【摘要】 以钛酸四丁酯为钛源,以一种水性凝胶剂,3-{[（2S）-2-（十八酰胺基）-3-苯丙基]酰胺基}丁羧酸四乙胺盐(简记为TC₁₈PheBu)在水溶液中自组装形成的聚集体为模板,经溶胶-凝胶缩聚、煅烧得到一种项链状TiO₂纳米颗粒.FE-SEM分析表明所制得的项链状TiO₂纳米颗粒直径约为200～400nm.采用FT-IR技术探讨了TiO₂纳米颗粒形成机理,即在钛酸四丁酯水解形成的带负电的低聚物与TC₁₈PheBu中季铵盐正离子之间,通过静电相互作用自组装形成纳米颗粒.XRD图谱表明TiO₂纳米颗粒为锐钛矿晶型二氧化钛.更多还原

【Abstract】 The necklace-like TiO₂ nanoparticles were prepared by a sol-gel polymerization and subse- quent calcinations.The aggregates of hydrogelator,tetraethylammonium 3-{[（2S）-2-（octadecylamino）- 3-phenylpropanoyl]amino}butyrate(abbreviated as TC₁₈PheBu)in aqueous solution were used as the templates and tetrabutyl titanate（Ti（OBu）₄）was used as the source of titanium in the preparation of necklace-like TiO₂ nanoparticles.The images of FE-SEM indicated that the average diameters of TiO₂ nanoparticles were in the range of 200-400nm.The formation mechanism of necklace-like TiO₂ nanoparticles was discussed by FT-IR analysis,which indicated that the necklace-like TiO₂ nanoparticles were formed through the electrostatic interaction between positive charged TC₁₈PheBu and negative charged oligomers formed by the hydrolysis of Ti（OBu）₄.The XRD analysis indicated that the TiO₂ nanoparticles were in the form of anatase crystals.更多还原