Superhydrophobic Alkanethiol-Coated Microsubmarines for Effective Removal of Oil
Superhydrophobic Alkanethiol-Coated Microsubmarines for Effective Removal of Oil
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DOI：
10.1021/nn301175b
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发表时间：
2012-05-01
期刊：
影响因子：
17.1
通讯作者：
Wang, Joseph
中科院分区：
文献类型：
--
作者：
Guix, Maria;Orozco, Jahir;Wang, Joseph
我们展示了人工纳米机器在油滴的有效相互作用、捕获、运输和去除方面的应用。这种基于纳米机器的简单集油方法是通过用超疏水层修饰微管引擎实现的，该超疏水层能够通过其对在装置粗糙的金外表面上形成的长链自组装单分子层（SAMs）的烷硫醇的强附着力来吸附油。所得的SAM涂层的Au/Ni/PEDOT/Pt微型潜艇显示出与大油滴的持续相互作用，并且能够装载和运输多个小油滴。研究了烷硫醇链长、极性和头部官能团以及表面疏水性对油 - 纳米马达相互作用和推进的影响。在涉及未改性的微引擎以及涂有含极性末端基团的SAM层的微引擎的对照实验中，未观察到这种油 - 马达相互作用。这些结果表明，这种SAM - Au/Ni/PEDOT/Pt微型机器可用于简便、快速和高效地收集水样中的油，这可能被用于其他水 - 油分离系统。将吸油特性集成到自推进微引擎中，对于修复受油污染的水样以及分离其他疏水目标（如药物）具有很大的前景。
We demonstrate the use of artificial nanomachines for effective interaction, capture, transport, and removal of oil droplets. The simple nanomachine-enabled oil collection method is based on modifying microtube engines with a superhydrophobic layer able to adsorb oil by means of its strong adhesion to a long chain of self-assembled monolayers (SAMs) of alkanethiols created on the rough gold outer surface of the device. The resultant SAM-coated Au/Ni/PEDOT/Pt microsubmarine displays continuous interaction with large oil droplets and is capable of loading and transporting multiple small oil droplets. The influence of the alkanethiol chain length, polarity, and head functional group and hence of the surface hydrophobicity upon the oil-nanomotor Interaction and the propulsion is examined. No such oil-motor interactions were observed in control experiments involving both unmodified microengines and microengines coated with SAM layers containing a polar terminal group. These results demonstrate that such SAM-Au/Ni/PEDOT/Pt micromachines can be useful for a facile, rapid, and efficient collection of oils in water samples, which can be potentially exploited for other water-oil separation systems. The integration of oil-sorption properties into self-propelled microengines holds great promise for the remediation of oil-contaminated water samples and for the isolation of other hydrophobic targets, such as drugs.