JP2008093611A - Manufacturing method of water containing extremely fine air bubble and water containing extremely fine air bubble - Google Patents
Manufacturing method of water containing extremely fine air bubble and water containing extremely fine air bubble Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 42
- 239000002035 hexane extract Substances 0.000 claims abstract description 12
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003792 electrolyte Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 4
- 230000000638 stimulation Effects 0.000 abstract description 6
- 230000003292 diminished effect Effects 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 description 15
- 239000007789 gas Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- -1 hydroxyl ions Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011859 microparticle Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000816 effect on animals Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Abstract
Description
本発明は、あらゆる技術分野にその有用性が潜在する、極微小気泡を含む水の製造方法および当該方法により製造されてなる極微小気泡を含む水に関する。 The present invention relates to a method for producing water containing ultrafine bubbles, which has potential utility in all technical fields, and water containing ultrafine bubbles produced by the method.
粒径が３μｍ以下の極微小気泡には、超音波に対する非線形応答があり、また、動植物に対して優れた活性化効果があることなどが知られており、近年、その利用価値が注目されている。しかしながら、このような極微細気泡は、通常の条件で水中に発生させても極めて不安定であり、数秒のオーダーで完全溶解して消滅してしまう。本発明者らは、極微小気泡を水中で安定に存在させる方法を長年に亘って研究しており、その研究成果として、特許文献１において、水中に発生させた粒径が数十μｍの微小気泡に対し、放電や超音波照射や多孔板通過などの物理的刺激を与えることで、これを急激に縮小させる方法を提案している。しかしながら、この方法は、物理的刺激を与えるため装置設備を必要とする。従って、より簡易な方法の開発が望まれている。
そこで本発明は、物理的刺激を利用することなく、粒径が３μｍ以下の極微小気泡を安定に存在させてなる水の製造方法を提供することを目的とする。 Accordingly, an object of the present invention is to provide a method for producing water in which ultrafine bubbles having a particle size of 3 μm or less are stably present without using physical stimulation.
上記の点に鑑みてなされた本発明の粒径が３μｍ以下の極微小気泡を含む水の製造方法は、請求項１記載の通り、電気伝導度が１０μＳ／ｃｍ以上でノルマルヘキサン抽出物濃度が１００ｍｇ／Ｌ以下の水中に、粒径が５０μｍ以下の微小気泡を発生させた後、水中で自然浮遊させてその粒径を縮小させることを特徴とする。
また、請求項２記載の製造方法は、請求項１記載の製造方法において、少なくとも１分間、微小気泡を水中で自然浮遊させることを特徴とする。
また、請求項３記載の製造方法は、請求項１記載の製造方法において、微小気泡を発生させる水の電気伝導度を、電解質を加えることで調整することを特徴とする。
また、請求項４記載の製造方法は、請求項１記載の製造方法において、微小気泡を発生させる水のノルマルヘキサン抽出物濃度を、酸化剤を加えることで調整することを特徴とする。
また、本発明の粒径が３μｍ以下の極微小気泡を含む水は、請求項５記載の通り、電気伝導度が１０μＳ／ｃｍ以上でノルマルヘキサン抽出物濃度が１００ｍｇ／Ｌ以下の水中に、粒径が５０μｍ以下の微小気泡を発生させた後、水中で自然浮遊させてその粒径を縮小させることにより製造されてなることを特徴とする。
また、請求項６記載の水は、請求項５記載の水において、極微小気泡の半減期が３０分〜１５日であることを特徴とする。
In view of the above points, the method for producing water containing ultrafine bubbles having a particle size of 3 μm or less according to the present invention has a conductivity of 10 μS / cm or more and a normal hexane extract concentration as described in claim 1. A feature is that microbubbles having a particle size of 50 μm or less are generated in water of 100 mg / L or less and then naturally suspended in water to reduce the particle size.
The manufacturing method according to claim 2 is characterized in that in the manufacturing method according to claim 1, microbubbles are naturally suspended in water for at least 1 minute.
The manufacturing method according to claim 3 is characterized in that, in the manufacturing method according to claim 1, the electrical conductivity of water that generates microbubbles is adjusted by adding an electrolyte.
The manufacturing method according to claim 4 is characterized in that, in the manufacturing method according to claim 1, the normal hexane extract concentration of water generating microbubbles is adjusted by adding an oxidizing agent.
