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Aggregation Dynamics of Nanoparticles at Solid-Liquid Interface

Abstract

The dynamics of molecules or nanoparticles (NPs) at solid-liquid interfaces plays an important role in many natural and industrial processes. However, the effect of solid surface at solid-liquid interface on NP motion and interaction between these NPs is still not well understood. Here, using in situ liquid cell transmission electron microscopy (TEM), we directly observed the movement of gold NPs and their aggregation dynamics at solid-liquid interfaces. We found that the solid surface transiently pins the NPs during their aggregation dampening their translational and rotational movements. This surface pinning reduces both the movement and the aggregation rate of NPs as aggregates grow through attachment. However, pinning of NP aggregates affects their translational and rotational motions differently. Initially, with increasing aggregate size, dampening of translational motion of NPs is stronger than for the rotational motion. Consequently, the initial stages of aggregation are dominated both by translational and rotational motions whereas the later aggregation stages are dominated by rotational movement of these aggregates. Our results provide insights into the movements of NPs and their aggregates at solid-liquid interfaces, which may assist in future design and control of NP assemblies at interfaces.

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Publication details

The article was received on 21 Mar 2017, accepted on 03 Jun 2017 and first published on 06 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR01985H
Citation: Nanoscale, 2017, Accepted Manuscript
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    Aggregation Dynamics of Nanoparticles at Solid-Liquid Interface

    X. Tian, H. Zheng and U. Mirsaidov, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR01985H

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