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Method for forming nano gas layer on pyrolytic graphite surface based on alcohol-water substitution

A pyrolytic graphite, alcohol-water replacement technology, applied in the preparation of electrical components, test samples, discharge tubes, etc., can solve the problem of not being aware of the important influence of the parameter conditions on the gas enrichment process, unable to form a nano gas layer, unable to obtain The real form of the enriched gas, etc., to achieve the effect of simple operation and good reproducibility

Inactive Publication Date: 2005-02-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In this group, nano-bubbles were formed by replacing alcohol with water (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; 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), did not realize that some parameter conditions (such as liquid temperature and water purity, etc.) Therefore, it is impossible to form a nano-gas layer, and it is impossible to obtain the true form of gas enriched gas at the HOPG / water interface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the enrichment form of solid-liquid interface gas

[0023] The atomic force microscope was a NanoScope IIIa SPM system (Digital Instruments, Inc.) equipped with an O-ring and liquid bath. "E" scanning head; NP-S tip with an elastic coefficient of 0.58N / m. The needle tip was cleaned with ethanol and acetone before use. Water was Millipore ultrapure water, and ethanol was premium grade, purchased from China Chemical Reagent Corporation.

[0024] Stick a piece of HOPG of 12mm×12mm on the iron sheet with double-sided tape, peel off a layer of HOPG surface with transparent tape, and put it on the AFM head. Adjust the position of the head so that the needle tip is about 40um away from the surface of the HOPG, and place the liquid tank with the needle tip, O-ring and outlet pipe on the HOPG base of the AFM head and fix it.

[0025] Use a syringe to gently inject 2ml of ethanol into the liquid tank through the water inlet pipe of the liquid tank, clamp the wate...

Embodiment 2

[0027] Embodiment 2: the influence of temperature on forming nano gas layer (or bubble)

[0028]The atomic force microscope was a NanoScope IIIa SPM system (Digital Instruments, Inc.) equipped with an O-ring and liquid bath. "E" scanning head; NP-S tip with an elastic coefficient of 0.58N / m. The needle tip was cleaned with ethanol and acetone before use. Water was Millipore ultrapure water, and ethanol was premium grade, purchased from China Chemical Reagent Corporation. Stick a piece of HOPG of 12mm×12mm on the iron sheet with double-sided tape, peel off a layer of HOPG surface with transparent tape, and put it on the AFM head. Adjust the position of the head so that the needle tip is about 40um away from the surface of the HOPG, and place the liquid tank with the needle tip, O-ring and outlet pipe on the HOPG base of the AFM head and fix it.

[0029] Use a syringe to gently inject 2ml of ethanol kept at 25°C into the liquid tank through the water inlet pipe of the liquid ...

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PUM

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Abstract

A method for forming nanoairlayer includes applying hydrophobic, flat and high-order pyrolytic graphite as base, injecting water first and then alcohol, forming nanoairlayer or nanoairbubble on boundary of base and water by utilizing alternative course of water and alcohol, keeping liquid temperature as above 5 degree C and below 85 degree C.

Description

technical field [0001] The present invention relates to a kind of method based on the replacement of alcohol and water to form nano gas layer (or bubble) on the hydrophobic surface, specifically, it is a kind of method that utilizes water-miscible alcohol (including Methanol, ethanol, n-propanol, isopropanol and tert-butanol) and water replacement process can form a nano-air layer (or bubble) method on the interface between the substrate and water, which belongs to the nano-air layer at the solid-liquid interface in physical chemistry (or bubbles) forming technical fields. Background technique [0002] No matter in the field of basic research or applied science, the nano-gas layer (or bubble) at the solid-liquid interface is a problem that has attracted much attention. According to classical thermodynamics, the smaller the volume of the bubble, the greater the internal pressure, and high pressure will inevitably cause the bubble to burst. Theoretically, nanobubbles cannot ...

Claims

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Application Information

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IPC IPC(8): G01N1/28H01J37/20
Inventor 张雪花胡钧孙洁林张晓东
Owner SHANGHAI JIAO TONG UNIV