Jiang Wenqing, Yu Bo, Liu Weimin, Hao Jingcheng
Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
Langmuir. 2007 Jul 31;23(16):8549-53. doi: 10.1021/la700921w. Epub 2007 Jul 4.
Multiwalled carbon nanotubes (MWCNTs) were evenly dispersed within hexagonal lyotropic liquid crystals (LLCs) formed in room-temperature ionic liquids (RTILs), ethylammonium nitrate (EAN). Characterization and tribological properties of dispersed system were studied in detail. Polarized optical microscopy images combined with small-angle X-ray scattering (SAXS) results indicate that the MWCNTs are well-dispersed and that the introduction of MWCNTs does not destroy the structure of hexagonal LLCs. The increase of d spacing demonstrates the integration of MWCNTs within the cylinders of the hexagonal LLCs. FT-IR and Raman spectra of the MWCNTs-LLC composites show the characteristic absorption peaks and Raman bands of MWCNTs. The tribological properties were explored to greatly extend the applications of MWCNTs-LLC composites in RTILs as lubricating materials. The rheological measurement results indicate that MWCNTs-LLC composites are highly viscoelastic and that the apparent viscosity is enhanced by the presence of the MWCNTs.
多壁碳纳米管(MWCNTs)均匀分散在室温离子液体(RTILs)硝酸乙铵(EAN)中形成的六方溶致液晶(LLCs)内。详细研究了分散体系的表征和摩擦学性能。偏光显微镜图像与小角X射线散射(SAXS)结果表明,MWCNTs分散良好,且MWCNTs的引入并未破坏六方LLCs的结构。d间距的增加表明MWCNTs整合到了六方LLCs的圆柱体内。MWCNTs-LLC复合材料的傅里叶变换红外光谱(FT-IR)和拉曼光谱显示了MWCNTs的特征吸收峰和拉曼谱带。对摩擦学性能进行了探索,以极大地扩展MWCNTs-LLC复合材料在RTILs中作为润滑材料的应用。流变学测量结果表明,MWCNTs-LLC复合材料具有高粘弹性,且MWCNTs的存在提高了表观粘度。