层状溶致液晶中磁性纳米粒子掺杂的研究

选择非离子表面活性剂十二烷基(4)聚氧乙烯醚(C₁₂E₄)与H₂O构成的溶致液晶(LLC)层状模板, 掺杂油酸铵包覆的Fe₃O₄亲水性磁性纳米粒子, 构建稳定的有机/无机杂合体. 用透射电镜(TEM), X射线粉末衍射(XRD), 偏光显微镜(POM), 小角X射线散射(SAXS)和振动探针式磁强计(VSM)等对粒子及掺杂前后的层状液晶相结构变化进行表征. 结果表明, 粒子掺入使LLC模板的层间距产生了改变, 同时增强了体系有序性．通过对杂合体表征结果的分析, 阐述了模板与粒子间相互作用的机理.

Study on Lamellar Lyotropic Liquid Crystal Doped with Magnetic Nanoparticles

The stable organic/inorganic hybrids have been fabricated within lamellar phase of C12H25- (OCH2CH2)4OH/H2O lyotropic liquid crystals (LLC) by doping hydrophilic ammonium oleate-coated Fe3O4 magnetic nanoparticles. Characterizations of the nanoparticles and the LLC phase structure before and after doping were performed respectively by transmission electron microscope, powder X-ray diffraction, polar- ized optical microscopy, small angle X-ray scattering and vibrating sample magnetometer techniques. Re- sults show that the periodic spacing was influenced and the hybrid order was enhanced after doping nanoparticles. The interactions between the template and nanoparticles have been discussed through analyz- ing the hybrid characterization results.