Bubble, bubble assembly, bubble water, oxidizing agent, reducing agent, and bubble production method

Abstract

The air bubbles (10) are air bubbles generated in the liquid, and have a PI (Isolation Point) value that varies according to a change in pH within a pH range of 3-11 of the liquid.

Description

Technical Field

[0001] The present invention relates to bubbles and aggregates of bubbles, bubble water, oxidizing agents, reducing agents, and methods for producing bubbles, which are used in various applications. Background Art

[0002] In recent years, regarding micro-nano bubbles that generate special functions in water, in order to define their properties, the diameter of the bubbles and the number per unit volume are used. In the prediction of the reactivity of these micro-nano bubbles, mainly the magnitude of the surface potential (ZETA potential) and polarities such as positive and negative are qualitatively utilized.

[0003] However, the ZETA potential shows the stability of the properties of the resulting colloid and does not directly represent the reactivity with foreign substances. In addition, it is also known that the pH itself has an impact during the generation of micro-nano bubbles, and it is difficult to distinguish the reactivity of the solution from the acidity and alkalinity of the solution itself.

[0004] For example, in Patent Document 1 below, a method for producing nano bubbles is disclosed. By applying a physical stimulus to the minute bubbles contained in a liquid, the minute bubbles are rapidly reduced in size to produce nano bubbles.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: International Publication No. 2005 / 084718 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, among the above-mentioned existing bubbles, there are the following problems.

[0010] That is, in the method for producing nano bubbles disclosed in Patent Document 1 above, there is the following problem. If the reactivity of nano bubbles is defined only by the diameter of the bubbles, pH, and surface potential, it is difficult to accurately specify nano bubbles having desired functions and effects.

[0011] In addition, when nano bubbles are applied to fields such as fresh food, cosmetics, health, and medicine, since changes in the properties of the nano bubbles after action have a great impact on the final effect, in addition to the acidity and alkalinity of the solution, it is necessary to understand the inherent values showing the reactivity of the nano bubbles and control and utilize them.

[0012] An object of the present invention is to provide bubbles and aggregates of bubbles, bubble water, oxidizing agents, reducing agents, and a method for producing bubbles that can control their performance using an index showing reactivity.

[0013] Means for Solving the Problem

[0014] The bubbles of the present invention are bubbles generated in a liquid and have PI (Isoelectric point) values that vary with the pH within the range of pH 3 to 11 of the liquid.

[0015] Effects of the Invention

[0016] According to the bubbles of the present invention, it is possible to control their performance using an index showing reactivity. Description of the Drawings

[0017] Figure 1 It is a diagram showing nano - bubbles of one embodiment of the present invention.

[0018] Figure 2A It is a diagram showing the diameter and number distribution of nano - bubbles when the pH value is around 5.8 after just stopping the circulation, where the water is circulated by a pump and nano - bubbles are generated by controlling the water flow, etc.

[0019] Figure 2B It shows Figure 2A a diagram of the diameter and number distribution of nano - bubbles when the pH value of the bubble water containing nano - bubbles changes and the pH value is around 4.8.

[0020] Figure 2C It is a diagram showing the diameter and number distribution of nano - bubbles when the pH value is around 4.1.

[0021] Figure 3A It is a diagram showing the diameter and number distribution of nano - bubbles when the pH value is around 3.1.

[0022] Figure 3B It is a diagram showing the diameter and number distribution of nano - bubbles when the pH value is around 6.1.

[0023] Figure 3C It is a diagram showing the diameter and number distribution of nano - bubbles when the pH value is around 9.9.

[0024] Figure 4A It shows Figure 2A a diagram of the ZETA potential of nano - bubbles when the pH value is around 5.8.

[0025] Figure 4B It shows Figure 2A a diagram of the ZETA potential of nano - bubbles when the pH value is around 4.8.

[0026] Figure 4C It shows Figure 2A a diagram of the ZETA potential of nano - bubbles when the pH value is around 4.1.

[0027] Figure 5A It shows Figure 3A a graph of the ZETA potential of nanobubbles when the pH value is around 3.1.

[0028] Figure 5B It shows Figure 3B a graph of the ZETA potential of nanobubbles when the pH value is around 6.1.

[0029] Figure 5C It shows Figure 3C a graph of the ZETA potential of nanobubbles when the pH value is around 9.9.

