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首页> 外文期刊>Advanced Functional Materials >Temperature-Induced Switchable Adhesion using Nickel-Titanium-Polydimethylsiloxane Hybrid Surfaces
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Temperature-Induced Switchable Adhesion using Nickel-Titanium-Polydimethylsiloxane Hybrid Surfaces

机译：使用镍-钛-聚二甲基硅氧烷杂化表面的温度诱导可转换粘合力

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摘要

A switchable dry adhesive based on a nickel-titanium (NiTi) shape-memory alloy with an adhesive silicone rubber surface has been developed. Although several studies investigate micropatterned, bioinspired adhesive surfaces, very few focus on reversible adhesion. The system here is based on the indentation-induced two-way shape-memory effect in NiTi alloys. NiTi is trained by mechanical deformation through indentation and grinding to elicit a temperature-induced switchable topography with protrusions at high temperature and a flat surface at low temperature. The trained surfaces are coated with either a smooth or a patterned adhesive polydimethylsiloxane (PDMS) layer, resulting in a temperature-induced switchable surface, used for dry adhesion. Adhesion tests show that the temperature-induced topographical change of the NiTi influences the adhesive performance of the hybrid system. For samples with a smooth PDMS layer the transition from flat to structured state reduces adhesion by 56%, and for samples with a micropatterned PDMS layer adhesion is switchable by nearly 100%. Both hybrid systems reveal strong reversibility related to the NiTi martensitic phase transformation, allowing repeated switching between an adhesive and a nonadhesive state. These effects have been discussed in terms of reversible changes in contact area and varying tilt angles of the pillars with respect to the substrate surface.
机译：已经开发了一种基于镍钛（NiTi）形状记忆合金且具有粘性硅橡胶表面的可转换干式粘合剂。尽管有几项研究调查了微图案的，受生物启发的胶粘剂表面，但很少有人关注可逆的胶粘剂。这里的系统基于NiTi合金中压痕引起的双向形状记忆效应。 NiTi通过压痕和磨削进行机械变形训练，以引发温度引起的可切换形貌，该形貌具有高温突起和低温平坦表面。训练后的表面涂有光滑的或有图案的粘性聚二甲基硅氧烷（PDMS）层，形成了温度感应可切换的表面，用于干式粘合。粘合力测试表明，温度引起的NiTi形貌变化会影响混合系统的粘合性能。对于具有平滑PDMS层的样品，从平整状态到结构化状态的过渡将粘附力降低56％，对于具有微图案PDMS层的样品，粘附力可切换近100％。两种混合体系均显示出与NiTi马氏体相变有关的强可逆性，从而允许在粘合状态和非粘合状态之间反复切换。已经就接触面积的可逆变化和支柱相对于基板表面的变化倾斜角讨论了这些效果。

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