Method for producing carbon material using subcritical or supercritical fluid

Abstract

The present invention discloses a method for producing a carbon material using a subcritical or supercritical fluid that can efficiently produce dispersed graphene or the like in a short time by using a subcritical or supercritical fluid in a process of pulverizing a carbon material. The method for producing a carbon material using a subcritical or supercritical fluid includes: physically pulverizing a carbon material formed by covalently bonding carbon atoms; flowing a subcritical or supercritical fluid into the pulverized carbon material to make The step of increasing the carbon interval inside the carbon material, reacting the pulverized carbon material with a subcritical or supercritical fluid to form an active group in the carbon material; and dispersing the carbon material with the active group formed in the solvent step.

Description

technical field [0001] The present invention relates to a method for producing a carbon material using a subcritical or supercritical fluid. More specifically, it relates to a method for efficiently producing dispersed graphite in a short time by using a subcritical or supercritical fluid in a process of pulverizing a carbon material A method for producing carbon materials such as alkenes using subcritical or supercritical fluids. Background technique [0002] Graphene is a carbon crystal in which carbon atoms are connected in a hexagonal honeycomb shape and has a two-dimensional sheet shape, and a plurality of plate-shaped graphenes are laminated to form graphite. Therefore, when graphite is exfoliated, sheet-like graphene composed of a single layer or a multilayer can be obtained. Graphene is a substance with both metallic and non-metallic properties. As a metal, it has higher electrical / electronic conductivity than copper and higher thermal conductivity than diamond. As ...

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Problems solved by technology

[0004] In order to improve this shortcoming, various graphene production methods are known. Among them, graphite and dry ice are put into a pulverizer and ball-milled (ball-milling), reacted to form carboxyl groups, and then dispersed in a solvent to produce graphene. (Thesis title: Edge-carboxylated graphene nanosheets via ball milling, Baek Jong-beom (Ulsan University of Science and Technology), published in: Proceedings of the National Academy of Sciences (PNAS), 2012.03.27, 109(15), 5588-5593p), the ball milling time is long, 48 hours, the free radicals inside the reactor remain, and when it comes into contact with air after the reaction, sparks such as electric sparks will occur, and there is a danger of explosion

In addition, it is also known that supercritical CO 2 A method of producing graphene by infusing polymer intercalation (intercalation) carbon to expand the interlayer space of carbon and then dispersing it in a solvent (X. Zheng, RSC Advances, 2012, 2, 10632-10638p), but in the method Medium, supercritical CO 2 Simply expand the interlayer space of carbon, in order to form functional groups such as carboxyl groups on the edge of carbon, it is necessary to add another acid (acid) treatment process

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