Physics and Astronomy Colloquia

*Winter Quarter Colloquia Start at 4:00 pm*

Title: Beyond Wrinkling: Stress Relaxation in Lung Surfactant Monolayers and Other Thin Films

Speaker: Ka Yee Lee, University of Chicago

Abstract: Surfactants at air/water interfaces are often subjected to mechanical stresses as the interfaces they occupy are reduced in area. For lung surfactants during exhalation, the monolayer collapse manifests itself as protrusions of folds into the subphase. These folds remain attached to the monolayer and reversibly reincorporated upon expansion (inhalation). This folding transition in monolayers is not limited to lung surfactant films, but rather represents a much more general type of stress relaxation mechanism. Collapse modes are found most closely linked to in-plane rigidity. We characterize the rigidity of the monolayer by analyzing in-plane morphology on numerous length scales. More rigid monolayers collapse out-of-plane via a hard elastic mode similar to an elastic membrane, with the folded state being the final collapse state, while softer monolayers relax in-plane by shearing. For the hard elastic mode of collapse, we have further demonstrated experimentally and theoretically that the folded state is preceded by a wrinkled state, and similar wrinkle to fold transitions has been observed in elastic thin films ranging from 2 nm to 10 μm in thickness of completely different chemical nature (lung surfactant lipid monolayers, gold nanoparticle trilayers, and polyester sheets).

Host: Dutta

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Keywords: Physics, Astronomy, colloquium


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Damiano Caprioli: TBA

January 19, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Damiano Caprioli, University of Chicago

Abstract: TBA

Host: Tchekhovskoy

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Keywords: Physics, Astronomy, colloquium


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Mark Wis: TBA

January 26, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Mark Wise, Caltech

Abstract: TBA

Host: De Gouvea

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Keywords: Physics, Astronomy, colloquium


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Kate Ross: TBA

February 2, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Kate Ross, Colorado State University 

Abstract: TBA

Host: 

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Keywords: Physics, Astronomy, colloquium


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Alexandra Boltasseva: TBA

February 9, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Alexandra Boltasseva, Purdue University

Abstract: TBA

Host: Stern

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Keywords: Physics, Astronomy, colloquium


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Joel Moore: TBA

March 2, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Joel Moore, UC Berkeley

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Gerald Gabrielse: TBA

March 16, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Gerald Gabrielse, Northwestern University, Department of Physics & Astronomy 

Abstract: TBA

Host: Schmitt

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Keywords: Physics, Astronomy, colloquium


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Vidya Madhavan: TBA

April 6, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker: Vidya Madhavan, UIUC

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Peter Armitage: TBA

April 20, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Peter Armitage, Johns Hopkins University

Abstract: TBA

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Keywords: Physics, Astronomy, colloquium


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Subir Sachdev: TBA

May 11, 2018, 4:00 PM - 5:00 PM

Title: TBA

Speaker:Subir Sachdev, Harvard University 

Abstract: TBA

Host:

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Keywords: Physics, Astronomy, colloquium