Interfacial segregation and the wetting transition in fluid metal-salt systems

Juchem, R; Müller, S.C.; Nattland, D.; Freyland, W.

doi:10.1088/0953-8984/2/s/068

Cited by 10 publications

(2 citation statements)

References 6 publications

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“…In M-MX melts the wetting transition is obviously linked with the existence of a bulk liquid-liquid miscibility gap; in mixtures like Cs-Csl, where the miscibility gap is suppressed, no indications of a wetting transition have been observed. 95 In the Ga-based alloys considered here tetrapoint wetting is the rule resulting in low wetting temperatures T W along the metastable extension of the coexistence curve. The lower surface free energy wetting phases are the Bior Pb-rich liquids.…”

Section: Conclusion and Perspectivementioning

confidence: 95%

Interfacial phase transitions in conducting fluids

Freyland

2008

Phys. Chem. Chem. Phys.

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We present a review, largely based on recent experimental work of our group, on phase transitions at interfaces of fluid metals, alloys and ionic liquids. After a brief analysis of possible experimental errors and limitations of surface sensitive methods, we first deal with first-order wetting transitions at the liquid/vapour and liquid/wall interface in systems such as Ga-based alloys, K-KCl melts, and fluid Hg. The following chapter refers to surface freezing or surface induced crystallization in different metal alloys. The respective surface phase diagrams are discussed in comparison with their bulk counterpart. In the last part we present very recent investigations of ionic liquid interfaces, including order-disorder transitions at the liquid/vapour interface and examples of two-dimensional phase transitions at the electrified ionic liquid/metal interface. Finally, a simple electrowetting experiment with an ionic liquid droplet under vacuum is described which gives new insight into the contact angle saturation problem. The article ends up with a few perspective remarks on open problems and potential impact of interfacial phenomena on applied research.

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Section: Conclusion and Perspectivementioning

confidence: 95%

Interfacial phase transitions in conducting fluids

Freyland

2008

Phys. Chem. Chem. Phys.

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“…This is rather surprising as alloys and their interfacial properties and wetting behaviour are of some technical importance. First experiments within the homogeneous series of the alkali metal-alkali halide systems have been reported: they show a growing trend of the fluid metals to be wetted by a salt-rich layer on going from the heavier (Cs-CsCl) to the lighter (Na-NaCl) systems [5,6]. This trend is accompanied by a strong increase of the width of the miscibility gap in these systems [7] which reflects the sensitivity of thermodynamic behaviour to the gradual change of the intermolecular interactions in this series.…”

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confidence: 99%

Interfacial wetting in a liquid binary alloy

Nattland¹,

Poh²,

Müller³

et al. 1995

J. Phys.: Condens. Matter

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We report the first study of interfacial wetting at the liquid-vapour surface of metallic gallium-bismuth alloys approaching the miscibility gap. Ellipsometry has been used to probe the interface continuously with increasing temperature along the coexistence curve. Below the monotectic (eutectic) temperature Tmono a liquid Ga-rich phase is in equilibrium with solid bismuth and the real part epsilon 1 of the complex dielectric function measured at the liquid surface clearly reflects Ga-like behaviour. Above Tmono the second liquid Bi-rich phase becomes stable and epsilon 1 changes from Ga-like to Bi-like behaviour. We conclude that the Bi-rich phase, which has the higher mass density, now covers the low-density phase. This can be consistently interpreted as complete wetting of the interface between the vapour and the Ga-rich phase by a coexisting Bi-rich layer.

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Interfacial segregation and wetting transition in fluid binary metallic mixtures

Müller

Tostmann

Nattland

et al. 1994

Ber Bunsenges Phys Chem

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First indications of wetting transitions in alkalimetal‐alkalihalide solutions have been obtained in previous optical studies. In order to study this transition continuously as a function of temperature and composition along the coexisting curve and in the homogeneous phase we have started SHG‐measurements on these systems at the fluid‐sapphire interface. First results of this experiment in comparison with the ellipsometric results will be presented. On the other hand, in order to exclude influences of the substrate on the interfacial behaviour we have investigated the liquid‐vapour interface in the liquid alloy Ga‐Bi (metallic system with miscibility gap) by spectroscopic ellipsometry. The main interest concentrates on possible discontinuous changes of the optical constants at the interface with varying composition and temperature. First results are presented.

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Interfacial segregation and the wetting transition in fluid metal-salt systems

Cited by 10 publications

References 6 publications

Interfacial phase transitions in conducting fluids

Interfacial phase transitions in conducting fluids

Interfacial wetting in a liquid binary alloy

Interfacial segregation and wetting transition in fluid binary metallic mixtures

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