Reizabal Ander, Correia Daniela M, Costa Carlos M, Perez-Alvarez Leyre, Vilas-Vilela José L, Lanceros-Méndez S
BCMaterials, Basque Center for Materials, Applications and Nanostructures , UPV/EHU Science Park , 48940 Leioa , Spain.
Macromolecular Chemistry Research Group (LABQUIMAC), Department of Physical Chemistry, Faculty of Science and Technology , University of the Basque Country (UPV/EHU) , 48940 Leioa , Spain.
ACS Appl Mater Interfaces. 2019 Aug 21;11(33):30197-30206. doi: 10.1021/acsami.9b07533. Epub 2019 Aug 6.
This work reports on the development of ionic liquid (IL)/silk fibroin (SF) composite films as electroactive polymers actuators. Different contents (20, 40, and 60% wt) of 1-butyl-3-methylimidazolium tricyanomethanide ([Bmim][C(CN)]) and choline dihydrogen phosphate ([Ch][DHP]) ILs were incorporated into the SF polymer matrix. Due to IL-SF interactions, morphological changes such as globule-like nanostructures are induced in the samples. High concentrations of IL promote SF β-sheet formation above 65%. Further, an increase in the thermal stability of the SF was observed through the incorporation of [Bmim][C(CN)]. IL type and content allow tuning of the electrical response as well as achieving bending actuation. [Bmim][C(CN3)]/SF samples allow bending responses up to 0.5 at an applied voltage of 3 V. In conclusion, this work demonstrates the ability of IL/SF composites to act as electroactive polymer actuators and opens new perspectives in the application of natural resources for smart materials.
本工作报道了离子液体（IL）/丝素蛋白（SF）复合膜作为电活性聚合物致动器的研发情况。将不同含量（20%、40%和60%重量）的1-丁基-3-甲基咪唑三氰甲烷化物（[Bmim][C(CN)]）和磷酸二氢胆碱（[Ch][DHP]）离子液体掺入SF聚合物基体中。由于离子液体与丝素蛋白的相互作用，样品中会诱导出如球状纳米结构等形态变化。高浓度的离子液体促进丝素蛋白β-折叠结构形成，比例超过65%。此外，通过掺入[Bmim][C(CN)]观察到丝素蛋白的热稳定性有所提高。离子液体的类型和含量能够调节电响应并实现弯曲致动。[Bmim][C(CN3)]/SF样品在3 V的施加电压下可实现高达0.5的弯曲响应。总之，本工作证明了离子液体/丝素蛋白复合材料作为电活性聚合物致动器的能力，并为将自然资源应用于智能材料开辟了新的前景。
