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Capillary Foams: Stabilization and Functionalization of Porous Liquids and Solids

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School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0100, United States
Scripps Institution of Oceanography, Marine Biology Research Division, University of California—San Diego, La Jolla, California 92093, United States
*S.H.B. e-mail: [email protected]
*J.C.M. e-mail: [email protected]
Cite this: Langmuir 2015, 31, 9, 2669–2676
Publication Date (Web):February 17, 2015
Copyright © 2015 American Chemical Society

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    Abstract Image

    Liquid foams are two-phase systems in which a large volume of gas is dispersed as bubbles in a continuous liquid phase. These foams are ubiquitous in nature. In addition, they are found in industrial applications, such as pharmaceutical formulation, food processing, wastewater treatment, construction, and cosmetics. Recently, we reported a new type of foam material, capillary foam, which is stabilized by the synergistic action of particles and a small amount of an immiscible secondary liquid. In this study, we explore in more detail the foam preparation routes. To illustrate some of the potential applications, we create vividly colored wet and dried foams, which are difficult to prepare using traditional methods, and load-bearing porous solids. The combined action of particles and immiscible secondary fluid confers exceptional stability to capillary foams and many options for functionalization, suggesting a wide range of possible applications.

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