Oxidizing agent controllable adding device capable of improving quality of graphene in batch preparation

Abstract

The invention discloses an oxidizing agent controllable adding device capable of improving quality of graphene in batch preparation and relates to production of graphene. The device is provided with a feed bin and an air-material feed pipeline, wherein a feed port is formed in an upper opening of the feed bin; a screen and a valve are mounted at the lower end of the feed bin; the valve is connected with the air-material feed pipeline; one end of the air-material feed pipeline is communicated with a reaction chamber; a safety valve is arranged at the middle of the air-material feed pipeline; and a pipeline interface is arranged at the other end of the air-material feed pipeline and externally connected with a gas inlet. The gas pressure and flow are controlled through a pulse air injection way to further control the feed amount of the oxidizing agent powder and realize control on the feed ratio. The pipeline interface is arranged at one end of the air-material feed pipeline and can be eternally connected with air injection pipelines different in size so as to realize different feeding rates.

Description

technical field [0001] The invention relates to the production of graphene, in particular to an oxidant controllable addition device capable of improving the quality of graphene prepared in batches. Background technique [0002] Graphene is a two-dimensional material with a single atomic layer stacked by carbon atoms in a honeycomb shape. It has excellent performance in many fields such as mechanics, electricity, and heat. This makes graphene widely used in energy, national defense, and medicine. aspects are valued and rapidly researched. However, the large-scale synthetic production of high-quality graphene has been a bottleneck limiting its industrial application. Although a variety of graphene synthesis methods have been developed such as oxidation-reduction method, mechanical exfoliation method, vapor phase deposition method, electrochemical exfoliation method, etc., due to problems such as cost, equipment, and safety, other methods except oxidation-reduction method It...

AI Technical Summary

Problems solved by technology

If the oxidant concentration is too high, the resulting graphene will have many defects and its performance will also deteriorate

Especially in large-scale production, the traditional oxidant addition method cannot make the oxidant concentration uniform in a short time, and it will also cause the phenomenon of over-oxidation and under-oxidation of part of the expanded graphite, which seriously affects the uniformity of the final graphene product.

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