Thermally Functional Liquid Crystal Networks by Magnetic Field Driven Molecular Orientation

Jungwoo Shin, Minjee Kang, Tsunghan Tsai, Cecilia Das Neves Barbosa Leal Lauten, Paul V Braun, David G Cahill

Research output: Contribution to journalArticle

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

Fingerprint

Liquid Crystals
Molecular orientation
Liquid crystals
Magnetic fields
Thermal conductivity
Thermal conductivity of liquids
Photopolymerization
X ray scattering
Monomers
Viscosity
Substrates

ASJC Scopus subject areas

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

Cite this

Thermally Functional Liquid Crystal Networks by Magnetic Field Driven Molecular Orientation. / Shin, Jungwoo; Kang, Minjee; Tsai, Tsunghan; Das Neves Barbosa Leal Lauten, Cecilia; Braun, Paul V; Cahill, David G.

In: ACS Macro Letters, Vol. 5, No. 8, 16.08.2016, p. 955-960.

Research output: Contribution to journalArticle

@article{a6fff3ea26394277ad78312393901e53,
title = "Thermally Functional Liquid Crystal Networks by Magnetic Field Driven Molecular Orientation",
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.",
author = "Jungwoo Shin and Minjee Kang and Tsunghan Tsai and {Das Neves Barbosa Leal Lauten}, Cecilia and Braun, {Paul V} and Cahill, {David G}",
year = "2016",
month = "8",
day = "16",
doi = "10.1021/acsmacrolett.6b00475",
language = "English (US)",
volume = "5",
pages = "955--960",
journal = "ACS Macro Letters",
issn = "2161-1653",
publisher = "American Chemical Society",
number = "8",

}

TY - JOUR

T1 - Thermally Functional Liquid Crystal Networks by Magnetic Field Driven Molecular Orientation

AU - Shin, Jungwoo

AU - Kang, Minjee

AU - Tsai, Tsunghan

AU - Das Neves Barbosa Leal Lauten, Cecilia

AU - Braun, Paul V

AU - Cahill, David G

PY - 2016/8/16

Y1 - 2016/8/16

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84982311174&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84982311174&partnerID=8YFLogxK

U2 - 10.1021/acsmacrolett.6b00475

DO - 10.1021/acsmacrolett.6b00475

M3 - Article

AN - SCOPUS:84982311174

VL - 5

SP - 955

EP - 960

JO - ACS Macro Letters

JF - ACS Macro Letters

SN - 2161-1653

IS - 8

ER -