Further, the water containing ultrafine bubbles having a particle size of 3 μm or less according to the present invention, as described in claim 5, is obtained by adding particles in water having an electric conductivity of 10 μS / cm or more and a normal hexane extract concentration of 100 mg / L or less. It is produced by generating microbubbles having a diameter of 50 μm or less, and then naturally floating in water to reduce the particle size.
Further, the water according to claim 6 is characterized in that, in the water according to claim 5, the half-life of the ultrafine bubbles is from 30 minutes to 15 days.
本発明によれば、物理的刺激を利用することなく、粒径が３μｍ以下の極微小気泡を安定に存在させてなる水の製造方法を提供することができる。 According to the present invention, it is possible to provide a method for producing water in which ultrafine bubbles having a particle size of 3 μm or less are stably present without using physical stimulation.
本発明の粒径が３μｍ以下の極微小気泡を含む水の製造方法は、電気伝導度が１０μＳ／ｃｍ以上でノルマルヘキサン抽出物濃度が１００ｍｇ／Ｌ以下の水中に、粒径が５０μｍ以下の微小気泡を発生させた後、水中で自然浮遊させてその粒径を縮小させることを特徴とするものである。ある程度の水深（例えば２０ｃｍ以上）を有する水槽内や天然水域において、水の電気伝導度を１０μＳ／ｃｍ以上とし、かつ、ノルマルヘキサン抽出物濃度を１００ｍｇ／Ｌ以下とした上で、粒径が５０μｍ以下の微小気泡を発生させた後、水中で自然浮遊させると、微小気泡は、その気液界面に水中のイオン、例えば、水酸基イオン、プロトン（水素イオン）、電気伝導度の調整のために電解質を加えた場合やもともと水中に電解質が存在する場合には電解質イオンなどを濃縮させながら縮小し、ついには濃縮されたイオンが気泡を覆うことによって気泡内部の気体の溶解を抑制することで、粒径が３μｍ以下にまで縮小した気泡であっても水中で安定に存在せしめることができる。本発明の方法によって製造される粒径が３μｍ以下の極微小気泡を含む水は、動植物に対する活性化などに利用できる。 The method for producing water containing ultrafine bubbles having a particle size of 3 μm or less according to the present invention is a method for producing a microparticle having a particle size of 50 μm or less in water having an electric conductivity of 10 μS / cm or more and a normal hexane extract concentration of 100 mg / L or less. After the bubbles are generated, the particles are naturally suspended in water to reduce the particle size. In an aquarium or natural water area having a certain depth (for example, 20 cm or more), the electrical conductivity of water is 10 μS / cm or more and the normal hexane extract concentration is 100 mg / L or less, and the particle size is 50 μm. When the following microbubbles are generated and then floated naturally in water, the microbubbles will have ions in the water, such as hydroxyl ions, protons (hydrogen ions), and electrolyte to adjust the electrical conductivity at the gas-liquid interface. When the electrolyte is present in the water or when the electrolyte originally exists, it is reduced while concentrating the electrolyte ions, etc., and finally the concentrated ions cover the bubbles, thereby suppressing the dissolution of the gas inside the bubbles. Even bubbles whose diameter is reduced to 3 μm or less can be stably present in water. Water containing ultrafine bubbles having a particle size of 3 μm or less produced by the method of the present invention can be used for activation of animals and plants.
