WO2005056168A1 - 単分散気泡の生成方法 - Google Patents
単分散気泡の生成方法 Download PDFInfo
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- WO2005056168A1 WO2005056168A1 PCT/JP2004/018558 JP2004018558W WO2005056168A1 WO 2005056168 A1 WO2005056168 A1 WO 2005056168A1 JP 2004018558 W JP2004018558 W JP 2004018558W WO 2005056168 A1 WO2005056168 A1 WO 2005056168A1
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- 239000003501 hydroponics Substances 0.000 description 2
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
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- 235000015170 shellfish Nutrition 0.000 description 1
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- 239000010703 silicon Substances 0.000 description 1
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- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
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- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/26—Foam
Definitions
- the present invention relates to a method for producing monodisperse bubbles.
- Non-Patent Document l Clift, R et al. "Bubbles, Drops, and Particles", Academic Press (1978)
- Non-patent Document 2 Hideki Takushoku: “Progress in Chemical Engineering, 16 Bubbles, Drop Dispersion Engineering,” Bookstore, 1 (1982)
- a main object of the present invention is to provide a method for producing bubbles having excellent monodispersibility.
- the present invention relates to the following method for generating bubbles.
- [0007] A method for generating air bubbles by injecting and dispersing a gas into a liquid through a porous material,
- the value obtained by dividing the pore diameter when occupying 10% of the entire pore volume by the pore diameter when occupying 90% of the entire pore volume in the relative cumulative pore distribution curve is: 1 is 1.5
- An air bubble generation method characterized in that:
- bubbles having excellent monodispersibility can be reliably obtained.
- the cell diameter can be arbitrarily adjusted by changing the pore diameter and the like of the porous body.
- the monodisperse bubbles obtained by the method of the present invention are included in hydroponics, cultivation of fish and shellfish, and inclusion of bubbles. It can be applied to a wide range of fields such as foods, microcapsules, pharmaceutical preparations and cosmetics, various foaming materials, foam separation using air bubbles, and the separation process of flotation.
- the bubble generation method of the present invention involves dispersing a gas under pressure into a liquid through a porous body. And generating a bubble by
- the value obtained by dividing the pore diameter when occupying 10% of the entire pore volume by the pore diameter when occupying 90% of the entire pore volume in the relative cumulative pore distribution curve is: 1.1.5.
- the pore diameter when the porous body occupies 10% of the entire pore volume in the relative cumulative pore distribution curve is “10% diameter”, and the volume of the entire pore volume is Of 9
- the pore diameter when occupying 0% is called “90% diameter”.
- the value obtained by dividing the 10% diameter by the 90% diameter in the relative cumulative pore distribution curve is 11-5, preferably 1.2-1. is there.
- the pore size of the porous material is not particularly limited, but is generally 0.02 to 25 / im
- the porous body only needs to have a uniform pore diameter as defined above.
- the shape of the pore is not particularly limited as long as it is a through pore, and may be any shape such as a columnar shape and a prismatic shape. Further, the pores may penetrate perpendicularly to the surface of the porous body, or may penetrate obliquely, or may be entangled.
- the porous body preferably has a uniform hydraulic diameter of the pores. Such a pore structure can be suitably used in the present invention.
- the shape of the porous body is not limited, and it is sufficient that the gas is dispersed in the liquid.
- examples thereof include a film shape, a block shape, a disk shape, a prism shape, and a column shape. These can be appropriately selected depending on the purpose of use, application, and the like.
- a film-like porous body can be suitably used.
- the film-shaped porous body may have any shape such as a pipe shape and a flat film type. Further, either a symmetric film or an asymmetric film may be used. Further, either a homogeneous film or a heterogeneous film may be used. These shapes and structures are suitable for the type of liquid to be used, the target bubbles, etc. You can choose whatever you want.
- the size of the porous body is not limited, and can be appropriately selected according to the purpose of generating bubbles, the method of using the porous body, and the like.
- the material constituting the porous body is not limited, and can be appropriately selected.
- Preferred materials include glass, ceramics, silicon, and polymers.
- glass (porous glass) can be particularly preferably used.
- a porous glass produced by utilizing glass microphase separation can be suitably used.
- a known glass can be used, and for example, a glass produced by utilizing glass microphase separation can be suitably used.
- the porous body desirably has good wettability with the liquid to be used. It can be used after it has been subjected to surface treatment or surface modification by a known method so as to be hardly or not wetted by the liquid used, and to be wetted by the liquid. Wetting with liquid, when the contact angle of the liquid to the surface of the porous body is more than 0 ° and less than 90 °, especially more than 0 ° and less than 45 °, and more than 0 ° and less than 30 ° Is preferred.
- the gas used in the present invention is not particularly limited, and a desired gas can be appropriately used.
- substances that are gaseous at room temperature such as air, nitrogen gas, oxygen gas, ozone gas, carbon dioxide, methane, hydrogen gas, ammonia, and hydrogen sulfide; and substances that are liquid at room temperature such as ethyl alcohol, water, and hexane.
- the liquid used in the present invention is not particularly limited, and various liquids can be used. Examples include water; oils such as oils and fats, and organic solvents.
