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Ordered water structure at hydrophobic graphite interfaces observed by 4D, ultrafast electron crystallography

Yang, Ding-Shyue and Zewail, Ahmed H. (2009) Ordered water structure at hydrophobic graphite interfaces observed by 4D, ultrafast electron crystallography. Proceedings of the National Academy of Sciences of the United States of America, 106 (11). pp. 4122-4126. ISSN 0027-8424. PMCID PMC2657438.

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Interfacial water has unique properties in various functions. Here, using 4-dimensional (4D), ultrafast electron crystallography with atomic-scale spatial and temporal resolution, we report study of structure and dynamics of interfacial water assembly on a hydrophobic surface. Structurally, vertically stacked bilayers on highly oriented pyrolytic graphite surface were determined to be ordered, contrary to the expectation that the strong hydrogen bonding of water on hydrophobic surfaces would dominate with suppressed interfacial order. Because of its terrace morphology, graphite plays the role of a template. The dynamics is also surprising. After the excitation of graphite by an ultrafast infrared pulse, the interfacial ice structure undergoes nonequilibrium “phase transformation” identified in the hydrogen-bond network through the observation of structural isosbestic point. We provide the time scales involved, the nature of ice-graphite structural dynamics, and relevance to properties related to confined water.

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Additional Information:© 2009 by the National Academy of Sciences. Contributed by Ahmed H. Zewail, December 5, 2008 (sent for review November 13, 2008). We thank Dr. Nuk Gedik for his participation in the initial phase of this work; the collaborative effort (21) for study of other substrates and materials will be the subjects of other reports. We also thank Professors H. Eugene Stanley, Sven Hovmöller, and Dongping Zhong for critical reading and helpful suggestions. This work was supported by the National Science Foundation and the Air Force Office of Scientific Research in the Gordon and Betty Moore center for physical biology at Caltech. Author contributions: D.-S.Y. and A.H.Z. performed research and wrote the paper. The authors declare no conflict of interest.
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:hydrophilic and hydrophobic interactions; ice-substrate structure and dynamics; nonequilibrium phase transition
Issue or Number:11
PubMed Central ID:PMC2657438
Record Number:CaltechAUTHORS:20090702-085950558
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Official Citation:Ding-Shyue Yang and Ahmed H. Zewail Ordered water structure at hydrophobic graphite interfaces observed by 4D, ultrafast electron crystallography PNAS 2009 106 (11) 4122-4126; published ahead of print February 25, 2009, doi:10.1073/pnas.0812409106
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14483
Deposited By: Tony Diaz
Deposited On:12 Aug 2009 17:51
Last Modified:03 Oct 2019 00:50

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