Cellulose/graphene oxide composite film and preparing method thereof

Abstract

The invention provides a cellulose / graphene oxide composite film and a preparing method thereof.The preparing method comprises the following steps that firstly, cellulose aerogel is dispersed in an amide solvent, and a mixed solution is obtained; secondly, the mixed solution and a graphene oxide aqueous solution are mixed, vacuum filtration is carried out, and the cellulose / graphene oxide composite film is obtained.Compared with the prior art, the amide solvent serves as a solvent, and the network structure of cellulose aerogel is smashed and dissolved to obtain small cellulose micro-network structure bodies; after the small cellulose micro-network structure bodies are mixed with the graphene oxide aqueous solution, the mass cellulose micro-network structure bodies are pressed into a two-dimensional plane network with air pressure in the vacuum filtration process, the two-dimensional plane network serves as a supporting framework for sedimentation and loading of graphene oxide nanosheet patch layers, the cellulose / graphene oxide composite film with high mechanical strength is obtained after multilayer assembling, and the by means of the preparing method, high-degree micro combination of cellulose and graphene oxide is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a cellulose / graphene oxide composite film and a preparation method thereof. Background technique [0002] Graphene is a carbon atom with sp 2 The hybridized orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom. Since its discovery in 2004, this unique material has attracted widespread attention due to its multiple excellent properties. [0003] There are currently a few methods for the preparation of graphene oxide and bacterial cellulose composite membranes, which are mainly divided into two methods: in-situ composite and ex-situ composite. The in-situ composite preparation is mainly to add graphene oxide directly to the growth medium of bacterial cellulose, and wrap graphene oxide directly in its three-dimensional network as the microorganisms produce cellulose. However, it...

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Problems solved by technology

However, it is difficult to control the preparation process of this method. The graphene oxide solution is usually acidic, and changing the pH of the culture solution after adding it will significantly affect the activity of microorganisms, thereby affecting the production of bacterial cellulose.

In addition, it is difficult to control the thickness and surface smoothness of the composite film prepared by in-situ composite, especially in the process of directly drying the thin bacterial cellulose-graphene oxide composite hydrogel film when preparing a thin composite film. film of

[0004] Another kind of heterotopic compounding is usually to make the bacterial cellulose hydrogel block into a homogenate, then mix it with the graphene oxide dispersion and filter it to form a film, or directly soak the gel block in the graphene oxide solution Middle; even if the bacterial cellulose in the process of this method is homogenized, it is still a large-sized cellulose aggregate, the structure of the hydrogel is stable, and graphene oxide is difficult to penetrate into the interior of the three-dimensional network, making its internal three-dimensional network The structure cannot be fully exploited to achieve a high degree of microscopic recombination

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