[0030] Figure 6 It shows Figure 1 a graph of the relationship between the pH value of bubble water containing nanobubbles and the ZETA potential of the nanobubbles.

[0031] Figure 7 It shows Figure 6 in the graph of, the situation where the PI value changes when the pH value of bubble water containing nanobubbles is changed to reverse the ZETA potential by ± and then the pH value is changed in the reverse direction.

[0032] Figure 8 It shows Figure 1 a flowchart of the processing procedure for the manufacturing method of nanobubbles.

[0033] Figure 9A It shows a graph of the diameter and number distribution of nanobubbles when the pH value is around 5.540 just after the generation of nanobubbles is stopped by controlling water flow, etc.

[0034] Figure 9B It shows Figure 9A a graph of the diameter and number distribution of nanobubbles when the pH value of bubble water containing nanobubbles is changed in the increasing direction and the pH value is around 6.642.

[0035] Figure 9C It shows a graph of the diameter and number distribution of nanobubbles when the pH value is around 7.596.

[0036] Figure 10A It shows a graph of the diameter and number distribution of nanobubbles when the pH value is around 8.846.

[0037] Figure 10B It shows a graph of the diameter and number distribution of nanobubbles when the pH value is around 6.812.

[0038] Figure 10C It shows a graph of the diameter and number distribution of nanobubbles when the pH value is around 5.404.

[0039] Figure 11A It is a graph showing the ZETA potential of nanobubbles when the pH value is around 5.540 just after the circulation of nanobubble generation stops due to the control of water flow or the like.

[0040] Figure 11B It is to make Figure 11A The pH value of the bubble water containing nanobubbles changes in the increasing direction, and it is a graph of the ZETA potential of the nanobubbles when the pH value is around 6.642.

[0041] Figure 11C It is a graph showing the ZETA potential of nanobubbles when the pH value is around 7.596.

[0042] Figure 12A It is a graph showing the ZETA potential of nanobubbles when the pH value is around 8.846.

[0043] Figure 12B It is a graph showing the ZETA potential of nanobubbles when the pH value is around 6.812.

[0044] Figure 12C It is a graph showing the ZETA potential of nanobubbles when the pH value is around 5.404.

[0045] Figure 13 It is to show that when the pH value of the bubble water containing nanobubbles having the Figures 11A to 12C shown ZETA potential changes in the increasing direction, and after the pH value reaches 9.0, the situation where the PI value obtained by changing the pH value in the reverse direction changes for the generation of nanobubbles. Detailed implementation mode

[0046] Hereinafter, the implementation mode will be described in detail with reference to the drawings as appropriate. However, detailed descriptions that are unnecessary may be omitted. For example, detailed descriptions of known matters or repeated descriptions of substantially the same configurations may sometimes be omitted. This is to avoid the following description from being too long and to facilitate understanding by those skilled in the art.

[0047] In addition, the applicant provides the drawings and the following description for those skilled in the art to fully understand the present invention, and the intention is not to limit the subject matter described in the scope of the patent claims thereby.

[0048] (Embodiment 1)

[0049] Regarding the bubbles of one embodiment of the present invention, if Figures 1 to 13 is used for description, it is as follows.

[0050] The bubble 10 of the present embodiment is, for example, a charged bubble contained in water (liquid), such asFigure 1 As shown, for example, it contains nanobubbles having a diameter in the range of 50 to 1000 nm. Moreover, the bubbles 10 disappear in water within several hours to several weeks through processes such as "rising", "shrinking", and "crushing", and produce effects corresponding to such usage purposes as cleaning, sterilization, and deodorization.

[0051] In addition, the bubble water (liquid) containing the bubbles 10 can use, for example, distilled water, ultrapure water, etc. Also, as the liquid containing the bubbles 10, in addition to distilled water and ultrapure water, an aqueous liquid containing an aqueous solution in which the ionic product of water holds can also be used.

[0052] When the bubbles 10 of this embodiment are negative or have a negative Zeta potential at the time of generation, for example, they are generated from bubbles with a diameter of 50 to 1000 nm by using a device (such as a rotor of a screw, etc.) that circulates water with an ordinary pump and controls the water flow. At this time, the bubble water containing the bubbles 10 just after stopping the circulation of the pump absorbs carbon dioxide (CO2) in the air, etc., and its pH value changes.

