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Reinelt, Dietmar; Klier, Jürgen; Leiderer, Paul

doi:10.1023/a:1022586402420

Cited by 13 publications

(20 citation statements)

References 8 publications

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“…In earlier measurements we checked on the chemical state and homogeneity of our Cs surfaces. However, we did not observe a correlation between variations in work function and pinning centres [22,23].…”

Section: Wetting Dynamics On Quench-condensed Cscontrasting

confidence: 92%

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Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Reinelt¹,

Iov²,

Leiderer³

et al. 2005

J. Phys.: Condens. Matter

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Liquid 4 He shows a dewetting phase on Cs and Rb at low temperatures. These are the only substrates which are not wetted by 4 He. On Cs the wetting temperature, T w , is about 2 K. Usually one observes a thick metastable helium film remaining on the Cs substrate when either the surface is cooled below T w (so starting from a wet film) or when bulk helium (in the form of a drop or an advancing film) is deposited on the Cs. The contact line of this film is generally very stable and so there is no dewetting. However, we have observed that spontaneous drying of helium on Cs can occur and that contact lines can recede for temperatures close to T w . This exceptional behaviour is analysed and the dependence of substrate roughness is discussed. Furthermore, we have studied the non-wetting 'thin-film' of liquid 4 He on Cs. Far away from coexistence this film grows as a two-dimensional (2D) gas until about one monolayer is obtained, then remains nearly constant for a certain range of chemical potential and, close to coexistence, rapidly forms a thicker 2D-liquid-like film as stable thermodynamical solution.

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Section: Wetting Dynamics On Quench-condensed Cscontrasting

confidence: 92%

“…Some Cs surfaces, however, showed exceptions to this rule: (a) we observed spontaneous drying with fixed CL and (b) dewetting by receding CL. In one earlier experiment we observed that the metastable 4 He film did suddenly disappear while cooling the Cs substrate far below T w [22]. Unfortunately, at this time, we could not resolve the dewetting process.…”

mentioning

confidence: 76%

Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Reinelt¹,

Iov²,

Leiderer³

et al. 2005

J. Phys.: Condens. Matter

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“…In the simple case of a liquid/vapor phase equilibrium in presence of a surface, the surface coverage changes from a thin coverage to a thick liquid film. Experimental observations of these transitions on various systems have been made over the last decade [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A particular goal of experimentalists has been to check the first order nature of the transition, to determine the prewetting line in the T -∆µ plane and to locate the prewetting critical point.…”

mentioning

confidence: 99%

“…The transition reversibility has not always been tested. When it has been looked for, hysteresis has been found quite systematically [7][8][9][10][11][13][14][15][16][17]. This hysteresis has received diverging interpretations.…”

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Prewetting transition on a weakly disordered substrate: Evidence for a creeping film dynamics

Müller¹,

Dupont‐Roc²

2001

Europhys. Lett.

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PACS. 68.10.Gw -Interface activity, spreading. PACS. 68.15.+e -Liquid thin films. PACS. 68.35.Rh -Phase transitions and critical phenomena.Abstract. -We present the first microscopic images of the prewetting transition of a liquid film on a solid surface. Pictures of the local coverage map of a helium film on a cesium metal surface are taken while the temperature is raised through the transition. The film edge is found to advance at constant temperature by successive avalanches in a creep motion with a macroscopic correlation length. The creep velocity varies strongly in a narrow temperature range. The retreat motion is obtained only at much lower temperature, conforming to the strong hysteresis observed for prewetting transition on a disordered surface. Prewetting transition on such disordered surfaces appears to give rise to dynamical phenomena similar to what is observed for domain wall motions in 2D magnets.Introduction. -Over the past twenty years, prewetting transition has attracted a lasting interest since its first consideration by Ebner, . Considering an equilibrium between two fluid phases, the prewetting transition on a surface is simply the continuation off coexistence of the wetting transition. The surface coverage corresponding to the wetted state is simply finite rather than infinite. Apart from very special matching conditions [4,5] for which critical wetting transition has indeed been observed [6], first order transitions are expected, resulting from long range Van der Waals forces between the surface and the various fluid components [2][3][4]. In the simple case of a liquid/vapor phase equilibrium in presence of a surface, the surface coverage changes from a thin coverage to a thick liquid film. Experimental observations of these transitions on various systems have been made over the last decade [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. A particular goal of experimentalists has been to check the first order nature of the transition, to determine the prewetting line in the T -∆µ plane and to locate the prewetting critical point. As a matter of fact, experiments have raised further questions about hysteresis phenomena, about the consequences of surface disorder, about the nucleation of the new phase at the transition and its subsequent growth. Presently there is no unique interpretation of the various experimental observations of prewetting transitions, especially at low temperatures. To our best knowledge, nobody has ever provided a clear

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Dimple‐assisted dewetting: heterogeneous nucleation in undercooled wetting films

Blossey

2001

Annalen der Physik

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Undercooled wetting films near a first‐order wetting transition exhibit an unusually long lifetime: the thermal nucleation barrier for formation of a critical hole in a film of thickness F diverges according to Γ ∼ exp (ℰc/kBT) where the excess free energy ℰc ∼ Fζ with ζ ≥ 2. Localized perturbations of the liquid‐vapor interface (‘dimples’) are shown to be a useful tool in reducing Γ in a controlled way: they act as heterogeneous nucleation centers for thermal critical nuclei. For 4He wetting films on weak‐binding alkali substrates (Cs, Rb) dimples can be generated either by vortices in a superfluid film or by surface electrons. The theory of the heterogeneous nucleation process initiated by the presence of surface dimples (‘dimple‐assisted dewetting’) is developed, accompanied by quantitative predictions for experiment.

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Abstract: Cesium is a surface not wetted by liquid

Cited by 13 publications

References 8 publications

Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Prewetting transition on a weakly disordered substrate: Evidence for a creeping film dynamics

Dimple‐assisted dewetting: heterogeneous nucleation in undercooled wetting films

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Untitled

Abstract: Cesium is a surface not wetted by liquid

Cited by 13 publications

References 8 publications

Liquid4He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Liquid4He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Prewetting transition on a weakly disordered substrate: Evidence for a creeping film dynamics

Dimple‐assisted dewetting: heterogeneous nucleation in undercooled wetting films

Contact Info

Product

Resources

About

Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’

Liquid⁴He on Cs: drying, depinning, and the non-wetting ‘thin-film’