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Preparation method for PDMS variable period annular microfold structure

A variable period and wrinkle technology, which is applied in the field of preparation of PDMS variable period annular micro-wrinkle structures, can solve the problems of difficult to control the regularity and ordering of surface wrinkles, and achieves short cycle, low production cost and simple process flow. Effect

Inactive Publication Date: 2018-04-24
UNIV OF SHANGHAI FOR SCI & TECH
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  • Claims
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Problems solved by technology

However, this method is mostly uniaxial stretching. During biaxial stretching and multiaxial stretching, it is difficult to control the regularity and order of surface wrinkles, and the period of the usually formed wrinkles is fixed.

Method used

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  • Preparation method for PDMS variable period annular microfold structure
  • Preparation method for PDMS variable period annular microfold structure
  • Preparation method for PDMS variable period annular microfold structure

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing and implementation.

[0023] A method for preparing a PDMS variable-period annular micro-fold structure, the steps are as follows:

[0024] (1) Preparation of PDMS soft film. Mix the PDMS prepolymer and curing agent at a ratio of 10:1, stir evenly, place in a vacuum drying oven, and keep vacuuming until the liquid has no bubbles. Then pour the vacuumed PDMS liquid on the surface of the glass substrate, heat and solidify at 100°C for 2 hours, and then cool it down. After cooling, the PDMS was peeled off from the glass substrate, and then cut into circular PDMS for later use.

[0025] (2) The fabricated circular PDMS membrane is stretched. Fix the circular PDMS membrane in a fixture with a circular hole 1 ( figure 1 ), and then push the circular PDMS membrane 3 from the hole to form a cone-shaped structure with a pre-specified angle cone top 2 .

[0026] (3) Treat the taper...

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Abstract

The invention relates to a preparation method for a PDMS variable period annular microfold structure, comprising the steps of preparing PDMS soft film; clipping the prepared film into a circle; fixingthe clipped circular film on a clamp with a circular hole, and pushing the film from the hole to form a conical structure through utilization of a pyramid with a pre-customized special angle; horizontally fixing a low pressure mercury lamp (comprising light of two wavelengths: 185nm and 254nm) on a step motor, and placing the low pressure mercury lamp above the conical structure; and uniformly irradiating the formed conical structure for certain time, forming a layer of SiOx film with different thicknesses on the PDMS soft film and then cancelling the pushing, thereby forming the variable period annular microfold structure on soft and hard film surfaces and finishing the preparation method, wherein the formed structure is concentric annular fold with a sparse center and a dense edge. Themethod has the advantages of simple operation, short preparation period and low cost. The structure can be used as a Fresnel lens and a Fresnel zone plate.

Description

technical field [0001] The invention relates to an optical and micro-processing technology, in particular to a method for preparing a PDMS variable-period annular micro-fold structure. Background technique [0002] Folding phenomena can be seen everywhere in nature, industry and daily life, such as folds in geological formations, folds in papermaking, and folds in human skin. The understanding of wrinkle formation has evolved considerably over the past decade, and the most commonly used model is the bilayer membrane, which consists of a thick substrate of soft elastomer (such as polydimethylsiloxane PDMS) and It consists of a hard film layer deposited on the surface. The most commonly used soft elastomer substrate is PDMS. The basic principle of forming wrinkles is to form a thin silicon oxide layer on the surface of PDMS, and then release the pre-stretching stress, because the silicon oxide layer has higher elasticity than PDMS. Modulus and bending strength, the PDMS subs...

Claims

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Application Information

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IPC IPC(8): B81C1/00
CPCB81C1/00206B81C1/00214B81C1/00349
Inventor 盛斌李红叶彭丽娜张翔王良玉黄元申倪争技
Owner UNIV OF SHANGHAI FOR SCI & TECH
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