278866 Pickering Foams Stabilized by α-Zirconium Phosphate-Propylamine Nano-Sheets

Thursday, November 1, 2012: 9:55 AM
412 (Convention Center )
Juan S. Guevara1, Andres F. Mejia1, Ya-Wen Chang1, Min Shuai1, M. Sam Mannan2 and Zhengdong Cheng3, (1)Chemical Engineering, Texas A&M University, College Station, TX, (2)Mary Kay O'Connor Process Safety Center, Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, (3)Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX

We demonstrate the stabilization of Pickering foams utilizing partially hydrophobic inorganic nano-sheets with a thickness at atomic scale. The nano-sheets are obtained by intercalation and exfoliation of ZrP crystals using propylamine as a guest molecule. Subsequently, the hydrophobicity of the nano-sheets is adjusted by adsorbing different quantities of propylamine using the ion-exhange properties of ZrP. The adsorption of propylamine on the nano-sheet surfaces grants an inherent hydrophobicity that enables the nano-sheets to adsorb on the air-water interface. The foam stability was studied by calculating the rate of water drainage as a function of time. The foams exhibit excellent stability even at low nano-sheet concentrations. In addition, the foam-to-water ratio was evaluated by varying the nano-sheet concentration and the degree of hydrophobicity. Cross-polarizing micrographs and scanning electron microscopy observations revealed the adsorption of the ZrP-propylamine nano-sheets on the air-water interface. We observed that the foams are stabilized by several layers of nano-sheets that prevent the diffusion of gas between the bubbles.

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See more of this Session: Emulsions and Foams I
See more of this Group/Topical: Engineering Sciences and Fundamentals