Method for preparing superhydrophobic surface through one-step electro-deposition way

A super-hydrophobic surface, electrodeposition technology, applied in the direction of electrolytic inorganic material coating, etc., to achieve the effects of environmental friendliness, good acid-base stability, and low cost

Inactive Publication Date: 2015-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a super-hydrophobic surface by one-step electrodeposition in view of the shortcomings that most of the existing artificial super-hydrophobic surfaces require more than two steps to be realized.

Method used

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  • Method for preparing superhydrophobic surface through one-step electro-deposition way

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preparation example Construction

[0012] The steps of the preparation method of the superhydrophobic surface are as follows:

[0013] 1) Add 0.1~5mL long-chain alkyl siloxane dropwise to 50~95mL ethanol or methanol, adjust the pH to 2.0~6.0 with hydrochloric acid, slowly add 50~5mL sodium nitrate or nitric acid with a concentration of 0.2mol / L under stirring Potassium, stirred and hydrolyzed for 1~72h to obtain sedimentation solution;

[0014] 2) Place the conductor substrate to be deposited in the deposition solution as the cathode, and use graphite or platinum sheet as the auxiliary electrode, at 0.1~10.0mA / cm 2 Electrodeposit for 1 to 30 minutes at a current density, take out the substrate and dry the residual solution on the surface with gas to obtain a superhydrophobic surface covered with a nanoporous functionalized silicon dioxide film.

[0015] The conductor matrix to be deposited is gold, silver, platinum, carbon steel, galvanized steel, aluminum, zinc, copper, magnesium, tin and alloys thereof, cond...

Embodiment 1

[0021] Add 0.1 mL of dodecyltrimethoxysilane dropwise to 50 mL of ethanol, adjust the pH to 2.0 with hydrochloric acid, slowly add 50 mL of 0.2 mol / L potassium nitrate, and hydrolyze for 1 hour at room temperature to obtain a deposition solution. The degreased stainless steel is placed in the deposition solution as the cathode, and the platinum sheet is used as the auxiliary electrode, at 10.0mA / cm 2 Electrodepositing under current for 1 min yielded a superhydrophobic nanoporous functionalized silicon dioxide film with a surface water contact angle of 152.6°.

Embodiment 2

[0023] Add 5 mL of dodecyltrimethoxysilane dropwise to 95 mL of methanol, adjust the pH to 6.0 with hydrochloric acid, slowly add 5 mL of 0.2 mol / L potassium nitrate, and hydrolyze at room temperature for 72 hours to obtain a deposition solution. The degreased stainless steel was placed in the deposition solution as the cathode, and the platinum sheet was used as the auxiliary electrode, at 0.1mA / cm 2 Electrodepositing under current for 30 minutes obtained a superhydrophobic nanoporous functionalized silicon dioxide film, and the surface water contact angle was 155.4°.

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Abstract

The invention discloses a method for preparing a superhydrophobic surface through a one-step electro-deposition way. The method is characterized in that a coarse silane film is prepared on the surface of a conductive solid in hydrolysate containing long alkyl chain siloxane by adopting a one-step electrochemical deposition technology, so that a superhydrophobic surface having a contact angle with the water to be more than 150DEG. The preparation method has universality and can be applied to multiple conductive solid surfaces such as metal (and alloy), conductive glass and conductive polymer and applicable to substrates with irregular shapes. The preparation method is simple in process, moderate in condition and low in cost. The prepared superhydrophobic surface has good acid and alkali resistance.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic surface technical background [0002] Surface wettability is an important property of material interfaces. Interface materials with special surface wettability, such as superhydrophobic surfaces with a contact angle of more than 150° with water, are of great significance in both academic research and industry. It is becoming one of the research hotspots in the field of material surface wettability. People's research on superhydrophobic phenomenon began in the 1950s. In 1997, German biologists Neinhuis and Barthlott ( Planta 1997, 202: 1-8) studied the superhydrophobic phenomenon of lotus leaves in nature, and for the first time studied the microscopic and fine structure of the lotus leaf surface in detail, revealing the rough microstructure of lotus leaves and the low surface energy substances covered on the surface is the main reason for its superhydrophobic and self-cleaning proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/08
Inventor 胡吉明伍廉奎
Owner ZHEJIANG UNIV
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