tailieunhanh - Báo cáo hóa học: "A Two-Step Hydrothermal Synthesis Approach to Monodispersed Colloidal Carbon Spheres"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research A Two-Step Hydrothermal Synthesis Approach to Monodispersed Colloidal Carbon Spheres | Nanoscale Res Lett 2009 4 971-976 DOI S11671-009-9343-5 NANO EXPRESS A Two-Step Hydrothermal Synthesis Approach to Monodispersed Colloidal Carbon Spheres Chuyang Chen Xudong Sun Xuchuan Jiang Dun Niu Aibing Yu Zhigang Liu Ji Guang Li Received 19 March 2009 Accepted 6 May 2009 Published online 21 May 2009 to the authors 2009 Abstract This work reports a newly developed two-step hydrothermal method for the synthesis of monodispersed colloidal carbon spheres CCS under mild conditions. Using this approach monodispersed CCS with diameters ranging from 160 to 400 nm were synthesized with a standard deviation around 8 . The monomer concentration ranging from to M is in favor of generation of narrower size distribution of CCS. The particle characteristics . shape size and distribution and chemical stability were then characterized by using various techniques including scanning electron microscopy SEM FT-IR spectrum analysis and thermalgravity analysis TGA . The possible nucleation and growth mechanism of colloidal carbon spheres were also discussed. The findings would be useful for the synthesis of more monodispersed nanoparticles and for the functional assembly. C. Chen X. Sun H X. Jiang Z. Liu J. G. Li Key Laboratory for Anisotropy and Texture of Materials Ministry of Education School of Materials and Metallurgy Northeastern University 110004 Shenyang China e-mail xdsun@ C. Chen X. Jiang A. Yu School of Materials Science and Engineering University of New South Wales 2052 Sydney NSW Australia D. Niu School of Science Northeastern University 110004 Shenyang China J. G. Li National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan Keywords Two-step hydrothermal synthesis Monodispersed colloids Colloidal carbon sphere Glucose Introduction Carbon-based material is one kind of the most important functional materials because of its unique electromagnetic thermodynamical and mechanical properties 1-3 that exhibit .