Comparing the Relative Interfacial Affinity of Soft Colloids With Different Crosslinking Densities in Pickering Emulsions

Frontiers in Chemistry
Man-Hin Kwok, To Ngai

Abstract

Pickering emulsions prepared by various kinds of soft colloids such as the poly(N-isopropylacrylamide) (PNIPAM)-based microgels, have been studied for decades in order to fabricate stimuli-responsive emulsions. It has been generally viewed that the interfacial properties of the microgel monolayers and the emulsion stability are dominated by the softness or deformability of the microgel particles. However, there is still no convenient way to characterize the adsorption/desorption energy of the microgels at the interface although this is an essential topic for microgel-stabilized emulsions. This paper presents a novel method for directly comparing the relative interfacial affinity of microgel particles with comparable size but different crosslinking densities, therefore, different softness at the oil/water interface. Typical micron-sized PNIPAM-based microgels were synthesized and used in this study. With advanced fluorescent labeling techniques, we are capable of distinguishing different kinds of microgels in a Pickering emulsion. During vigorous agitation, particles with higher adsorption energy are more likely to be found at the oil/water interface instead of the loosely adsorbed counterparts. By counting the ratio of interfac...Continue Reading

References

Jan 13, 2005·Chemical Communications : Chem Comm·To NgaiHelmut Auweter
Mar 8, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Sakiko Tsuji, Haruma Kawaguchi
Oct 9, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Bastian BruggerWalter Richtering
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Jan 13, 2009·International Journal of Pharmaceutics·Justyna FrelichowskaYves Chevalier
Oct 2, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Walter Richtering
Jul 9, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Man-hin KwokTo Ngai
Sep 21, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Mathieu DestribatsValérie Ravaine
Jan 24, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Mathieu DestribatsVéronique Schmitt
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Aug 14, 2015·Soft Matter·Robert W StyleEric R Dufresne
Dec 25, 2015·Nanoscale·Katarzyna ZielińskaMarina Resmini

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Citations

Jan 3, 2019·Soft Matter·Nicholas BallardStefan A F Bon
Nov 30, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Steffen BochenekWalter Richtering
Dec 29, 2020·Advances in Colloid and Interface Science·Iván Navarro ArrebolaGarbine Aguirre
Jan 12, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Tong Zhang, To Ngai

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Methods Mentioned

BETA
X-ray
AFM
dynamic light scattering
electron microscopy

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