Storage structure of ultra fine bubble liquid, and storage method of ultra fine bubble liquid

Abstract

To provide a storage structure of an ultra fine bubble liquid capable of restraining a decrease in concentration of bubbles.SOLUTION: A storage structure 100 of an ultra fine bubble liquid U comprises: the ultra fine bubble liquid U containing bubbles being a nanometer order in a diameter; a first storage part 60 storing the ultra fine bubble liquid U inside; and a humidity adjustment part 90 for adjusting relative humidity in an outside surface 61B of the first storage part 60 so as to become 52% or more.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a structure for containing ultra-fine bubble liquid and a method for containing ultra-fine bubble liquid. [Background technology]

[0002] In recent years, liquids (ultra-fine bubble liquids) containing bubbles (ultra-fine bubbles) with diameters on the order of nanometers have attracted attention in various fields, and techniques for generating such liquids have been proposed. For example, Patent Document 1 discloses a method in which liquid pressurized by a pump is made to flow through multiple bubble generating tubes made of porous alumina held in a microbubble generator, and gas delivered from a gas cylinder is sent to the outside of the tubes to generate liquid with bubbles of 1 μm or less blown into the tubes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-170278 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the ultra-fine bubble liquid produced, the number of ultra-fine bubbles per unit volume (bubble concentration) may decrease over time due to the defoaming of ultra-fine bubbles, aggregation of multiple ultra-fine bubbles, etc. In order to ensure the quality and to achieve the expected effects and efficacy of ultra-fine bubble liquid, it is desirable to suppress the decrease in bubble concentration.

[0005] The present disclosure is a technology that has been completed based on the above-mentioned circumstances, and one of its objectives is to provide a structure for containing ultra-fine bubble liquid, and a method for containing ultra-fine bubble liquid, which can suppress a decrease in bubble concentration. [Means for solving the problem]

[0006] The present disclosure relates to a structure for containing ultra-fine bubble liquid, comprising: ultra-fine bubble liquid containing bubbles having diameters on the order of nanometers; a first container for containing the ultra-fine bubble liquid inside; and a humidity adjustment unit for adjusting the relative humidity on the outer surface of the first container to 52% or higher.

[0007] The present disclosure also relates to a method for storing ultra-fine bubble liquid, which comprises storing ultra-fine bubble liquid containing bubbles with diameters on the order of nanometers inside a first storage section and adjusting the relative humidity on the outer surface of the first storage section to 52% or higher. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide a structure for containing ultra-fine bubble liquid and a method for containing ultra-fine bubble liquid that can suppress a decrease in bubble concentration. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing an ultra-fine bubble liquid generating device in embodiment 1. [Diagram 2] Schematic diagram showing the ultra-fine bubble liquid storage structure [Diagram 3] Graph showing retention rate versus elapsed days in Examples 9 to 11 and Comparative Example 10 [Figure 4] A perspective view showing a structure for containing ultra-fine bubble liquid according to embodiment 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] First, embodiments of the present disclosure will be listed and described. (1) The ultra-fine bubble liquid storage structure of the present disclosure comprises ultra-fine bubble liquid containing bubbles having diameters on the order of nanometers, a first storage section for storing the ultra-fine bubble liquid inside, and a humidity adjustment section for adjusting the relative humidity on the outer surface of the first storage section to 52% or higher.

[0011] (2) The ultra-fine bubble liquid storage structure described in (1) may include a second storage section that stores the first storage section inside, and a gap may be provided between the outer surface of the first storage section and the second storage section.

[0012] (3) In the ultra-fine bubble liquid storage structure described in (1) or (2), the humidity adjustment section may be disposed in the gap.

[0013] (4) In the ultra-fine bubble liquid storage structure described in any one of (1) to (3), the humidity adjustment section may adjust the relative humidity on the outer surface of the first storage section to 98% or less.

[0014] (5) The ultra-fine bubble liquid storage structure described in any one of (1) to (4) may be provided with a temperature adjustment unit that adjusts the temperature on the outer surface of the first storage unit to be between 1 degree and 35 degrees.

[0015] (6) In addition, the method of storing ultra-fine bubble liquid disclosed herein stores ultra-fine bubble liquid containing bubbles with diameters on the order of nanometers inside a first storage section, and adjusts the relative humidity on the outer surface of the first storage section to 52% or higher.

[0016] (7) In the method for storing ultra-fine bubble liquid described in (6), the relative humidity on the outer surface of the first storage section may be adjusted to 98% or less.

