Yi Zhang, a graduate student co-advised by Prof. Sven Behrens and Prof. Carson Meredith in the School of Chemical & Biomolecular Engineering at Georgia Tech, is shown holding a porous solid material prepared from a capillary foam.
Anyone who has blown a bubble and seen how quickly it pops has first-hand experience on the major challenge in creating stable foams.
At its most basic level, foam is a bunch of bubbles squished together. Liquid foams, a state of matter that arises from tiny gas bubbles dispersed in a liquid, are familiar in everyday life, from beer to bathwater. They also are important in commercial products and processes, including pharmaceutical formulation, oil production, food processing, cleaning products, cosmetics, or hair and skin care products. Lightweight dry foams for the construction of buildings, automobiles and airplanes are key materials in the push for sustainability and energy efficiency. Making lightweight foam has one big challenge, however, keeping the foam stable.
A team of researchers from the Georgia Institute of Technology has developed a new type of foam – called capillary foam – that solves many of the problems faced by traditional foams. The new research shows for the first time that the combined presence of particles and a small amount of oil in water-based foams can lead to exceptional foam stability when neither the particles nor the oil can stabilize the foams alone.
“It’s very difficult to stabilize foams, and we want foams that are stable for months or years,” said Sven Behrens, study co-author and professor in the School of Chemical and Biomolecular Engineering at Georgia Tech. “We’ve developed a way to make foams that is much easier and more broadly applicable that what is traditionally used.”
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The Latest on: Dry Foams
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