[0053] Here, in this embodiment, after the pH value of the bubble water stabilizes (for example, left standing for about 20 minutes), 0.01N HCl (cation) and 0.01N KOH (anion) are dropped, and the pH value of the bubble water changes. Then, for the bubble water collected after the pH value stabilizes, the particle size of the bubbles 10 and the Zeta potential of the bubbles 10 are measured by dynamic light scattering (DLS (Dynamic Light Scattering)), etc.

[0054] That is, the bubbles 10 of this embodiment are generated, for example, in the following manner. After the pH value of the bubble water containing bubbles generated by circulating ultrapure water with a pump and controlling the water flow stabilizes, as described above, a cation (positively charged ion) and an anion (negatively charged ion) are dropped to change the pH value of the bubble water toward the negative side or the positive side (the first direction) until the Zeta potential of the bubbles is reversed ±. Then, the bubbles 10 become bubbles with different PI values (isoelectric points) before and after the Zeta potential is reversed ±.

[0055] Also, the diameter of the bubbles 10 is calculated using the following Stokes-Einstein formula. Also, the diffusion coefficient D is determined by the analysis of the autocorrelation function.

[0056]

Formula 1

[0057]

[0058] (where D H: Hydrodynamic diameter, D: Diffusion coefficient, k: Boltzmann constant, T: Temperature (K), η: Viscosity

[0059] Dynamic light scattering (DLS) is a method for precisely measuring the microparticles contained in suspensions and emulsions. Based on Brownian motion (small particles move rapidly and large particles move slowly), it can measure, for example, particle sizes of several μm, Zeta potential, and molecular weight.

[0060] In addition, in dynamic light scattering (DLS), a laser is irradiated onto the particles undergoing Brownian motion, and the scattered light signal at a certain angle is detected. The scattered light is analyzed as the intensity (fluctuation) of light corresponding to the particle size or the change in frequency, and the frequency analysis is performed in the frequency range of 1 Hz to 100 kHz.

[0061] As a method for measuring the behavior of bubbles, in addition to dynamic light scattering (DLS), particle trajectory analysis, laser diffraction scattering method, electrical sensing zone method, resonant mass measurement method, dynamic image analysis method, etc. can also be used.

[0062] In addition, the Zeta potential of the bubble 10 can be measured, for example, by electrophoresis. In electrophoresis, when an electric field is applied to the charged particles floating in the electrolyte solution, the charged particles move toward the electrode with the opposite polarity to the surface charge at a certain speed. Thus, the following Henry's formula can be applied to measure the Zeta potential of the bubble. Also, the mobility of the charged particles is determined by the Doppler shift.

[0063]

Formula 2

[0064]

[0065] (where U E : Electrophoretic mobility, z: Zeta potential, ε: Dielectric constant, η: Viscosity, F(ka): Henry constant)

[0066] The so-called PI value (isoelectric point) means that in amphoteric electrolytes such as amino acids or proteins, when the hydrogen ion concentration of the solution changes, the positive and negative charges of the solute particles as a whole are 0, and the particles do not move even when an electric field is applied. In other words, the so-called PI value (isoelectric point) is the pH value at which the charge (effective charge) of the solute and particles as a whole becomes 0 when the hydrogen ion concentration (pH) of the solution changes in amphoteric electrolytes or colloids such as amino acids, peptides, and proteins.

[0067] More specifically, Figure 2A The data shown is the backscattering (bubble diameter and its quantity (%)) after the pump has just stopped circulating (the pH value of the bubble water is about 5.8).

[0068] Also, Figures 2A to 3C The three lines in the figure of Figures 2A to 3C are the respective measurement results of three consecutive measurements. Additionally, Figures 2A to 3C In the figure of Figures 2A to 3C , the horizontal axis represents the diameter of the observed particles (bubbles), and the vertical axis represents the quantity thereof (% ).

[0069] Figure 2B Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N HCl (cation) is dropped into the bubble water shown in Figure 2A to lower the pH value to around 4.8 (shift to the acidic side). Figure 2A Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N HCl (cation) is further dropped into the bubble water shown in Figure 2A to lower the pH value to around 4.1 (shift to the acidic side).

[0070] Figure 2C Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N HCl (cation) is further dropped into the bubble water shown in Figure 2B to lower the pH value to around 3.1 (shift to the acidic side). Figure 2B Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is dropped into the bubble water shown in Figure 2C to raise the pH value to around 6.2 (shift to the alkaline side).

