A surface with pneumatic control of wettability, its preparation method and its application in droplet collection

A wettable, aerodynamic technology that is used in processes for producing decorative surface effects, microstructure devices composed of deformable elements, electrical components, etc. It can achieve the effect of large controllability and intelligence, large adjustment range of surface structure, and significant adjustment of surface wettability.

Active Publication Date: 2019-03-01
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the rough structure and gas path design of this method at present, the impact on wettability is very limited, and the ideal control effect cannot be achieved.

Method used

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  • A surface with pneumatic control of wettability, its preparation method and its application in droplet collection
  • A surface with pneumatic control of wettability, its preparation method and its application in droplet collection
  • A surface with pneumatic control of wettability, its preparation method and its application in droplet collection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Aerodynamically responsive structures with raised air pockets were fabricated using a "stretch-bonding" process.

[0047] A method for preparing an aerodynamic response structure with raised airbags by using "stretch bonding", the specific steps are as follows:

[0048] (1) Preparation of gas path structure layer: including hard template photolithography and soft etching of gas path structure;

[0049] The specific steps are as follows: firstly, spin-coat SU8 photoresist flat film on the glass substrate, the rotation speed is 2000r / min, the time is 60s, and the film thickness is 100μm; then, carry out ultraviolet exposure for 7min, develop for 10min, and form a Then, inject the PDMS prepolymer mixture into the hard template to form a liquid layer with a thickness of 5mm on the surface of the hard template, and heat it at 65°C for 0.5h to cure it; finally, the PDMS cured layer Separate from the hard template to obtain the positive structure corresponding to the hard tem...

Embodiment 2

[0055] Enhancing aerodynamic regulation of surface wettability by surface selective modification.

[0056] Studies have shown that the superhydrophobicity of the material surface can be greatly improved by modifying the surface nanostructure. At the same time, the aerodynamic response structure of the present invention can be convex or concave with the inflation and deflation of the raised micro-airbag, so that the actual contact surface between the surface and the droplet is between the top of the micro-airbag and the bonding area between the micro-airbag Switch back and forth. Accordingly, the surface of the aerodynamic responsive structure can be selectively modified, that is, the nanoparticle deposition is only performed on the surface of the bonding area (that is, the groove area between the micro-airbags in the natural state), while the top surface of the micro-airbag remains intact. In this way, a micro-nano multi-level structure composed of aerodynamic micro-structure...

Embodiment 3

[0063] Pneumatically modulated wettability surfaces are applied to droplet collection.

[0064] The present invention obtains a surface that can directly switch the wetting state by inflation and deflation by combining "stretching bonding" and surface selective modification. When the gas is inflated, the surface wetting state is a transition state, and the droplet is fixed on the surface of the aerodynamic response structure due to the large atomic force on the contact surface; while the surface state changes to the Cassie-Baxter state when the gas is deflated, and the atomic force on the droplet is greatly reduced. , causing it to be released from the surface and roll quickly across the surface. In this way, the intelligent collection of liquid droplets on the surface of the present invention can be realized by using air inflation and deflation.

[0065] Pneumatic control of wettable surface is applied to droplet collection, the specific steps are:

[0066] (1) The aerodyna...

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Abstract

The invention discloses a surface capable of pneumatically controlling wettability, a preparation method thereof, and an application thereof in drop collection, and belongs to the technical field of intelligent surfaces. The surface comprises a bottom-layer substrate layer, a gas path structural layer, a cover layer and an external gas path from the bottom up, wherein the gas path structural layer is composed of a plurality of air paths formed by a series of concave grooves, and raised platforms between the adjacent gas paths; the cover layer is bonded with the raised platforms of the gas path structural layer and a part of exposed bottom-layer substrate layer around the gas path structural layer, and a fitting area is formed by the bound areas; tiny air bags are formed in the cover layer area on branches, and the tiny air bags of the cover layer can be controlled to be fully raised or sunk via inflating or deflating; a pneumatically responding structure formed by the series of periodically distributed raised tiny air bags is embedded into the surface, and meanwhile nano structures are used for modifying the surface to acquire a micro-nano multilevel structure, raising or sinking of the air bags are controlled by inflating or deflating; and thus intelligent control on wettability of the surface is achieved by pneumatically changing the surface structure.

Description

technical field [0001] The invention belongs to the field of smart surface technology, and specifically relates to a micro-nano multi-level structure surface with aerodynamic response processed by soft lithography, and the comprehensive control of the wettability of the surface is realized by filling and deflation, so as to realize the intelligent collection of water droplets . Background technique [0002] Smart surfaces refer to bionic surfaces with intelligent response characteristics of various biological surfaces in nature obtained through micro-nano processing technology. Similar biological intelligence response characteristics are often highly functional, such as the color change of echinoderms in response to light, the camouflage of chameleons in response to the environment, and the behavior of viruses in response to heat. Among them, the most typical type of smart surface is the smart surface with adjustable wettability, which has important applications in microflu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B81B3/00B81B7/04B81C1/00
CPCB81B3/0035B81B3/0089B81B7/04B81C1/00182B81C1/00206B81C1/00214B81C2201/0174
Inventor 孙洪波张永来王剑楠
Owner JILIN UNIV
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