- an additive may be added to the liquid in order to stabilize the obtained bubbles.
- the additive at least one selected from emulsifiers, emulsion stabilizers, foaming agents and alcohols can be preferably used.
- emulsifier a known or commercially available emulsifier can be used as long as it has an effect of reducing the interfacial tension of the liquid.
- the emulsifier may be either a water-soluble emulsifier or an oil-based emulsifier.
- water-soluble emulsifier a known hydrophilic emulsifier can be used.
- nonionic emulsifiers include glycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene glycol, lecithin, and polymer emulsifier. it can.
- anionic emulsifier include carboxylate, sulfonate, sulfate and the like.
- the HLB of these hydrophilic emulsifiers is preferably 8.0 or more, more preferably 10.0 or more.
- hydrophilic emulsifiers can be used alone or in combination of two or more depending on the desired emulsifying properties.
- the amount of these hydrophilic emulsifiers to be added is not particularly limited as long as a sufficient emulsifying effect is obtained, but is usually about 0.05 to 1% by weight based on the whole emulsion.
- the oil-based emulsifier for example, a nonionic emulsifier can be used. More specifically, glycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene polyoxypropylene glycol, lecithin and the like can be mentioned. These can be used alone or in combination of two or more. Among them, polyglycerin fatty acid esters and sucrose fatty acid esters are particularly preferable.
- the amount of the oil-based emulsifier to be added can be appropriately determined according to the type of the oil-based emulsifier to be used and the like. Usually, the amount may be about 0.05 to 30% by weight in the liquid.
- the emulsion stabilizer may be any as long as it covers the gas-liquid interface of the generated bubbles and stabilizes the bubbles, and examples thereof include synthetic polymers such as polybutyl alcohol and polyethylene glycol.
- the amount of addition is not particularly limited as long as a sufficient foaming effect can be obtained. Generally, the amount is preferably about 0.05 to 50% by weight in the liquid.
- the foaming agent is not limited as long as it can easily generate bubbles. Examples include glycosides such as saponin; polysaccharides such as sodium alginate and carrageenan; proteins such as albumin and casein.
- the amount of addition is not limited as long as a sufficient bubble-forming effect is obtained, but is usually about 0.05 to 50% by weight in the liquid.
- Examples of the alcohols include ethyl alcohol, propyl alcohol, and butanol.
- the addition of alcohols has the effect of reducing the interfacial tension ⁇ of the liquid and facilitating the generation of bubbles.
- the amount of the alcohol to be added is not particularly limited as long as a sufficient foaming effect can be obtained, but is usually about 0.05 to 50% by weight in the liquid.
- Ki the cow.
- bubbles are generated by injecting and dispersing a gas into a liquid through the above-mentioned porous body.
- the method of press-in and dispersion is not particularly limited.
- it can be implemented as follows. First, a liquid is brought into contact with one of the porous bodies, and a gas is brought into contact with the other. Next, by pressurizing the gas, the gas passes through the through pores of the porous body and is dispersed in the liquid. Examples of the method of pressurizing the gas include a method of forcibly filling the closed space with the gas, a method of filling the closed space with the gas, and then compressing the air with a piston or the like.
- the liquid (c) is sent by pump (d) to the porous glass membrane and membrane module (a).
- the gas in the gas cylinder (b) is sent to the porous glass membrane and the membrane module (a) while adjusting with the valve (e) while watching the pressure gauge (f).
- bubbles can be dispersed in the liquid.
- the particle size of the obtained bubbles can be measured by a particle size distribution meter (g).
- FIG. 2 shows a conceptual diagram of bubble generation in a porous body when gas is pressurized.
- AP 4 y cos 0 / Dm (However, ⁇ indicates the surface tension of the liquid with respect to the gas, ⁇ indicates the contact angle of the liquid existing on the porous body surface with the air, and Dm indicates the average pore diameter of the porous body.)
- ⁇ in order to obtain monodisperse cells having a smaller average cell diameter, it is desirable to control ⁇ to be about 0.2 lOMPa, particularly about 115MPa.
- the generation of bubbles may be either a batch type or a continuous type.
- the porous body is a flat film, it is preferable to stir the liquid with a stirrer or the like. Further, for example, when the porous body is a tubular membrane, it is preferable to circulate the liquid using a pump.
- the obtained monodispersed bubbles can be measured for particle size by a known method using a commercially available particle size analyzer.
- Bubbles obtained by the method of the present invention generally have a small bubble diameter and are monodisperse.
- the diameter when the bubble volume occupies 10% of the entire bubble volume is 0.5 times or more (preferably about 0.6 to 0.8 times) the diameter when the bubble volume occupies 50%.
- the diameter when the bubble volume occupies 90% of the entire bubble volume is 1.5 times or less (preferably about 0.2 to 1.4 times) the diameter when the bubble volume occupies 50%. It can also exhibit dispersibility.
- the average bubble diameter of the bubbles of the present invention is not limited, but is usually about 0.2 to 200 / im, and can be appropriately set according to the use and the like.
- the method of the present invention by changing the pore diameter of the porous body used, it is possible to control the bubble diameter of the bubbles in an arbitrary range.