[0017] (8) In the method for storing ultra-fine bubble liquid described in (6) or (7), the temperature of the outer surface of the first storage section may be adjusted to be 1 degree or higher and 35 degrees or lower.

[0018] <Embodiment 1> A first embodiment of the present disclosure will be described with reference to Figures 1 to 3. The present disclosure is not limited to the following examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0019] 1 shows a generator 1 for generating ultra-fine bubble liquid U by generating bubbles (ultra-fine bubbles) with diameters on the order of nanometers in a liquid. The generator 1 includes a first tank 10, a second tank 20 connected to the bottom surface 10A side of the first tank 10, a gas supply unit 30 for supplying gas to the first tank 10, a liquid supply unit 40 for supplying liquid to the first tank 10, and a control unit 50 for controlling the supply of gas and liquid. The first tank 10 and the second tank 20 are housings capable of temporarily storing gas and liquid while maintaining an airtight state. The first tank 10 and the second tank 20 are provided with pressure detection units 11 and 21, respectively, capable of detecting the internal pressure.

[0020] The gas supply unit 30 includes a gas on-off valve 32 that opens and closes a tube that is connected to the first tank 10 and serves as a gas flow path, and a pressure detection unit 31 that detects the pressure of the gas supply unit 30. Examples of gases that can be supplied from the gas supply unit 30 to the first tank 10 include air, water vapor, hydrogen (H2, D2, T2), rare gases (He, Ne, Kr, Xe, Rn, Ar), oxygen, ozone, carbon monoxide, carbon dioxide, nitrogen, ammonia, chlorine, hydrogen chloride gas, dicyan, sulfur dioxide, hydrogen iodide, phosphine, nitrogen oxides (NO, NO2, NO3, N2O, N2O2, N2O3, N2O4, N2O5, N2O6), hydrocarbons (alkanes and paraffins such as methane and ethane; ethylene, propane, etc.), and the like. One or more of the following gases can be used: alkenes such as pyrene; alkynes such as acetylene; fluorinated gases (F2, HF, CF4, C2F6, C3F8, C4F8, CHF3, SF6, NF3, SiF4), chloride gases (Cl2O, C2H5Cl, HCl, NOCl, CH2Cl, COCl2), bromide gases (Br2, HBr), alcohols, amines, aldehydes, esters, ethers, ketones, terpenes, lactones, thiols, fragrances, and essential oils.

[0021] The liquid supply unit 40 includes a liquid on-off valve 41 that opens and closes a pipe that is connected to the first tank 10 and serves as a liquid flow path. The liquid supplied from the liquid supply unit 40 to the first tank 10 may be at least one or more liquids selected from the group consisting of water (pure water, ultrapure water, purified water, tap water), alcohol such as ethanol, or hydrogen peroxide.

[0022] The second tank 20 includes a tubular communicating pipe 22 that penetrates the bottom surface 10A of the first tank 10 and communicates with the inside of the first tank 10, an element (porous body) 24 provided at the bottom of the communicating pipe 22, and an injection valve 23 provided in the middle of the communicating pipe 22. The communicating pipe 22 allows the gas and liquid stored in the first tank 10 to flow through the element 24. The injection valve 23 opens and closes the flow paths of the gas and liquid flowing through the communicating pipe 22.

[0023] The control unit 50 is electrically connected to the first tank 10, the second tank 20, the gas supply unit 30, and the liquid supply unit 40, and controls the opening and closing of the gas on-off valve 32, the liquid on-off valve 41, and the injection valve 23 based on the pressures detected by the pressure detection units 11, 21, and 31, etc.

[0024] The element 24 is a cylindrical ceramic, and is formed so that a large number of pores are connected throughout the element 24. The element 24 is attached to the lower part of the communicating pipe 22, and is configured so that the gas and liquid flowing through the communicating pipe 22 can flow into the inside 24A of the element 24. The ceramic constituting the element 24 is, for example, a sintered body obtained by sintering one or more materials selected from the group consisting of alumina, aluminum nitride, silicon oxide (silicon monoxide, silicon dioxide (silica)), silicon nitride, boron nitride, zirconia, titania, mullite, magnesia, ceria, doped ceria, alumina cement, calcium phosphate, glass, barium titanate, ferrite, steatite, forsterite, silicon carbide, zeolite, silica glass, silicate glass, and shirasu glass. Among them, the ceramic is preferably a sintered body obtained by sintering alumina.

