jig 300 can be fixed to the common frame 200. Therefore, when performing measurement after the plating process, there is no need to remove or reposition the electrodes, which simplifies the process. Furthermore, since there is no need to remove or reposition the electrodes, the risk of them coming into contact with tweezers or the like and peeling off after the plating process is reduced. [Explanation of symbols]

[0069] 100 Zeta potential measurement jig set, 102 Electrophoretic mobility measurement apparatus, 200 Frame, 202 Bottom wall, 204 First holding wall, 206 Second holding wall, 208 First locking portion, 210 Anode plate, 212 Cathode plate, 214 Handle portion, 216 Engagement hole, 218 Fitting portion, 220 Opening, 300 Measurement jig, 302 Lower block, 304 Cell, 306 Middle block, 312 Second locking portion, 314 Anode hole portion, 316 Cathode hole portion, 318 Supply channel, 320 First seal, 322 Second seal, 324 Liquid sample supply knob, 326 Cell communication hole, 328 Third seal, 330 Fourth seal, 332 Cell top surface pressing portion, 334 Upper block, 336 Shaft portion, 338 knob portion, 340 first mating portion, 400 plating jig, 402 plating liquid holder, 404 lid, 406 plating liquid communication hole, 408 second mating portion, 410 fifth seal, 412 pressure relief hole.

Claims

1. A device for use in electrophoretic mobility measurement, comprising a frame and a measurement jig fixed to the frame. A zeta potential measurement jig set, The frame body is a first holding wall and a second holding wall, which are disposed opposite each other and have openings at corresponding positions through which irradiated light to be irradiated onto the sample and scattered light resulting from scattering of the irradiated light by the sample pass; a bottom wall connecting the lower ends of the first holding wall and the second holding wall and having an anode plate and a cathode plate; an arm-shaped first locking portion; and The measuring jig is a lower block having an anode hole and a cathode hole in a bottom portion in which the anode plate and the cathode plate are positioned, the lower block being disposed on the bottom wall; a cell having a recess in which the sample is placed and cell communication holes in a bottom surface of the recess that communicate with the anode hole and the cathode hole, respectively, the cell being made of a material that transmits the irradiation light and the scattered light, and being placed on the lower block; a middle block having a frame-like shape surrounding the recess in a plan view and disposed above the cell; an upper member disposed on the middle block and closing an upper surface of the recess; a second locking portion that presses the upper member toward the bottom wall and integrates the frame body, the lower block, the cell, the middle block, and the upper member; and the first locking portion elastically presses the middle block toward the bottom wall, and integrates the frame body, the lower block, the cell, and the middle block. A zeta potential measurement jig set characterized by:

2. The lower block is a first seal on a surface in contact with the bottom wall that surrounds the anode hole and the cathode hole; a second seal on a surface in contact with the cell that surrounds the anode hole and the cathode hole; and The middle block is a third seal on a surface in contact with the cell, the third seal surrounding the recess; a fourth seal on a surface that contacts the upper member; The zeta potential measurement jig set according to claim 1, further comprising:

3. The zeta potential measurement jig set according to claim 1 or 2, characterized in that the first locking portion has an engaging portion at one end that elastically engages with a first engaging portion provided on the upper surface of the middle block in the locked position, and the other end is an arm that is pivotally supported on the ends of the first retaining wall and the second retaining wall so as to be rotatable between the locked position and the unlocked position.

4. the second locking portion has a major axis direction and a minor axis direction, and has a shape whose thickness varies from the center to the end portion, the first retaining wall and the second retaining wall each have an engagement hole with which an end of the second locking portion engages; The zeta potential measurement jig set according to claim 1 or 2, characterized in that the second locking portion is rotatable in the in-plane direction of the bottom wall, and its end engages with the engagement hole to press the upper member toward the bottom wall.

5. The upper member is a cell upper surface pressing portion disposed on the cell and pressing the upper surface of the cell toward the bottom wall; an upper block disposed above the middle block and pressing the middle block and the fourth seal provided on the middle block toward the bottom wall; 3. The zeta potential measurement jig set according to claim 2, further comprising:

6. the upper block has a through-hole penetrating in the vertical direction above the cell, the measuring jig further includes a pressing portion that is placed in the through hole and presses the cell upper surface pressing portion against the cell. The zeta potential measurement jig set according to claim 5 .