[0071] Figure 3A Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in Figure 3A to raise the pH value to around 9.9 (shift to the alkaline side). Figure 2C Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in Figure 3A to raise the pH value to around 9.9 (shift to the alkaline side).

[0072] Figure 3B Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is dropped into the bubble water shown in Figure 3A to raise the pH value to around 6.2 (shift to the alkaline side). Figure 3A Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is dropped into the bubble water shown in Figure 3A to raise the pH value to around 6.2 (shift to the alkaline side).

[0073] Figure 3C Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in Figure 3B to raise the pH value to around 9.9 (shift to the alkaline side). Figure 3B Shows the data of the backscattering (bubble diameter and its quantity (%)) in a stabilized state when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in Figure 3B to raise the pH value to around 9.9 (shift to the alkaline side).

[0074] According to Figures 2A to 3C In the figure shown in Figures 2A to 3C , as a result of the change from the state where nanobubbles are generated by the circulation of ultrapure water using a pump, to dropping a cation (positively charged ion) to lower the pH value and then dropping an anion (negatively charged ion) to raise the pH value, in the pH range of 3.0 to 10.0, nanobubbles in the range of 60 to 200 nm can be observed, and the scattering intensity is also generally constant.

[0075] From these observation results, it can be seen that the nanobubbles are in a generally stable state within the pH range of 3.0 to 10.0.

[0076] Next, as Figures 2A to 3C shown, the measurement results of the ZETA potential of the bubble 10 when the pH value of the bubble water containing the bubble 10 is changed in a manner of first decreasing (the first direction) and then increasing (the second direction) are shown in Figures 4A to 5C .

[0077] Also, Figures 4A to 5C in the figure of, the horizontal axis represents the elapsed time (s) after applying a voltage to the electrode part, and the vertical axis represents the mobility (phase (rad)) of the bubble 10 that moves due to electrophoresis in the bubble water. In addition, Figures 4A to 5C the figure of shows the data of measuring the behavior of the bubble 10 three times continuously.

[0078] Figure 4A It shows that the ZETA potential of the bubble 10 is negative immediately after the pump circulation stops (the pH value of the bubble water is about 5.8).

[0079] Figure 4B It shows Figure 4A the case where the ZETA potential of the bubble 10 in the stabilized state is negative when the above-mentioned 0.01N HCl (cation) is dropped into the bubble water shown in to lower the pH value to about 4.8 (move to the acidic side).

[0080] Figure 4C It shows Figure 4B the case where the ZETA potential of the bubble 10 in the stabilized state is replaced with a positive value when the above-mentioned 0.01N HCl (cation) is further dropped into the bubble water shown in to lower the pH value to about 4.1 (move to the acidic side).

[0081] In other words, it can be seen that for the bubble 10 of the present embodiment, if the pH value of the bubble water is lowered, the ZETA potential changes from negative to positive during the change of the pH value from 4.8 to 4.1. Therefore, the PI value (isoelectric point) of the bubble 10 is between 4.1 and 4.8 in terms of pH value.

[0082] Figure 5A It shows Figure 4C the case where the ZETA potential of the bubble 10 in the stabilized state is positive when the above-mentioned 0.01N HCl (cation) is further dropped into the bubble water shown in to lower the pH value to about 3.1 (move to the acidic side).

[0083] Figure 5B It shows Figure 5AThe bubble water shown is such that when the above-mentioned 0.01 N KOH (anion) is dropped and the pH value is raised to around 6.2 (moved toward the alkaline side), the ZETA potential of the bubbles 10 in the stabilized state is converted to negative again.

[0084] In other words, it can be seen that for the bubbles 10 of the present embodiment, if the pH value of the bubble water is first decreased and then increased, during the change of the pH value from 3.1 to 6.2, the ZETA potential that has been converted to positive is converted to negative again. Therefore, the PI value (isoelectric point) of the bubbles 10 is between pH values 3.1 and 6.2.

[0085] Figure 5C It shows the case where Figure 5B In the bubble water shown, when the above-mentioned 0.01 N KOH (anion) is further dropped to raise the pH value to around 9.9 (moved toward the alkaline side), the ZETA potential of the bubbles 10 in the stabilized state is negative.

