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Graphene/bacterial cellulose composite material with gradient structure and preparation method thereof

A technology of bacterial cellulose and composite materials, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of single structure and inability to prepare graphene composite materials with gradient structure, and achieve simple preparation process , inhibition of graphene agglomeration, process safety effect

Active Publication Date: 2018-12-28
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Considering that the structure of the existing graphene composite materials is relatively simple, which has limitations in simulating complex biological tissues and the development of bionics, the existing technology cannot prepare graphene composite materials with gradient structures.

Method used

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  • Graphene/bacterial cellulose composite material with gradient structure and preparation method thereof
  • Graphene/bacterial cellulose composite material with gradient structure and preparation method thereof
  • Graphene/bacterial cellulose composite material with gradient structure and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. Using graphene dispersion and bacterial cellulose as raw materials, a graphene / bacterial cellulose composite material with a gradient structure was prepared by using a membrane-liquid interface culture method. Specific steps are as follows:

[0027] Step 1. Preparation of medium: Add glucose (25g / L), yeast powder (7.5g / L), peptone (10g / L) and disodium hydrogen phosphate (10g / L) to a beaker containing 1000ml ultrapure water in sequence Stir until it is completely dissolved; use glacial acetic acid to adjust the pH value of the system to 4-5 to prepare a medium, put it in a sterilizer and sterilize it at 115°C and 0.1MPa for 30min to obtain the uninoculated Culture medium, spare;

[0028] Step 2, prepare three kinds of mixed media with different volume ratios:

[0029] Preparation of graphene dispersion: prepare a graphene dispersion with a mass volume concentration of 1 mg / ml in deionized water, sonicate for 15 minutes, and sterilize with ultraviolet light; ...

Embodiment 2

[0034] Example 2. Using graphene dispersion and bacterial cellulose as raw materials, a graphene / bacterial cellulose composite material with a gradient structure was prepared by using a membrane-liquid interface culture method. Specific steps are as follows:

[0035] Step 1, preparation culture medium: with embodiment 1;

[0036] Step 2, prepare three kinds of mixed culture mediums with different volume ratios: the preparation process is basically the same as in Example 1, the difference is only: the graphene dispersion and the culture medium volume ratios prepared in this Example 2 are respectively 1:7, 1: 3 and 2:1 (that is, the concentration of graphene is 0.125mg / ml, 0.25mg / ml, 0.67mg / ml respectively) three kinds of mixed medium; ultrasonic 15min, make the graphene flake particles evenly dispersed in in culture medium;

[0037] Step 3, preparation of basement membrane: same as Example 1;

[0038] Step 4, spray the above-mentioned three kinds of mixed culture mediums wit...

Embodiment 3

[0040] Example 3. Using graphene oxide dispersion liquid and bacterial cellulose as raw materials, a graphene oxide / bacterial cellulose composite material with a gradient structure was prepared by using a membrane-liquid interface culture method. Specific steps are as follows:

[0041] Step 1, preparation culture medium: with embodiment 1;

[0042] Step 2, prepare three kinds of mixed media with different volume ratios: the preparation process is basically the same as in Example 1, the difference is only: the graphene dispersion wherein is a graphene oxide dispersion whose mass volume concentration is 2mg / ml; this implementation In Example 3, the volume ratios of the graphene oxide dispersion to the culture medium were 1:39, 1:7, and 1:3 (that is, the graphene oxide concentrations were 0.05mg / ml, 0.25mg / ml, and 0.5mg / ml, respectively). Mixed medium with three ratios; ultrasonic for 15 minutes, so that the graphene oxide flake particles are evenly dispersed in the medium;

[...

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Abstract

The invention discloses a preparation method of a graphene / bacterial cellulose composite material with a gradient structure. A membrane liquid interface culture method is adopted. The preparation method mainly comprises preparing a culture medium and preparing a base membrane for culturing graphene / bacterial cellulose as a membrane liquid interface; preparing mixed media of graphene / nonvaccinatedmedia in various volume ratios (concentrations); spraying the mixed media of the grapheme in different concentrations in the mist form to the base membrane for multiple times according to the change of the concentration of the graphene in the mixed media from low to high based on the spraying sequence to achieve membrane and liquid contact. The next spraying is conducted each time after the mixedmedia on the membrane surface are consumed, so that the grapheme / bacterial cellulose composite material with the ratio of the graphene and the bacterial cellulose in the gradient change in the thickness direction is formed. The composite material can provide materials for preparing novel advanced materials such as biomimetic biomaterials, electromagnetic gradient materials and conductive gradientfunctional materials.

Description

technical field [0001] The invention relates to a graphene / bacterial cellulose composite material with a gradient structure and a preparation method thereof. Background technique [0002] During long-term evolution and selection, organisms have subtly evolved functional gradients and heterogeneity under the conditions of rather limited elements and compounds to choose from, thus creating high-performance biomaterials. Gradients play an integral role in the survival and development of organisms. For example, natural (bio)materials are often composites with spatial gradients and tunable properties. Natural (bio)materials utilize their gradients to enhance a range of properties and functions, including load-bearing and support capabilities, interfacial strengthening, toughening, and non-mechanical functions. Inspired by biological materials in nature, it is recognized that the introduction of spatial gradients can effectively improve the mechanical and functional properties o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/04C08L1/04C08K3/04C08K7/24C08K3/38C08K7/00C08J5/18C12R1/02
CPCC12P19/04C08J5/18C08K3/046C08K3/041C08K3/042C08J2301/04C08K7/00C08K2201/011C08K2003/387C08K3/04
Inventor 万怡灶刘金枝张全超杨志伟敖海勇胡剑罗红林崔腾
Owner EAST CHINA JIAOTONG UNIVERSITY
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