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An Optical Actuator Based on Gold‐Nanoparticle‐Containing Temperature‐Memory Semicrystalline Polymers
Author(s) -
Ge Feijie,
Lu Xili,
Xiang Jun,
Tong Xia,
Zhao Yue
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201612164
Subject(s) - materials science , crystallinity , colloidal gold , polymer , crystallite , nanoparticle , ethylene vinyl acetate , chemical engineering , polymer chemistry , composite material , nanotechnology , photochemistry , optoelectronics , chemistry , copolymer , metallurgy , engineering
Abstract Photoresponsive actuators based on semicrystalline poly(ethylene‐co‐vinyl acetate) (EVA) loaded with small amounts of gold nanoparticles (AuNPs) are described. Upon absorption of light (532 nm), the heat released by the AuNPs raises the temperature in the irradiated region to T light to melt crystallites with lower melting temperatures (T m T light . Once the light is turned off, the recrystallization of oriented chains in the actuation domains upon cooling gives rise to an expansion force. We show that the photoinduced contraction force, T light , and the speed for reaching T light can readily be adjusted, which makes EVA/AuNP a robust, fast optical actuation system tunable in both speed and magnitude. The material design can easily be extended to other temperature‐memory semicrystalline polymers in combination with various light‐absorbing and heat‐generating additives.