CN1434281A - Method for forming nano air bubble on hydrophilic plain surface based on alcohol water replacement - Google Patents
Method for forming nano air bubble on hydrophilic plain surface based on alcohol water replacement Download PDFInfo
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- CN1434281A CN1434281A CN 03115380 CN03115380A CN1434281A CN 1434281 A CN1434281 A CN 1434281A CN 03115380 CN03115380 CN 03115380 CN 03115380 A CN03115380 A CN 03115380A CN 1434281 A CN1434281 A CN 1434281A
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Abstract
The invention is a method of forming nano air-bubble on the hydrophilic plain surface based on the substitution of alcohol and water, adopting the hydrophilic level automic-grade plain mica as the base, the temperature of the liquid above 15 deg.C, and below 40 deg.C, injecting the alcohol at first and then the water, and using the process of the substitution of alcohol and water to form the nano bubble on the interface of the base and the water. The alcohols include methyl alcohol, ethanol and so on.
Description
Technical field:
The present invention relates to a kind ofly replace in method hydrophilic, that even curface forms nano bubble based on pure water, specifically, be a kind of on mica substrate, can form the method for nano bubble after being replaced by water with the alcohol (comprising methyl alcohol, ethanol, n-propanol, isopropyl alcohol and the tert-butyl alcohol) that water dissolves each other on the interface of substrate and water, the nano bubble that belongs to solid-liquid interface in the physical chemistry forms technical field.
Background technology:
No matter in the fundamental research field or in application branch of learning, the nano bubble of solid-liquid interface all is a problem that receives much attention.According to classical thermodynamics, the volume of bubble is more little, and pressure inside is just big more, and the big bubble that must cause of pressure breaks.In theory, nano bubble can not stable existence in the water under the room temperature.But have several seminar to observe directly the nano bubble of solid-liquid interface with atomic force microscope (AFM) in recent years, this existence for nano bubble provides evidence.Because the nano bubble size is little very easily destroyed again, be difficult to arrive with optical means and contact instrument visual inspection.The advantage of atomic force microscope is can be in imaging under the solution state, and obtains nano level resolution.Therefore especially the pattern of rapping of AFM is very suitable for the research of soft sample, is the powerful measure of surveying the solid-liquid interface nano bubble at present.
The existence of nano bubble has caused the very big concern of physical chemistry, Surface Science, colloidal chemistry and other subject after obtaining proof.The nano bubble of solid-liquid interface may be relevant with effect with a lot of phenomenons, to the viscous effect of motion solid, the gathering of solid-liquid interface, the flotation and the sedimentation of micelle, even all there is confidential relation the aspects such as stability of protein structure as the interaction between colloidal particle and solid surface, moistened surface, surface adhesion, liquid.Want system, in depth study nano bubble, must set up a kind of easy, repeatable strong method formation nano bubble earlier.Except that this group, nano bubble (J.W.G., Yyrrell and P.Attard, Phys.Rev.Lett.2001 directly study on water-immersed chemical modification surface in other seminar at present; 87, P176104.N.Ishida, M.Sakamoto, M.Miyara andK.Higashitani, Langmuir 2000; 16, P5681.).The surface of this chemical modification is subjected to the influence of concrete modification, must cause the inhomogeneity of surface physics or chemical property, a large amount of gases that this heterogeneity surface is easy to adsorb in air.These adsorbed gases make may not carry out quantitative examination to the nano bubble of solid-liquid interface, and, also can't realize the repeatability of result of study.Also have cavitation phenomenon at hydrophobic surface, this makes systematically, in depth studies nano bubble and seems difficult more.
Hydrophilic, smooth solid surface can not adsorb a large amount of gases from air, the steam that does not yet have cavitation phenomenon to produce.With this surface is that substrate research nano bubble can be avoided this two kinds of uncertainties that factor causes.But in theory, hydrophilic, even curface is can not adsorb bubble.Therefore, it is significant for the research of nano bubble to set up on a kind of surface hydrophilic, atomically flating the method that forms nano bubble.
