Birefringence of silica hydrogels prepared under high magnetic fields reinvestigated

Atsushi Mori, Takamasa Kaito, Hidemitsu Furukawa, Masafumi Yamato, Kohki Takahashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

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, Kaito and Furukawa 2008 Mater. Lett. 62 3459-61), we prepared samples in cylindrical cells made of borosilicate glass and obtained a preliminary result indicating a negative birefringence for samples prepared at 5 T with the direction of the magnetic field being the optic axis. We have measured the birefringence of Pb(II)-doped silica hydrogels prepared in square cross-sectional cells made of quartz and overturned the previous conclusion. Interestingly, the magnetic-influenced silica hydrogels measured have been classified into four classes: two positive birefringent ones, a no birefringent one, and a negative birefringent one. Proportionality between birefringence and the strength of magnetic field is seen for the former two.

Original languageEnglish
Article number045202
JournalMaterials Research Express
Volume1
Issue number4
DOIs
Publication statusPublished - 2015 Dec

Keywords

  • Birefringence
  • Hight magnetic field
  • Non-crystalline materials
  • Sol-gel growth

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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