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Method for manufacturing ultra-thin polydimethylsiloxane film and composite film thereof on basis of liquid interface suspension technology

A technology of dimethylsiloxane and suspension technology, which is applied in the field of producing ultra-thin polydimethylsiloxane film and its composite film based on liquid surface suspension technology, which can solve the problem of poor mechanical strength, difficulty in manufacturing, and increase the number of PDMS films Issues such as complexity and cost to achieve low-cost effects

Inactive Publication Date: 2019-10-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently based on spin coating, drawing and other methods to fabricate PDMS films, especially ultra-thin PDMS films, there are problems such as difficult fabrication, poor controllability, and low yield.
Moreover, the PDMS film produced by the spin coating method or the drawing method is attached to the flat substrate, and it is often difficult to transfer it directly to the target substrate or device surface due to its poor mechanical strength.
Although the release and transfer of the fabricated PDMS film can be realized by prefabricating the sacrificial layer on the substrate, these processes increase the complexity and cost of the PDMS film fabrication process. In short, the existing PDMS film fabrication methods have great limitations. , which greatly limits the practical application of PDMS films

Method used

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  • Method for manufacturing ultra-thin polydimethylsiloxane film and composite film thereof on basis of liquid interface suspension technology
  • Method for manufacturing ultra-thin polydimethylsiloxane film and composite film thereof on basis of liquid interface suspension technology
  • Method for manufacturing ultra-thin polydimethylsiloxane film and composite film thereof on basis of liquid interface suspension technology

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Fabricate a suspended polydimethylsiloxane (PDMS) film with a diameter of 5mm and a thickness of about 500nm with superelasticity and gas permeability, and use it for long-term cell culture research. The specific steps are as follows, and the schematic diagram of the operation flow is as follows: figure 1 Shown:

[0032] (1) Fabrication of a square substrate with a through-hole structure: Take a PDMS sheet with a thickness of 5mm and a square of 1cm×1cm, and use a puncher with a diameter of 5mm to punch a through hole in the middle of the PDMS sheet to obtain a substrate with a through-hole structure. Square PDMS blocks;

[0033] (2) Production of PDMS film: mix the polydimethylsiloxane prepolymer and the curing agent, and then perform vacuum defoaming, then add n-hexane, and mix again to obtain an oil phase. Among them, polydimethylsiloxane The mass ratio of alkane prepolymer and curing agent is 10:1, and the volume ratio of polydimethylsiloxane prepolymer and normal ...

Embodiment 2

[0038] Make a PDMS composite film with a thickness of about 1 μm and a square of 7.5cm×2.5cm that has selective light shielding properties and is used to selectively shield near-infrared light. The specific steps are as follows, and the schematic diagram of the operation flow is as follows image 3 Shown:

[0039] (1) Production of PDMS composite film: mix the polydimethylsiloxane prepolymer and curing agent, and then perform vacuum defoaming, then add n-hexane and copper sulfide nanosheets, and mix again to obtain a composite oil phase, in which , the mass ratio of polydimethylsiloxane prepolymer and curing agent is 5:1, and the volume ratio of polydimethylsiloxane prepolymer, copper sulfide nanosheets and n-hexane is 1:1:60; Put a clean and flat glass slide into the bottom of a 500mL beaker containing deionized water, then take 30 μL of the above-mentioned composite oil phase and drop it on the water surface. After the composite oil phase spreads to the entire water surface, a...

Embodiment 3

[0043] Fabricate a suspended PDMS composite film with a diameter of 5 mm and a thickness of about 5 μm, which is superelastic, magnetic and conductive, and use it to make a flexible magnetic sensor. The specific steps are as follows:

[0044] (1) Fabrication of a square substrate with a through-hole structure: Take a PDMS sheet with a thickness of 5mm and a square of 1cm×1cm, and use a puncher with a diameter of 5mm to punch a through hole in the middle of the PDMS sheet to obtain a substrate with a through-hole structure. Square PDMS blocks;

[0045] (2) Production of PDMS composite film: Mix polydimethylsiloxane prepolymer and curing agent, then vacuum defoam, then add silicone oil, magnetic nanoparticles and silver nanowires, and mix again to obtain a composite oil phase , wherein, the mass ratio of polydimethylsiloxane prepolymer and curing agent is 20:1, and the volume ratio of polydimethylsiloxane prepolymer, magnetic nanoparticles, silver nanowires and silicone oil is 1...

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Abstract

The invention relates to a method for manufacturing an ultra-thin polydimethylsiloxane film and a composite film thereof on the basis of a liquid interface suspension technology, belonging to the technical field of micro-nano manufacturing. The method can manufacture a polydimethylsiloxane film with a thickness of 100 nm to 25 [mu]m and the composite film thereof by utilizing a principle of mutualinsolubility of an oil phase / a water phase and the gradient action of the surface tension forces of two liquid phase interfaces; and the method does not need a harsh processing environment and expensive equipment, avoids limitations like complicated process, long cycle, poor flexibility, difficult film transfer operation and insusceptibility to realizing large-area film manufacturing for traditional thin polydimethylsiloxane film manufacturing, can realize rapid, flexible, highly-efficient, low-cost and large-area manufacturing of the thin polydimethylsiloxane film and the composite film thereof, and is expected to promote popularization and application of the thin polydimethylsiloxane film in the fields of materialogy, biology, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of micro-nano manufacturing, and in particular relates to a method for manufacturing ultra-thin polydimethylsiloxane films and composite films based on liquid surface suspension technology. Background technique [0002] Polydimethylsiloxane (PDMS) film has unique physical and chemical properties, such as ultra-high elasticity, high ductility, good surface adaptability, excellent gas permeability, good inertness, etc., so it is used in wearable It has outstanding application advantages in sensors, cell and tissue biomechanical research, gas sensor packaging, drug sustained release, etc. However, currently based on spin-coating, drawing and other methods to fabricate PDMS films, especially ultra-thin PDMS films, there are problems such as difficult fabrication, poor controllability, and low yield. Moreover, the PDMS film produced by the spin-coating method or the pulling method is attached to a flat substrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L83/04C08K7/06B23K26/38
CPCB23K26/38C08J5/18C08J2383/04C08K7/06C08K2201/011
Inventor 李刚景伟杰廖鼎鹏
Owner CHONGQING UNIV
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