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Preparation method and equipment of gradient wetted surface for achieving self-driving of liquid drops

A gradient wetting, self-driving technology, applied in the photoengraving process, optomechanical equipment, microlithography exposure equipment and other directions of the pattern surface, can solve the problem that the gradient wetting surface cannot be industrialized, etc. Simple equipment and easy operation

Active Publication Date: 2016-09-14
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the current preparation method of gradient wetting surface cannot be industrialized, the present invention proposes a simple method for preparing a gradient wetting surface capable of realizing droplet self-driving on any substrate and its preparation method. equipment

Method used

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  • Preparation method and equipment of gradient wetted surface for achieving self-driving of liquid drops
  • Preparation method and equipment of gradient wetted surface for achieving self-driving of liquid drops
  • Preparation method and equipment of gradient wetted surface for achieving self-driving of liquid drops

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Embodiment 1

[0029] Embodiment 1 The preparation method of the self-driven gradient wetting surface of droplets according to the present invention comprises the following steps:

[0030] 1) Preparation of superhydrophobic titanium dioxide coating solution: mix 0.1g of titanium dioxide powder with a particle size of 25nm and 10mL of absolute ethanol, and then ultrasonicate at 100Hz for 15min to form a 0.01g / mL titanium dioxide suspension, then add 0.2mL of ten Octyltrimethoxysilane, continue to mix under 100Hz ultrasonic for 10min, then react at room temperature for 12h to obtain a superhydrophobic titanium dioxide coating solution for coating, that is, a superhydrophobic titanium dioxide coating, wherein the octadecane The volume ratio of trimethoxysilane to titanium dioxide suspension is 0.02:1;

[0031] 2) Preparation of a substrate with a superhydrophobic surface: use a spin coater to spin-coat the superhydrophobic titanium dioxide coating solution onto the cleaned substrate surface fiv...

Embodiment 2

[0036] Embodiment 2 The device constructed according to the preparation method of claim 1, comprising a substrate 1 and a hydrophilic-hydrophobic layer 2 coated on the surface of the substrate, the hydrophilic-hydrophobic layer 2 is divided into seven regions, and the regions Arrange from the sample feeding end of the matrix to the detection end of the matrix along the axial direction of the matrix, and the same area is composed of several superhydrophilic patterns, while from the sample loading end of the matrix to the detection end of the matrix along the axial direction of the matrix, the hydrophilicity of the adjacent area The number of water patterns increases, that is, the distance between hydrophilic patterns in adjacent regions decreases, and the proportion of hydrophilic regions on the corresponding substrate increases gradually. Gradient wetting surface, the part corresponding to the hydrophilic pattern is the superhydrophilic region 5 , and the part outside the hydro...

Embodiment 3

[0039]Embodiment 3: The difference between this embodiment and Example 1 is: the substrate is a glass substrate, and the preparation method of the glass substrate with a super-hydrophobic layer is: each ultrasonic cleaning of the glass sheet in acetone, ethanol, and deionized water for 10min, Then set the rotation speed of the spin coater to 1000 rad / min, spin coat five times, and spin coat the suspension on the cleaned glass substrate by five drops each time, and finally treat it in an oven at 120 ° C for 1 h to obtain The substrate of the hydrophobic layer, such as figure 2 The upper left is the SEM image of the superhydrophobic surface, and the illustration in the upper right corner is a picture of the water contact angle of the surface, the contact angle is 152.5°, figure 2 The lower left is a cross-sectional view of the super-hydrophobic layer. It can be seen that the thickness of the coating is about 5 μm.

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Abstract

The invention provides a preparation method and equipment of a gradient wetted surface for achieving self-driving of liquid drops. The method comprises steps as follows: titanium dioxide particles are subjected to silanization treatment to obtain a super-hydrophobic coating; the coating coats a substrate in a spinning manner to obtain a super-hydrophobic surface; regioselective photolysis is carried out by deep ultraviolet light UV under the assist of a mask plate designed with a gradient light transmission area, and a gradient pattern designed on the mask plate can be copied on the surface of the super-hydrophobic coating; and an exposed area is transformed into super-hydrophilicity from super-hydrophobicity to obtain the gradient wetted surface. The equipment comprises the substrate and a hydrophilic-hydrophobic layer coating the surface of the substrate, wherein the hydrophilic-hydrophobic layer is divided into a plurality of areas. The preparation method and the equipment have the beneficial effects that customizing of the wetting gradient can be achieved by combining the gradient wetted surface prepared by hydrophilic-hydrophobic patterning; a microfluid can be self-driven on the surface in a directional manner; external auxiliary equipment is not needed; miniaturization and portability of a microfluidic system are easier to achieve; the preparation method is free of a strict requirement on a production environment and a substrate material; and the production cost is low.

Description

technical field [0001] The invention relates to a preparation method and equipment for realizing a droplet self-driven gradient wetting surface. Background technique [0002] Wettability gradient surface is a high-performance material whose composition, structure, and wettability change continuously or stepwise with space. The surface tension is not equal, which leads to the tendency and ability of the liquid to flow automatically from the place of low surface energy to the place of high surface energy. Therefore, the gradient wetting surface has been widely used in the fields of biocompatibility, diagnostics, nanotribology, microfluidics, liquid self-transportation, etc. There are important applications in thermal processes and heat dissipation performance of micro heat pipes. [0003] In 1978, Greenspan theoretically predicted for the first time the directional motion of water droplets on a gradient wetting surface. It was not until 1992 that Chaudhury and Whitesides us...

Claims

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Application Information

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IPC IPC(8): G03F7/20C09D1/00D06N7/00D06Q1/00
CPCG03F7/70033G03F7/70216D06N7/00D06Q1/00C09D1/00
Inventor 吴化平刘爱萍张征丁浩柴国钟朱凯曹彬彬吴兵兵
Owner ZHEJIANG UNIV OF TECH
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