纳米材料的结构Ⅰ:四氟化硅纳米粒子的结构(英文)

Structure of Nanometer-size Materials ⅠStructure of Silicon Tetrafluoride Nanoparticles

通过超声膨胀产生了直径约为4．3nm的SiF4纳米粒子，并用电子衍射表征其结构．在选择的射流部分中，粒子大小的分布是很窄的，因而可以用541个分子构成的分子簇进行结构精化．在SiF4的纳米粒子中，分子的堆积可用大块物质的立方晶体结构来模拟.还谈到纳米粒子表面上由于平动和转动运动引起的分子混乱．

Nanoparticles of silicon tetrafluoride (SiF4 ) with diameter ～ 4. 3nmwere generated from supersonic expansions and structurally characterized by elec-tron diffraction. The distribution of particle size in a selected portion of a jet is nar-row which allows the structure refinement based on a cluster with 541 molecules.The packing of SiF4 molecules in the nanoparticle can be modeled by the bulk cubiccrystal structure. Dislocations of molecules due to translational and orientationalmotions in the surface of the nanoparticles are addressed.