【摘要】 采用脉冲激光轰击法连续制备纳米钨及脂肪醇聚氧乙烯醚(平平加O)原位修饰的油溶性纳米钨,用紫外可见吸收光谱(UV-Vis)、荧光光谱、傅里叶红外光谱(FT-IR)、X射线衍射(XRD)和透射电子显微镜(TEM)等对其结构和性质进行表征.UV-Vis结果表明,纳米钨乙醇溶胶在230.00和275.00 nm附近有强吸收;荧光光谱显示,纳米钨乙醇溶胶在最佳激发波长光(310 nm)下发出强荧光;FT-IR发现,纳米钨乙醇溶胶中乙醇分子基团振动波长受纳米钨颗粒的影响而出现红移现象;XRD和透射电镜发现,修饰过的纳米钨颗粒粒径约为5 nm,未修饰纳米钨颗粒粒径约为18 nm.通过UV-Vis及TEM研究添加剂平平加O对纳米钨溶胶分散稳定性的影响,结果表明平平加O表面修饰有效抑制了纳米钨颗粒的团聚,并使纳米钨具有良好的油容性.更多还原

【Abstract】 The nano tungsten and the nano tungsten with surface-modification of peregal-O were continuously prepared by pulsed laser ablation.The ultraviolet visible spectroscopy(UV-vis) results showed that there were two strong absorption peaks in 230.00 nm and 275.00 nm.Their fluorescence spectroscopy(FS) exhibited strong emitting fluorescence peaks in 344 nm and 408 nm at the optimal wavelength,310 nm.It was found through FT-IR that the vibrations of the ethanol molecule groups in the sol present red shift by the influence of the nano tungsten particles.XRD and TEM results showed that the average diameter of the modified nano tungsten particles was 5 nm,and that of the non-modified nano tungsten particles was 18 nm.The influence of peregal-O on the dispersion stability of nano tungsten/ethanol sol was studied by UV-vis and TEM.The results showed that the surface-modification of peregal-O for the nano tungsten particles could effectively inhibit their coacervation,and make the nano tungsten particles easily disperse in the oil.更多还原