Stabilization of Pickering foams by high-aspect-ratio nano-sheets

Juan S Guevara, Andres F Mejia, Min Shuai, Ya-Wen Chang, M. Sam Mannan, Zhengdong Cheng

Research output: Contribution to journalArticle

Abstract

We developed Pickering foams highly stabilized by high-aspect-ratio ([small xi] = diameter/thickness) nano-sheets. The effects of particle aspect ratio, concentration, and hydrophobicity were also investigated. To our knowledge, our study provides the first experimental evidence of the effect of particle aspect ratio on particle-stabilized foams. The adsorption properties of these highly anisotropic nano-sheets are strongly affected by their small thickness and large lateral size (i.e., two-dimensional). These high-aspect-ratio nano-sheets were obtained by exfoliation of [small alpha]-zirconium phosphate (ZrP) crystals with propylamine (C3H7NH2, PA). The hydrophobicity of the nano-sheets was tailored by adjusting the PA : ZrP molar ratio in the suspension. The morphology and stability of the foam depend on the nano-sheet aspect ratio and concentration as well as on the PA : ZrP molar ratio. Here, we found that using low and high aspect ratio nano-sheets having a high and an intermedia
Original languageEnglish
Pages (from-to)1327-1336
JournalSoft Matter
DOIs
StatePublished - 2013

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