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首页> 外文OA文献 >Hydrophobic coating- and surface active solvent-mediated self-assembly of charged gold and silver nanoparticles at water-air and water-oil interfaces
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Hydrophobic coating- and surface active solvent-mediated self-assembly of charged gold and silver nanoparticles at water-air and water-oil interfaces

机译：疏水性涂层和表面活性剂介导的带电金和银纳米粒子在水-空气和水-油界面处的自组装

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摘要

We report self-assembly of charge-stabilized gold and silver nanoparticles at water-air and water-oil interfaces, via manipulation of the interactions between the interfaces and the adsorbing nanoparticles. Nanoparticle adsorption from bulk colloids to an interface is an energy-favored, but finite sorption barrier-restrained (kinetics-controlled) process. Consequently, to successfully mediate self-assembly of nanoparticles, the finite sorption barrier should be decreased. That can be accomplished by manipulating its three controlling forces: the repulsive electrostatic force, the repulsive van der Waals force, and the attractive hydrophobic force between the interface and the adsorbing nanoparticles. It was found that hydrophobic coatings change nanoparticle hydrophobicity and greatly increase the attractive hydrophobic force. Surface active organic solvents ( methanol, ethanol, isopropanol, and acetone) decrease the attractive hydrophobic force to some extent. However, they decrease the repulsive electrostatic force to a larger extent, via a "charge dilution'' mechanism, due to their positive adsorption at the charged water-air and water-oil interfaces. Hydrophobic coatings and organic solvents consequently decrease the sorption barrier, facilitate nanoparticles overcoming the sorption barrier, and mediate the self-assembly of nanoparticles.
机译：我们报告通过在界面和吸附纳米粒子之间的相互作用的操纵在水-空气和水-油界面的电荷稳定的金和银纳米粒子的自组装。从本体胶体到界面的纳米颗粒吸附是能量有利的，但受限的吸附势垒受限（动力学控制）过程。因此，为了成功地介导纳米粒子的自组装，应降低有限的吸附势垒。这可以通过操纵其三个控制力来实现：排斥静电力，排斥范德华力以及界面与吸附纳米粒子之间的吸引力疏水力。发现疏水涂层改变了纳米颗粒的疏水性并极大地增加了吸引力的疏水力。表面活性有机溶剂（甲醇，乙醇，异丙醇和丙酮）在一定程度上降低了疏水吸引力。但是，由于它们在带电的水-空气和水-油界面上的正吸附，它们通过“电荷稀释”机制在更大程度上降低了排斥静电力，因此疏水涂层和有机溶剂降低了吸附屏障，促进纳米颗粒克服吸附障碍，并介导纳米颗粒的自组装。

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