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Preparation method of superhydrophilic polydimethylsiloxane film on basis of nano forest template

A technology of polydimethylsiloxane and dimethylsiloxane, which is applied in the field of superhydrophilic polydimethylsiloxane film preparation, can solve the problem of difficult to achieve superhydrophilic PDMS film with extremely small contact angle , The super-hydrophilic properties of PDMS films are difficult to maintain for a long time, and the uniformity of super-hydrophilicity is difficult to guarantee, so as to achieve the effects of stable super-hydrophilic properties, low cost and small contact angle

Inactive Publication Date: 2012-07-18
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, it is difficult to achieve superhydrophilic PDMS films with extremely small contact angles by ultraviolet irradiation.
Although oxygen plasma treatment and surface chemical treatment can achieve a very small contact angle of less than 5°, it is difficult to maintain the superhydrophilic properties of the prepared PDMS film for a long time.
At present, there are multi-step methods that combine oxygen plasma treatment and surface chemical treatment to achieve long-term stable superhydrophilic PDMS films, but the multi-step process leads to increased costs, and it is difficult to ensure the uniformity of superhydrophilicity, which limits its promotion and application. application

Method used

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  • Preparation method of superhydrophilic polydimethylsiloxane film on basis of nano forest template
  • Preparation method of superhydrophilic polydimethylsiloxane film on basis of nano forest template
  • Preparation method of superhydrophilic polydimethylsiloxane film on basis of nano forest template

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Experimental program
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Effect test

Embodiment 1

[0032] Step 1: Mix the PDMS polymer body and the polymer initiator according to the mass ratio of 5:1 to 20:1 to form a PDMS prepolymer, then place it in a sealed cavity, and use a vacuum pump to pump the gas for 10 to 45 minutes. Until no air bubbles remain in the PDMS prepolymer;

[0033] Step 2: Place the template with a dense nano-forest structure surface on the bottom of the PDMS prepolymer, then place it in a sealed cavity, and use a vacuum pump to pump the gas for 10 to 45 minutes until no bubbles remain in the PDMS prepolymer;

[0034] Step 3: Place the PDMS prepolymer in step 2 in an oven for heating and curing at a temperature of 70-100°C for 1-2 hours;

[0035] Step 4: peel off the PDMS film from the surface of the template with a dense nano-forest structure to obtain a PDMS film with a dense nano-array structure surface;

[0036] Step 5: Control the process parameters of deep reactive ion etching equipment, and sequentially feed SF 6 , O 2 and CHF 3 Gas surface...

Embodiment 2

[0043] Step 1: Mix the PDMS polymer body and the polymer initiator according to the mass ratio of 5:1 to 20:1 to form a PDMS prepolymer, then place it in a sealed cavity, and use a vacuum pump to pump the gas for 10 to 45 minutes. Until no air bubbles remain in the PDMS prepolymer;

[0044] Step 2: heat the PDMS prepolymer in an oven to form a soft PDMS semi-solid at a temperature of 50-70°C for 15-30 minutes;

[0045] Step 3: Place the template with a dense nano-forest structure surface on top of the PDMS semi-solid, and then press the template evenly to make the template and the PDMS semi-solid tightly combined;

[0046] Step 4: Place the PDMS semi-solid in step 3 in an oven for heating and curing at a temperature of 70-100°C for 1-2 hours;

[0047] Step 5: peeling off the PDMS film from the surface of the template with a dense nano-forest structure to obtain a PDMS film with a dense nano-array structure surface;

[0048] Step 6: Control the process parameters of deep reac...

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Abstract

The invention discloses a preparation method of a superhydrophilic polydimethylsiloxane film on the basis of a nano forest template, which comprises the following steps of 1 evenly mixing a polydimethylsiloxane polymer body with a polymer initiator to form a polydimethylsiloxane prepolymer according to a certain mass ratio; 2 by means of a stamping or casing method, controlling the temperature and the time, transferring nano forest structure graphics on the surface of the template to the surface of polydimethylsiloxane to form the polydimethylsiloxane film with the dense nano array structure surface; and 3 controlling process parameters of a deep reactive ion etching device, and utilizing different gas combinations to perform physical and chemical treatment on the polydimethylsiloxane film with the dense nano array structure surface. The preparation method has the advantages of utilizing the nano forest structure surface as the template and combining the plasma etching process to perform surface modification to prepare the stable superhydrophilic polydimethylsiloxane film with a contact angle smaller than 5 degrees.

Description

technical field [0001] The invention relates to the technical field of micro-nano processing, in particular to a method for preparing a super-hydrophilic polydimethylsiloxane film based on a nano-forest template. Background technique [0002] Polydimethylsiloxane (Polydimethylsiloxane, abbreviated as PDMS, the same below), is a high molecular organosilicon compound, also known as organosilicon. It has the characteristics of low cost, non-toxic, non-flammable, good biocompatibility, and excellent light transmission, so it is widely used in the field of micro-nano processing technology, especially in the fields of microfluidics and biomedical microsystems. [0003] Hydrophobicity is one of the inherent properties of PDMS. The smooth PDMS surface itself has hydrophobic properties, and the contact angle with tiny water droplets (4-10μL, deionized water) is about 105°-120°, while the contact angle between the material surface and water droplets is greater than 90° That is hydrop...

Claims

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Application Information

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IPC IPC(8): B81C3/00
Inventor 张海霞张晓升尼古拉斯・皮特朱福运褚世敢
Owner PEKING UNIV
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