This group adopts pure water to replace formation nano bubble (S.T.Lou, Z.Q.Ouyang, Y.Zhang, X.J.Li, J.Hu, M.Q.Li and F.J.Yang, J.Vac.Sci.Technol.B, 2000 early stage; 18, P2573.S.T.Lou, J.X.Gao, X.D.Xiao, G.L.Li, Y.Zhang, M.Q.Li, J.L.Sun, J.Hu, Chin.Phys.2001,10 (Suppl) P1009.S.T.Lou, J.X.Gao, X.D.Xiao, X.J.Li, G.L.Li, Y.Zhang, M.Q.Li, J.L.Sun, X.H.Li and J.Hu, Mater.Charact.2002; 48, P211), but do not have the controlling liquid temperature, and usefulness is that 5% ethanolic solution is replaced ethanol, therefore can't form nano bubble in repeated highland.
Summary of the invention:
The objective of the invention is at the deficiencies in the prior art, a kind of method that forms nano bubble at hydrophilic even curface is provided.This method is suitable for atomic force microscope AFM nano bubble being observed, and is easy and simple to handle, can not introduce pollution, and has fine reappearance, can be used as the basis of nano bubble being goed deep into systematic study.
For realizing such purpose, it is substrate that the present invention adopts mica hydrophilic, atomically flating, injects earlier the alcohol water that reinjects, and utilizes the replacement process of alcohol and water, forms nano bubble on the interface of substrate and water.
The present invention specifically comprises the steps: the preparation of (1) instrument
Atomic force microscope is that (Digital Instruments Inc.), is equipped with O-circle and liquid bath in NanoScope IIIa SPM system." E " scanner head; Elasticity coefficient is the common NP needle point about 0.58N/m.Needle point water, ethanol and acetone before use cleans.The temperature of liquid is all more than 15 ℃, below 40 ℃.(2) preparation of substrate
The present invention adopts mica hydrophilic, atomically flating as substrate.Mica is cut into about 12mm * 12mm; With double faced adhesive tape it is bonded on the iron plate of AFM special use, with tweezers its surperficial one deck is thrown off gently again.Blow the ear ball blow away the surface chip after, be put into the AFM head.The liquid bath that installs needle point, O-circle and rising pipe is put on the mica substrate of AFM head, fixes.(3) form nano bubble
Water inlet pipe by connecing liquid bath injects liquid bath gently with the absolute ethyl alcohol (top grade is pure) of syringe about with 2ml, clips the inlet tube and outlet tube of liquid bath, convergence needle point, imaging.Determine that mica surface does not have tangible bulky grain in ethanol, can't distinguish after preventing may be the particle of pollution and the nano bubble of formation.
After imaging is finished, lift needle point.Take off water inlet pipe, suck ultrapure water (Milli Q).When on liquid bath, injecting water pipe, open rising pipe gently.Ultrapure water about 5ml is injected liquid bath gently, discharge ethanol wherein.(4) observation of nano bubble
Drive nearly needle point, rap driving frequency (drive amplitude) 7-12KHz of pattern, driving amplitude (drive amplitude) 250-280mV, sweep speed (scan rate) 2Hz, scan area (scansize) 2um * 2um to 5um * 5um.When selecting the set point (setpoint) of AFM imaging, do the force curve of mica surface earlier.The value of set point should be lower than the position that force curve begins to descend slightly.
The substrate that the present invention adopts comprises and the contact angle of the water surfaces less than 90 degree, silicon, glass arranged and through the surface of chemistry or physical modification.
The alcohols that the present invention selects for use is except that ethanol, and these also can be replaced methyl alcohol, n-propanol, isopropyl alcohol and the tert-butyl alcohol by water by identical method with the alcohols that water dissolves each other, and forms nano bubble at mica surface.
Of the present invention is the alcohol and water of handling without the degassing.
The present invention has been owing to utilized the replacement process of alcohol and water, can form nano bubble at hydrophilic, even curface.This method has fine reappearance, and is easy and simple to handle, can not introduce pollution, be to nano bubble deeply, the basis of systematic study.
Embodiment:
Below by concrete example method of the present invention is further described.Embodiment 1: temperature is to forming the influence of nano bubble
Atomic force microscope is that (Digital Instruments Inc.), is equipped with O-circle and liquid bath in NanoScope IIIa SPM system." E " scanner head; Elasticity coefficient is the common NP needle point about 0.58N/m.Needle point cleans with ethanol and acetone before use.Water is the Millipore ultrapure water, and ethanol is that top grade is pure, purchases in Chinese chemical reagent main office.
