Reversible generation of large retractive tensile forces in isometric chemo-mechanical actuators composed of nanocomposite hydrogels and aqueous NaCl solutions†,Soft Matter

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Reversible generation of large retractive tensile forces in isometric chemo-mechanical actuators composed of nanocomposite hydrogels and aqueous NaCl solutions†
Soft Matter ( IF 2.9 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7sm01935a
Kazutoshi Haraguchi _{1,

2,

3,

4,

5} , Yuji Kimura _{1,

2,

3,

4,

5} , Shouichi Shimizu _{1,

2,

3,

4,

5}

Affiliation

This article addresses the generation of large mechanical forces in muscle-like isometric actuator systems composed of stimuli-responsive nanocomposite hydrogels (NC gels) and aqueous NaCl solutions. NC gels with poly(N-isopropylacrylamide)–clay (PNIPA–clay) network structures exhibit high mechanical toughnesses and reversible swelling/deswelling behavior in the absence/presence of NaCl. NC gels constrained to constant lengths in brine generate enhanced contractive forces due to the salt-induced coil-to-globule transitions that are more than ten times larger than those induced thermally. A retractive tensile force (4 N/170 kPa), comparable to that of human muscle, was repeatedly generated at 20 °C using an appropriately composed NC gel (clay: 2 mol%, PNIPA: 2 M), and by alternating the NaCl concentration between 0 and 5 M. This phenomenon is attributed to the combined effects of enhanced deswelling behavior resulting from the salt-induced coil-to-globule transition of PNIPA and the high stiffness of the deswollen gel due to the NaCl-strengthened PNIPA–clay network.

中文翻译：

在由纳米复合水凝胶和NaCl水溶液组成的等距化学机械执行器中可逆地产生大的回缩张力†

本文讨论了由刺激响应性纳米复合水凝胶（NC凝胶）和NaCl水溶液组成的类似肌肉的等距执行器系统中的大型机械力的产生。聚N的NC凝胶-异丙基丙烯酰胺）-粘土（PNIPA-粘土）网络结构在没有NaCl或存在NaCl的情况下显示出较高的机械韧性和可逆的溶胀/溶胀行为。在盐水中固定长度不变的NC凝胶会产生增强的收缩力，这是由于盐诱导的线圈到小球的转变比热诱导的转变大十倍以上。使用适当组成的NC凝胶（粘土：2 mol％，PNIPA：2 M）并通过交替使用NaCl，在20°C下反复产生与人的肌肉相当的回缩张力（4 N / 170 kPa）浓度介于0到5 M之间。

更新日期：2018-01-02

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