Nonwetting of liquid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>on Rb

Klier, Jürgen; Wyatt, A. F. G.

doi:10.1103/physrevb.65.212504

Cited by 10 publications

(7 citation statements)

References 17 publications

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“…Most of the existing data [40,42] are consistent with a picture in which wetting takes place via a peculiar hysteretic transition that extends to the lowest temperatures, as shown in Fig. 6 (see however [44]). Although there does not appear to be a wetting temperature, the wet state is achieved via a first order prewetting-like transition that ends in a critical point near T = 2 K. The superfluid transition extends from T λ at coexistence, but in contrast to cesium, joins the prewetting transition in a cusp at the critical point which is therefore a tricritical point.…”

Section: Interactions With Superfluiditysupporting

confidence: 79%

Wetting, Prewetting and Superfluidity

Taborek

2009

J Low Temp Phys

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Experiments on adsorption and wetting of quantum fluids ( 4 He and 3 He) on weakly binding alkali metal substrates are reviewed. Helium on weak substrates can undergo a variety of phase transitions including wetting, prewetting, layering, and liquid-vapor transitions. Another characteristic feature of weak substrates is the absence of an immobile quasi solid layer which is present on all conventional strong substrates. Both the absence of the immobile layer and the interaction with surface phase transitions can strongly affect superfluid onset. The Kosterlitz-Thouless superfluid transition can terminate in either a critical endpoint where it meets a first order structural transition or a tricritical point where it meets critical point such as the prewetting critical point or the 2D liquid-vapor critical point.

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Section: Interactions With Superfluiditysupporting

confidence: 79%

Wetting, Prewetting and Superfluidity

Taborek

2009

J Low Temp Phys

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“…8. The situation is not so clear for Rb surfaces, since although a number of experimental evidences 5,17 and at least one theoretical calculation 18 are consistent with a vanishing wetting temperature, a more recent experiment 19 indicates that pristine Rb is nonwetted by helium up to a temperature above 300 mK, in agreement with earlier predictions. 20,21 So far, theoretical work on wetting properties of helium relies almost exclusively on the description of structure and energetics of films, uniformly extended on the plane perpendicular to the substrate, in spite that all these systems, even on wetted substrates, are thermodynamically unstable for the lowest areal coverages and should then appear as collections of puddles or clusters upon the adsorbing surface.…”

Section: Wetting Phenomenamentioning

confidence: 57%

From nonwetting to prewetting: The asymptotic behavior of4Hedrops on alkali substrates

et al. 2003

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We investigate the spreading of 4 He droplets on alkali-metal surfaces at zero temperature, within the frame of finite range density-functional theory. The equilibrium configurations of several 4 He N clusters and their asymptotic trend with increasing particle number N, which can be traced to the wetting behavior of the quantum fluid, are examined for nanoscopic droplets. We discuss the size effects inferring that the asymptotic properties of large droplets correspond to those of the prewetting film.

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“…with high T w . [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Many other wetting transitions have been predicted, but not yet observed.…”

Section: Introductionmentioning

confidence: 99%

To Wet or Not to Wet: That Is the Question

Gatica

Cole

2009

J Low Temp Phys

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Wetting transitions have been predicted and observed to occur for various combinations of fluids and surfaces. This paper describes the origin of such transitions, for liquid films on solid surfaces, in terms of the gas-surface interaction potentials V(r), which depend on the specific adsorption system. The transitions of light inert gases and H 2 molecules on alkali metal surfaces have been explored extensively and are relatively well understood in terms of the least attractive adsorption interactions in nature. Much less thoroughly investigated are wetting transitions of Hg, H 2 O, heavy inert gases and other molecular films. The basic idea is that nonwetting occurs, for energetic reasons, if the adsorption potential's well-depth D is smaller than, or comparable to, the well-depth ε of the adsorbate-adsorbate mutual interaction. At the wetting temperature, T w , the transition to wetting occurs, for entropic reasons, when the liquid's surface tension is sufficiently small that the free energy cost in forming a thick film is sufficiently compensated by the fluidsurface interaction energy. Guidelines useful for exploring wetting transitions of other systems are analyzed, in terms of generic criteria involving the "simple model", which yields results in terms of gas-surface interaction parameters and thermodynamic properties of the bulk adsorbate.

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Nonwetting of liquid4Heon Rb

Cited by 10 publications

References 17 publications

Wetting, Prewetting and Superfluidity

Wetting, Prewetting and Superfluidity

From nonwetting to prewetting: The asymptotic behavior of4Hedrops on alkali substrates

To Wet or Not to Wet: That Is the Question

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