磁场作用下硅水凝胶的结构各向异性
Structural anisotropy of silica hydrogels prepared under magnetic field
摘要：
对在不同磁场下制备的Pb掺杂SiO2水凝胶进行了生物电性能测试。在5 T下制备的硅胶用作PbBr 2晶体生长的介质，其结果暗示了结构各向异性;通过透射电子显微镜获得了取向的微晶阵列。虽然在0、1和3 T下制备的样品没有双折射，但我们发现样品具有10^-6数量级的负双折射，就好像磁场的方向是单轴晶体的光轴。据作者所知，双折射二氧化硅水凝胶是首次在磁场凝胶化。此外，扫描显微光散射实验已经进行。结果表明，双折射样品的特征长度分布比非双折射样品的特征长度分布窄。
英文摘要：
Birefringence measurements have been carried out on the Pb-doped silica hydrogels prepared under various magnetic fields up to 5T. The silica gels prepared at 5T were used as a medium of crystal growth of PbBr2, whose result implied the structural anisotropy; an aligned array of crystallites was obtained by transmission electron microscopy. While the samples prepared at 0, 1, and 3T have no birefringence, we found that the samples have negative birefringence on the order of magnitude 10^-6 as if the direction of the magnetic field is the optic axis of a uniaxal crystal. To the authors' knowledge, the birefringent silica hydrogels were obtained by gelation under magnetic field for the first time. Also, scanning microscopic light scattering experiments have been performed. The results indicate that the characteristic length distribution for birefringent samples is narrower than that for non-birefringent ones.
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