Aggregation and Stabilization of Colloidal Spheroids by Oppositely Charged Spherical Nanoparticles

Langmuir : the ACS Journal of Surfaces and Colloids
Siliveru UpendarMadivala G Basavaraj

Abstract

Heteroaggregation of colloids is an important yet complex physical process involving colloidal/nanosized particles and is relevant in river delta formation, paper-making, water treatment, blood flocculation, and so on. Despite the earlier studies on oppositely charged spherical colloids, heteroaggregation of colloids of different shapes is less explored. In this regard, we report an experimental study to investigate the colloidal stability of mixture of positively charged spheroidal hematite and negatively charged spherical silica nanoparticles. In this study, pH and surface area ratio (silica to hematite, SS-H) are varied to tune the colloidal stability/instability of the suspension. At pH 6.5 and low SS-H, the silica particles adsorb onto the hematite particles and reduce the effective charge of the latter, leading to aggregation and resulting in unstable dispersions. At higher SS-H, adsorption of silica on hematite leads to overcharging and charge reversal, which leads to a stable dispersion. Similar experiments were performed at pH 2.4 and 3.5, and the crossover from unstable to stable dispersion is observed as a function of SS-H. Calculation of Derjaguin, Landau, Verwey, and Overbeek (DLVO) interaction between particles in...Continue Reading

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Citations

Mar 11, 2020·Soft Matter·Marcel ReyNicolas Vogel
Aug 23, 2020·International Journal of Molecular Sciences·Katarzyna ŁudzikMałgorzata Jóźwiak
Aug 25, 2018·Environmental Science & Technology·Guocheng LiuBaoshan Xing
Dec 8, 2021·The Journal of Physical Chemistry. B·Shumaila ShahidMadivala G Basavaraj

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