Photothermally Sensitive Poly(N-isopropylacrylamide)/Graphene Oxide Nanocomposite Hydrogels as Remote Light-Controlled Liquid Microvalves
Photothermally Sensitive Poly(N-isopropylacrylamide)/Graphene Oxide Nanocomposite Hydrogels as Remote Light-Controlled Liquid Microvalves
复制标题
DOI：
10.1002/adfm.201201020
复制
发表时间：
2012-10-10
影响因子：
19
通讯作者：
Yu, Shu-Hong
中科院分区：
文献类型：
--
作者：
Zhu, Chun-Hua;Lu, Yang;Yu, Shu-Hong
在氧化石墨烯（GO）存在下，通过原位γ-辐射辅助聚合N-异丙基丙烯酰胺单体水溶液，可以合成光热敏感的聚（N-异丙基丙烯酰胺）/氧化石墨烯（PNIPAM/GO）纳米复合水凝胶。 PNIPAM/GO 水凝胶的颜色和相变温度随着不同的 GO 掺杂水平而变化。由于GO的高光吸收率，纳米复合水凝胶表现出优异的光热性能，其相变可以通过近红外（NIR）激光照射远程控制，并且通过激光曝光或不曝光是完全可逆的。 GO负载量较高时，纳米复合水凝胶的近红外诱导温度比较低掺杂水平时升高得更快，并且可以通过照射时间有效调节温度。纳米复合水凝胶以其优异的光热性能将在生物医学领域，特别是作为微流控器件具有巨大的应用；我们的实验已经通过远程微阀控制流体流动证明了这一点。这种由β-辐射引发的简单且清洁的合成程序可以扩展到其他纳米复合材料的有效合成。
A photothermally sensitive poly(N-isopropylacrylamide)/graphene oxide (PNIPAM/GO) nanocomposite hydrogel can be synthesized by in situ ?-irradiation-assisted polymerization of an aqueous solution of N-isopropylacrylamide monomer in the presence of graphene oxide (GO). The colors and phase-transition temperatures of the PNIPAM/GO hydrogels change with different GO doping levels. Due to the high optical absorbance of the GO, the nanocomposite hydrogel shows excellent photothermal properties, where its phase transitions can be controlled remotely by near-infrared (NIR) laser irradiation, and it is completely reversible via laser exposure or non-exposure. With a higher GO loading, the NIR-induced temperature of the nanocomposite hydrogel increases more quickly than with a lower doping level and the temperature can be tuned effectively by the irradiation time. The nanocomposite hydrogel with its excellent photothermal properties will have great applications in the biomedical field, especially as microfluidic devices; this has been demonstrated in our experiments by way of remote microvalves to control fluidic flow. Such an easy and clean synthetic procedure initiated by ?-irradiation can be extended for the efficient synthesis of other nanocomposite materials.