Interfacial Viscoelasticity of Self-Assembled Hydrophobic/Hydrophilic Particles at an Air/Water Interface

Syed Ehsanur Rahman, Nader Laal-Dehghani, Gordon F. Christopher

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Hydrophobic/hydrophilic mixtures of latex particles at an air/water interface self-assemble, creating space filling, interconnected aggregates as the relative surface fractions of the dissimilar particles approach 0.5, which is reflected both in qualitative observation and fractal dimension of the microstructure. It is hypothesized that this change in microstructure occurs due to an asymmetry in the electrostatic interaction between similar and dissimilar particles caused by polarization of hydrophilic particles by hydrophobic particles. The changes in both microstructure and interparticle interactions significantly impact the interfacial viscoelasticity. As greater shape complexity is observed, interfacial complex moduli can increase by as much as 3 orders of magnitude and interfaces become more elastic.

Original languageEnglish
Pages (from-to)13116-13125
Number of pages10
JournalLangmuir
Volume35
Issue number40
DOIs
StatePublished - Oct 8 2019

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