[0025] In the generation process of generating the ultra-fine bubble liquid U, first, gas is supplied from the gas supply unit 30 to the first tank 10 to fill the insides of the first tank 10 and the second tank 20 with the gas. Then, after closing the liquid on-off valve 41, the gas on-off valve 32, and the injection valve 23, the liquid on-off valve 41 is opened to supply liquid to the first tank 10. Thereafter, the liquid on-off valve 41 is closed and the gas on-off valve 32 is opened to supply gas to the first tank 10. At this time, the gas is supplied so that the pressure inside the first tank 10 becomes a pressure (for example, 0.5 MPa) higher than the atmospheric pressure by adjusting the opening and closing of the gas on-off valve 32. As a result, the gas and liquid are pressurized and stored inside the first tank 10. Meanwhile, the pressure inside the second tank 20 is adjusted to be lower than the pressure inside the first tank 10 after pressurization.

[0026] When the injection valve 23 is opened in this state, the gas and liquid stored in the first tank 10 flow through the communicating tube 22 into the interior 24A of the element 24, and are sprayed from the interior 24A of the element 24 to the outside. At this time, the gas and liquid that have flowed into the interior 24A of the element 24 pass through the multiple pores of the element 24 and are sprayed to the outside of the element 24, and are stored in the second tank 20 as ultra-fine bubble liquid U, which is a mixture of bubbles containing the gas and the liquid. The ultra-fine bubble liquid U can be taken out from the outlet 19 provided in the second tank 20.

[0027] The ultra-fine bubble liquid U contains bubbles (ultra-fine bubbles) whose diameters are on the order of nanometers. The order of nanometers refers to a value in the range of 1 nm to 999 nm. The diameter of such bubbles can be adjusted, for example, by changing the pore size of the element 24. The pore size of the element 24 can be adjusted, for example, by changing the particle size of the ceramic material constituting the element 24 (for example, the particle size of alumina).

[0028] The ultrafine bubbles can be contained in various products, etc., in addition to at least one or more liquids selected from the group consisting of the above-mentioned water (pure water, ultrapure water, purified water, tap water), alcohol such as ethanol, and hydrogen peroxide solution. Examples of such products include cosmetics such as beauty essence, lotion, beauty pack, milky lotion, hair growth agent, hair growth agent, hair care product, body cleanser (cleansing, face wash, shampoo, body soap, etc.), perfume, fragrance, etc.; beverages, alcoholic beverages, seasonings, soups, retort foods (liquid foods, etc.), and foods such as supplements; water for injection, physiological saline, extracellular fluid replacement fluid, artificial colloid, artificial blood, blood transfusion, blood preparations, and buffer solutions (acetate buffer, phosphate buffer, citrate buffer, citrate phosphate buffer (McIlvaine buffer), borate buffer, tartrate buffer, Tris buffer, phosphate buffered saline, etc.). Examples of the ultra-fine bubbles include medical supplies such as body washes (eye washes, nose washes, stomach washes, lung washes, intestinal washes, etc.), contact lens washes, eye drops, injection preparations, injections (DDS preparations, vaccines, low molecular weight drugs, medium molecular weight drugs, high molecular weight drugs, genetic drugs), nebulizer liquids, and liquids for liquid breathing; bio-products such as culture fluids (glucose-containing culture fluids, albumin-containing culture fluids, antibody-containing liquid culture fluids, vitamin-containing culture fluids, serum-containing culture fluids, plasma-containing culture fluids, etc.); and other products such as alcohols, organic solvents (hexane, acetone, gasoline, kerosene, diesel, and other hydrocarbons), and heavy water. Ultra-fine bubbles can be applied to such products by, for example, adding the ultra-fine bubble liquid U generated by the generation device 1 to the above-mentioned products, or by using the liquid supplied from the liquid supply unit 40 as the above-mentioned products. In this disclosure, the ultra-fine bubble liquid U may refer to the above-mentioned product or the like as a liquid containing ultra-fine bubbles (i.e., in the storage structure 100 described below, the inside of the first storage section 60 may contain the above-mentioned product or the like as a liquid containing ultra-fine bubbles).

[0029] 2 shows a storage container (storage structure) 100 that stores ultra-fine bubble liquid U. The storage container 100 is used as a container such as a reagent container, an experimental vial, a medicine container, a culture medium container, a food container, a beverage container, or a cosmetic container.