7. 3. The zeta potential measurement jig set according to claim 1, wherein the lower block has a supply path for supplying the sample to the anode hole and the cathode hole.

8. A zeta potential measurement jig set for use in electrophoretic mobility measurement, comprising: a frame; a measurement jig fixed to the frame; and a plating jig fixed to the frame, The frame body is a first holding wall and a second holding wall, which are disposed opposite each other and have openings at corresponding positions through which irradiated light to be irradiated onto the sample and scattered light resulting from scattering of the irradiated light by the sample pass; a bottom wall connecting the lower ends of the first holding wall and the second holding wall and having an anode plate and a cathode plate; a first locking portion in the form of an arm, one end of which has a fitting portion and the other end of which is pivotally supported on the ends of the first holding wall and the second holding wall so as to be rotatable between a locked position and an unlocked position; and The measuring jig is a cell having a recess in which a sample is placed at a position where the irradiation light is irradiated; a first fitted portion that elastically fits with the fitting portion when the first locking portion is in the lock position; and The plating jig is a recess in which a plating solution for plating the anode plate and the cathode plate is placed; a second fitted portion that is elastically fitted with the fitting portion when the first locking portion is in the lock position; a plating solution holder having The measuring jig and the plating jig are selectively mounted on the frame by exchange. A zeta potential measurement jig set characterized by:

9. The measuring jig is a lower block having an anode hole and a cathode hole in a bottom portion in which the anode plate and the cathode plate are positioned, the lower block being disposed on the bottom wall; a cell having a recess in which the sample is placed and cell communication holes in a bottom surface of the recess that communicate with the anode hole and the cathode hole, respectively, the cell being made of a material that transmits the irradiation light and the scattered light, and being placed on the lower block; a middle block having a frame-like shape surrounding the recess in a plan view and disposed above the cell; an upper member disposed on the middle block and closing an upper surface of the recess; a second locking portion that presses the upper member toward the bottom wall and integrates the frame body, the lower block, the cell, the middle block, and the upper member; having The zeta potential measurement jig set according to claim 8.

10. 10. The zeta potential measurement jig set according to claim 9, wherein the plating liquid holder has plating liquid communication holes in the bottom surface of the recess in which the plating liquid is placed, the plating liquid communication holes communicating with each of the anode hole and the cathode hole.

11. The lower block is a first seal on a surface in contact with the bottom wall that surrounds the anode hole and the cathode hole; a second seal on a surface in contact with the cell that surrounds the anode hole and the cathode hole; and The middle block is a third seal on a surface in contact with the cell, the third seal surrounding the recess; a fourth seal on a surface that contacts the upper member; The zeta potential measurement jig set according to claim 9, further comprising:

12. the first locking portion elastically presses the middle block toward the bottom wall, and integrates the frame body, the lower block, the cell, and the middle block. The zeta potential measurement jig set according to claim 9 .

13. the second locking portion has a major axis direction and a minor axis direction, and has a shape whose thickness varies from the center to the end portion, the first retaining wall and the second retaining wall each have an engagement hole with which an end of the second locking portion engages; The zeta potential measurement jig set described in claim 11, characterized in that the second locking portion is rotatable in the in-plane direction of the bottom wall, and its end engages with the engagement hole to press the upper member toward the bottom wall.

14. The upper member is a cell upper surface pressing portion disposed on the cell and pressing the upper surface of the cell toward the bottom wall; an upper block disposed above the middle block and pressing the middle block and the fourth seal provided on the middle block toward the bottom wall; The zeta potential measurement jig set according to claim 11, further comprising:

15. the upper block has a through-hole penetrating in the vertical direction above the cell, the measuring jig further includes a pressing portion that is placed in the through hole and presses the cell upper surface pressing portion against the cell. The zeta potential measurement jig set according to claim 14.

16. 10. The zeta potential measurement jig set according to claim 9, wherein the lower block has a supply path for supplying the sample to the anode hole and the cathode hole.

17. the plating jig further has a lid that fits into the recess in which the plating liquid is placed and covers the upper surface of the recess; the lid has a pressure relief hole communicating between the recess in which the plating liquid is placed and the upper surface thereof; The zeta potential measurement jig set according to claim 8 or 9.

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