Uniform Contraction and High Force Output of Photoresponsive Shape‐Memory Polymer Actuators with Large Thickness Based on Vertical Distribution of Rare Earth Oxides

Abstract

Front Cover: In article number 2100683 by Liang Fang, Chunhua Lu, and co-workers, three rare-earth oxides with selective photothermal effects toward different near-infrared light beams are assembled vertically in thick shape-memory polymer films. Simultaneous irradiation of three near-infrared light beams achieves a low temperature gradient along the film thickness. Uniform contraction, instead of folding or bending, is realized and high force output is generated.