A kind of bacterial cellulose/graphene/ferric oxide composite film and preparation method thereof

A bacterial cellulose membrane and bacterial cellulose technology are applied in the field of bacterial cellulose/graphene/iron tetroxide composite membrane and its preparation, which can solve the problem that bacterial cellulose and graphene oxide are difficult to mix evenly, and the concentration of lyotropic liquid crystals It is not easy to control, the conductive polymer is easy to fall off, etc., to achieve the effect of adjustability, mechanical strength, and stable electrical conductivity.

Inactive Publication Date: 2017-08-04
南京荣之盛生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts oxidative polymerization reaction, there are many influencing factors, the conditions are not easy to control, and the coated conductive polymer is easy to fall off.
[0006] Document 2 (Huhu Cheng, etc.. Graphene fiber: a new material platform for unique applications. NPG Asia Materials, 2014, 6: 1884-4057) reported that a wet spinning method prepared graphene fibers, the prepared The obtained fiber shows good conductivity, flexibility and tensile strength, but using graphene alone not only increases the preparation cost, but also the concentration of lyotropic liquid crystal is not easy to control
[0007] In the prior art, due to the effect of hydroxyl groups on the surface of bacterial cellulose, graphene is easy to agglomerate when mixed with bacterial cellulose, and cannot be well dispersed
Although graphene oxide can be dispersed in an aqueous solvent, the aqueous solvent of bacterial cellulose contains high concentrations of sodium hydroxide and salts, which cause graphene oxide to precipitate due to the salt effect, making bacterial cellulose and graphene oxide difficult to obtain. well mixed

Method used

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  • A kind of bacterial cellulose/graphene/ferric oxide composite film and preparation method thereof
  • A kind of bacterial cellulose/graphene/ferric oxide composite film and preparation method thereof
  • A kind of bacterial cellulose/graphene/ferric oxide composite film and preparation method thereof

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Effect test

Embodiment 1

[0030] The pure bacterial cellulose film was vacuum-dried at room temperature for 12h to prepare bacterial cellulose airgel, and the airgel was ground into powder, and then the bacterial cellulose powder was dispersed in LiCl with an amount of 4% (w / v) In the DMAc / LiCl mixed solvent, a clear bacterial cellulose solution with a mass concentration of 2% was obtained through freezing, thawing and heating. The freezing temperature is -10°C, the thawing temperature is room temperature, and the heating temperature is 80°C. Weigh 10% graphene oxide with a mass of bacterial cellulose powder and iron ferric oxide nanoparticles with a mass of 40% bacterial cellulose powder, and uniformly disperse them in N,N-dimethylformaldehyde with the same volume as the bacterial cellulose solution In base acetamide, then mixed with a clarified bacterial cellulose solution, after ultrasonic degassing for 15min, a clarified bacterial cellulose / graphene oxide / ferric oxide mixed solution was obtained, a...

Embodiment 2

[0033]The pure cellulose film was vacuum-dried at room temperature for 12h to prepare bacterial cellulose airgel, and the airgel was ground into powder, and then the bacterial cellulose powder was uniformly dispersed in LiCl with an amount of 8% (w / v ) in the DMAc / LiCl mixed solvent, through freezing, thawing and heating to obtain a clear bacterial cellulose solution with a mass concentration of 2%. The freezing temperature is -5°C, the thawing temperature is room temperature, and the heating temperature is 80°C. Weigh 20% graphene oxide with a mass of bacterial cellulose powder and iron ferric oxide nanoparticles with a mass of 40% bacterial cellulose powder, and uniformly disperse them in N,N-dimethylformaldehyde with the same volume as the bacterial cellulose solution In base acetamide, then mixed with clarified bacterial cellulose solution, ultrasonically degassed for 15 minutes to obtain a clarified bacterial cellulose / graphene oxide mixed solution, and then used an elect...

Embodiment 3

[0036] The pure cellulose film was vacuum-dried at room temperature for 12h to prepare bacterial cellulose airgel, and the airgel was ground into powder, and then the bacterial cellulose powder was uniformly dispersed in LiCl with an amount of 8% (w / v ) in the DMAc / LiCl mixed solvent, through freezing, thawing and heating to obtain a clear bacterial cellulose solution with a mass concentration of 2%. The freezing temperature is -5°C, the thawing temperature is room temperature, and the heating temperature is 80°C. Weigh 30% graphene oxide with a mass of bacterial cellulose powder and iron ferric oxide nanoparticles with a mass of 50% of bacterial cellulose powder, and uniformly disperse them in N,N-dimethylformamide with the same volume as bacterial cellulose solution. In base acetamide, then mixed with clarified bacterial cellulose solution, ultrasonically degassed for 15 minutes to obtain a clarified bacterial cellulose / graphene oxide mixed solution, and then used an electro...

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Abstract

The invention discloses a bacterial cellulose/graphene/ferroferric oxide composite film. Bacterial cellulose/graphene oxide /ferroferric oxide electrostatic spinning nanofibers are self-assembled, cured, reverted and carbonized to form the composite film. Graphene and ferroferric oxide in the composite film are evenly scattered in a bacterial cellulose nanofiber matrix; the graphene oxide with the better dispersity is used as a raw material and then reverted into graphene, and meanwhile DMAC/LiCl is used as a spinning solvent to evenly mix the bacterial cellulose and the graphene oxide. The preparation method is simple, layer-by-layer self-assembly of the composite nanofibers is achieved by changing the wrapping angle of tin paper on a roller to form the film, the composite film is adjustable in precision, and therefore the mechanical strength can be adjusted and controlled. The bacterial cellulose/graphene/ferroferric oxide composite film has the good biocompatibility, and can be applied to the fields of lithium ion battery cathode materials, supercapacitor, tissue engineering and biological sensor coated materials and the like.

Description

technical field [0001] The invention relates to a bacterial cellulose / graphene / ferric oxide composite membrane and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] Bacterial cellulose is a polysaccharide produced by some bacteria. Compared with plant cellulose, bacterial cellulose has higher purity, tensile strength and higher Young's modulus. In addition, its The unique properties such as good biocompatibility and degradability make it widely used in many fields such as biomedicine, tissue engineering, food and textiles. Improving the conductivity of bacterial cellulose can broaden its application fields. Graphene has unique physical and chemical properties and can be used as a conductive doping component to improve the conductivity of substances. [0003] In recent years, various methods of compounding bacterial cellulose and conductive substances, including doping, surface coating, suction filtration, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F2/00D01F1/10D01D5/06
Inventor 黄洋自强张衡陈春涛孙汴京杨加志朱春林
Owner 南京荣之盛生物科技有限公司
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