- a nanobubble of 400 nm to 900 nm can be formed.
- the bubbles of the present invention can be applied to various uses such as the medical field, agricultural chemicals, cosmetics, and foods. Specifically, it can be used as a contrast agent, a drug delivery system (DDS) preparation, etc. for medical use.
- a contrast agent used for ultrasonic diagnosis
- the sensitivity of the contrast agent is dramatically improved because the bubbles exhibit a specific sensitizing effect on ultrasound.
- the microcapsules contain bubbles and irradiate a shock wave at a target site to disintegrate the capsules and release the drug in the capsules.
- the stability of monodispersed nanobubbles or monodispersed microbubbles can be used to improve the texture and taste of mousse foods and the like. Also, by blowing nanobubbles of inert gas such as nitrogen gas into beverages such as tea and milk in plastic bottles or packs, dissolved oxygen, which is a cause of beverage degradation, can be efficiently removed, and quality degradation Can be suppressed.
- inert gas such as nitrogen gas
- beverages such as tea and milk in plastic bottles or packs
- the stability of monodisperse nanobubbles or monodisperse microbubbles allows it to be used as a good-quality mousse (hair styling, cream for skin, etc.).
- the extremely large surface area of nanobubbles or microbubbles is used to dissolve oxygen in water, so that it can be suitably used for hydroponics, hydroxylation and the like.
- the use of ozone nanobubbles can efficiently sterilize water and the like.
- nanobubbles or microbubbles have a substance adhering action in a liquid, a large surface area can efficiently suppress the growth of microorganisms (antibacterial action) and can efficiently separate and recover suspended substances (foam). Separation method, flotation method).
- nanobubbles or microbubbles into contact with a body in a bath, a hot spring or the like, a higher blood flow promoting effect, a warming effect, a skin resuscitation effect, and the like can be obtained more.
- an anionic emulsifier sodium dodecyl sulfate
- a tubular porous glass membrane manufactured by SPG Techno Co., Ltd .; SPG membrane
- Air was injected and dispersed in an aqueous solution containing 5% by weight.
- the differential pressure ⁇ ⁇ between air and aqueous solution was 3. OMPa, and the liquid temperature was 25 ° C.
- the aqueous solution was pumped at a flow rate of 4. OmZs inside the membrane.
- the generated bubbles were directly introduced into a measurement cell of a particle size distribution meter (product name "SALD2000” manufactured by Shimadzu Corporation), and the bubble diameter distribution was measured.
- Fig. 3 shows the obtained bubble diameter distribution.
- the resulting bubbles are nanopubs with an average bubble diameter of 750 nm, which are excellent in monodispersity. It was nore.
- Example 1 the relationship between the pore diameter of the porous glass membrane and the average bubble diameter of the obtained bubbles was examined by changing the average pore diameter of the porous glass membrane.
- Example 1 the relationship between the minimum pressure ⁇ Pc (critical pressure) at which bubbles start to be generated when the average pore diameter of the porous glass membrane was changed and the average pore diameter of the porous glass membrane was changed was examined. .
- FIG. 1 is a schematic diagram showing an example of an apparatus for performing the method of the present invention.
- FIG. 2 shows a conceptual diagram of a bubble generation device.
- FIG. 3 shows a bubble diameter distribution of nanobubbles obtained in Example 1.
- FIG. 4 shows the relationship between the average pore diameter and the average bubble diameter of a porous glass membrane.
- FIG. 5 shows a relationship between a critical pressure and an average pore diameter of a porous glass membrane.
Abstract
Description
Claims
Priority Applications (2)
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US10/572,375 US7591452B2 (en) | 2003-12-15 | 2004-12-13 | Method for producing monodisperse bubbles |
EP04806919A EP1695758B1 (en) | 2003-12-15 | 2004-12-13 | Method of forming monodisperse bubble |
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JP2003416945A JP4505560B2 (ja) | 2003-12-15 | 2003-12-15 | 単分散気泡の生成方法 |
JP2003-416945 | 2003-12-15 |
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US (1) | US7591452B2 (ja) |
EP (1) | EP1695758B1 (ja) |
JP (1) | JP4505560B2 (ja) |
KR (1) | KR100852465B1 (ja) |
CN (1) | CN100450599C (ja) |
TW (1) | TW200528392A (ja) |
WO (1) | WO2005056168A1 (ja) |
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Also Published As
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US20060284325A1 (en) | 2006-12-21 |
TWI352065B (ja) | 2011-11-11 |
JP4505560B2 (ja) | 2010-07-21 |
EP1695758B1 (en) | 2012-09-26 |
EP1695758A1 (en) | 2006-08-30 |
KR20070001888A (ko) | 2007-01-04 |
US7591452B2 (en) | 2009-09-22 |
CN1894022A (zh) | 2007-01-10 |
JP2005169359A (ja) | 2005-06-30 |
KR100852465B1 (ko) | 2008-08-14 |
TW200528392A (en) | 2005-09-01 |
EP1695758A4 (en) | 2011-07-20 |
CN100450599C (zh) | 2009-01-14 |
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