University of California, Los Angeles
Grant: $262,000 - National Science Foundation - Sep. 7, 2009
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Award Description: Study of the vortex-mediated superfluid transition of helium films adsorbed in porous materials, and study of luminescence from laser-induced bubbles in cryogenic liquids.
Project Description: The properties of liquid helium films adsorbed on carbon nanotubes at low temperatures will be studied, providing a probe of both the structure of the nanotubes and of the superfluidity of the films. The observation of propagating thickness waves (third sound) in the helium film signals the onset of superfluidity, and a novel re-entrant behavior found at the onset point will be studied in detail. Theoretical studies of the superfluid phase transition employing a novel vortex-loop renormalization technique will be carried out. The current theory in three dimensions will be extended to any dimension between two and four, and the effect of a rapid temperature quench on the vortices will be investigated. Work will also be undertaken to study the luminescence resulting from the collapse of laser-induced bubbles in a variety of liquids, including alcohols, organic liquids, and cryogenic liquids such as liquid nitrogen. Studies using liquid ethanol and ethanol-water mixtures will be carried out at temperatures down to -150 C to try to understand why the luminescence is so strongly quenched at room temperature, where only weak luminescence can be found in very dilute mixtures with water.
Jobs Summary: N/A (Total jobs reported: 0)
Project Status: Not Started
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