Ion-specific aggregation of hydrophobic particles

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Teresa López-LeónDelfina Bastos-González

Abstract

This work shows that colloidal stability and aggregation kinetics of hydrophobic polystyrene (PS) nanospheres are extremely sensitive to the nature of the salt used to coagulate them. Three PS latices and four aggregating electrolytes, which all share the same cation (Na(+)) but have various anions located at different positions in the classical Hofmeister series depending on their kosmotropic or chaotropic character, are used. The present study focuses on analyzing different aggregating parameters, such as critical coagulation concentrations (CCC), cluster size distributions (CSD), initial kinetic constants K(11), and fractal dimensions of the aggregates d(f). While aggregation induced by SO(4)(2-) and Cl(-) behaved according to the predictions of the classical Derjaguin-Landau-Verwey-Overbeek theory, important discrepancies are found with NO(3)(-), which become dramatic when using SCN(-). These discrepancies among the anions were far more significant when they acted as counterions rather than as co-ions. While SO(4)(2-) and Cl(-) trigger fast diffusion-limited aggregation, SCN(-) gives rise to a stationary cluster size distribution in a few aggregation times when working with cationic PS particles. Clear differences are found...Continue Reading

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Citations

Oct 23, 2014·The Journal of Physical Chemistry. B·Benxin JingYingxi Zhu
Mar 18, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Tamas OncsikIstvan Szilagyi
Nov 2, 2015·Journal of Colloid and Interface Science·Li ZhangAnniina Salonen
Nov 4, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Marko PavlovicIstvan Szilagyi
Aug 25, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Raju NandaAnil Kumar
Oct 26, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·F Javier Montes Ruiz-CabelloM Cabrerizo-Vilchez
Feb 24, 2016·Physical Chemistry Chemical Physics : PCCP·Tamas OncsikIstvan Szilagyi
Mar 22, 2016·Soft Matter·Marko PavlovicIstvan Szilagyi
Feb 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Tímea HegedűsZoltán Kónya
May 30, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Weiyan YuWanguo Hou
Apr 6, 2019·The Journal of Physical Chemistry. B·Jean-Luc Trompette, Jean-François Lahitte
Oct 5, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Bojana KatanaIstvan Szilagyi

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