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首页> 外文期刊>Smart Materials & Structures >Hybrid nanocomposites based on electroactive hydrogels and cellulose nanocrystals for high-sensitivity electro-mechanical underwater actuation
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Hybrid nanocomposites based on electroactive hydrogels and cellulose nanocrystals for high-sensitivity electro-mechanical underwater actuation

机译：基于电活性水凝胶和纤维素纳米晶体的杂化纳米复合材料，用于高灵敏度电力水下致动

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摘要

We report the synthesis, fabrication and characterization of a hybrid hydrogel/cellulose nanocomposite, which exhibits high-performance electro-mechanical underwater actuation and high sensitivity in response to electrical stimuli below the standard potential of water electrolysis. The macromolecular structure of the material is constituted by an electroactive hydrogel, obtained through a photo-polymerization reaction with the use of three vinylic comonomers: Na-4-vinylbenzenesulfonate, 2-hydroxyethylmethacrylate, and acrylonitrile. Different amounts (from 0.1% to 1.4% w/w) of biodegradable cellulose nanocrystals (CNCs) with sulfonate surface groups, obtained through the acidic hydrolysis of sulphite pulp lapsheets, are physically incorporated into the gel matrix during the synthesis step. Freestanding thin films of the nanocomposites are molded, and their swelling, mechanical and responsive properties are fully characterized. We observed that the embedding of the CNCs enhanced both the material Young's modulus and its sensitivity to the applied electric field in the sub-volt regime (down to 5mV cm(-1)). A demonstrator integrating multiple actuators that cooperatively bend together, mimicking the motion of an electro-valve, is also prototyped and tested. The presented nanocomposite is suitable for the development of soft smart components for bio-robotic applications and cells-based and bio-hybrid fluidic devices fabrication.
机译：我们报道了杂交水凝胶/纤维素纳米复合材料的合成，制造和表征，其响应于低于水电解的标准电位的电刺激而具有高性能电力水下致动和高灵敏度。该材料的大分子结构由电凝胶构成，通过使用三种乙烯基共聚单体的光聚合反应获得：Na-4-乙烯基苯磺酸盐，2-羟乙基甲基丙烯酸盐和丙烯腈。通过亚硫酸盐浆圈酸的酸性水解获得的可生物降解的纤维素纳米晶体（CNC）与磺酸盐水解的不同量（从0.1％至1.4％w / w），在合成步骤期间物理地掺入凝胶基质中。模塑纳米复合材料的独立薄膜，其溶胀，机械和响应性充分表征。我们观察到CNCS的嵌入增强了材料杨氏模量及其对亚伏制度中施加的电场的敏感性（下至5mV cm（-1））。整合多个致动器的示威者，这些致动器一起弯曲在一起，模仿电阀的运动，也是原型的和测试的。本发明的纳米复合材料适用于生物机器人应用和基于细胞和生物混合流体装置的软智能部件的开发。

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