[0086] Figure 6 It shows a graph Figures 4A to 5C showing the relationship between the pH value of the bubble water containing nanobubbles and the ZETA potential of the nanobubbles when the pH value of the bubble water containing the bubbles 10 is first decreased (moved toward the acidic side) and then increased (moved toward the alkaline side) as shown.

[0087] Also, in Figure 6 and Figure 7 In the figure, PB1, PB2, and PB3 show the measurement results of the bubbles generated three times using a pump.

[0088] For the bubbles 10 of the present embodiment, as Figure 6 shown, it can be seen that if the pH value of the bubble water containing the bubbles 10 is changed, the ZETA potential of the bubbles 10 also changes.

[0089] Figure 7 It is a figure Figure 6 showing, according to the change of the ZETA potential of the bubbles 10 when the pH value of the bubble water containing the bubbles 10 is first decreased and then increased, the generation process of the bubbles 10 with different PI values.

[0090] That is, for the bubbles 10 of the present embodiment, as Figure 7 shown, after the pH value of the bubble water containing nanobubbles (ZETA potential is negative) generated by circulating water with a pump or the like and controlling the water flow is stabilized near 6.0, if the pH value is decreased (refer to the dotted arrow), the ZETA potential of the bubbles 10 becomes 0 in the range of pH values 4.0 to 5.0, and if the pH value is further decreased, it is reversed from negative to positive. That is, the PI value of the bubbles 10 at this time is 4.0 to 5.0.

[0091] Thereafter, from the state where the Zeta potential is reversed to positive, as Figure 7 shown, if the pH value of the bubble water is increased (refer to the single-dotted arrow), the Zeta potential of the bubble 10 gradually decreases and becomes 0 between pH values of 6.0 and 7.0. If the pH value is further increased, it is reversed to negative again. That is, the PI value of the bubble 10 at this time is 6.0 to 7.0.

[0092] Based on the above, for the bubble 10 of the present embodiment, first decrease the pH value of the bubble water. After the Zeta potential is reversed from negative to positive, if the pH value of the bubble water is increased, the Zeta potential is reversed from positive to negative.

[0093] That is, for the bubble 10, the PI value (the first PI value = about 4.0) when the pH value of the bubble water is decreased is different from the PI value (the second PI value = 6.7) when the pH value of the bubble water is increased after the Zeta potential is reversed from negative to positive.

[0094] Accordingly, after the bubble is generated, if the pH value is changed in a specified direction (negative side or positive side) (the first direction) until the ± of the Zeta potential of the bubble 10 is reversed, and then changed in the direction opposite to the specified direction (positive side or negative side) (the second direction), bubbles 10 with different PI values can be obtained.

[0095] Thus, by changing the pH of the bubble water, bubbles 10 with a desired PI value are synthesized. If the PI value is considered as one of the indexes for showing the reactivity of the bubble 10, bubbles 10 that can be used for a desired purpose (cleaning, sterilization, deodorization, other uses) can be generated.

[0096] In addition, the Zeta potential of the bubble 10 at the time of generation (the pH value of the bubble water is around 6.0) is negative. However, if the pH value is changed in a specified direction (negative side or positive side) (the first direction) until the ± of the Zeta potential of the bubble 10 is reversed, and then changed in the direction opposite to the specified direction (positive side or negative side) (the second direction), bubbles 10 with a positive Zeta potential can be obtained around the same pH value of 6.0.

[0097] That is, even if the pH of the bubble water is the same 6.0, before and after the pH value is changed until the Zeta potential is reversed by ±, bubbles 10 that respond from negatively charged bubbles to positively charged bubbles can be obtained.

[0098] From the above, it can be seen that in the present embodiment, as Figure 7 shown, in the range where the pH value of the bubble water (liquid) is 3 to 11 (preferably 4.0 to 10.0), bubbles 10 with different PI values depending on the change in pH can be obtained.

[0099] Further, in the present embodiment, by reducing the pH value of the bubble water containing the nanobubbles generated by circulating ultrapure water with a pump and controlling the water flow or the like until the ZETA potential of the bubbles 10 is reversed and then increasing the pH value, it is possible to synthesize bubbles 10 with different PI values.

[0100] Conversely, when the pH value of the bubble water containing the generated nanobubbles is increased until the ZETA potential of the bubbles 10 is reversed (from positive to negative) and the ZETA potential becomes 0 (the pH value is around 11.0), similar to the case of reducing the pH value, it is possible to synthesize bubbles 10 with different PI values.

