Schwenke Konrad, Isa Lucio, Del Gado Emanuela
Department of Civil, Environmental and Geomatic Engineering, and §Laboratory for Interfaces, Soft Matter and Assembly, Department of Materials, ETH Zürich , 8093 Zurich, Switzerland.
Langmuir. 2014 Mar 25;30(11):3069-74. doi: 10.1021/la404254n. Epub 2014 Mar 11.
Experiments with the self-assembly of nanoparticles at liquid interfaces suggest that cooperative and slow dynamical processes due to particle crowding at the interface govern the adsorption and properties of the final assembly. Here we report a numerical approach to studying nonequilibrium adsorption, which elucidates these experimental observations. The analysis of particle rearrangements shows that local ordering processes are directly related to adsorption events at high interface coverage. Interestingly, this feature and the mechanism coupling local ordering to adsorption do not seem to change qualitatively upon increasing particle size polydispersity, although the latter changes the interface microstructure and its final properties. Our results indicate how adsorption kinetics can be used for the fabrication of 2D nanocomposites with controlled microstructure.
在液体界面进行的纳米颗粒自组装实验表明，由于界面处颗粒拥挤导致的协同且缓慢的动力学过程控制着最终组装体的吸附和性质。在此，我们报告一种研究非平衡吸附的数值方法，该方法阐明了这些实验观察结果。对颗粒重排的分析表明，局部有序化过程与高界面覆盖率下的吸附事件直接相关。有趣的是，尽管粒径多分散性会改变界面微观结构及其最终性质，但这一特征以及将局部有序化与吸附相耦合的机制在粒径多分散性增加时似乎并未发生定性变化。我们的结果表明了吸附动力学如何可用于制备具有可控微观结构的二维纳米复合材料。
