journal article·2021-01-20Open access

Reversible Thermochromic Photonic Coatings with a Protective Topcoat

Weixin Zhang, Albert P. H. J. Schenning, Augustinus J. J. Kragt, Guofu Zhou, Laurens T. de Haan

Abstract

The fabrication of reversible and robust thermochromic coatings remains challenging. In this work, a temperature-responsive photonic coating with a protective topcoat is fabricated. A cholesteric oligosiloxane liquid crystal possessing a smectic-to-cholesteric phase-transition temperature response is synthesized. A planar alignment of its cholesteric phase is possible with blade coating. By stabilizing with 3 wt % of a crosslinked liquid crystal network, the photonic coating shows a color change ranging from red to blue upon heating. High transparency is retained, and the structural color changes are fully reversible. A transparent polysiloxane layer can be directly applied on top of the cholesteric layer to protect it against damage without affecting its optical properties. This approach satisfies the basic requirements of thermochromic polymer coatings, as it combines easy processability, coating robustness, and a reversible temperature response.
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Research context

OpenAlex topics: Photonic Crystals and Applications · Liquid Crystal Research Advancements · Photochromic and Fluorescence Chemistry

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

SCNU-TUE Joint Lab of Device Integrated Responsive Materials (DIRM), National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China

Laboratory of Stimuli-responsive Functional Materials & Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, Eindhoven 5600 MB, The Netherlands

ClimAd Technology B.V., Valkenaerhof 68, Nijmegen 6538 TE, The Netherlands

Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Guangdong Provincial Key Laboratory of Optical Information Materials and Technology

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