[0101] Specifically, Figure 9A Data of backscattering (the diameter of the bubbles and their number (%)) immediately after the control of the water flow or the like is stopped (the pH value of the bubble water is around 5.540) is shown.

[0102] Further, Figures 9A to 10C The three lines in the figure of are the measurement results of each of the three consecutive measurements. Additionally, Figures 9A to 10C In the figure of, the horizontal axis represents the diameter of the observed particles (bubbles), and the vertical axis represents their number (%).

[0103] Figure 9B Data of backscattering (the diameter of the bubbles and their number (%)) in a stabilized state is shown when the above-mentioned 0.01N KOH (anion) is dropped into the bubble water shown in to increase the pH value to around 6.642 (shift to the alkaline side). Figure 9A

[0104] Figure 9C Data of backscattering (the diameter of the bubbles and their number (%)) in a stabilized state is shown when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in to increase the pH value to around 7.596. Figure 9B

[0105] Figure 10A Data of backscattering (the diameter of the bubbles and their number (%)) in a stabilized state is shown when the above-mentioned 0.01N KOH (anion) is further dropped into the bubble water shown in to increase the pH value to around 8.846. Figure 9C

[0106] Figure 10B Data of backscattering (the diameter of the bubbles and their number (%)) in a stabilized state is shown when the above-mentioned 0.01N HCl (cation) is dropped into the bubble water shown in to reduce the pH value to around 6.812 (shift to the acidic side). Figure 10A

[0107] Figure 10C Data of backscattering (the diameter of the bubbles and their number (%)) in a stabilized state is shown when the above-mentioned 0.01N HCl (cation) is dropped into the bubble water shown in to reduce the pH value to around 6.812 (shift to the acidic side).Figure 10B In the shown sparkling water, the 0.01 N HCl (cation) mentioned above was further dropped to lower the pH value to about 5.404, and the data of backscattering (bubble diameter and its quantity (%)) in the stabilized state.

[0108] According to Figures 9A to 10C the shown figure, the result after the change in the manner that from the state where nanobubbles are generated by controlling water flow, etc., to the state where the pH value is increased by dropping anions (negatively charged ions) and then decreased by dropping cations (positively charged ions) is that in the range of pH value from 5.0 to 9.0, nanobubbles in the range of 10 to 250 nm can be observed and the scattering intensity is also generally constant.

[0109] From this observation result, it can be known that the nanobubbles are in a generally stable state in the range of pH value from 5.0 to 9.0.

[0110] Next, as Figures 9A to 10C shown, the measurement result of the ZETA potential of the bubble 10 when the pH value of the sparkling water containing the bubble 10 is changed in the manner of first increasing and then decreasing is shown in Figures 11A to 12C .

[0111] Also, Figures 11A to 12C in the figure, the horizontal axis represents the elapsed time (s) after applying voltage to the electrode part, and the vertical axis represents the mobility (phase (rad)) of the bubble 10 moving by electrophoresis in the sparkling water. In addition, Figures 11A to 12C the data of measuring the behavior of the bubble 10 three times continuously is shown in the figure.

[0112] Figure 11A It shows the case where the ZETA potential of the bubble 10 is positive (average 8.47) just after the control of water flow, etc. stops (the pH value of the sparkling water is about 5.540).

[0113] Figure 11B It shows that Figure 11A in the shown sparkling water, when the above-mentioned 0.01 N KOH (anion) is dropped to raise the pH value to about 6.642 (move to the alkaline side), the ZETA potential of the bubble 10 in the stabilized state changes from positive to negative.

[0114] Figure 11C It shows that Figure 11B in the shown sparkling water, when the above-mentioned 0.01 N KOH (anion) is further dropped to raise the pH value to about 7.596, the negative value of the ZETA potential of the bubble 10 in the stabilized state becomes larger.

[0115] Figure 12A It shows that Figure 11CIn the bubble water shown, when the above-mentioned 0.01N KOH (anion) is further dropped to raise the pH value to about 8.846, the negative value of the ZETA potential of the bubbles 10 in the stabilized state further increases.

[0116] Figure 12B It shows dropping into Figure 12A In the bubble water shown, when the above-mentioned 0.01N HCl (cation) is dropped to lower the pH value to about 6.812 (shift to the acidic side), the negative value of the ZETA potential of the bubbles 10 in the stabilized state becomes smaller.

