Milk Fracking (Apker Award, Undergrad Institution)
ORAL · Invited
Abstract
When a solution of dish soap, water, and food dye is touched to the surface of cow's milk, something remarkable happens: a symmetric, sharp pointed starburst emerges from the contact point. While an outward expansion is expected due to the Marangoni effect, the appearance of the star tips can only be explained by the fracture of a thin protein film at the milk-air interface.
To characterize this phenomenon, we develop a mechanical model that predicts hypocycloidal brittle fracture in adsorbed protein films subject to an in-plane, radial Marangoni pressure.
Using high speed imaging, we capture the early-time evolution of starburst fracture on aqueous beta-Lactoglobulin (bovine whey) protein solutions, and apply our model to measure the fracture energy of these protein films.
To characterize this phenomenon, we develop a mechanical model that predicts hypocycloidal brittle fracture in adsorbed protein films subject to an in-plane, radial Marangoni pressure.
Using high speed imaging, we capture the early-time evolution of starburst fracture on aqueous beta-Lactoglobulin (bovine whey) protein solutions, and apply our model to measure the fracture energy of these protein films.
*Acknowledgment is made to the donors of the American Chemical Society Petroleum Research Fund and to the U.S. National Science Foundation under grant No. DMR-2340259 for support of this research.
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Publication: Planned paper 1: Justyn M. Friedler, Sarah Dané Taïwé, Harrison W. Toll, Jingyi Yuan, June Han, Caroline D. Tally,
Charlotte G. Jones, Mariem Sayahi, Benjamin Tobin, Peter Fischer, and Katharine E. Jensen
Planned paper 2: Justyn M. Friedler and Katharine E. Jensen
Presenters
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Justyn Friedler
- Williams College