Volume generation towards dynamic surface morphing in liquid crystal polymer networks

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Abstract

Thin coatings based on liquid crystal networks (LCNs) modified with azobenzene moieties are able to create dynamic surface topographies in the micrometre range by exposure with UV light. The surface corrugations can be erased and restored by switching ‘off’ and ‘on’ the UV illumination. Various configurations were presented. The formation of the protrusions was proven to be induced mainly by excessive volume formation when the order in the LCNs is reduced. It is suggested that this extra volume formation can be further enhanced by stimulating the oscillatory dynamics of trans-cis and cis-trans isomerisation. Therefore, dual-wavelength exposure not only exciting the trans state of azobenzene by 365 nm UV light but simultaneously also the cis state by 455 nm blue light was shown to enhance the effect.

Original languageEnglish
Pages (from-to)2136-2143
Number of pages8
JournalLiquid Crystals
Volume43
Issue number13-15
DOIs
Publication statusPublished - 7 Dec 2016

Fingerprint

Liquid Crystals
Azobenzene
Liquid crystal polymers
Ultraviolet radiation
Liquid crystals
liquid crystals
polymers
Surface topography
Isomerization
Lighting
Coatings
Wavelength
isomerization
micrometers
topography
illumination
coatings
configurations
wavelengths
liquid crystal polymer

Keywords

  • azobenzene
  • Dynamic surface topographies
  • liquid crystal networks
  • volume increase

Cite this

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title = "Volume generation towards dynamic surface morphing in liquid crystal polymer networks",
abstract = "Thin coatings based on liquid crystal networks (LCNs) modified with azobenzene moieties are able to create dynamic surface topographies in the micrometre range by exposure with UV light. The surface corrugations can be erased and restored by switching ‘off’ and ‘on’ the UV illumination. Various configurations were presented. The formation of the protrusions was proven to be induced mainly by excessive volume formation when the order in the LCNs is reduced. It is suggested that this extra volume formation can be further enhanced by stimulating the oscillatory dynamics of trans-cis and cis-trans isomerisation. Therefore, dual-wavelength exposure not only exciting the trans state of azobenzene by 365 nm UV light but simultaneously also the cis state by 455 nm blue light was shown to enhance the effect.",
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}

Volume generation towards dynamic surface morphing in liquid crystal polymer networks. / Liu, Danqing.

In: Liquid Crystals, Vol. 43, No. 13-15, 07.12.2016, p. 2136-2143.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Volume generation towards dynamic surface morphing in liquid crystal polymer networks

AU - Liu, Danqing

PY - 2016/12/7

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N2 - Thin coatings based on liquid crystal networks (LCNs) modified with azobenzene moieties are able to create dynamic surface topographies in the micrometre range by exposure with UV light. The surface corrugations can be erased and restored by switching ‘off’ and ‘on’ the UV illumination. Various configurations were presented. The formation of the protrusions was proven to be induced mainly by excessive volume formation when the order in the LCNs is reduced. It is suggested that this extra volume formation can be further enhanced by stimulating the oscillatory dynamics of trans-cis and cis-trans isomerisation. Therefore, dual-wavelength exposure not only exciting the trans state of azobenzene by 365 nm UV light but simultaneously also the cis state by 455 nm blue light was shown to enhance the effect.

AB - Thin coatings based on liquid crystal networks (LCNs) modified with azobenzene moieties are able to create dynamic surface topographies in the micrometre range by exposure with UV light. The surface corrugations can be erased and restored by switching ‘off’ and ‘on’ the UV illumination. Various configurations were presented. The formation of the protrusions was proven to be induced mainly by excessive volume formation when the order in the LCNs is reduced. It is suggested that this extra volume formation can be further enhanced by stimulating the oscillatory dynamics of trans-cis and cis-trans isomerisation. Therefore, dual-wavelength exposure not only exciting the trans state of azobenzene by 365 nm UV light but simultaneously also the cis state by 455 nm blue light was shown to enhance the effect.

KW - azobenzene

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KW - liquid crystal networks

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