Interfacial water structure at polymer gel/quartz interfaces investigated by sum frequency generation spectroscopy

Noguchi, Hidenori; Minowa, Hiroshi; Tominaga, Taiki; Gong, Jian Ping; Osada, Yoshihito; Uosaki, Kohei

doi:10.1039/b807297n

Cited by 40 publications

(50 citation statements)

References 42 publications

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“…lipid or protein) monolayers, SFG spectroscopy provides the vibrational spectrum of only the lipid-or protein-bound water. Here we show, using SFG spectroscopy of (isotopically diluted) water underneath lipid and protein monolayers, that the water structure at these biological interfaces does not exhibit 'icelike' and 'liquid-like' characteristics, as has been claimed previously [7][8][9][10][11][12][13][14].…”

supporting

confidence: 76%

No Ice-Like Water at Aqueous Biological Interfaces

et al. 2012

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The surface vibrational spectrum of water at biological interfaces is often interpreted as having ‘ice-like’ and ‘liquid-like’ components. Here we show that the vibrational spectrum of water at both water–lipid and water–protein interfaces greatly simplifies upon H/D isotopic dilution, which is inconsistent with the presence of ‘ice-like’ structures. The changes in the spectra as a function of isotope content can be explained by intramolecular coupling between bend and stretch vibrations of the water molecules.

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supporting

confidence: 76%

No Ice-Like Water at Aqueous Biological Interfaces

et al. 2012

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“…It is commonly accepted that in the vicinity of hydrophilic interfaces water organizes into ice-like water, which project from the surface by a few nanometers (Noguchi et al 2008;Tian et al 2008;Smith et al 2004). Yoo et al (2011) used NMR spectroscopy to study impact of hydrophilic surfaces on interfacial water dynamics.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

Bodard

Sari

et al. 2015

Future Cities and Environment

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Solar panel conversion efficiency, typically in the twenty percent range, is reduced by dust, grime, pollen, and other particulates that accumulate on the solar panel. Cleaning dirty panels to maintain peak efficiency, which is especially hard to do for large solar-panel arrays. To develop a transparent, anti-soiling Nano-TiO 2 coating to minimize the need for occasional cleaning is the purpose of this study. In our study, a 2D rainwater runoff model along tilted solar panel surface based on the Nusselt solution was established to have better understanding and predicting the behavior of runoff rain water, especially in contact with solar-panel surfaces with Nano-TiO 2 coating. Our simulation results demonstrate that solar-panel surfaces with Nano-TiO 2 coating create a superhydrophilic surface which cannot hold water, showing features of more pronounced in increasing runoff water film velocity comparing to the uncoated surfaces during raining event resulting in better effect of self-cleaning. Validation of our model was performed on titled solar panels for real time outdoor exposure testing in Switzerland. It is found that the dust particles are not easy to adhere to the coated surfaces of the slides comparing with uncoated surfaces, showing great potential for its use in harsh environmental conditions. This study suggests that superhydrophilic self-cleaning solar panel coating maximize energy collection and increases the solar panel's energy efficiency.

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“…The Y-type LB multilayers of the per-deuterated arachidate ͓Fig. 1͑b͔͒ with different layer thicknesses ͑4, 10,20,30,40,50,60,70, and 80 monolayers͒ except for the top-monolayer of the per-protonated arachidate, were deposited by sequential vertical dipping of the hydrophobic gold substrate. The layer thickness of the perdeuterated arachidate bilayer was estimated to be 5.7Ϯ 0.1 nm/ bilayer based on the results obtained by ellipsometry 5 and grazing incidence x-ray diffraction.…”

Section: Methodsmentioning

confidence: 99%

“…1͒. However, for other organic thin films such as a polymer thin film deposited on a substrate surface, [19][20][21][22][23][24][25][26][27][28] the buried interface may also contribute to the resonant SFG signals. The quantitative treatment of such a thin film is practically important and the model needs to be extended to these more general cases.…”

Section: B Organic Thin Film/gold Substratementioning

confidence: 99%

Interference effects in the sum frequency generation spectra of thin organic films. II: Applications to different thin-film systems

Tong

Zhao

et al. 2010

The Journal of Chemical Physics

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In this paper, the results of the modeling calculations carried out for predicting the interference effects expected in the sum frequency generation ͑SFG͒ spectra of a specific thin-layer system, described in the accompanying paper, are tested by comparing them with the experimental spectra obtained for a real thin-layer film comprising an organic monolayer/variable thickness dielectric layer/gold substrate. In this system, two contributions to the SFG spectra arise, a resonant contribution from the organic film and a nonresonant contribution from the gold substrate. The modeling calculations are in excellent agreement with the experimental spectra over a wide range of thicknesses and for different polarization combinations. The introduction of another resonant monolayer adjacent to the gold substrate and with the molecules having a reverse orientation has a significant affect on the spectral shapes which is predicted. If a dielectric substrate such as CaF 2 is used instead of a gold substrate, only the spectral intensities vary with the film thickness but not the spectral shapes. The counterpropagating beam geometry will change both the thickness dependent spectral shapes and the intensity of different vibrational modes in comparison with a copropagating geometry. The influences of these experimental factors, i.e., the molecular orientational structure in the thin film, the nature of the substrate, and the selected incident beam geometry, on the experimental SFG spectra are quantitatively predicted by the calculations. The thickness effects on the signals from a SFG active monolayer contained in a thin liquid-layer cell of the type frequently used for in situ electrochemical measurements is also discussed. The modeling calculation is also valid for application to other thin-film systems comprising more than two resonant SFG active interfaces by appropriate choice of optical geometries and relevant optical properties.

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Interfacial water structure at polymer gel/quartz interfaces investigated by sum frequency generation spectroscopy

Cited by 40 publications

References 42 publications

No Ice-Like Water at Aqueous Biological Interfaces

No Ice-Like Water at Aqueous Biological Interfaces

CFD simulation and validation of self-cleaning on solar panel surfaces with superhydrophilic coating

Interference effects in the sum frequency generation spectra of thin organic films. II: Applications to different thin-film systems

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