Thermally Functional Liquid Crystal Networks by Magnetic Field Driven Molecular Orientation

Jungwoo Shin, Minjee Kang, Tsunghan Tsai, Cecilia Leal, Paul V. Braun, David G. Cahill

Research output: Contribution to journalArticlepeer-review

Abstract

Aligned liquid crystal networks were synthesized by photopolymerization of liquid crystal monomers in the presence of magnetic fields. Grazing incident wide-angle X-ray scattering was used to characterize the degree of molecular alignment of mesogen chains and time-domain thermoreflectance was used to measure thermal conductivity. Liquid crystal networks with mesogenic units aligned perpendicular and parallel to the substrate exhibit thermal conductivity of 0.34 W m-1 K-1 and 0.22 W m-1 K-1, respectively. The thermal conductivity and orientational order of liquid crystal networks vary as a function of temperature. The thermal conductivity of liquid crystal networks can be manipulated by a magnetic field at above the glass transition temperature (65 °C) where the reduced viscosity enables molecular reorientation on the time scale of 10 min.

Original languageEnglish (US)
Pages (from-to)955-960
Number of pages6
JournalACS Macro Letters
Volume5
Issue number8
DOIs
StatePublished - Aug 16 2016

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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