Spontaneous Detachment of Colloids from Primary Energy Minima by Brownian Diffusion

PloS One
Zhan WangBaoguo Li

Abstract

The Derjaguin-Landau-Verwey-Overbeek (DLVO) interaction energy profile has been frequently used to interpret the mechanisms controlling colloid attachment/detachment and aggregation/disaggregation behavior. This study highlighted a type of energy profile that is characterized by a shallow primary energy well (i.e., comparable to the average kinetic energy of a colloid) at a small separation distance and a monotonic decrease of interaction energy with separation distance beyond the primary energy well. This energy profile is present due to variations of height, curvature, and density of discrete physical heterogeneities on collector surfaces. The energy profile indicates that colloids can be spontaneously detached from the shallow primary energy well by Brownian diffusion. The spontaneous detachment from primary minima was unambiguously confirmed by conducting laboratory column transport experiments involving flow interruptions for two model colloids (polystyrene latex microspheres) and engineered nanoparticles (fullerene C60 aggregates). Whereas the spontaneous detachment has been frequently attributed to attachment in secondary minima in the literature, our study indicates that the detached colloids could be initially attached...Continue Reading

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Citations

Mar 10, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Ehsan MoaseriKeith P Johnston
Apr 10, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Alexandr JonášErnst-Ludwig Florin
Apr 14, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Rebecca van der WestenHenk J Busscher
Dec 22, 2017·Environmental Science & Technology·Olubukola S AlimiNathalie Tufenkji
Mar 7, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Johnas Eklöf-ÖsterbergKasper Moth-Poulsen

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Methods Mentioned

BETA
atomic force microscopy

Software Mentioned

Matlab

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