[0117] Figure 12C It shows dropping into Figure 12B In the bubble water shown, when the above-mentioned 0.01N HCl (cation) is further dropped to lower the pH value to about 5.404, the negative value of the ZETA potential of the bubbles 10 in the stabilized state becomes smaller.

[0118] In other words, for the bubbles 10 of the present embodiment, as Figure 13 shown, if the pH value of the bubble water is first raised to around pH 9.0 and then lowered, when the pH value changes from around 6.0 to around 9.0 and then to around 5.0, the PI value (isoelectric point) of the bubbles 10 changes from the range of pH values 6.0 - 7.0 (first isoelectric point) to around pH 5.0 (second isoelectric point).

[0119] Based on the above, in the present embodiment, as Figure 13 shown, in the range of pH values 3 - 11 (preferably 5.0 - 9) of the bubble water (liquid), the ZETA potential is positive just after the bubbles 10 are generated. From this point, if the pH value is increased (first direction), the ZETA potential becomes negative. After reaching around a specified value (pH 9.0) and then lowering it (second direction), by changing the pH in this way, bubbles 10 with different PI values (from about 6.0 - 7.0 to about 5.0) can be synthesized.

[0120] <Manufacturing method of bubbles 10>

[0121] If Figure 8 the manufacturing method of the bubbles 10 of the present embodiment is described, it is as follows.

[0122] That is, for the above-mentioned bubbles 10, as Figure 8 shown, in step S11, for example, when generating bubbles with a negative ZETA potential just after generation, by circulating ultrapure water with a pump and controlling the water flow, etc., nanobubbles are generated in the ultrapure water.

[0123] Further, in the present embodiment, ultrapure water is used as the liquid containing the bubbles 10, but the present invention is not limited thereto, and tap water, alkaline ionized water, or other aqueous solutions containing anions and cations may be used instead of ultrapure water.

[0124] Next, in step S12, the pH of the bubble water is changed in the negative direction (the first direction) until the sign of the ZETA potential of the bubbles 10 is reversed by reaching the pH value corresponding to the first PI value (the first isoelectric point).

[0125] Further, in the present embodiment, the change in the pH value of the bubble water is achieved by changing the balance between anions and cations containing H+ and OH− in the bubble water.

[0126] Then, in step S13, from the state where the sign of the ZETA potential of the bubbles 10 is reversed, the pH of the bubble water is changed in the positive direction (the second direction) opposite to the negative direction.

[0127] Next, in step S14, before and after changing the pH value of the bubble water until the sign of the ZETA potential of the bubbles 10 is reversed, bubbles with different PI values (the first PI value, the second PI value (the second isoelectric point)) are generated.

[0128] In the present embodiment, as described above, as a method for defining the reactivity of nano-bubbles, by introducing the PI value as a new index, the range of nano-bubbles having the desired functions and effects required for household appliances such as refrigerators, washing machines, dishwashers, and facial steamers can be specifically explained.

[0129] Here, different from the pH of the solution containing nano-bubbles, it is distinguished as follows: nano-bubbles with a PI value in an acidic region far less than pH 7 are "acidic nano-bubbles", those far greater than pH 7 are "alkaline nano-bubbles", and those near pH 7 are "neutral nano-bubbles".

[0130] As a specific example of its use, by generating alkaline nano-bubbles having a PI value (isoelectric point) at pH 10 in an aqueous solution at pH 6, nano-bubbles showing reactivity in the alkaline region can be generated in a neutral medium.

[0131] Thus, nano-bubble water in the neutral region is easier to handle than acidic and alkaline ones, so high safety and functionality can be achieved simultaneously.

[0132] In addition, in the present embodiment, as described above, as a method for defining the reactivity of nano-bubbles, by introducing the PI value as a new index, the range of nano-bubbles having the desired functions and effects required for oxidants and reductants can be specifically explained.

[0133] For example, among amino acids and the like, it is generally known that amino acids with a large PI value have electron-donating properties, and amino acids with a small PI value have electron-withdrawing properties.

[0134] Therefore, the nanobubbles controlled by the PI value of the present invention can be utilized as an oxidizing agent or a reducing agent by controlling the PI value.

