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Hydrophobic anisotropic surface and preparation method and application thereof

An anisotropic and hydrophobic technology, applied in the coating and other directions, can solve the problems of complex processing technology, increased surface adhesion of droplets, unfavorable non-destructive transportation of droplets, etc., achieving simple preparation method, easy size control, good quality The effect of flexibility

Active Publication Date: 2020-07-31
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the liquid pressure will destroy the air cushion and fill the micro-nano structure, resulting in increased adhesion of the droplet on the surface, which is ultimately not conducive to the non-destructive transport of the droplet.
[0003] The existing anisotropic surface processing technology, due to its complex processing technology and high cost, limits its development and application in liquid transportation
Therefore, how to develop a low-cost hydrophobic anisotropic surface with a stable air cushion for directional collection and continuous lossless delivery of droplets remains a great challenge.

Method used

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  • Hydrophobic anisotropic surface and preparation method and application thereof
  • Hydrophobic anisotropic surface and preparation method and application thereof
  • Hydrophobic anisotropic surface and preparation method and application thereof

Examples

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preparation example Construction

[0042]A method for preparing a hydrophobic anisotropic surface with a cone structure array, the method specifically includes the following steps:

[0043] (1) Mix the polymer material, surfactant and solvent in a ratio of 3:(0~2):(1~10), wherein the surfactant is preferably PVP (polyvinylpyrrolidone), CTAB (hexadecyl tri methyl ammonium bromide) or SDS (sodium dodecyl sulfate), the solvent is DMAC (dimethylacetamide), and stirred at 60°C to 100°C for 1 to 12 hours to obtain a uniform polymer solution.

[0044] (2) Use a scraper to scrape the film with different thicknesses (100 μm to 500 μm) on a clean glass plate, and immediately immerse the glass slices with polymer films of different thicknesses in different phase inversion solvents. The phase inversion solvents are preferably methanol, ethanol, Propanol, water, sodium chloride solution, and mixed solvents made by mixing them in different proportions, etc. For example, mix toluene and water into solutions with different ra...

Embodiment 1

[0048] A method for preparing a hydrophobic anisotropic surface with a cone structure array, specifically comprising the following steps:

[0049] (1) Preparation of casting solution: Stir and mix polysulfone polymer particles, PVP and DMF at a ratio of 3:1:10 to obtain polysulfone casting solution;

[0050] (2) Scraping film: use a scraper to scrape and coat the polysulfone casting solution prepared in step (1) on a glass plate, and control the thickness of the scraping film by adjusting the height of the scraper to obtain a series of polysulfone films with different thicknesses;

[0051] (3) Preparation of hydrophobic anisotropic cone structure array surface: immerse the glass plate loaded with polysulfone in a phase inversion solvent for a predetermined time, phase inversion and separation into a film, and then peel off the film layer by layer to obtain the cone structure array surface; then The surface of the cone structure array was soaked in the hydrophobic silica nanopa...

Embodiment 2

[0054] A method for preparing a hydrophobic anisotropic surface with a cone structure array, specifically comprising the following steps:

[0055] (1) Preparation of casting solution: Stir and mix polyethersulfone polymer particles, PVP and DMF at a ratio of 3:1:10 to obtain polyethersulfone casting solution;

[0056] (2) Scraping film: use a scraper to scrape the polysulfone casting solution prepared in step (1) on a glass plate, and control the thickness of the scraping film by adjusting the height of the scraper to obtain a series of polyethersulfone films with different thicknesses ;

[0057] (3) Preparation of hydrophobic anisotropic cone structure array surface: immerse the glass plate loaded with polyethersulfone in a phase inversion solvent for a predetermined time, phase inversion and separation into a film, and then peel off the film layer by layer to obtain the cone structure array surface; Subsequently, the surface of the cone structure array was soaked in a hydro...

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Abstract

The invention discloses a hydrophobic anisotropic surface as well as a preparation method and application thereof, and belongs to the technical field of micro-nano technology and polymer surface processing; the hydrophobic anisotropic surface is a cone structure array surface, and the hydrophobic anisotropic surface is finally prepared by preparing a membrane casting solution, scraping a membraneand performing phase inversion, stripping and hydrophobic modification. The cone structure array surfaces with different sizes are prepared by changing the thickness of a wiped film, the composition of a phase inversion solvent and the proportion of a mixed phase inversion solvent, and the surface hydrophobicity is controlled by hydrophobic nanoparticles with different concentrations. The preparation method disclosed by the invention is simple and feasible, and the prepared cone structure array is easy to control in size, low in cost, environment-friendly, safe, reliable and easy for industrial large-scale production. The technical scheme disclosed by the invention opens up a new way for large-scale preparation of the micro-nano structure, and provides a new thought for realizing directional lossless continuous conveying of the liquid.

Description

technical field [0001] The invention belongs to the technical field of micro-nano technology and polymer surface processing, and in particular relates to a hydrophobic anisotropic surface and its preparation method and application, in particular to the preparation of a hydrophobic cone-structured array surface with an elastic microstructure bottom pad and The surface has applications in the fields of droplet control and lossless droplet transport. Background technique [0002] Directed transport of liquids on anisotropic surfaces is an important research direction in materials science, and has received extensive attention in the fields of microreactors, lubrication, inkjet printing, self-cleaning surfaces, and microfluidics. Researchers have successfully fabricated anisotropic surfaces to realize directional transport of liquid droplets on the surface. At the same time, increasing surface hydrophobicity can further reduce the friction of droplets on the surface. Generally,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08J5/18C08L81/06C08L33/12C08L25/06
CPCC08J5/18C08J7/06C08J2325/06C08J2333/12C08J2381/06
Inventor 田东亮张秋雅张孝芳江雷
Owner BEIHANG UNIV
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