Carbon Microspheres Synthesized By Hydrothermal Method And Performance Studies

With the fullerenes, carbon nanotubes was found in the carbon-based materials for research into the extent of the white-hot, this is because the carbon-based materials with good thermal conductivity, such as the physical properties, is a very good quality materials. Therefore, to improve yield and reduce the cost of the experiment is the synthesis of carbon-based materials are two key factors.With different sizes microspheres have been successfully synthesized using autoclave by hydrothermal method, utilizing glucose as the carbon source. A systematic study of the effect of the reaction temperatures and time on the morphology of the obtained microsphere was also conducted in this thesis. Scanning Electron Eicroscope(SEM), IR and X-ray diffraction were used to characterize the product. The results showed that the sample using glucose as starting material at 180℃,6h which has better morphology through the SEM image. The surface of the spheres is hydrophilic, being functionalized with OH and C=O groups. Coating the spheres with noble-metal nanoparticles could endow the spheres with specific catalytic, magnetic, electronic, optical, or optoelectronic properties, utilizing the functional groups of the sphere in the surface. Eliminate the need for surface activation steps, provide a good pre-conditions for some field, such as load noble metal or catalysis.Use glucose as the carbon source, adding a certain percentage of the ferrous through different kind of surfactants to control the morphology of the product. The surface smooth and uniform size of the carbon composite material was obtained in the appropriate parameter. And Fe₃O₄ magnetic particles appeared, furthermore, amorphous carbon transformation to the graphite after carbonization in inert gases. The morphology of spheres has not been damaged. In other word, through only one step will be obtain the magnetic graphite microspheres. The results show that the proportion of magnetic particles is about 35% in all.At present, the carbon-based composite materials as a very important material has aroused widespread concern in the field of research. In the metal/carbon composite, carbon-coated not only can be avoided metal nanoparticles reunion, but also rule out the environmental impact of metal. As the result of the carbon protection and isolation of air to air in the medium make the metal nanoparticles in long-term keeping stability. Metal/carbon composite materials show the superiority of the great and broad application prospects in many field, such as catalyst support, magnetic separation, targeted drug delivery, hydrogen storage, environmental protection, electrode materials.