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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >pH-responsive superomniphobic nanoparticles as versatile candidates for encapsulating adhesive liquid marbles
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pH-responsive superomniphobic nanoparticles as versatile candidates for encapsulating adhesive liquid marbles

机译：pH-响应超瘤纳米粒子作为封装粘合剂液体大理石的多功能候选物

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摘要

Conventional adhesives are rarely used in sophisticated applications such as micro-fluidic devices or 'operations of bonding from a distance' due to their permanent wetting characteristics. Liquid marbles offer exceptional switching between non-wetting and wetting on demand. In this contribution, we present a novel approach to encapsulate both hydrophilic (epoxy resin) and hydrophobic (siloxane polymer) liquids via wrapping them with superomniphobic nanoparticles. The free energy for marble formation is lower for a hydrophobic liquid (0.931 x 10(-16) J), whereas a hydrophilic liquid registers a higher value of 1.86 x 10(-16) J. The mechanical bursting energy for hydrophobic marbles (20 mu J) is lower than that for their hydrophilic counterpart (48.6 mu J). The static friction coefficients of epoxy-based liquid marble are between 0.015 and 0.020 on glass, aluminium and stainless steel substrates. As a highlight, the nanoparticle coating is responsive to pH, and the bursting time of the liquid marbles can be tuned from <1 minute to several hours. It is demonstrated that the adhesive strength of cross-linked epoxy obtained by a liquid marble route is higher than that obtained vis-a-vis a conventional wetting route. The liquid marbles presented in this work can be ruptured by changing the pH, have a lower friction coefficient compared to the bare liquids (more rolling distance, which is highly essential for bonding of an intricate space from a distance) and are useful as dry adhesives.
机译：常规粘合剂很少用于复杂的应用，例如由于它们的永久性润湿特性，诸如微流体器件或从远处键合的操作。液体大理石提供不润湿和需求润湿之间的卓越切换。在这一贡献中，我们介绍了一种新的方法，通过将它们与超级尼氏菌纳米颗粒包裹在一起来包封亲水性（环氧树脂）和疏水性（硅氧烷聚合物）液体。疏水液体（0.931×10（-16）j）的大理石形成的自由能较低，而亲水液体寄存器较高的1.86×10（-16）J.用于疏水大理石的机械爆破能量（20 Mu J）低于亲水性对应物（48.6μJ）。环氧基液体大理石的静摩擦系数在玻璃，铝和不锈钢基材上的0.015和0.020之间。作为亮点，纳米粒子涂层响应于pH，液体大理石的爆破时间可以从<1分钟到几个小时调节。结果证明，通过液体大理石途径获得的交联环氧树脂的粘合强度高于得到的Vis-A-Vis常规润湿途径。在该作品中呈现的液体大理石可以通过改变pH来破裂，与裸露的液体相比具有较低的摩擦系数（更多的滚动距离，这对于从远处粘接错综复杂的空间非常重要）并且可用作干粘合剂。

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