Department of Chemistry and Biochemistry and the California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States.
J Am Chem Soc. 2012 Aug 1;134(30):12386-9. doi: 10.1021/ja304860q. Epub 2012 Jul 17.
Herein, features that alter their shape to form a different pattern upon an external trigger are described. Electron-beam lithography was used to fabricate micrometer- and nanometer-sized surface immobilized poly(triethylene glycol methacrylate) (pTEGMA) that exhibits significant thermal responsivity; the resulting hydrogels collapsed by up to 95% of their height upon addition of heat. Multicomponent features composed of both the thermoresponsive polymer and nonresponsive poly(ethylene glycol) (PEG) were then prepared. Upon increase in temperature, only the thermally responsive component of the pattern collapsed, causing a significant and predictable alteration in the overall pattern. Reversible micrometer- and nanometer-sized square-to-triangles, squares-to-checkerboards, smiles-to-neutral face, and zeros-to-ones shapes were shown.
在此，描述了在外力触发下改变形状以形成不同图案的特征。电子束光刻用于制造具有显著热响应性的微米级和纳米级表面固定的聚三乙二醇甲基丙烯酸酯（pTEGMA）; 加入热量后，水凝胶的高度收缩了高达 95%。然后制备了由热响应聚合物和非响应性聚（乙二醇）（PEG）组成的多组分特征。随着温度的升高，只有图案的热响应部分坍塌，导致整体图案发生显著且可预测的变化。展示了可逆的微米级和纳米级正方形到三角形、正方形到棋盘、微笑到中性脸以及零到一的形状。