Dark-coloured mica is sheared by the iron plate size; With double faced adhesive tape it is bonded on the iron plate.Throw off mica surface one deck with tweezers, blow the chip that the ear ball is blown away the surface, be put into the AFM head.Adjust head position, make needle point apart from the about 40um of mica surface, the liquid bath that installs needle point, O-circle and rising pipe is put on the mica substrate of AFM head, fixes.
Water inlet pipe by liquid bath will be incubated in 20 ℃ 2ml ethanol with syringe and inject liquid bath gently, clip the inlet tube and outlet tube of liquid bath, convergence needle point, imaging.Do not observe tangible larger particles.Lift needle point 5-10 micron, take off water inlet pipe, suction is incubated in 20 ℃ ultrapure water.When on liquid bath, injecting water pipe, open rising pipe gently.Ultrapure water about 5ml is injected liquid bath gently, discharge ethanol wherein.Drive nearly needle point, rap driving frequency (drive amplitude) 7.2KHz of pattern, driving amplitude (driveamplitude) 280mV, sweep speed (scan rate) 2Hz, scan area (scan size) 2um * 2um determines setpoint according to force curve.Can observe mica surface has some nano bubbles, the statistics bubble quantity and bubble.
As a comparison, by above-mentioned same quadrat method, inject earlier and be incubated in 35 ℃ ethanol, reinjecting is incubated water in 35 ℃.The AFM imaging can be observed more nano bubble, statistical magnitude.The result can determine that the quantity of 35 ℃ second alcohol and water replacement formation nano bubble is far longer than the quantity of 20 ℃ second alcohol and water replacement formation nano bubble, therefore in the temperature range that the present invention limited, the liquid of higher temperature can more help the formation of nano bubble.Embodiment 2: gas source determines in the nano bubble
Atomic force microscope is that (Digital Instruments Inc.), is equipped with O-circle and liquid bath in NanoScope IIIa SPM system." E " scanner head; Elasticity coefficient is the common NP needle point about 0.58N/m.Needle point cleans with ethanol and acetone before use.The power of used vacuum oil pump is 500W.Water is the Millipore ultrapure water, and ethanol is that top grade is pure, purchases in Chinese chemical reagent main office.The temperature of liquid is more than 15 ℃, below 40 ℃.
Dark-coloured mica is sheared by the iron plate size; With double faced adhesive tape it is bonded on the iron plate.Throw off mica surface one deck with tweezers, blow the chip that the ear ball is blown away the surface, be put into the AFM head.Adjust head position, make needle point apart from the about 40um of mica surface, the liquid bath that installs needle point, O-circle and rising pipe is put on the mica substrate of AFM head, fixes.
Ethanol and water are contained in respectively in the two-neck bottle, and bottle one end seals with plug, and the other end connects the vacuum oil pump by piston, and the final vacuum Du Keda-0.07MPa that bleeds keeps liquid 30 minutes under this vacuum tightness.After the degassing, the ethanol with the about 5ml degassing of syringe sucking-off is injected into liquid bath rapidly, clips inlet tube and outlet tube.The rapid more about 5ml de aerated water of sucking-off injecting water pipe on liquid bath when, is opened rising pipe gently, and water is injected liquid bath, discharges ethanol.Clip inlet tube and outlet tube immediately.Drive nearly needle point, imaging.Quantity to nano bubble on the unit area among the result is added up.Same experiment repeats to make the distributed number figure of nano bubble after 5-8 time.Same quadrat method, the distributed number figure of nano bubble is made in the experiment of the second alcohol and water that repeats not outgas.The second alcohol and water replacement that can see the degassing significantly forms nano bubble quantity well below the second alcohol and water that does not outgas.Can determine that like this gas source in the nano bubble is exactly a dissolved gases in the second alcohol and water.
The result's that will experimentize respectively in two researchs contrast and statistics, this is to be difficult to realize directly immersing on the surface that chemical drains is modified in the water.Alcohol and water is replaced and can be formed nano bubble at hydrophilic, smooth mica surface, and it is repeatable preferably to make experimental result have.Contrast, statistical experiment result, such two researchs have all obtained clear and definite result.
