Triple-point wetting of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>films adsorbed on silver

Migone, Aldo; Hofmann, A.; Dash, J. G.; Vilches, O. E.

doi:10.1103/physrevb.37.5440

Cited by 34 publications

(15 citation statements)

References 23 publications

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“…As far as wetting phase transitions are concerned, the choice of hydrogen and helium suggests itself, since hydrogen exhibits a continuous wetting transition (at the triple point) [23] on all substrates studied to date, and helium undergoes afirst order wetting transition on cesium surfaces [24-261. It is these two phase transitions on which the present paper concentrates.…”

Section: Twmentioning

confidence: 99%

Hydrogen and helium films as model systems of wetting

et al. 1997

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Optical experiments on the wetting properties of liquid 4He and molecular hydrogen are reviewed. Hydrogen films on noble metal surfaces serve as model systems for studying triple point wetting, a continuous transition between wetting and non‐wetting. By means of optically excited surface plasmons, the adsorbed film thickness for temperatures around, and far below, the bulk melting temperature is measured, and the physical mechanisms responsible for the transition are elucidated. Possible applications for other experiments in pure and applied research are discussed. Thin films and droplets of liquid helium are studied on cesium surfaces, on which there is a first order wetting transition. Our studies concentrate on dynamical observations via surface plasmon microscopy, which provide insight into the morphology of liquid helium droplets spreading at different temperatures. Features corresponding to pinning forces, the prewetting line, and the Kosterlitz‐Thouless transition are clearly observed.

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Section: Twmentioning

confidence: 99%

Hydrogen and helium films as model systems of wetting

et al. 1997

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“…For Rayleigh waves the attenuation 6~ and phase velocity shift 6VR/VR will be proportional to the number N of resonators and to the elastic energy flux at the surface which is proportional to the frequency f In this model a Rayleigh wave interacting with N oscillators with resonance frequency fo and resonance width y is attenuated according to Ref. 7 •f2 &z = NCf (f2o _f2)2 + 72fz (2) and the phase velocity is shifted by…”

Section: The Resonator Modelmentioning

confidence: 99%

Elastic low temperature anomalies of solid hydrogen crystallites

et al. 1997

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“…13.͒ This is expected because the temperature dependence of the dielectric constant of bulk H 2 is small at TϽ20 K. 27 At TрT 3 , however, C(T) shows a complicated behavior because of triple-point wetting. 11,28 The H 2 capillary condensed into the gap between the Vycor and the electrodes dewets at TϽT 3 . An example of this dewetting can be seen in the inset of Fig.…”

Section: B Capacitor Datamentioning

confidence: 99%

“…Our experimental system is analogous to the setup which has been employed to study wetting transitions of various combinations of adsorbates and substrates, and which has provided information on the free energies of adsorbed layers. 11 We selected Vycor as a restricted geometry because a large amount of data has been accumulated for hydrogen and helium in Vycor. Torii et al 4 reported a ''phase'' diagram of H 2 in Vycor glass which is quite similar to that of 4 He in Vycor glass.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen in porous Vycor glass

et al. 1996

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Hydrogen in porous Vycor glass ͑pore radius R p ϭ3.0 nm͒ has been investigated with a torsional oscillator technique at 7.5 K рTр 22 K. H 2 molecules which are adsorbed in Vycor at TϾT 3 (T 3 , triple point of bulk H 2 ) leave the Vycor when decreasing the temperature to below a characteristic value T c рT 3 ; T c depends on the amount of H 2 in the Vycor. This interpretation of the data is supported by simultaneous measurements of the H 2 vapor pressure. A similar phenomenon is observed with a capacitor filled with Vycor into which H 2 is condensed. We conclude that the free energy of solid H 2 in the Vycor is larger than that of bulk solid H 2 . Information on the free energy of H 2 confined in the Vycor is important to understand the depression of its freezing temperature in restricted geometries. We also discuss the properties of solids and the depression of their freezing temperature in restricted geometries.

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Triple-point wetting ofH2films adsorbed on silver

Cited by 34 publications

References 23 publications

Hydrogen and helium films as model systems of wetting

Hydrogen and helium films as model systems of wetting

Elastic low temperature anomalies of solid hydrogen crystallites

Hydrogen in porous Vycor glass

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