Nanoparticles of varying hydrophobicity at the emulsion droplet-water interface: adsorption and coalescence stability

Langmuir : the ACS Journal of Surfaces and Colloids
Spomenka Simovic, Clive A Prestidge

Abstract

The coalescence stability of poly(dimethylsiloxane) emulsion droplets in the presence of silica nanoparticles ( approximately 50 nm) of varying contact angles has been investigated. Nanoparticle adsorption isotherms were determined by depletion from solution. The coalescence kinetics (determined under coagulation conditions at high salt concentration) and the physical structure of coalesced droplets were determined from optical microscopy. Fully hydrated silica nanoparticles adsorb with low affinity, reaching a maximum surface coverage that corresponds to a close packed monolayer, based on the effective particle radius and controlled by the salt concentration. Adsorbed layers of hydrophilic nanoparticles introduce a barrier to coalescence of approximately 1 kT, only slightly reduce the coalescence kinetics, and form kinetically unstable networks at high salt concentrations. Chemically hydrophobized silica nanoparticles, over a wide range of contact angles (25 to >90 degrees ), adsorb at the droplet interface with high affinity and to coverages equivalent to close-packed multilayers. Adsorption isotherms are independent of the contact angle, suggesting that hydrophobic attraction overcomes electrostatic repulsion in all cases. T...Continue Reading

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Citations

Dec 7, 2007·Physical Chemistry Chemical Physics : PCCP·Nasrin Ghouchi EskandarClive A Prestidge
Aug 25, 2010·Physical Chemistry Chemical Physics : PCCP·Bernard P BinksKenneth Wong
Dec 29, 2015·Journal of Colloid and Interface Science·Kevin S SilmoreNewell R Washburn
Apr 9, 2013·Journal of Colloid and Interface Science·Hossein Rezvantalab, Shahab Shojaei-Zadeh
Oct 27, 2011·International Journal of Pharmaceutics·Laurent PergePhilippe Legrand
Aug 31, 2010·Journal of Colloid and Interface Science·Justyna FrelichowskaYves Chevalier
Oct 22, 2008·Journal of Colloid and Interface Science·Catherine P WhitbyJohn Ralston
Jan 2, 2007·Advances in Colloid and Interface Science·R MillerM Michel
Feb 10, 2009·Journal of Food Science·D RousseauH Park
Sep 9, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Susanne SihlerUlrich Ziener
Oct 2, 2007·Advances in Colloid and Interface Science·Timothy N HunterGraeme J Jameson
Aug 26, 2006·International Journal of Pharmaceutics·Clive A Prestidge, Spomenka Simovic
Jun 23, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Sepideh RazaviIlona Kretzschmar
Jun 11, 2011·Journal of Colloid and Interface Science·Catherine P WhitbyJohn Ralston
Aug 12, 2016·Soft Matter·Laure RidelYves Chevalier
May 3, 2018·Soft Matter·Xiaoqing HuaMichael A Bevan
Apr 6, 2019·Journal of Colloid and Interface Science·Christopher Griffith, Hugh Daigle
Sep 29, 2006·The Journal of Physical Chemistry. B·Francesca RaveraLibero Liggieri
Mar 23, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Lenore L DaiChih-yuan Wu

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