A wedge-shaped non-uniform wettability surface capable of microdroplet self-transport and its preparation method

A self-transport and non-uniform technology, applied in the direction of coating, etc., to achieve the effect of promoting rapid desorption, improving water collection efficiency and microfluidic efficiency, and easy to roll off

Active Publication Date: 2018-07-06
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are no reports on the construction of wedge-shaped hydrophilic and hydrophobic regions on various substrates such as metals, ceramics, and polymers by spraying superhydrophobic coatings or hydrothermal oxidation.

Method used

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  • A wedge-shaped non-uniform wettability surface capable of microdroplet self-transport and its preparation method
  • A wedge-shaped non-uniform wettability surface capable of microdroplet self-transport and its preparation method
  • A wedge-shaped non-uniform wettability surface capable of microdroplet self-transport and its preparation method

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Experimental program
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preparation example Construction

[0056] The method for preparing a wedge-shaped non-uniform super-wetting surface capable of self-transporting microdroplets is characterized in that the super-hydrophobic coating contains 1-5mg / mL titanium dioxide or zinc oxide nanoparticles, 2-20mg / mL Silica nano chain particles, 1-10mg / mL hydrophobic silicone or fluororesin, 0.1-1mg / mL trimethoxy fluorine-containing silane with a carbon chain length of 5-10, are obtained by uniformly mixing in the presence of an organic solvent.

[0057] The method for preparing a wedge-shaped non-uniform super-wetting surface capable of self-transporting microdroplets is characterized in that the organic solvent includes any one of ethanol, acetone, butyl acetate, and toluene.

[0058] The method for preparing a self-transporting wedge-shaped non-uniform super-wetting surface of microdroplets is characterized in that, the hydrothermal oxidation method uses KOH and Zn(NO 3 ) 2 Formulated Zn(OH) 4 2- The aqueous solution reacts to build a ...

Embodiment 1

[0062] (1) Pretreatment: The slides were ultrasonically cleaned with acetone, absolute ethanol, and deionized water for 15 minutes in order to remove oil and dust on the surface, then rinsed with absolute ethanol, dried with cold air, and set aside.

[0063] (2) Superhydrophobic coating preparation: the coating contains 5mg / mL titanium dioxide or zinc oxide nanoparticles, 10mg / mL hydrophobic silicon dioxide nano chain particles, 4mg / mL hydrophobic silicone or fluororesin, 1mg / mL carbon chain Trimethoxy fluorine-containing silane with a length of 10 is mixed with ethanol, acetone, butyl acetate, toluene and other volatile miscible liquids as solvents, and mixed with ultrasonic or mechanical stirring for 5 hours. When in use, the super-hydrophobic paint is sprayed on the surface of the substrate, and after drying, blowing or drying, a super-hydrophobic surface is obtained.

[0064] (3) Construction of wedge-shaped non-uniform wetting surface: Expose the substrate through photore...

Embodiment 2

[0069] (1) Pre-treatment: ultrasonically clean a 1mm thick copper sheet (25mm*25mm, copper element content 99.5%) with acetone, absolute ethanol and deionized water for 15 minutes to remove oil and dust on the surface, and then clean it with absolute ethanol Rinse, dry with cold air, and set aside;

[0070] (2) Preparation of superhydrophobic surface: using hydrothermal oxidation method, the copper sheet is reversed or vertically inserted with KOH and Zn(NO 3 ) 2 The prepared concentration is 0.1M Zn(OH) 4 2- Aqueous solution, 90°C constant temperature water bath for 30min, grow zinc oxide nano-arrays on the surface of copper sheet, such as Figure 8 As shown, the superhydrophobic surface was obtained after fluorosilane modification;

[0071] (3) Construction of wedge-shaped superhydrophilic region: place a polydimethylsiloxane soft template with wedge-shaped through holes on the superhydrophobic surface of the substrate, irradiate with 500w ultraviolet light for 10 hours,...

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Abstract

The invention relates to a micro-droplet self-transported wedged non-uniform ultra-wetting surface and a preparation method thereof. A super-hydrophobic surface containing titanium dioxide or zinc oxide nano-materials is constructed on the surface of a substrate by using a coating spraying or hydrothermal oxidation method, and a template method is used, ultraviolet light catalysis or oxygen plasma region selective modification is carried out to obtain a wedged super-hydrophilic region, the template method also can be used to obtain a wedged covering region, and then the coating spraying or hydrothermal oxidation method can be used again, and region selection is carried out to construct the super-hydrophobic surface, so as to obtain the wedged non-uniform ultra-wetting surface, finally, the wedged region is further modified by using polyvinyl alcohol again to obtain a bulge of the smooth super-hydrophilic wedged region, so that micro-droplets can be transported spontaneously in the wedged region without external force driving. By selecting the region of a template, the wedged super-hydrophilic region arranged in an array can be obtained on the super-hydrophobic surface, and multiple micro-droplets are in self-propelled movement by one time, so that the micro-droplet self-transported wedged non-uniform ultra-wetting surface has broad application prospects in fields of condensation heat transfer enhancement or evaporation heat transfer, fog catchment, microfluid and the like.

Description

technical field [0001] The invention relates to a method for preparing a wedge-shaped non-uniform wettability surface that can be self-transported by microdroplets. Background technique [0002] In many important applications, such as heat transfer, seawater desalination, water harvesting, etc., the condensation of water vapor is a very important process. On a solid surface, the condensation process includes droplet condensation and film condensation, and the condensation method depends on the wettability of the condensation surface. Droplet condensation can greatly improve the efficiency of heat transfer. Studies have shown that compared with film condensation, the heat transfer efficiency of droplet condensation can be increased by more than 10 times. [0003] On the superhydrophobic surface of the micro-nano composite, the droplets exist in the superhydrophobic Cassie state on this surface. In this state, the water droplets are easy to desorb at a small inclination angle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D127/12C09D7/61C03C17/34C23C22/63
CPCC03C17/009C03C17/34C03C2217/40C03C2217/70C03C2218/112C08K3/22C08K3/36C08K5/5415C08K2003/2241C08K2003/2296C08K2201/011C09D7/61C09D127/12C09D183/04C23C22/63
Inventor 张友法安力佳余新泉陈锋
Owner SOUTHEAST UNIV
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