Research On The Spectrum And Regulation Of Colloidal Carbon Sphere Produced From Glucose

Carbon material is one of the materials that human beings has recognized and used since a long time ago. It is rich on the Earth. The carbon material has become an essential material and plays an important role in the whole society.The research on the applications of carbon material has a long history and now the results have been widely applied in the field of tires, batteries, catalysts and catalyst supports, electrodes, optical, etc.There are many kinds of carbon materials, such as diamond, carbon nanotubes, graphene and so on. Colloidal carbon sphere was first synthesized in 2004 and from then on it had been attracting the attention of researchers.Now the research results have made a breakthrough in the field of green templates, drug delivery, electrodes. In this paper we produce colloidal carbon material with glucose as the carbon source in a water bath at 95℃environment and use sulfuric acid as dehydrating agent and catalyst. Finally we get colloidal carbon spheres at atmospheric pressure.Among the characteristics of the carbon material morphology, particle size is a very important factor used to measure the properties of materials. The reason why the particle size receives so much attention is that the particle size of the materials has a certain impact on many mechanical, thermal, electronic characters of materials. In the long course of the study, people tend to regulate the particle size in the preparation processes. Although this method has many advantages such as uniform shape and controllable particle size, there are also obvious limitations. With the end of the preparation process, the particle size is fixed and can not be regulated again which greatly limits the use of colloidal carbon materials. To overcome this limitation, we propose a newregulatory method. By dispersing colloidal carbon material in an aqueous solution and changing the p H value of the solution, we achieve the purpose of regulation. Experimental results show that this method not only achieves the circular regulation but also has a strong ability to control the particle size. In fact, the particle size is basically the same after many cycles. At last we explain the adjustment process using DLVO theory.On the basis of p H regulation, we consider that there are many strict limits to the p H value in certain cases. So the above method can not be achieved.We propose a new method by changing the ionic strength for this problem. We achieve this purpose by adding salt to the colloidal carbon solution. The colloidal carbon particle size increases with ionic strength increasing. The increasing degree of particle size belongs to the increasing degree of ionic strength.The results of this paper provide a new way to regulate the particle size of carbon materials and are contributed to expand the scope of carbon application.