[0030] The storage container 100 comprises ultra-fine bubble liquid U generated by the generation device 1, a first storage section 60 for storing the ultra-fine bubble liquid U therein, a second storage section 70 for storing the first storage section 60 therein, and a lid section 80. The storage container 100 has a double structure composed of the first storage section 60 and the second storage section 70. The first storage section 60 and the second storage section 70 each comprise a main body section 61, 71 spaced apart from each other, and abutting sections 62, 72 arranged above the main body sections 61, 71 and in contact with each other. A lid section 80 is attached to the upper parts 63, 73 of the abutting sections 62, 72. The first storage section 60 and the second storage section 70 have an opening 64 arranged inside the upper part 63 of the first storage section 60, which is opened or closed by attaching or removing the lid section 80. When the opening 64 is closed by the lid portion 80, the inner space of the first storage portion 60 and the inner space of the second storage portion 70 are sealed.

[0031] The material of the first storage section 60 and the second storage section 70 is not particularly limited, but may be, for example, one or more materials selected from the group consisting of synthetic resins (polypropylene, polyethylene, high density polyethylene, polyethylene terephthalate, polytetrafluoroethylene, polystyrene, rubber, butyl rubber, etc.), ceramics (alumina, titania, zirconia, etc.), glass, quartz, alumite, iron oxide, copper oxide, silver oxide, and paper. The materials of the first storage section 60 and the second storage section 70 may be the same material or different materials.

[0032] The main body parts 61, 71 include a first main body part 61 and a second main body part 71 that is disposed outside the first main body part 61 and has an outer shape slightly larger than that of the first main body part 61. An inner surface 61A of the first main body part 61 is in contact with the ultra-fine bubble liquid U. A gap S is provided between an outer surface 61B of the first main body part 61 and an inner surface 71A of the second main body part 71. The first main body part 61 includes a circular bottom wall part 61C and a cylindrical side wall part 61D that rises from an end part of the bottom wall part 61C. The thickness of the bottom wall part 61C may be thicker than the thickness of the side wall part 61D. The gap S is filled with gas. The gas is not particularly limited, but air, nitrogen, argon, or the like can be used. An outer surface 71B of the second main body part 71 is in contact with the outside air of the storage container 100.

[0033] The storage container 100 includes a humidity adjusting section 90 disposed in the gap S and a temperature adjusting section 95 disposed below the second main body section 71. The shape, configuration, etc. of the humidity adjusting section 90 are not particularly limited, and may be, for example, a gel-like body contained in a breathable bag, or may be the gel-like body itself disposed in the gap S. The humidity adjusting section 90 adjusts the relative humidity at the outer surface 61B of the first main body section 61 to a predetermined range by drying or wetting the gas filling the gap S. The "relative humidity at the outer surface 61B" may be, for example, the relative humidity of the gas present in the gap S, or may be the relative humidity of the gas present within a range of a predetermined distance (for example, 10 mm) from the outer surface 61B toward the outside. On the outer surface 61B, the range of relative humidity adjusted by the humidity adjustment section 90 may be 52% or more, 60% or more, 65% or more, 70% or more, 98% or less, 90% or less, 85% or less, or 80% or less.

[0034] The temperature adjustment unit 95 is in contact with the outer side surface 71B of the second main body portion 71. The second main body portion 71 is placed on the temperature adjustment unit 95. The shape, configuration, etc. of the temperature adjustment unit 95 are not particularly limited, and may be, for example, a temperature adjustment device that heats or cools the second main body portion 71. The temperature adjustment unit 95 heats or cools the second main body portion 71, thereby heating or cooling the gas filling the gap S, thereby adjusting the temperature at the outer side surface 61B of the first main body portion 61 to a predetermined range. The "temperature at the outer side surface 61B" may be, for example, the temperature of the gas present in the gap S, or the temperature of the gas present within a range within a predetermined distance (for example, 10 mm) from the outer side surface 61B toward the outside. The temperature range adjusted by the temperature adjustment unit 95 at the outer side surface 61B may be 1 degree or more, 3 degrees or more, 5 degrees or more, 35 degrees or less, 27 degrees or less, 20 degrees or less, or 15 degrees or less.

[0035] The method for storing the ultra-fine bubble liquid U includes a storing step of storing the ultra-fine bubble liquid U inside the first storage section 60, and a humidity adjusting step of adjusting the relative humidity on the outer surface 61B to be within the above-mentioned predetermined range (for example, 52% or more and 98% or less).The method for storing the ultra-fine bubble liquid U also includes a temperature adjusting step of adjusting the temperature on the outer surface 61B to be within the above-mentioned predetermined range (for example, 1°C or more and 35°C or less).

