Superhydrophobic surface and method for forming same

A super-hydrophobic and stable technology that can be used in manufacturing tools, liquid chemical plating, transportation and packaging to solve problems such as unsuccessful field tests, low insulator adhesion, and insulator damage

Inactive Publication Date: 2009-06-03
GEORGIA TECH RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] (1) Cleaning with water, dry abrasive cleaners, or dry ice can effectively remove loose contaminants from insulation, but is expensive, labor-intensive, and only a short-term solution;
[0019] (2) Motorized protective coatings, including surface treatments with oils, greases, and pastes that prevent flashover but can damage insulators during dry-band arcing;
[0021] (4) The developed fluorinated polyurethane coating was used for high-voltage insulators, but field trials were not successful, and its low adhesion to insulators was a problem; and
However, plasma technology has been found to have disadvantages such as relatively high incidental costs and the need for special equipment in some applications
[0053] Another limitation of known superhydrophobic technologies is that their surfaces are monomorphic, due to the fact that the size distribution (height or diameter) varies within a relatively small margin of error.

Method used

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  • Superhydrophobic surface and method for forming same
  • Superhydrophobic surface and method for forming same
  • Superhydrophobic surface and method for forming same

Examples

Experimental program
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preparation example Construction

[0150] The preparation of nanoparticles is carried out under controlled conditions, such as substrate, salt, temperature and water. The preparation of core-shell structures can utilize the growth of seeded nanoparticles. The preparation of raspberry structures (multiple species) is achieved by adding different kinds of precursors and controlling the addition time of the second precursor, or by adding cohesive surface functional groups between two different nanoparticles. Additionally, different nanoparticles can be mixed together to form multiple types of nanoparticles. The preferred particle size range is from 30 nm to 20 μm.

[0151] In another preferred embodiment, the present invention includes surface treatment by applying a coupling agent to the surface at near ambient temperature to increase the contact angle and reduce hysteresis. This embodiment can utilize sol-gel methods and can be monomorphic or polymorphic and single or multispecies. This method involves the us...

Embodiment 1

[0240] First, TMOS (precursor), IBTMOS (co-precursor) and ethanol were mixed in the amounts given in "Material Example I" in Table 6. HCl (0.1M) was then added to adjust the pH of the mixture to about 1.8-2.0. The reaction was initiated by heating to 60°C and then held for five (5) hours. After the reaction is complete, 1.1M NH 3 h 2 O is a base added to the solution to initiate gelation of the polymer.

[0241] Before gelation is complete, the solution is cast on a suitable substrate (microscope slide, elastomer, etc.) to form a thin layer. Cover the surface to allow slow evaporation of ethanol and ammonia. After two (2) days, the film had completely gelled and the ethanol had evaporated completely. A thin silica layer is thus formed on the surface of the substrate. Execution of the above method on a microscope glass slide shows that the surface directly after coating is hydrophobic, which is due to the presence of hydrophobic side chains in the IBTMOS co-precursor ( ...

Embodiment II

[0250] TEOS (precursor), TFPS (co-precursor) and ethanol were first mixed in the amounts given in "Material Example II" in Table 6. HCl (1M) was then added to adjust the pH to about 1.8-2.0. The reaction was initiated by heating to 60°C and then held for five (5) hours. After the reaction, 0.1 g of ammonium hydroxide (29% by weight) (1.1 M) was added to 2 g of the solution to perform gelation of the polymer.

[0251]Before gelation is complete, the solution is cast on a suitable substrate to form a thin layer. Cover the surface to allow slow evaporation of ethanol and ammonia. After two (2) days, the film had gelled and the ethanol had evaporated completely. A suitable example for forming a thin silica layer on a substrate is a glass microscope slide.

[0252] The reason why the surface is hydrophobic is due to the presence of hydrophobic side chains in the TFPS co-precursor ( Figure 20-21 ). Figure 21 Including different reagent ratios (respectively Figure 21 A 1:3,...

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Abstract

The present invention is a method of applying Lotus Effect materials as a (superhydrophobicity) protective coating for various system applications, as well as the method of fabricating / preparing Lotus Effect coatings.

Description

technical field [0001] The present invention generally relates to the field of superhydrophobic surface coatings and methods for their manufacture. Background technique [0002] The lotus effect is named after the lotus plant and was first used in technical applications by Professor Wilhelm Barthlott of the University of Bonn. The lotus effect is usually expressed in two characteristic properties: superhydrophobicity and self-cleaning, however in some cases, either of these two properties can provide the advantages of the lotus effect. [0003] Superhydrophobicity indicates that the water contact angle is greater than 150°, while self-cleaning indicates that loose (non-adhesive) dirt particles such as dust or soot can be collected by water droplets rolling down the surface and thus removed. The superhydrophobicity and self-cleaning properties of the lotus effect surface are described in Figure 1. [0004] Common definitions of liquid / surface phenomena associated with ioniz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B33/00
CPCC23C24/00C23C18/00Y10T428/25Y10T428/31504
Inventor 休永豪朱令博丹尼斯·W·赫斯王启平肖飞罗伯特·N·汉普顿弗兰克林·库克·兰伯特
Owner GEORGIA TECH RES CORP
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