Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 10, Pages 3733-3737Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1211749110
Keywords
liquid surface; resonant scattering; surface structure
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Funding
- US Department of Energy's Office of Basic Energy Sciences through the Advanced Light Source (ALS) at LBNL [DE-AC02-05CH11231]
- Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center [DE-SC0001015]
- United States-Israel Binational Science Foundation
- US Department of Energy Basic Energy Sciences [DE-AC02-76CH0016]
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The molecular-scale structure of the ionic liquid [C(18)mim](+)[FAP](-) near its free surface was studied by complementary methods. X-ray absorption spectroscopy and resonant soft X-ray reflectivity revealed a depth-decaying near-surface layering. Element-specific interfacial profiles were extracted with submolecular resolution from energy-dependent soft X-ray reflectivity data. Temperature-dependent hard X-ray reflectivity, small-and wide-angle Xray scattering, and infrared spectroscopy uncovered an intriguing melting mechanism for the layered region, where alkyl chain melting drove a negative thermal expansion of the surface layer spacing.
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