[0036] In the storage step, the ultra-fine bubble liquid U generated in the generation step is poured into the first storage section 60 through the opening 64, and the opening 64 is closed with the lid section 80 to hermetically seal the first storage section 60 and store the ultra-fine bubble liquid U. In the humidity adjustment step, a humidity adjustment section 90 is disposed in the gap S to adjust the relative humidity on the outer surface 61B. In the temperature adjustment step, the second main body section 71 is placed on a temperature adjustment section 95, and heating or cooling is performed by the temperature adjustment section 95 to adjust the temperature on the outer surface 61B. The steps may be performed in the order of the storage step, humidity adjustment step, and temperature adjustment step, or in another order (for example, the humidity adjustment step, temperature adjustment step, storage step).

[0037] Moreover, the method may be a manufacturing method for manufacturing the containment structure 100 for the ultra-fine bubble liquid U by carrying out the above-mentioned containing step and humidity adjusting step. This manufacturing method may include the above-mentioned generating step and temperature adjusting step.

[0038] Next, the effects of this embodiment will be described. In this embodiment, a structure 100 for containing ultra-fine bubble liquid U is shown, which comprises ultra-fine bubble liquid U containing bubbles with diameters on the order of nanometers, a first container 60 for containing the ultra-fine bubble liquid U inside, and a humidity adjusting section 90 for adjusting the relative humidity on the outer surface 61B of the first container 60 to 52% or more.

[0039] Generally, ultra-fine bubbles have a negative charge and undergo electrophoresis. Therefore, for example, if the container that contains the ultra-fine bubble liquid U is positively charged, the ultra-fine bubbles contained inside it are attracted to the inner surface of the container, adhere to it, and may aggregate, rising to the surface and disappear (defoaming). On the other hand, if the container is negatively charged, the ultra-fine bubbles contained inside it are repelled from the inner surface of the container and come into contact with other ultra-fine bubbles (the probability of contact increases), and may aggregate or disappear. However, according to the above-mentioned storage structure 100 for the ultra-fine bubble liquid U, the discharge of the static electricity charged in the first container 60 can be promoted by adjusting the humidity on the outer surface 61B of the first container 60. This prevents the ultra-fine bubbles from aggregating or disappearing due to the above-mentioned reasons, and prevents the concentration of bubbles in the ultra-fine bubble liquid U from decreasing.

[0040] The storage structure 100 for the ultra-fine bubble liquid U includes a second storage section 70 that houses the first storage section 60 inside, and a gap S is provided between the outer surface 61B of the first storage section 60 and the second storage section 70.

[0041] Such a storage structure 100 for ultra-fine bubble liquid U makes it difficult for vibrations and impacts applied to the second storage section 70 to be transmitted to the first storage section 60, thereby preventing the loss of ultra-fine bubbles due to vibrations and the like, which would reduce the concentration of bubbles in the ultra-fine bubble liquid U. The storage structure 100 can also buffer vibrations and the like, enabling the storage and distribution of the ultra-fine bubble liquid U. Furthermore, since the first storage section 60 is stored inside the second storage section 70, gas flow near the outer surface 61B of the first storage section 60 can be prevented, making it easy to adjust the relative humidity at the outer surface 61B.

[0042] The humidity adjusting unit 90 is disposed in the gap S.

[0043] Such a storage structure 100 for the ultra-fine bubble liquid U can be structured to easily adjust the relative humidity on the outer surface 61B of the first storage section 60. Moreover, with the relative humidity on the outer surface 61B of the first storage section 60 adjusted by the humidity adjustment section 90, the ultra-fine bubble liquid U can be easily stored and distributed.

[0044] The humidity adjusting section 90 adjusts the relative humidity on the outer surface 61B of the first housing section 60 to 98% or less.

[0045] According to such a containment structure 100 for the ultra-fine bubble liquid U, the decrease in the bubble concentration of the ultra-fine bubble liquid U can be further suppressed.

[0046] The storage structure 100 for the ultra-fine bubble liquid U includes a temperature adjusting section 95 that adjusts the temperature of the outer surface 61B of the first storage section 60 to be between 1 degree and 35 degrees.