Claims (3)
1, a kind of based on the method for pure water replacement at hydrophilic even curface formation nano bubble, it is characterized in that comprising:
1) temperature of liquid is more than 15 ℃, below 40 ℃;
2) mica hydrophilic, atomically flating is adopted in substrate, mica is cut into about 12mm * 12mm, be bonded on the iron plate that atomic force microscope AFM imaging uses, again its surperficial one deck is thrown off gently, after blowing away surface debris, be put into the AFM head, the liquid bath that installs needle point, O-circle and rising pipe is put in the substrate fixes;
3) with syringe absolute ethyl alcohol is injected liquid bath gently by the water inlet pipe that connects liquid bath, clip the inlet tube and outlet tube of liquid bath, the convergence needle point after imaging is finished, lifts needle point, take off water inlet pipe, suck ultrapure water, when on liquid bath, injecting water pipe, open rising pipe gently, ultrapure water is injected liquid bath gently, discharge ethanol wherein;
4) drive nearly needle point, rap the driving frequency 7-12KHz of pattern, driving amplitude 250-280mV, sweep speed 2Hz, scan area 2um * 2um to 5um * 5um observes.
2, replace the method that forms nano bubble at hydrophilic even curface as claim 1 is said based on pure water, it is characterized in that the ethanol that adopts can use methyl alcohol, n-propanol, isopropyl alcohol or tert-butyl alcohol replacement.
3, replace the method that forms nano bubble at hydrophilic even curface as claim 1 is said based on pure water, it is characterized in that the surface of the contact angle of substrate employing and water, comprise the surface of silicon, glass and process chemistry or physical modification less than 90 degree.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007071151A1 (en) * | 2005-12-21 | 2007-06-28 | Shanghai Institute Of Applied Physics, Chinese Academy Of Sciences | A method for storing gas |
| CN1987414B (en) * | 2005-12-21 | 2011-04-20 | 中国科学院上海应用物理研究所 | Method for growing nano grade air bubbles and its observation and control device and method |
| CN104854204A (en) * | 2012-11-30 | 2015-08-19 | 中国涂料株式会社 | Coating composition for use in ship with reduced friction drag utilizing gas-lubricating function in water, coating film formed from said composition, ship coated with said coating film, method for manufacturing said ship, method for predicting said friction drag reduction effect, device used for prediction of said friction drag reduction effect, and friction drag reduction system for use in said ship with reduced friction drag |
| US10219670B2 (en) | 2014-09-05 | 2019-03-05 | Tennant Company | Systems and methods for supplying treatment liquids having nanobubbles |
| CN113769599A (en) * | 2021-08-30 | 2021-12-10 | 扬州大学 | Method for quickly and simply preparing nano bubbles |
| CN114797685A (en) * | 2022-05-10 | 2022-07-29 | 清华大学 | Method for generating bubbles on surface of hydrophilic material |
-
2003
- 2003-02-13 CN CN 03115380 patent/CN1195214C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007071151A1 (en) * | 2005-12-21 | 2007-06-28 | Shanghai Institute Of Applied Physics, Chinese Academy Of Sciences | A method for storing gas |
| CN1987414B (en) * | 2005-12-21 | 2011-04-20 | 中国科学院上海应用物理研究所 | Method for growing nano grade air bubbles and its observation and control device and method |
| CN104854204A (en) * | 2012-11-30 | 2015-08-19 | 中国涂料株式会社 | Coating composition for use in ship with reduced friction drag utilizing gas-lubricating function in water, coating film formed from said composition, ship coated with said coating film, method for manufacturing said ship, method for predicting said friction drag reduction effect, device used for prediction of said friction drag reduction effect, and friction drag reduction system for use in said ship with reduced friction drag |
| US10219670B2 (en) | 2014-09-05 | 2019-03-05 | Tennant Company | Systems and methods for supplying treatment liquids having nanobubbles |
| CN113769599A (en) * | 2021-08-30 | 2021-12-10 | 扬州大学 | Method for quickly and simply preparing nano bubbles |
| CN113769599B (en) * | 2021-08-30 | 2022-12-16 | 扬州大学 | Method for quickly and simply preparing nano bubbles |
| CN114797685A (en) * | 2022-05-10 | 2022-07-29 | 清华大学 | Method for generating bubbles on surface of hydrophilic material |
| CN114797685B (en) * | 2022-05-10 | 2023-03-14 | 清华大学 | Method for generating bubbles on surface of hydrophilic material |
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