Chungyampin Supanit, Niamlang Sumonman
Department of Materials and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT) Klong 6, Thanyaburi, Pathum Thani 12120, Thailand.
Materials (Basel). 2021 Dec 9;14(24):7553. doi: 10.3390/ma14247553.
The high actuation response of soft gel from a graphene oxide/gelatin composite was prepared as an alternative material in soft robotics applications. Graphene oxide (GO) was selected as the electroresponsive (ER) particle. GO was synthesized by modifying Hummer's method at various ratios of graphite (GP) to potassium permanganate (KMnO). To study the effect of ER particles on electromechanical properties, GO was blended with gelatin hydrogel (GEL) at various concentrations. The electrical properties of the ER particles (GO and GP) and matrix (GEL) were measured. The capacitance (C), resistance (R), and dielectric constant of the GO/GEL composite were lower than those of the GO particles but higher than those of the GEL and GP/GEL composite at the given number of particles. The effects of external electric field strength and the distance between electrodes on the degree of bending and the dielectrophoresis force (F) were investigated. When the external electric field was applied, the composite bent toward electrode, because the electric field polarized the functional group of polymer molecules. Under applied 400 V/mm, the GO/GEL composite (5% /) showed the highest deflection angle (θ = 82.88°) and dielectrophoresis force (7.36 N). From the results, we conclude that the GO/GEL composite can be an alternative candidate material for electromechanical actuator applications.
制备了一种氧化石墨烯/明胶复合材料软凝胶的高驱动响应材料，作为软机器人应用中的替代材料。选择氧化石墨烯（GO）作为电响应（ER）颗粒。通过在不同比例的石墨（GP）与高锰酸钾（KMnO）下改进Hummer法合成GO。为了研究ER颗粒对机电性能的影响，将GO与不同浓度的明胶水凝胶（GEL）混合。测量了ER颗粒（GO和GP）和基体（GEL）的电学性能。在给定颗粒数下，GO/GEL复合材料的电容（C）、电阻（R）和介电常数低于GO颗粒，但高于GEL和GP/GEL复合材料。研究了外部电场强度和电极间距对弯曲程度和介电泳力（F）的影响。施加外部电场时，复合材料向电极弯曲，因为电场使聚合物分子的官能团极化。在施加400V/mm时，GO/GEL复合材料（5%/）显示出最高的偏转角（θ=82.88°）和介电泳力（7.36N）。从结果来看，我们得出结论，GO/GEL复合材料可作为机电致动器应用的替代候选材料。