[0047] Such a storage structure 100 for the ultra-fine bubble liquid U can reduce the viscosity of the ultra-fine bubble liquid U, thereby suppressing the electrophoresis, Brownian motion of the ultra-fine bubbles, and convection of the ultra-fine bubble liquid U. It also makes it possible to prevent the ultra-fine bubble liquid U from freezing, thereby further suppressing the aggregation and disappearance of the ultra-fine bubbles.

[0048] In addition, in this embodiment, a method of storing ultra-fine bubble liquid U containing bubbles with diameters on the order of nanometers is shown, in which the ultra-fine bubble liquid U is stored inside the first storage section 60 and the relative humidity on the outer surface 61B of the first storage section 60 is adjusted to 52% or higher.

[0049] According to this method of storing the ultra-fine bubble liquid U, the humidity on the outer surface 61B of the first storage section 60 can be adjusted to promote the discharge of static electricity that has built up in the first storage section 60. This makes it possible to prevent the ultra-fine bubbles from coagulating or disappearing due to the electrophoresis, and to prevent a decrease in the bubble concentration of the ultra-fine bubble liquid U.

[0050] In the method for storing the ultra-fine bubble liquid U, the relative humidity on the outer surface 61B of the first storage section 60 is adjusted to 98% or less.

[0051] According to such a method for storing the ultra-fine bubble liquid U, the concentration of bubbles in the ultra-fine bubble liquid U can be further prevented from decreasing.

[0052] In the method for storing the ultra-fine bubble liquid U, the temperature of the outer surface 61B of the first storage section 60 is adjusted to be 1 degree or higher and 35 degrees or lower.

[0053] This method of storing the ultra-fine bubble liquid U reduces the viscosity of the ultra-fine bubble liquid U, thereby suppressing the electrophoresis, Brownian motion of the ultra-fine bubbles, and convection of the ultra-fine bubble liquid U. It also makes it possible to prevent the ultra-fine bubble liquid U from freezing, thereby further suppressing the aggregation and disappearance of the ultra-fine bubbles. EXAMPLES

[0054] The present technology will be described in detail below based on examples, but the present technology is not limited to these examples.

[0055] <Examples 1 to 8 and Comparative Examples 1 to 9> [Preparation of ultra-fine bubble liquid] 2-5 ml of pure water was supplied as liquid from the liquid supply unit to the first tank (internal volume 300 ml) of the generator, and then nitrogen was supplied as gas from the gas supply unit at a pressure of 0.5 MPa. Then, the injection valve was opened to inject the gas and liquid from an element (alumina and silica sintered body) with a pore diameter of 1500 nm (porosity 31%), obtaining ultra-fine bubble liquid. This process was repeated several times to store the ultra-fine bubble liquid in the second tank.

[0056] [Storage of ultra-fine bubble liquid in a storage container] The bubble concentration (initial concentration) of the ultra-fine bubble liquid taken out of the second tank was measured using a NanoSight (registered trademark, manufactured by Malvern Instruments, Nano Tracking Particle Size Measurement Device, model number: NS300). NanoSight is capable of measuring the concentration of bubbles with diameters of 30 nm to 999 nm. Then, 10 ml of this ultra-fine bubble liquid was poured into a glass vial (corresponding to the first storage section), and the opening of the glass vial was closed with a cap (corresponding to the lid section). This glass vial was placed inside a temperature and humidity adjustment device (a device having a configuration corresponding to the second storage section, humidity adjustment section, and temperature adjustment section) to form a storage structure for the ultra-fine bubble liquid.

[0057] The glass vial used was a Violamo screw-cap vial (manufactured by AS ONE Corporation; "Violamo" is a registered trademark) with a capacity of 13 ml, a side wall thickness of 1.3 mm, a bottom wall thickness of 1.7 mm, and made of borosilicate glass-1 (JR-1). The cap (lid) used had a top plate thickness of 2 mm and was made of polypropylene. A gasket was placed inside the cap, between the top plate and the glass vial. The gasket used was a circular laminate with a thickness of 1 mm and made of polypropylene, polyethylene, and polypropylene laminated in that order.

[0058] A Bench-Top Type Temperature & Humidity Chamber (manufactured by Espec Corporation, model number: SH-261) was used as the temperature and humidity adjustment device. This temperature and humidity adjustment device can adjust the air inside (gas on the outer surface of the glass vial contained inside) to a predetermined relative humidity and temperature. A temperature and humidity measuring device (manufactured by T&D Corporation, data logger, model number: TR-74Ui-S) was contained together with the glass vial inside this temperature and humidity adjustment device to measure the relative humidity and temperature of the gas on the outer surface of the glass vial.

