Programmable Volume Phase Transition of Hydrogels Achieved by Large Thermal Hysteresis for Static-Motion Bilayer Actuators

详细信息    查看全文

• 作者：Dowan Kim ; Haneul Kim ; Eunsu Lee ; Kyeong Sik Jin ; Jinhwan Yoon
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：28
• 期：23
• 页码：8807-8814
• 全文大小：479K
• ISSN：1520-5002

文摘

In order to achieve a hydrogel capable of programmable volume change, poly(N-isopropylacrylamide)-graft-methylcellulose hydrogel (PNIPAm-g-MC) was prepared through the grafting of PNIPAm onto a MC backbone and simultaneous cross-linking of the chains. PNIPAm-g-MC exhibited large thermal hysteresis in its volume change, which results from the stable hydrophobic junctions between the MC strands formed during heating. By combining photothermal magnetite nanoparticles as a heat transducer with the prepared hydrogel, programmable volume phase transition between the shrunken and swollen state could be triggered by visible light irradiation and excessive cooling, respectively. Based on this programmable feature, a bilayer actuator capable of static bending was fabricated. The developed programmable hydrogels are expected to provide a platform for the next generation of origami, microvalves, and drug delivery systems.