物理化学学报 >> 2006, Vol. 22 >> Issue (06): 737-743.doi: 10.1016/S1872-1508(06)60030-2

研究论文 上一篇    下一篇

溶致液晶中金属纳米粒子的掺杂及其作用机制研究

隋震鸣;陈晓;王庐岩;许丽梅;杨春杰   

  1. 山东大学胶体与界面化学教育部重点实验室, 济南 250100; 济南大学化学与化工学院, 济南 250022
  • 收稿日期:2006-01-11 修回日期:2006-03-10 发布日期:2006-05-31
  • 通讯作者: 陈晓 E-mail:xchen@sdu.edu.cn

Study on the Doping and Interactions of Metal Nanoparticles in the Lyotropic Liquid Crystals

SUI Zhen-Ming;CHEN Xiao;WANG Lu-Yan;XU Li-Mei;YANG Chun-Jie   

  1. Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China; School of Chemistry and Chemical Engineering, Jinan University, Jinan 250022, P. R. China
  • Received:2006-01-11 Revised:2006-03-10 Published:2006-05-31
  • Contact: CHEN Xiao E-mail:xchen@sdu.edu.cn

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摘要： 在用琥珀酸二异辛酯磺酸钠(AOT)构建的具有长程有序结构的层状溶致液晶内, 用不同方式导入预制的亲油或亲水贵金属纳米粒子, 可得到纳米粒子分布在不同介观空间内的无机/有机杂合体. 依据小角X射线散射和偏光显微镜结果, 通过分析掺杂纳米粒子与液晶模板的相互作用, 对掺杂前后体系结构的变化及制得杂合体的稳定性进行了表征. 结果表明, 除考虑掺杂粒子与层状模板空间的匹配外, 体系中静电斥力、范德华引力和Helfrich涨落力之间的平衡是维持液晶结构稳定的基本条件.

关键词: 溶致液晶, 层状相, 纳米粒子, 小角X射线散射

Abstract: The hydrophilic silver and hydrophobic gold nanoparticles are doped simultaneously or seperately into different regions of a lyotropic liquid crystal (LLC) with long-range structural order built with the AOT/isooctane/water ternary system. A stable lamellar hybrid is produced under suitable conditions. Polarized optical microscopy and small angle X-ray scattering are used to compare the phase changes upon various doping manners. The interactions between doped particles and surfactant bilayers are analyzed and compared in detail. Factors affecting the stability of inorganic/organic hybrids are also discussed. The doped hydrophobic particles affect the equilibrium of van der Waals and Helfrich interactions between them and the membranes. When hydrophilic particles are incorporated into LLC aqueous region, electrostatic force will be dominant. The results suggest that it is the balance of electrostatic, van der Waals, and Helfrich forces in the lyotropic liquid crystal that determine the hybrid structure.

Key words: Lyotropic liquid crystal, Lamellar phase, Nanoparticles, Small angle X-ray scattering