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Bacterial cellulose conductive thin film and preparation method thereof

A technology of bacterial cellulose and composite film, which is applied in the field of bacterial cellulose conductive composite film and its preparation, can solve the problems of low electrical conductivity and the like, achieve high electrical conductivity, facilitate industrial production, and simplify the preparation process.

Inactive Publication Date: 2012-10-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of bacterial cellulose conductive composite film with higher conductivity for the problem of low conductivity of existing carbon nanotube / bacterial cellulose composite film

Method used

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  • Bacterial cellulose conductive thin film and preparation method thereof
  • Bacterial cellulose conductive thin film and preparation method thereof

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preparation example Construction

[0031] The preparation method of bacterial cellulose conductive composite film of the present invention comprises the following steps:

[0032] ① Thermally shock expandable graphite at a high temperature of 900-1200°C for 15-25 seconds to obtain expanded graphite;

[0033] ② The prepared expanded graphite was stirred in absolute ethanol at high speed for 20-60 minutes, then ultrasonically treated for 10-14 hours, filtered, washed, and dried at 80-120°C to obtain nano-graphite microflakes;

[0034] ③Put nano-graphite flakes into the dispersion medium to form nano-graphite flakes solution;

[0035] ④ Ultrasonic treatment of the nanographite microflake solution for 2-3 hours to obtain a suspension of uniformly dispersed nanographite microflakes;

[0036] ⑤ Add bacterial cellulose wet film to the suspension of nano-graphite microflakes, and perform ultrasonic treatment for 3-9 hours;

[0037] ⑥Take out the treated bacterial cellulose wet film, rinse to remove residual dispersion...

Embodiment 1

[0040]Expandable graphite (commercially available) was heat-shocked at 1000°C for 20 seconds to obtain expanded graphite; the obtained expanded graphite was subjected to high-speed shear stirring (2400r / min) in absolute ethanol for 30 minutes and then ultrasonically treated (80 kHz, 100 W) for 12 hours, filtered, washed, and dried at 80°C to obtain graphite nanosheet powder. The particle size of the obtained nano graphite flake powder is 3-20μm, the thickness is 20-80nm, the average particle size is about 15μm, the average thickness is about 50nm, it has a large diameter-thickness ratio of about 300, and the periphery is irregular. . Under normal temperature and pressure, put the nano-graphite micro-flakes into absolute ethanol to form an absolute ethanol solution containing 0.05wt% nano-graphite micro-flakes, and ultrasonicate at room temperature for 2 hours to obtain a uniformly dispersed nano-graphite micro-flakes. Suspend the ethanol solution, then add high-swellable bact...

Embodiment 2

[0043] Expandable graphite (commercially available) was heat-shocked at 900°C for 15 seconds to obtain expanded graphite; the resulting expanded graphite was subjected to high-speed shear stirring (2400r / min) in absolute ethanol for 20 minutes and then ultrasonically treated (80 kHz, 100 W) for 10 hours, filtered, washed, and dried at 100°C to obtain graphite nanosheet powder. Under normal temperature and pressure, put the nano-graphite micro-flakes into absolute ethanol to form an absolute ethanol solution containing 0.05wt% nano-graphite micro-flakes, and ultrasonicate at room temperature for 2 hours to obtain a uniformly dispersed nano-graphite micro-flakes. Suspend the ethanol solution, then add high-swelling bacterial cellulose wet film to it, and ultrasonically take it out for 6 hours at room temperature to obtain a finished bacterial cellulose conductive composite film with a thickness of about 38 microns. The bacterial cellulose film content in the composite film is mea...

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Abstract

The invention relates to a conductive composite thin film based on a bacterial cellulose template, in particular to an inorganic nonmetallic nano particle / bacterial cellulose conductive composite thin film and a preparation method thereof, which belong to the field of inorganic nonmetallic nano material and biological polymer nano material composition. The invention is characterized in that: based on the unique superfine porous three-dimensional (3D) network structure and high-density (hydroxyl) of bacterial cellulose, inorganic nonmetallic conductive nano particles are physically wound on and chemically bonded with a bacterial cellulose thin film. The method has the advantages that: the cost is low; the need of special and expensive toxic surfactant is obviated; the preparation process is very simple and easy to implement; the preparation technique can be controlled; the industrial implementation is easy; and the like. Besides the high physical, mechanical and processing properties of the original bacterial cellulose, the prepared composite thin film has high conductivity and has wide application prospect in field of electrode materials (such as fuel battery electrode materials)and the like.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic non-metallic nanometer materials, in particular to a bacterial cellulose conductive composite film and a preparation method thereof. Background technique [0002] Bacterial cellulose (BC) is a kind of cellulose produced by bacteria. It is composed of ribbon nanofibers (<100nm wide) interconnected by a large number of hydrogen bonds to form an extremely unique ultra-fine porous 3D network structure, so this kind of The gel-like bacterial product has extremely high porosity and specific surface area; compared with plant cellulose, BC does not contain impurities such as lignin, hemicellulose, and pectin, so it has extremely high purity. Since each BC nanofiber is a cellulose microfibril bundle composed of semi-crystalline extended cellulose chains, their axial thermal expansion rate is very small (1ppm / K, close to glass), Young's modulus (138GPa) and Tensile strength (>2GPa) is almost e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/00C08J7/12C08L1/02C08K3/04
Inventor 周天乐
Owner NANJING UNIV OF SCI & TECH
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