Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.
J Mater Chem B. 2019 Mar 14;7(10):1679-1683. doi: 10.1039/c8tb01959b. Epub 2018 Sep 11.
We report a simple and reliable approach to fabricate composite hydrogel sheets with spatially patterned regions of plasmonic gold nanoparticles using a combination of contact printing and diffusion-controlled galvanic replacement reaction. In response to near-infrared laser irradiation, the localized increase in temperature induced the controlled shape deformation of the composite hydrogels, due to the combined effect of photothermal heating of the loaded gold nanoparticles and the thermal responsiveness of the hydrogel matrix. The same hydrogel can be designed to exhibit different modes of shape deformation depending on the direction of light irradiation, which has rarely been reported previously. The composite hydrogels may find applications in biomedicine and soft robots.
我们报告了一种简单可靠的方法，使用接触印刷和扩散控制的置换反应的组合，在具有等离子体金纳米粒子的空间图案区域的复合水凝胶片上制造。在近红外激光照射下，由于负载的金纳米粒子的光热加热和水凝胶基质的热响应的共同作用，局部温度的升高导致了复合水凝胶的受控形状变形。根据光照射的方向，相同的水凝胶可以设计为表现出不同的形状变形模式，这在以前很少有报道。这种复合水凝胶可能在生物医学和软机器人中得到应用。