[0059] [Evaluation of retention rate after 7 days] In the ultra-fine bubble liquid storage structure, the relative humidity and temperature were adjusted to the specified values ​​by a temperature and humidity adjusting device, and the bubble concentration of the ultra-fine bubble liquid after 7 days was measured using a nanosite. The bubble concentration after 7 days was then divided by the initial concentration to calculate the retention rate (%), which is a percentage value. The results are shown in Table 1.

[0060] In Table 1, the relative humidity and temperature of each storage container are adjusted to arbitrary values ​​and are shown as Examples 1 to 8 and Comparative Examples 1 to 9. For example, in Example 1, ultra-fine bubble liquid (initial concentration 2.460×10 8The glass vial containing 1.495 × 10 bubbles / ml was placed inside a temperature and humidity control device with a relative humidity of 56.9% and a temperature of 25.2 degrees. After 7 days in this condition, the bubble concentration (1.495 × 10 8 As a result of measuring the retention rate (number of bubbles / ml), it was found that the retention rate was 60.8%. In Comparative Example 9, the ultra-fine bubble liquid was frozen, so the bubble concentration was measured after thawing.

[0061] [Table 1]

[0062] In Examples 1 to 8, the relative humidity was over 50%, the temperature was 1 degree or more, and the retention rate after 7 days was 50% or more. When the relative humidity was 100% (Comparative Example 8) or when the temperature was such that the ultra-fine bubble liquid was frozen (Comparative Example 9), the retention rate was lower than that of each Example. When the relative humidity was 72.9% and the temperature was 5.2 degrees (Example 4), and when the relative humidity was 80.0% and the temperature was 10.0 degrees (Example 7), the retention rates were 86.9% and 87.2%, respectively, which were higher than those of the other Examples and Comparative Examples. According to Example 8, the relative humidity is preferably 96.0% or less. For example, in Comparative Example 8, the retention rate is less than 50%. According to each Example, the temperature is preferably 39 degrees or less. For example, in Comparative Examples 2 to 4, the retention rate is less than 50%.

[0063] <Examples 9 to 11 and Comparative Example 10> [Storage of ultra-fine bubble liquid in a storage container] As in Example 1, 10 ml of the ultra-fine bubble liquid removed from the second tank and measured for initial concentration was poured into the inside of a glass vial, and the opening of the glass vial was closed with a cap (referred to as the first lid). Meanwhile, TEKIjuN (registered trademark, manufactured by Sharp Corporation) bead type was placed as a humidity control part inside a plastic vial (corresponding to the second storage part) made of polyethylene and having a capacity of 100 ml. In addition, the outer surface of the first lid was attached to the inner surface of the cap (referred to as the second lid part) of this plastic vial with double-sided tape. In this state, the second lid part was attached to the plastic vial so that the glass vial was stored inside the plastic vial, thereby forming a storage container that contains ultra-fine bubble liquid. The outer surface of the glass vial is not in contact with the inner surface of the plastic vial or the humidity control part.

[0064] This storage container was stored at room temperature (25°C), and the retention rate after 1 day, 4 days, and 7 days were calculated using the same procedure as in Example 1 above. The results are shown in Table 2 and FIG. 3. In Table 2, the storage containers in which the relative humidity was adjusted to an arbitrary value are shown as Examples 9 to 11 and Comparative Example 10. In Examples 9 and 11, and Comparative Example 10, TEKIjuN with relative humidity adjusted to 70%, 90%, and 50%, respectively, was used. In Example 10, a mixture of TEKIjuN with relative humidity adjusted to 70% and 90% was used.

[0065] [Table 2]

[0066] As in Examples 9 to 11, by adjusting the relative humidity to exceed 50%, it is possible to produce a storage container for ultra-fine bubble liquid that can maintain a retention rate of more than 50% even after 7 days. In each Example, the retention rate after 1 day is 20% or more higher than that of Comparative Example 10. Furthermore, by using a storage container like those in Examples 9 to 11, it is possible to suppress a decrease in the bubble concentration of the ultra-fine bubble liquid even at room temperature, making it possible to produce a storage container that can be used to store and distribute ultra-fine bubble liquid.

[0067] <Embodiment 2> Next, a second embodiment of the present disclosure will be described with reference to Fig. 4. In this embodiment, the same components as those in the above embodiment are designated by the same reference numerals, and redundant descriptions of the structure, operation, and effects will be omitted.

