Reversible heat-induced microwrinkling of PEDOT:PSS nanofilm surface over a monodomain liquid crystal elastomer

Francesco Greco; Valentina Domenici; Stefano Romiti; Tareq Assaf; Blaž Zupančič; Jerneja Milavec; Boštjan Zalar; Barbara Mazzolai; Virgilio Mattoli

doi:10.1080/15421406.2012.763208

Reversible heat-induced microwrinkling of PEDOT:PSS nanofilm surface over a monodomain liquid crystal elastomer

Francesco Greco, Valentina Domenici, Stefano Romiti, Tareq Assaf, Blaž Zupančič, Jerneja Milavec, Boštjan Zalar, Barbara Mazzolai, Virgilio Mattoli

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12 Citations (SciVal)

Abstract

New bilayered composite systems with tunable and temperature-dependent formation of periodical wrinkles on the surface are the object of this report. The samples were prepared by spin-coating deposition of a thin film of the conducting polymer poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) on the surface of standard monodomain liquid crystal elastomer (LCE) films. Several bilayered materials were prepared by changing the thickness of PEDOT:PSS nanofilms. Basic characterization showed very good stability and adhesion between the two components also after performing multiple heat cycles around nematic-to-isotropic transition temperature of the LCE. Interestingly, formation of uniaxially aligned microwrinkles was observed, with most of the wrinkles aligned along perpendicular direction with respect to the nematic director, due to reversible elongation/compression of the LCE during thermal cycles.

Original language	English
Pages (from-to)	40-49
Number of pages	10
Journal	Molecular Crystals and Liquid Crystals
Volume	572
Issue number	1
DOIs	https://doi.org/10.1080/15421406.2012.763208
Publication status	E-pub ahead of print - 2 Apr 2013

Bibliographical note

Funding Information:
The authors are grateful to COST (European Cooperation in Science and Technology) in the framework of ESNAM (European Scientific Network for Artificial Muscles) – COST Action MP1003. JM thanks the COST ACTION MP1003 for the short-term scientific mission STSM-MP1003–9391. VD thanks the Centre of Excellence NAMASTE (Ljubljana, Slovenia) for the financial support as visiting professor in 2011.

Funding

The authors are grateful to COST (European Cooperation in Science and Technology) in the framework of ESNAM (European Scientific Network for Artificial Muscles) – COST Action MP1003. JM thanks the COST ACTION MP1003 for the short-term scientific mission STSM-MP1003–9391. VD thanks the Centre of Excellence NAMASTE (Ljubljana, Slovenia) for the financial support as visiting professor in 2011.

Keywords

Actuation
bending
composite
conductive polymer
Joule heating
liquid crystal elastomer
PEDOT:PSS
soft actuation
surface
wrinkling

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1080/15421406.2012.763208

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title = "Reversible heat-induced microwrinkling of PEDOT:PSS nanofilm surface over a monodomain liquid crystal elastomer",

abstract = "New bilayered composite systems with tunable and temperature-dependent formation of periodical wrinkles on the surface are the object of this report. The samples were prepared by spin-coating deposition of a thin film of the conducting polymer poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) on the surface of standard monodomain liquid crystal elastomer (LCE) films. Several bilayered materials were prepared by changing the thickness of PEDOT:PSS nanofilms. Basic characterization showed very good stability and adhesion between the two components also after performing multiple heat cycles around nematic-to-isotropic transition temperature of the LCE. Interestingly, formation of uniaxially aligned microwrinkles was observed, with most of the wrinkles aligned along perpendicular direction with respect to the nematic director, due to reversible elongation/compression of the LCE during thermal cycles.",

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note = "Funding Information: The authors are grateful to COST (European Cooperation in Science and Technology) in the framework of ESNAM (European Scientific Network for Artificial Muscles) – COST Action MP1003. JM thanks the COST ACTION MP1003 for the short-term scientific mission STSM-MP1003–9391. VD thanks the Centre of Excellence NAMASTE (Ljubljana, Slovenia) for the financial support as visiting professor in 2011.",

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AU - Greco, Francesco

AU - Domenici, Valentina

AU - Romiti, Stefano

AU - Assaf, Tareq

AU - Zupančič, Blaž

AU - Milavec, Jerneja

AU - Zalar, Boštjan

AU - Mazzolai, Barbara

AU - Mattoli, Virgilio

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N2 - New bilayered composite systems with tunable and temperature-dependent formation of periodical wrinkles on the surface are the object of this report. The samples were prepared by spin-coating deposition of a thin film of the conducting polymer poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) on the surface of standard monodomain liquid crystal elastomer (LCE) films. Several bilayered materials were prepared by changing the thickness of PEDOT:PSS nanofilms. Basic characterization showed very good stability and adhesion between the two components also after performing multiple heat cycles around nematic-to-isotropic transition temperature of the LCE. Interestingly, formation of uniaxially aligned microwrinkles was observed, with most of the wrinkles aligned along perpendicular direction with respect to the nematic director, due to reversible elongation/compression of the LCE during thermal cycles.

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Reversible heat-induced microwrinkling of PEDOT:PSS nanofilm surface over a monodomain liquid crystal elastomer

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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