New approach toward reflective films and fibers using cholesteric liquid-crystal coatings

Olivier T. Picot (Corresponding author), Mian Dai, Dirk J. Broer, Ton Peijs, Cees W.M. Bastiaansen

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

A new approach for the production of oriented films and fibers with angular-dependent reflective colors is presented. The process consists of spray coating a solution of cholesteric liquid-crystalline monomers onto a melt-processed and oriented polyamide-6 substrate followed by UV curing. Reflectivity measurements and optical microscopy show that a well-defined liquid-crystalline and planar alignment is obtained. It is further demonstrated that a reflection up to 80% is obtained by coating oriented films on both sides of the oriented substrate with a single-handedness cholesteric liquid-crystal coating. The high reflectivity is attributed to the close to half-wave retardation induced by the anisotropic polymer substrate. Also, polyamide-6 filaments are successfully coated and fibers are obtained with an angular-dependent color in a single dimension along the fiber direction, which originates from the planar cholesteric alignment on a curved surface.

LanguageEnglish
Pages7117-7121
Number of pages5
JournalACS Applied Materials & Interfaces
Volume5
Issue number15
DOIs
StatePublished - 14 Aug 2013

Fingerprint

Cholesteric liquid crystals
Polyamides
Coatings
Fibers
Substrates
Crystalline materials
Color
Liquids
Optical microscopy
Curing
Polymers
Monomers
nylon 6

Keywords

  • cholesteric liquid crystal
  • coloration
  • cross-linked network
  • fibers
  • functional coating
  • self-organizing

Cite this

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title = "New approach toward reflective films and fibers using cholesteric liquid-crystal coatings",
abstract = "A new approach for the production of oriented films and fibers with angular-dependent reflective colors is presented. The process consists of spray coating a solution of cholesteric liquid-crystalline monomers onto a melt-processed and oriented polyamide-6 substrate followed by UV curing. Reflectivity measurements and optical microscopy show that a well-defined liquid-crystalline and planar alignment is obtained. It is further demonstrated that a reflection up to 80{\%} is obtained by coating oriented films on both sides of the oriented substrate with a single-handedness cholesteric liquid-crystal coating. The high reflectivity is attributed to the close to half-wave retardation induced by the anisotropic polymer substrate. Also, polyamide-6 filaments are successfully coated and fibers are obtained with an angular-dependent color in a single dimension along the fiber direction, which originates from the planar cholesteric alignment on a curved surface.",
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New approach toward reflective films and fibers using cholesteric liquid-crystal coatings. / Picot, Olivier T. (Corresponding author); Dai, Mian; Broer, Dirk J.; Peijs, Ton; Bastiaansen, Cees W.M.

In: ACS Applied Materials & Interfaces, Vol. 5, No. 15, 14.08.2013, p. 7117-7121.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - New approach toward reflective films and fibers using cholesteric liquid-crystal coatings

AU - Picot,Olivier T.

AU - Dai,Mian

AU - Broer,Dirk J.

AU - Peijs,Ton

AU - Bastiaansen,Cees W.M.

PY - 2013/8/14

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N2 - A new approach for the production of oriented films and fibers with angular-dependent reflective colors is presented. The process consists of spray coating a solution of cholesteric liquid-crystalline monomers onto a melt-processed and oriented polyamide-6 substrate followed by UV curing. Reflectivity measurements and optical microscopy show that a well-defined liquid-crystalline and planar alignment is obtained. It is further demonstrated that a reflection up to 80% is obtained by coating oriented films on both sides of the oriented substrate with a single-handedness cholesteric liquid-crystal coating. The high reflectivity is attributed to the close to half-wave retardation induced by the anisotropic polymer substrate. Also, polyamide-6 filaments are successfully coated and fibers are obtained with an angular-dependent color in a single dimension along the fiber direction, which originates from the planar cholesteric alignment on a curved surface.

AB - A new approach for the production of oriented films and fibers with angular-dependent reflective colors is presented. The process consists of spray coating a solution of cholesteric liquid-crystalline monomers onto a melt-processed and oriented polyamide-6 substrate followed by UV curing. Reflectivity measurements and optical microscopy show that a well-defined liquid-crystalline and planar alignment is obtained. It is further demonstrated that a reflection up to 80% is obtained by coating oriented films on both sides of the oriented substrate with a single-handedness cholesteric liquid-crystal coating. The high reflectivity is attributed to the close to half-wave retardation induced by the anisotropic polymer substrate. Also, polyamide-6 filaments are successfully coated and fibers are obtained with an angular-dependent color in a single dimension along the fiber direction, which originates from the planar cholesteric alignment on a curved surface.

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KW - coloration

KW - cross-linked network

KW - fibers

KW - functional coating

KW - self-organizing

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