本発明において、水中に粒径が５０μｍ以下の微小気泡を発生させる方法は特段限定されるものではなく、自体公知の方法を採用することができる。例えば、気液混合物を流動下において攪拌することにより行うことができる。この場合、回転子などを利用して半径が１０ｃｍ以下の渦流を強制的に生じせしめ、壁面などの障害物や相対速度の異なる流体に気液混合物を打ち当てることにより、渦流中に獲得した気体成分を渦の消失とともに分散させることで、所望の微小気泡を大量に発生させることができる。また、２気圧以上の高圧下で気体を水中に溶解させた後、これを大気圧に開放することにより生じた溶解気体の過飽和条件から気泡を発生させることができる。この場合、圧力の開放部位において、水流と障害物を利用して半径が１ｍｍ以下の渦を多数発生させ、渦流の中心域における水の分子揺動を起因として多量の気相の核（気泡核）を形成させるとともに、過飽和条件に伴ってこれらの気泡核に向かって水中の気体成分を拡散させ、気泡核を成長させることにより、所望の微小気泡を大量に発生させることができる。なお、これらの方法によって発生した気泡群の濃度は１００個／ｍＬ以上であり、１０００個／ｍＬよりも多い値となることも稀ではない（必要であれば特開２０００−５１１０７号公報や特開２００３−２６５９３８号公報などを参照のこと）。 In the present invention, the method for generating microbubbles having a particle size of 50 μm or less in water is not particularly limited, and a method known per se can be employed. For example, it can be performed by stirring the gas-liquid mixture under flow. In this case, the gas acquired in the eddy current is generated by forcibly generating a vortex with a radius of 10 cm or less using a rotor and hitting the gas-liquid mixture against obstacles such as walls and fluids with different relative velocities. By dispersing the components together with the disappearance of the vortex, a large amount of desired microbubbles can be generated. Further, bubbles can be generated from the supersaturated condition of the dissolved gas generated by dissolving the gas in water under a high pressure of 2 atmospheres or more and then releasing the gas to atmospheric pressure. In this case, a large number of vortices with a radius of 1 mm or less are generated at the pressure release site using water flow and obstacles, and a large amount of gas phase nuclei (bubble nuclei due to water molecular fluctuations in the central region of the vortex flow. ), And by diffusing gas components in water toward these bubble nuclei along with the supersaturation condition to grow the bubble nuclei, a large amount of desired microbubbles can be generated. The concentration of the bubbles generated by these methods is 100 / mL or more, and it is not rare that the value is higher than 1000 / mL (see Japanese Patent Application Laid-Open No. 2000-51107 or specially if necessary). (See, eg, Japanese Unexamined Patent Publication No. 2003-265938).
微小気泡を発生させる水の電気伝導度は、必要に応じて電解質を加えることで調整することが望ましい。電解質としては塩化ナトリウムや塩酸や硫酸や硝酸などを使用することができる。 It is desirable to adjust the electrical conductivity of water that generates microbubbles by adding an electrolyte as necessary. As the electrolyte, sodium chloride, hydrochloric acid, sulfuric acid, nitric acid, or the like can be used.
微小気泡を発生させる水のノルマルヘキサン抽出物濃度は、必要に応じて酸化剤を加えることで調整することが望ましい。酸化剤としてはオゾンや、過マンガン酸カリウムなどの各種化合物を使用することができる。 It is desirable to adjust the normal hexane extract concentration of water that generates microbubbles by adding an oxidizing agent as necessary. As the oxidizing agent, various compounds such as ozone and potassium permanganate can be used.
本発明者らは、様々な条件下における微小気泡の特性を長年に亘って研究することにより、本発明に関して下記の知見を得た。即ち、水中に粒径が５０μｍ以下の微小気泡を発生させると、気泡の気液界面に水酸基イオンやプロトンが集積する。これは水が有している構造的な要因に関連したものであり、特に水酸基イオンが集積しやすい傾向にある。このため、ｐＨが４以上では界面自体はマイナスに帯電している（この現象についての詳細は本発明者によって公表された文献、例えば、Journal of Physical Chemistry B 109-46, pp21858-21864, ζ Potential of Microbubbles in Aqueous Solutions: Electrical Properties of the Gas-Water Interface, M. Takahashi,などを参照のこと）。ただし、電気伝導度の調整のために電解質を加えた場合やもともと水中に電解質が存在する場合、電解質の陽イオンやプロトンが静電気的な作用により界面周辺に引き寄せられて、所謂電気二重層を形成するため、帯電性は気泡周囲の極めて局所的な現象となる。このように微小気泡は水酸基イオンやプロトンおよびその周囲の電解質イオンに取り囲まれているが、これらのイオンは気泡からの気体の溶解を著しく制限するものではないため、気泡はその内部の気体を溶解させることにより表面積を急速に減少させる。これに伴う気泡粒径の減少は、ヤング・ラプラスの法則に基づいて内部の気体を強く加圧する。加圧された気体はヘンリーの法則に従って気泡周囲の水中に溶け込むため、気泡は縮小速度を上昇させながらついには水中で消滅する（この現象についての詳細は本発明者らによって公表された文献、例えば、Journal of Physical Chemistry B 107-10, pp2171-2173, Effect of Shrinking Microbubble on Gas Hydrate Formation, M. Takahashi, et.al.,などを参照のこと）。 