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A Facile Approach To Prepare Tough and Responsive Ultrathin Physical Hydrogel Films as Artificial Muscles
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsami.7b10652
Ye Tian 1 , Xiaoshuang Wei 1 , Zhi Jian Wang 1 , Pengju Pan 2 , Fangyuan Li 3 , Daishun Ling 3 , Zi Liang Wu 1 , Qiang Zheng 1
Affiliation  

We report a facile approach to prepare ultrathin physical hydrogel films based on the Marangoni effect, which drives an ethanol solution of poly(stearyl acrylate-co-acrylic acid) (P(SA-co-AAc)) to rapidly spread on the water surface. The subsequent solvent exchange leads to sol–gel transition, where the long alkyl chains of SA units segregate to form physical cross-linking junctions. The resultant disk-shaped single-network (SN) gel films are uniform with tunable thickness (40–80 μm) and diameter (5–12 cm) and possess robust mechanical properties with tensile breaking stress, σb, and breaking strain, εb, being 0.3–1.1 MPa and 30–290%, respectively. The mechanical properties of SN gel films can be further improved by introducing ductile poly(N-isopropylacrylamide) (PNIPAm) into the preformed gel matrix, which forms strong hydrogen bonds with the first network. The obtained physical double-network (DN) hydrogel films are transparent and show excellent mechanical performances with σb of 3–5 MPa and εb of 100–500%. Due to the ultrathin thickness of gel films and response of PNIPAm to saline solutions, the tough DN gel films exhibit fast response (≤60 s) and large stroke force (0.5 MPa) after switching the environment from water bath to saline solution, making them an ideal material to design artificial muscles, soft actuators, and chemomechanical devices.

中文翻译:

一种制备坚韧且反应灵敏的超薄物理水凝胶膜作为人工肌肉的简便方法。

我们报道了一种基于Marangoni效应制备超薄物理水凝胶薄膜的简便方法,该薄膜可驱动聚(硬脂基丙烯酸酯--丙烯酸)(P(SA- co- AAc))的乙醇溶液迅速在水表面扩散。随后的溶剂交换导致溶胶-凝胶转变,其中SA单元的长烷基链分离形成物理交联结。将所得的圆盘状的单网络(SN)凝胶膜是均匀的具有可调谐的厚度(40-80微米)和直径(5-12厘米),并具有与拉伸断裂应力,σ健壮的机械性能b,和断裂应变,ε b,分别为0.3-1.1 MPa和30-290%。通过将可延展的聚(N-异丙基丙烯酰胺)(PNIPAm)引入预制的凝胶基质中,可以进一步改善SN凝胶膜的机械性能,该凝胶基质与第一个网络形成牢固的氢键。所获得的物理双网络(DN)水凝胶膜是透明的并且显示出优异的机械性能与σ b 3-5兆帕和ε b的100-500%。由于凝胶膜的超薄厚度和PNIPAm对盐溶液的响应,在将环境从水浴改为盐溶液后,坚韧的DN凝胶膜显示出快速响应(≤60 s)和较大的冲程力(0.5 MPa)。设计人造肌肉,软致动器和化学机械设备的理想材料。
更新日期:2017-09-20
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