Preparation of hollow carbon-microbeads from water-in-oil emulsion using amphiphilic carbonaceous material

Abstract

Abstract Carbon microbeads were prepared from water-in-oil emulsion using amphiphilic carbonaceous material and urea. With urea as a forming agent with a concentration 1–20 wt.%, hollow carbon-microbeads were obtained, and their particle size ranged between 2 and 15 μm. The true density of the hollow carbon-microbeads was changed, by varying the concentration of urea and the heat-treatment temperature. In particular, a pore size of about 50 A was predominantly produced under a certain condition.