Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers

Laurens T. de Haan, Timo J.J. Willigers, Levina E.A. Wijkhuijs, Matthew Hendrikx, Cuong Thai Nguyen, Philippe Leclère, Anne E.J. Souren, Guofu Zhou, Michael G. Debije

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Wrinkling is a powerful technique for the preparation of surface structures over large areas, but it is difficult to simultaneously control the direction, period, and amplitude of the wrinkles without resorting to complicated procedures. In this work, we demonstrate a wrinkling system consisting of a liquid crystal polymer network and a thin layer of gold, in which the direction of the wrinkles is controlled by the alignment of the liquid crystal molecules and the average amplitude and period are controlled by a high-intensity UV irradiation. The UV exposure represses the amplitude and period dictated by the total exposure. Using photoalignment and photomasks, we demonstrate an unprecedented control over the wrinkling parameters and were able to generate some striking optical patterns. The mechanism of the wrinkle suppression was investigated and appears to involve localized photodegradation at the polymer-gold interface, possibly due to the formation of mechanoradicals.

LanguageEnglish
Pages10543-10549
Number of pages7
JournalLangmuir
Volume34
Issue number36
DOIs
StatePublished - 8 Aug 2018

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wrinkling
Liquid crystal polymers
buckling
Gold
Buckling
liquid crystals
gold
Liquid Crystals
Photomasks
Photodegradation
polymers
Surface structure
Liquid crystals
Polymers
photomasks
Irradiation
Molecules
alignment
retarding
preparation

Cite this

de Haan, Laurens T. ; Willigers, Timo J.J. ; Wijkhuijs, Levina E.A. ; Hendrikx, Matthew ; Nguyen, Cuong Thai ; Leclère, Philippe ; Souren, Anne E.J. ; Zhou, Guofu ; Debije, Michael G./ Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers. In: Langmuir. 2018 ; Vol. 34, No. 36. pp. 10543-10549
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abstract = "Wrinkling is a powerful technique for the preparation of surface structures over large areas, but it is difficult to simultaneously control the direction, period, and amplitude of the wrinkles without resorting to complicated procedures. In this work, we demonstrate a wrinkling system consisting of a liquid crystal polymer network and a thin layer of gold, in which the direction of the wrinkles is controlled by the alignment of the liquid crystal molecules and the average amplitude and period are controlled by a high-intensity UV irradiation. The UV exposure represses the amplitude and period dictated by the total exposure. Using photoalignment and photomasks, we demonstrate an unprecedented control over the wrinkling parameters and were able to generate some striking optical patterns. The mechanism of the wrinkle suppression was investigated and appears to involve localized photodegradation at the polymer-gold interface, possibly due to the formation of mechanoradicals.",
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de Haan, LT, Willigers, TJJ, Wijkhuijs, LEA, Hendrikx, M, Nguyen, CT, Leclère, P, Souren, AEJ, Zhou, G & Debije, MG 2018, 'Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers' Langmuir, vol. 34, no. 36, pp. 10543-10549. DOI: 10.1021/acs.langmuir.8b01934

Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers. / de Haan, Laurens T.; Willigers, Timo J.J.; Wijkhuijs, Levina E.A.; Hendrikx, Matthew; Nguyen, Cuong Thai; Leclère, Philippe; Souren, Anne E.J.; Zhou, Guofu; Debije, Michael G.

In: Langmuir, Vol. 34, No. 36, 08.08.2018, p. 10543-10549.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Willigers,Timo J.J.

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AU - Nguyen,Cuong Thai

AU - Leclère,Philippe

AU - Souren,Anne E.J.

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AU - Debije,Michael G.

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AB - Wrinkling is a powerful technique for the preparation of surface structures over large areas, but it is difficult to simultaneously control the direction, period, and amplitude of the wrinkles without resorting to complicated procedures. In this work, we demonstrate a wrinkling system consisting of a liquid crystal polymer network and a thin layer of gold, in which the direction of the wrinkles is controlled by the alignment of the liquid crystal molecules and the average amplitude and period are controlled by a high-intensity UV irradiation. The UV exposure represses the amplitude and period dictated by the total exposure. Using photoalignment and photomasks, we demonstrate an unprecedented control over the wrinkling parameters and were able to generate some striking optical patterns. The mechanism of the wrinkle suppression was investigated and appears to involve localized photodegradation at the polymer-gold interface, possibly due to the formation of mechanoradicals.

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de Haan LT, Willigers TJJ, Wijkhuijs LEA, Hendrikx M, Nguyen CT, Leclère P et al. Contactless control of local surface buckling in photoaligned gold/liquid crystal polymer bilayers. Langmuir. 2018 Aug 8;34(36):10543-10549. Available from, DOI: 10.1021/acs.langmuir.8b01934