Nano ellipsoids at the fluid-fluid interface: effect of surface charge on adsorption, buckling and emulsification

Faraday Discussions
Venkateshwar Rao DugyalaMadivala G Basavaraj

Abstract

In this contribution, we discuss the role of surface charge on the adsorption of shape anisotropic particles to fluid-fluid interfaces in the context of their application in particle-stabilized emulsions. Starting with a pendent aqueous drop containing nano-ellipsoids of known surface charge density suspended in an oil medium, we study the kinetics of adsorption of the ellipsoids to the water-decane interface using pendant drop tensiometry. The interfacial tension of the drop is recorded as a function of time by analyzing the shape of the drop. We show that the particles that are weakly charged readily adsorb to the water-decane interface and the adsorption behavior is influenced by the particle surface charge density. Furthermore, as the area available for the particles deposited at the interface is reduced, the interface populated with self-assembled ellipsoids shows wrinkles indicating buckling of the particle-laden interface under compression. However, the buckling is not observed if nano-ellipsoids are highly charged confirming that the particles do not adsorb to the interface when they are highly charged. This suggests that in several examples where the particles at interfaces concept is exploited, the repulsive energy ba...Continue Reading

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Citations

Feb 11, 2016·Physical Chemistry Chemical Physics : PCCP·Venkateshwar Rao DugyalaMadivala G Basavaraj
Nov 15, 2017·Physical Chemistry Chemical Physics : PCCP·Thriveni G Anjali, Madivala G Basavaraj
Jun 20, 2020·Physical Chemistry Chemical Physics : PCCP·Neethu ThomasEthayaraja Mani
Apr 26, 2021·Journal of Colloid and Interface Science·Shumaila Shahid, Madivala G Basavaraj
Jun 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Hemant KumarMadivala G Basavaraj
May 16, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal Bertsch, Peter Fischer
Oct 12, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Thriveni G Anjali, Madivala G Basavaraj
Aug 28, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Ranajit MondalMadivala G Basavaraj
Jul 11, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Thriveni G Anjali, Madivala G Basavaraj
Dec 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Saul J Hunter, Steven P Armes

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