The present inventors have obtained the following knowledge regarding the present invention by studying the characteristics of microbubbles under various conditions over many years. That is, when microbubbles having a particle size of 50 μm or less are generated in water, hydroxyl ions and protons accumulate at the gas-liquid interface of the bubbles. This is related to structural factors possessed by water, and in particular, hydroxyl ions tend to accumulate. Therefore, when the pH is 4 or more, the interface itself is negatively charged (details of this phenomenon are disclosed in the literature published by the present inventor, for example, Journal of Physical Chemistry B 109-46, pp21858-21864, ζ Potential. of Microbubbles in Aqueous Solutions: Electrical Properties of the Gas-Water Interface, M. Takahashi, etc.). However, when an electrolyte is added to adjust the electrical conductivity or when the electrolyte originally exists in water, the electrolyte's cations and protons are attracted to the periphery of the interface by electrostatic action, forming a so-called electric double layer. Therefore, the charging property is a very local phenomenon around the bubble. In this way, the microbubbles are surrounded by hydroxyl ions, protons and surrounding electrolyte ions, but these ions do not significantly limit the dissolution of the gas from the bubbles, so the bubbles dissolve the gas inside. To reduce the surface area rapidly. The accompanying reduction in the bubble particle size strongly pressurizes the internal gas based on Young's Laplace law. The pressurized gas dissolves into the water around the bubble according to Henry's law, so the bubble eventually disappears in the water while increasing the shrinkage rate (details on this phenomenon are described in the literature published by the inventors, for example, , Journal of Physical Chemistry B 107-10, pp2171-2173, Effect of Shrinking Microbubble on Gas Hydrate Formation, M. Takahashi, et.al.
今般、本発明者らは、上記の条件において気泡粒径の縮小速度が０．５μｍ／秒を超えると、気液界面の移動速度が水中における電解質イオンの拡散速度よりも有意に速くなり、逃げ切れなくなった電解質イオンが気液界面に濃縮し始めることを世界に先駆けて発見した。この気液界面におけるイオン濃度の上昇割合は気泡粒径の減少に伴って増加する傾向にあり、最終的にはイオン濃度として１００Ｍを超える極めて特異なイオン場が形成される。この場合に水中に脂質分が多いと、気液界面に有効なイオン場の形成がなされないことになる。従って、微小気泡を発生させる水のノルマルヘキサン抽出物濃度は１００ｍｇ／Ｌ以下とする。また、水中の微小気泡に対して物理的刺激が存在すると、縮小過程にある気泡の界面における圧バランスに乱れが生じて気泡が分裂し、高濃度のイオン場の形成が阻害される。そこで、水中に発生させた微小気泡は、物理的刺激を与えることなく自然浮遊させる。水中で微小気泡を自然浮遊させる時間は、少なくとも１分間であることが望ましい。こうすることで、水中の微小気泡は、気液界面に存在するイオンの熱分子運動の微妙なバランスの乱れからその一部はそのまま水中に完全溶解するものの、残りは気液界面全体に調和の取れた高濃度のイオンの殻を形成することが可能となる。高濃度のイオンの殻は、Ｓａｌｔｉｎｇ−ｏｕｔ現象により水中への気体の溶解を抑制し、その結果として、粒径が３μｍ以下の極微小気泡を水中である程度の長期に亘って安定に存在せしめることができる。この極微小気泡は、最終的には水中に完全溶解するものの、水の電解質濃度などに応じて、半減期が３０分〜１５日間程度の存在となる。 Now, when the reduction rate of the bubble particle diameter exceeds 0.5 μm / sec under the above conditions, the moving speed of the gas-liquid interface becomes significantly faster than the diffusion rate of the electrolyte ions in water, and the escape is not complete. We discovered for the first time in the world that the electrolyte ions disappeared and began to concentrate at the gas-liquid interface. The rate of increase in ion concentration at the gas-liquid interface tends to increase as the bubble particle size decreases, and an extremely unique ion field exceeding 100 M is finally formed as the ion concentration. In this case, if the water contains a large amount of lipid, an effective ion field cannot be formed at the gas-liquid interface. Therefore, the normal hexane extract concentration of water that generates microbubbles is 100 mg / L or less. In addition, when a physical stimulus is present for minute bubbles in water, the pressure balance at the interface of the bubbles in the process of shrinking is disturbed, the bubbles break up, and the formation of a high concentration ion field is inhibited. Therefore, the microbubbles generated in the water are naturally suspended without giving a physical stimulus. The time for allowing the microbubbles to naturally float in water is preferably at least 1 minute. By doing this, some of the microbubbles in the water are completely dissolved in the water as they are due to the subtle disturbance of the thermal molecular motion of ions existing at the gas-liquid interface, but the rest are in harmony with the entire gas-liquid interface. It is possible to form a shell of high-density ions taken. The high-concentration ion shell suppresses the dissolution of gas in water by the salting-out phenomenon, and as a result, microbubbles with a particle size of 3 μm or less can stably exist in water for a certain long period of time. Can do. Although these microbubbles are finally completely dissolved in water, they have a half-life of about 30 minutes to 15 days depending on the electrolyte concentration of water.