[0068] The storage container (storage structure) 200 comprises ultra-fine bubble liquid U generated by the generation device, a plurality of first storage sections 260 which store the ultra-fine bubble liquid U inside, a plurality of humidity adjustment sections 90 which are placed on the upper side of the plurality of first storage sections 260 and which adjust the relative humidity on the outer surfaces of the plurality of first storage sections 260 within a predetermined range, and a second storage section 270 which stores the plurality of first storage sections 260 and the plurality of humidity adjustment sections 90 inside.

[0069] The first storage section 260 includes a bottle-shaped first main body section 261 and a first lid section 264 that is attached to the top of the first main body section 261 and can close the top opening of the first main body section 261. The second storage section 270 includes a box-shaped second main body section 271 that is open at the top and a second lid section 274 that is attached to the top end of the second main body section 271 and can open and close the top opening of the second main body section 271. The humidity adjustment section 90 is disposed in the gap between the first storage section 260 and the second storage section 270. The humidity adjustment section 90 adjusts the relative humidity on the outer surface of the multiple first storage sections 260 to a predetermined range by drying or wetting the gas that fills this gap. The humidity adjustment section 90 may be disposed on the side or below the first storage section 260.

[0070] <Other embodiments> The present disclosure is not limited to the embodiments described above and in the drawings, and for example, the following embodiments are also included within the technical scope of the present disclosure. Furthermore, in addition to the embodiments described below, various modifications can be made without departing from the spirit of the present disclosure.

[0071] (1) The configuration of the humidity adjusting section can be changed as appropriate. For example, the humidity adjusting section may be a sheet-shaped humidity adjusting agent or a nonwoven fabric moistened with water.

[0072] (2) The configuration of the temperature adjustment unit can be changed as appropriate. For example, the temperature adjustment unit may be a refrigerant cooled by a cooling device or a chemical heating element such as a pocket warmer. The temperature adjustment unit may also be disposed in the gap between the first housing unit and the second housing unit.

[0073] (3) In addition to the above-described embodiment, the shape of the first storage section and the second storage section can be appropriately changed. The shape of each storage section may be, for example, a cylindrical shape, a rectangular prism shape, a hexagonal prism shape, or an irregular shape.

[0074] (4) The shape of the porous body can be changed as appropriate. In the above embodiment, the porous body is cylindrical, but is not limited to this. For example, the porous body may be plate-shaped or spherical. The shape of the pores of the porous body can be changed as appropriate. The shape of the pores may be, for example, a through hole penetrating the porous body from the inside to the outside.

[0075] (5) The ultra-fine bubble liquid generating device and generating method are not limited to the above embodiment, and various generating devices and generating methods can be adopted. [Explanation of symbols]

[0076] 60,260...first storage section, 61B...outer surface, 70,270...second storage section, 90...humidity adjustment section, 95...temperature adjustment section, 100,200...storage container (storage structure), S...gap, U...ultra-fine bubble liquid

Claims

1. Ultra-fine bubble liquid containing bubbles with diameters on the order of nanometers; A first storage section for storing the ultra-fine bubble liquid therein; A humidity adjustment section that adjusts the relative humidity on the outer surface of the first storage section to 52% or higher.

2. A second housing portion that houses the first housing portion therein, The ultra-fine bubble liquid storage structure according to claim 1 , wherein a gap is provided between the outer surface of the first storage section and the second storage section.

3. The ultra-fine bubble liquid storage structure according to claim 2 , wherein the humidity adjusting section is disposed in the gap.

4. 3. The ultra-fine bubble liquid storage structure according to claim 1, wherein the humidity adjusting section adjusts the relative humidity on the outer surface of the first storage section to 98% or less.

5. 3. The ultra-fine bubble liquid storage structure according to claim 1, further comprising a temperature adjusting section that adjusts the temperature of the outer surface of the first storage section to be between 1 degree and 35 degrees.

6. An ultra-fine bubble liquid containing bubbles having a diameter on the order of nanometers is contained inside the first container, A method for storing ultra-fine bubble liquid, comprising adjusting the relative humidity on the outer surface of the first storage section to 52% or more.

7. The method for storing ultra-fine bubble liquid according to claim 6, wherein the relative humidity on the outer surface of the first storage section is adjusted to 98% or less.

8. The method for storing ultra-fine bubble liquid according to claim 6 or 7, wherein the temperature of the outer surface of the first storage section is adjusted to be 1°C or higher and 35°C or lower.

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