高磁场下制备的SiO2水凝胶的生物相容性研究
Birefringence of silica hydrogels prepared under high magnetic fields reinvestigated
摘要：
双折射率是材料结构各向异性的指标。我们测量了在不同强度的高磁场下制备的Pb（II）掺杂的二氧化硅水凝胶的双折射。因为二氧化硅是抗磁性的，所以不期望由磁场引起的结构各向异性。在以前的工作中[Mori A，Kaito T，Furukawa H 2008 Mater. Lett. 62 3459-3461]，我们在由硼硅酸盐玻璃制成的圆柱形单元中制备样品，并获得了初步结果，表明在磁场方向为光轴的情况下在5 T下制备的样品的负双折射。我们已经测量了双折射的Pn（II）掺杂的二氧化硅水凝胶制备在正方形横截面的石英制成的细胞，并恢复了以前的结论。有趣的是，磁影响的硅水凝胶被分为四类：两个正双折射的，没有双折射的，和负双折射的。对于前两者，双折射与磁场的强度成正比。
英文摘要：
Birefringence is an indicator of structural anisotropy of materials. We measured the birefringence of Pb(II)-doped silica hydrogels prepared under a high magnetic field of various strengths. Because the silica is diamagnetic, one does not expect the structural anisotropy induced by a magnetic field. In previous work [Mori A, Kaito T, Furukawa H 2008 Mater. Lett. 62 3459-3461], we prepared samples in cylindrical cells made of borosilicate glass and obtained a preliminary result indicating a negative birefringence for samples prepared at 5T with the direction of the magnetic field being the optic axis. We have measured the birefringence of Pn(II)-doped silica hydrogels prepared in square cross-sectional cells made of quartz and reverted the previous conclusion. Interestingly, the magnetic-influenced silica hydrogels measured have been classified into four classes: two positive birefringent ones, no birefringent one, and negative birefringent one. Proportionality between birefringence and the strength of magnetic field is seen for the former two.
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