Optical anisotropy of carbon nano-fiber/silica composite films prepared under high magnetic field

Naoyuki Kitamura, Kohei Fukumi, Kohki Takahashi, Iwao Mogi, Satoshi Awaji, Kazuo Watanabe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Carbon/silica composite films were prepared from colloidal silica aqueous solution in which vapour grown carbon nano-fibers were dispersed. The orientation of nano-fibers was attempted by dip-coating substrates under high magnetic field up to 10T. The fibers started to align along the direction of magnetic field below 1T. The degree of orientation was saturated at about 6T. The anisotropic susceptibility, δχ = χ// - χ, was estimated to be (3.05 ± 1.10) × 10 -7cm3/mol from the fitting of numerical simulation. Optical anisotropy, the ratio between transmittances of light polarized perpendicular to and parallel to the direction of fiber orientation, increased immediately in the films prepared under applied fields below 1T and almost saturated above 1T. The optical anisotropy was in good agreement with the behaviour of magnetic orientation of fibers.

Original languageEnglish
Pages (from-to)430-433
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume119
Issue number1390
DOIs
Publication statusPublished - 2011 Jun

Keywords

  • Carbon nano-fiber
  • Composite film
  • Dip-coating
  • Magnetic orientation
  • Silica

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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