氮掺杂对a-C:F薄膜表面形貌和键结构的影响

用射频等离子体增强化学气相沉积设备制备了氮掺杂a-C:F(氟化非晶碳)薄膜,研究了不同氮源流量比对薄膜表面形貌和键结构的影响。AFM观察结果发现:随氮流量的增加,薄膜表面粗糙度降低,颗粒粒径变小,薄膜更加均匀致密。Raman光谱分析表明:氮源流量的增加会引起薄膜内sp2键态含量增加,即芳香环式结构比例上升,当r(N2/(CF4+CH4+N2))为68%时,ID/IG由未掺N2时的1.591增至4.847,薄膜的热稳定性增强。     

Preparation and characterization of biocompatible Nb-C coatings

Nb-C composite films, obtained by DC magnetron sputtering method, were investigated as possible candidates for the protective layers used in medical implants. Coatings of different carbon/niobium ratios were prepared and analyzed for elemental and phase composition, crystallographic structure, texture, corrosion behavior, and cell viability. The coating with the highest C/Nb ratio (≈ 1.9) was found to have a nanocomposite structure, in which NbC nanocrystalline phase coexists with an amorphous a-C one. The coated samples exhibited an improved corrosion resistance as compared with the Ti alloy. Cell viability measurements proved that human osteosarcoma cells are adherent to the coating surfaces, the highest viability being found for the film with the highest carbon content.     

无机陶瓷膜修饰技术进展

综述了几种用于减小无机陶瓷膜孔径的修饰技术，其中重点介绍了溶胶－凝胶法和化学气相沉积法。     

Measurement of Local Si‐Nanowire Growth Kinetics Using In situ Transmission Electron Microscopy of Heated Cantilevers

A technique to study nanowire growth processes on locally heated microcantilevers in situ in a transmission electron microscope has been developed. The in situ observations allow the characterization of the nucleation process of silicon wires, as well as the measurement of growth rates of individual nanowires and the ability to observe the formation of nanowire bridges between separate cantilevers to form a complete nanowire device. How well the nanowires can be nucleated controllably on typical cantilever sidewalls is examined, and the measurements of nanowire growth rates are used to calibrate the cantilever‐heater parameters used in finite‐element models of cantilever heating profiles, useful for optimization of the design of devices requiring local growth.     

铌酸锌系微波介质陶瓷的研究进展

介绍了微波介质陶瓷改性研究的3种常见方法,即添加助烧剂、离子取代和陶瓷复合化,综述了近几年来铌酸锌系微波介质陶瓷的研究进展.探讨了铌酸锌系微波介质陶瓷研究中存在的问题和未来的发展趋势.     

膜分离技术在酱油过滤中的应用研究

本利用不同孔径无机膜和有机膜过滤设备，对酱油进行过滤试验，比较了几种常用过滤设备过滤速度，产量和生产成本等。结果表明：膜过滤虽然成本相对较高，但应用于酱油生产中是可行的，孔径为1．2μm的无机陶瓷膜过滤机较好。     

水性聚氨酯技术进展

讨论了水性聚氨酯原材料及其特点,水性聚氨酯制备方法,以及未来可能的发展趋势。重点讨论了结构与性能之间的关系。