Reverse adhesion of a gecko-inspired synthetic adhesive switched by an ion-exchange polymer-metal composite actuator.
Reverse adhesion of a gecko-inspired synthetic adhesive switched by an ion-exchange polymer-metal composite actuator.
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由离子交换聚合物-金属复合致动器切换的受壁虎启发的合成粘合剂的反向粘附
DOI：
10.1021/am509163m
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发表时间：
2015-03-11
影响因子：
9.5
通讯作者：
Tan W
中科院分区：
文献类型：
--
作者：
Guo DJ;Liu R;Cheng Y;Zhang H;Zhou LM;Fang SM;Elliott WH;Tan W
受壁虎如何外展，旋转和内收其刚毛脚趾以粘附到不同表面的启发，我们开发了一种名为离子交换聚合物-金属复合材料（IPMC）的人工肌肉材料，作为合成粘合剂，它能够改变其粘附性能。合成粘合剂由Si模板通过聚（甲基乙烯基硅氧烷）（PMVS）的粘性胶体前体浇铸而成。刚毛微柱的PMVS阵列具有高密度的柱（3.8 × 103个柱/mm 2），平均直径为3 μm，孔厚度为10 μm。制备了含有直径为5-30 nm的Ag球状纳米颗粒（GO/Ag NPs）的氧化石墨烯单层膜，并将其掺杂到离子交换Nafion膜中，以改善其载流子传输、节水和离子交换能力，从而增强IPMC的机电响应。在附着到PMVS微柱之后，通过1.0、1.5或2.0 V的方波输入来驱动IPMC以来回弯曲，从而驱动微柱主动地夹持或释放表面。为了确定微柱的粘附性，当IPMC分别驱动刚毛微柱夹持和释放时，测量法向吸附力和解吸力。附着力的结果表明，正常的吸附力是5.54-，14.20-，和23.13倍高于正常的解吸力下1.0，1.5，或2.0 V，分别。此外，剪切粘附力或摩擦力分别增加了98%、219%和245%。我们的新技术为可逆壁虎启发的合成粘合剂提供了先进的设计策略，这些粘合剂可能用于具有前所未有的性能的蜘蛛侠式爬墙设备。
Inspired by how geckos abduct, rotate, and adduct their setal foot toes to adhere to different surfaces, we have developed an artificial muscle material called ion-exchange polymer–metal composite (IPMC), which, as a synthetic adhesive, is capable of changing its adhesion properties. The synthetic adhesive was cast from a Si template through a sticky colloid precursor of poly(methylvinylsiloxane) (PMVS). The PMVS array of setal micropillars had a high density of pillars (3.8 × 103 pillars/mm2) with a mean diameter of 3 µm and a pore thickness of 10 µm. A graphene oxide monolayer containing Ag globular nanoparticles (GO/Ag NPs) with diameters of 5–30 nm was fabricated and doped in an ion-exchanging Nafion membrane to improve its carrier transfer, water-saving, and ion-exchange capabilities, which thus enhanced the electromechanical response of IPMC. After being attached to PMVS micropillars, IPMC was actuated by square wave inputs at 1.0, 1.5, or 2.0 V to bend back and forth, driving the micropillars to actively grip or release the surface. To determine the adhesion of the micropillars, the normal adsorption and desorption forces were measured as the IPMC drives the setal micropillars to grip and release, respectively. Adhesion results demonstrated that the normal adsorption forces were 5.54-, 14.20-, and 23.13-fold higher than the normal desorption forces under 1.0, 1.5, or 2.0 V, respectively. In addition, shear adhesion or friction increased by 98, 219, and 245%, respectively. Our new technique provides advanced design strategies for reversible gecko-inspired synthetic adhesives, which might be used for spiderman-like wall-climbing devices with unprecedented performance.