[0135] In addition, the oxidizing agent described herein receives electrons from the substance that causes the nanobubbles to act (react, come into contact). Further, the reducing agent described herein provides electrons to the substance that causes the nanobubbles to act (react, come into contact).

[0136] [Other Embodiments]

[0137] As described above, one embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the disclosure.

[0138] (A)In the above embodiment, the manner in which the bubble 10 exists as a monomer in water has been described. However, the present invention is not limited thereto.

[0139] For example, it may also be a form in which an aggregate formed by combining a plurality of bubbles exists in water.

[0140] In this case, by controlling under the above conditions, even in the form of an aggregate of bubbles formed by combining a plurality of bubbles, the same effects as those obtained in the above embodiment can be obtained.

[0141] (B)In the above embodiment, in order to change the pH value of the bubble water containing the bubble 10, an example of changing the balance between anions (KOH) and cations (HCl) containing H+ and OH− has been described. However, the present invention is not limited thereto.

[0142] For example, the pH value of the bubble water may also be changed by electrolysis of the bubble water.

[0143] (C)In the above embodiment, in order to change the pH value of the bubble water containing the bubble 10, an example of changing the balance between anions (KOH) and cations (HCl) containing H+ and OH− has been described. However, the present invention is not limited thereto.

[0144] For example, acidic and basic solutions may also be used to change the pH value of the bubble water.

[0145] (D)In the above embodiment, the bubble 10 of the present invention has been described. However, the present invention is not limited thereto.

[0146] For example, as a bubble water having the bubbles of the present invention and water containing the bubbles, the present invention can also be realized.

[0147] (E) In the above embodiment, as the initial stage of generating the bubbles 10 of this embodiment, ultrapure water is circulated using a general pump and the water flow is controlled to generate bubble water containing nanobubbles having a negative zeta potential immediately after generation. However, the present invention is not limited to this.

[0148] For example, the generation of nanobubbles whose zeta potential is negative immediately after generation is not limited to the circulation of ultrapure water by a pump and the control of the water flow, and may be performed by various devices for generating nanobubbles.

[0149] Similarly, the generation of nanobubbles having a positive zeta potential immediately after generation is not limited to the control of water flow or the like, and may be performed by various devices for generating nanobubbles.

[0150] Industrial Applicability

[0151] The bubbles of the present invention achieve an effect of being able to control their performance using an index showing reactivity, and thus can be widely applied to water, gas, and the like containing bubbles.

[0152] Attached Marking Description

[0153] 10 bubbles

Claims

1. A bubble, which is a bubble generated in a liquid and has an isoelectric point (PI value) that varies with the change in pH within the range of 3 to 11 of the pH of the liquid.

2. The bubble according to claim 1, wherein, When the pH value of the liquid is changed until the ± of the ZETA potential of the bubble is reversed, different PI values are present before and after the reversal.

3. The bubble according to claim 1 or 2, wherein, Within the range of 4 to 10 of the pH value of the liquid, the PI value varies with the change in pH.

4. The bubble according to claim 1 or 2, which has a diameter in the range of 50 nm to 1000 nm.

5. An aggregate of bubbles, which has a plurality of the bubbles according to claim 1 or 2.

6. A bubble water, which comprises: the bubbles according to claim 1 or 2; and an aqueous liquid containing the bubbles.

7. An oxidizing agent, which comprises: the bubbles according to claim 1 or 2; and an aqueous liquid containing the bubbles, wherein the oxidizing agent receives electrons from a substance on which the bubbles act.

8. A reducing agent, which comprises: the bubbles according to claim 1 or 2; and an aqueous liquid containing the bubbles, wherein the reducing agent provides electrons to a substance on which the bubbles act.

9. A method for manufacturing bubbles, wherein, comprises the following steps: a step of generating bubbles in a liquid; a step of changing the pH of the liquid in a first direction until the ± of the ZETA potential of the bubble is reversed by reaching a pH value corresponding to a first PI value; a step of, starting from the state where the ± of the ZETA potential has been reversed, changing the pH of the liquid in a second direction opposite to the first direction to generate bubbles having a second PI value different from the first PI value.

10. The method for manufacturing air bubbles according to claim 9, wherein, In the liquid, the pH of the liquid is changed by varying the balance between anions and cations containing H+ and OH-.

11. The method for manufacturing bubbles according to claim 9, wherein, In the liquid, acidic and basic solutions are used to change the pH of the liquid.

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