Sum frequency vibrationnal spectroscopy of water molecules at
interfaces

Freysz, E.; Du, Qingyang; Shen, Y. R.

doi:10.1051/anphys/1994024

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…Neither of the reported studies paid explicit attention to the possible role of field direction. The observed 20,22,24 alignment of water molecules in the direction of the applied field, however, can couple 22 with the known anisotropy 14,15,[25][26][27][28][29] of interfacial water. This suggests that the angle between the direction of the applied field and water/solid surfaces can also play a significant role in field-induced wetting of nanoscaled hydrophobic confinements.…”

Section: Introductionmentioning

confidence: 99%

Effect of Field Direction on Electrowetting in a Nanopore

et al. 2007

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We manifest a significant influence of field direction and polarity on surface wetting, when the latter is tuned by application of an external electric field. Thermodynamics of field-induced filling of hydrocarbon-like nanopores with water is studied by open ensemble molecular simulation. Increased field strength consistently results in water-filling and electrostriction in hydrophobic nanopores. A threshold field commensurate with surface charge density of about one elementary charge per 10 nm2 suffices to render prototypical paraffin surfaces hydrophilic. When a field is applied in the direction perpendicular to the confining walls, the competition between orientational polarization and angle preferences of interfacial water molecules relative to the walls results in an asymmetric wettability of opposing surfaces (Janus interface). Reduction of surface free energy observed upon alignment of confinement walls with field direction suggests a novel mechanism whereby the applied electric field can operate selectively on water-filled nanotubes while empty ones remain unaffected.

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Section: Introductionmentioning

confidence: 99%

Effect of Field Direction on Electrowetting in a Nanopore

et al. 2007

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“…Liquid water interfaces are ubiquitous and important in chemistry and the environment. Thus, with the advent of interface specific nonlinear optical spectroscopies, such interfaces have been intensely studiedboth theoretically − and experimentally. − Sum frequency generation (SFG) spectroscopy is a powerful experimental method for probing the structure and dynamics of interfaces. SFG is a second-order polarization experiment, and the more common electronically nonresonant experiment is the main focus of this review (although the theory of other second-order processes is discussed).…”

Section: Introductionmentioning

confidence: 99%

Theoretical Modeling of Interface Specific Vibrational Spectroscopy: Methods and Applications to Aqueous Interfaces

et al. 2006

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“…For example, Braslau et al 1 determined the thickness of the liquid water interface to be ϳ3.2 Å. Several groups [2][3][4][5] have exploited sum-frequency-generation ͑SFG͒ spectroscopy to identify unique surface vibrational resonances, as well as molecular orientation for a variety of liquid/vapor, liquid/liquid, and liquid/solid interfaces. Molecular-beam scattering studies reported Nathanson and co-workers 6 have explored the influence of microscopic sur-face corrugation on collision dynamics.…”

Section: Introductionmentioning

confidence: 99%

Investigation of volatile liquid surfaces by synchrotron x-ray spectroscopy of liquid microjets

Wilson

Rude

Smith

et al. 2004

Review of Scientific Instruments

116

120

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Soft x-ray absorption spectroscopy is a powerful probe of surface electronic and geometric structure in metals, semiconductors, and thin films. Because these techniques generally require ultrahigh vacuum, corresponding studies of volatile liquid surfaces have hitherto been precluded. We describe the design and implementation of an x-ray experiment based on the use of liquid microjets, permitting the study of volatile liquid surfaces under quasi-equilibrium conditions by synchrotron-based spectroscopy. The liquid microjet temperatures are also characterized by Raman spectroscopy, which connects our structural studies with those conducted on liquid samples under equilibrium conditions. In recent experiments, we have observed and quantified the intermolecular surface relaxation of liquid water and methanol and have identified a large population of ''acceptor-only'' molecules at the liquid water interface.

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Sum frequency vibrationnal spectroscopy of water molecules at interfaces

Cited by 7 publications

References 9 publications

Effect of Field Direction on Electrowetting in a Nanopore

Effect of Field Direction on Electrowetting in a Nanopore

Theoretical Modeling of Interface Specific Vibrational Spectroscopy: Methods and Applications to Aqueous Interfaces

Investigation of volatile liquid surfaces by synchrotron x-ray spectroscopy of liquid microjets

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