Catalysis Center for Energy Innovation, Center for Catalytic Science and Technology, Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716-3111, USA.
Dalton Trans. 2012 Jun 21;41(23):6914-8. doi: 10.1039/c2dt30248a. Epub 2012 Apr 25.
By controlling the interaction between cationic surfactant micelles and ammonium metatungstate during the formation of mesoporous silica structure, highly dispersed tungsten carbide (WC) nanoparticles of 2.0 nm in diameter on mesoporous silica nanospheres were synthesized at lower concentration of ammonium metatungstate. With additional ammonium metatungstate, a novel mesoporous silica nanobamboo structure was formed with bimodal size-distributed WC nanoparticles, in which 2.0 nm WC was homogeneously distributed in nanobamboo's mesoporous silica wall and those with larger diameter (10.0-20.0 nm) were only formed on the nanobamboo's inner surface and at its internodes. The mesoporous silica nanobamboo also had a very high tensile strength due to its bamboo-like structure.
通过控制介孔硅结构形成过程中阳离子表面活性剂胶束与偏钨酸铵之间的相互作用，在较低浓度的偏钨酸铵条件下，于介孔硅纳米球上成功合成了粒径为 2.0nm 的高分散碳化钨（WC）纳米颗粒。而当增加偏钨酸铵用量时，会形成一种新颖的介孔硅纳米竹结构，其中具有双峰尺寸分布的 WC 纳米颗粒，2.0nm 的 WC 均匀分布在纳米竹的介孔硅壁中，而较大直径（10.0-20.0nm）的 WC 仅在纳米竹的内表面及其节间形成。由于其竹状结构，介孔硅纳米竹还具有非常高的拉伸强度。
