tailieunhanh - Báo cáo hóa học: " Structural Characterization of Mesoporous Silica Nanofibers Synthesized Within Porous Alumina Membranes"

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: Structural Characterization of Mesoporous Silica Nanofibers Synthesized Within Porous Alumina Membranes | Nanoscale Res Lett 2009 4 1257-1262 DOI s11671-009-9389-4 NANO EXPRESS Structural Characterization of Mesoporous Silica Nanofibers Synthesized Within Porous Alumina Membranes Zhihong Gong Guangbin Ji Mingbo Zheng Xiaofeng Chang Weijie Dai Lijia Pan Yi Shi Youdou Zheng Received 29 May 2009 Accepted 3 July 2009 Published online 14 July 2009 to the authors 2009 Abstract Mesoporous silica nanofibers were synthesized within the pores of the anodic aluminum oxide template using a simple sol-gel method. Transmission electron microscopy investigation indicated that the concentration of the structure-directing agent EO20PO70EO20 had a significant impact on the mesostructure of mesoporous silica nanofibers. Samples with alignment of nanochannels along the axis of mesoporous silica nanofibers could be formed under the P123 concentration of mg mL. When the P123 concentration increased to mg mL samples with a circular lamellar mesostructure could be obtained. The mechanism for the effect of the P123 concentration on the mesostructure of mesoporous silica nanofibres was proposed and discussed. Keywords Mesoporous silica Nanofiber Anodic aluminum oxide P123 Template synthesis Introduction Mesoporous materials with ordered nanochannels tunable pore size from 2 to 50 nm large surface area and high hydrothermal and thermal stability have rapidly sprang up since 1990s 1 2 . Numerous research works about Z. Gong G. Ji El M. Zheng X. Chang W. Dai Nanomaterials Research Institute College of Material Science and Technology Nanjing University of Aeronautics and Astronautics 210016 Nanjing People s Republic of China e-mail gbji@ G. Ji L. Pan Y. Shi Y. Zheng National Laboratory of Solid State Microstructure and Department of Physics Nanjing University 210093 Nanjing People s Republic of China mesoporous materials have been reported such as SiO2 3 4 TiO2 5 6 carbon 7 8 NiO 9 10 and ZnO 11 12 . Among these materials mesoporous silica is widespread due to their .