以下、本発明を実施例によって詳細に説明するが、本発明は以下の記載に限定して解釈されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is limited to the following description and is not interpreted.
実施例１：
自体公知の微小気泡発生装置（必要であれば特開２００３−２６５９３８号公報を参照のこと）を使用して、２０Ｌの容器に水道水（電気伝導度が１０μＳ／ｃｍ以上でノルマルヘキサン抽出物濃度が１００ｍｇ／Ｌ以下）を満たし、そこに４気圧の空気加圧から大気圧開放により過飽和条件を作り出して微小気泡を発生させた。微小気泡発生装置を作動中の微小気泡の粒径分布を図１に示す（計測は市販の液中パーティクルカウンターによる）。図１から明らかなように、微小気泡の粒度分布には２つのピークが認められた。なお、微小気泡を含む水は牛乳のような乳白色であった。
次に、微小気泡発生装置の作動を止め、水中の微小気泡に物理的刺激を与えることなくこれを１分間以上自然浮遊させたところ、水は透明な状況に至った。微小気泡発生装置の作動を止めてから３０分間経過後の微小気泡の粒度分布を図２に示す（計測は市販の光遮断方式の液中パーティクルカウンターによる）。図２から明らかなように、微小気泡の粒度分布には粒径が３μｍ以下の極微小気泡のピークが認められた。このピークはその後に微小気泡発生装置を再作動させることで消滅したこと、また、微小気泡発生装置の作動を止めてから３０分間経過後の水を加熱すると、過加熱状態の形成が強く抑制されたことから、水中には粒径が３μｍ以下の極微小気泡が存在することは明らかであり、本発明によれば、このような極微小気泡を安定に存在せしめた水を製造できることがわかった。
Example 1:
Using a well-known microbubble generator (see Japanese Patent Application Laid-Open No. 2003-265938 if necessary), tap water (conductivity of normal hexane extract with an electric conductivity of 10 μS / cm or more) in a 20 L container. Was 100 mg / L or less), and supersaturation conditions were created by releasing the atmospheric pressure from air pressure of 4 atm to generate microbubbles. The particle size distribution of the microbubbles operating the microbubble generator is shown in FIG. 1 (measurement is performed with a commercially available liquid particle counter). As is apparent from FIG. 1, two peaks were observed in the particle size distribution of the microbubbles. The water containing microbubbles was milky white like milk.
Next, when the operation of the microbubble generating device was stopped and the microbubbles in the water were naturally floated for 1 minute or more without giving a physical stimulus, the water became transparent. FIG. 2 shows the particle size distribution of the microbubbles 30 minutes after the operation of the microbubble generator is stopped (measurement is performed with a commercially available light-blocking liquid particle counter). As is clear from FIG. 2, a peak of extremely microbubbles having a particle size of 3 μm or less was observed in the particle size distribution of the microbubbles. This peak disappeared after the microbubble generator was restarted, and when the water was heated for 30 minutes after the microbubble generator was turned off, the formation of an overheated state was strongly suppressed. From the above, it is clear that ultrafine bubbles having a particle size of 3 μm or less exist in water, and according to the present invention, it was found that water in which such ultrafine bubbles were stably present could be produced. .
本発明は、物理的刺激を利用することなく、粒径が３μｍ以下の極微小気泡を安定に存在させてなる水の製造方法を提供することができる点において産業上の利用可能性を有する。 INDUSTRIAL APPLICABILITY The present invention has industrial applicability in that it can provide a method for producing water in which ultrafine bubbles having a particle size of 3 μm or less are stably present without using physical stimulation.
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