Prewetting of Liquid Hydrogen on Rough Cesium Substrates

Rolley, E.; Guthmann, C.; Pettersen, M. S.

doi:10.1103/physrevlett.103.016101

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Similarly, Rull et al also observed first-order transition for a liquid crystal near the attractive surface between a disordered film and nematic-like film without any hints of prewetting transition. Along with theoretical and simulation study of fluid behavior near modified/functionalized surfaces, extensive studies have been performed experimentally to understand the surface morphology effect on the surface phase transtion. − A recent review of Taborek summarizes experimental observations of adsorption behavior of quantum fluids on weakly binding alkali metal substrate and discussed surface phase transitions including prewetting and 2D vapor liquid transitions.…”

Section: Introductionmentioning

confidence: 99%

Surface Phase Transition of Associating Fluids on Functionalized Surfaces

Khan

Singh

2011

J. Phys. Chem. C

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Surface phase transitions are studied for Lennard-Jones (LJ) based dimer forming associating fluids on modified surfaces with active sites for various association strengths using grand-canonical transition matrix Monte Carlo. We examine adsorption isotherm, density, energy, and monomer profiles to differentiate layering, quasi-2D vapor–liquid and prewetting transitions. Prewetting transition is found for association strengths: εaf = 8 and 10, whereas, for weaker associating fluids, εaf = 4 and 6, we observe quasi-2D vapor–liquid transition. The growth of thick films in the case of quasi-2D vapor liquid transitions is found to suppress with decrease in temperature and eventually splits in layering transitions. For systems exhibiting prewetting transition, wetting temperature and prewetting critical temperature increase with increasing association strength. In addition, we examine boundary tension of quasi-2D and prewetting transitions using finite size scaling formalism of Binder. Our results indicate that the quasi-2D boundary tension is lower than that of the prewetting transition. Surface sites are found to reduce the boundary tension; however, the effect of active sites diminishes with stronger fluid–fluid associating strength.

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Section: Introductionmentioning

confidence: 99%

Surface Phase Transition of Associating Fluids on Functionalized Surfaces

Khan

Singh

2011

J. Phys. Chem. C

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“…The real nature of the thermally activated steps controlling contact line motion remains uncertain. Indeed, while some studies involving simple fluids partially wetting smooth surfaces report displacement lengths λ in good agreement with the proposition of molecular adsorption–desorption processes (λ below 1 nm), ,− others found larger λ values, contradicting the single molecule jump hypothesis. − Rolley and Guthmann were the first to explain the large value of λ (∼10 nm), found in their innovative work with liquid helium wetting a substrate with nanoscopic defects . They suggested that the mechanism governing contact line motion was a thermally activated pinning and depinning process .…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 96%

Contact Line Motion on Nanorough Surfaces: A Thermally Activated Process

et al. 2013

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The motion of a solid-liquid-liquid contact line over nanorough surfaces is investigated. The surface nanodefects are varied in size, density, and shape. The dynamics of the three-phase contact line on all nanorough substrates studied is thermally activated. However, unlike the motion of a liquid-vapor interface over smooth surfaces, this thermally activated process is not adequately described by the molecular kinetic theory. The molecular parameters extracted from the experiments suggest that on the nanorough surfaces, the motion of the contact line is unlikely to simply consist of molecular adsorption-desorption steps. Thermally activated pinning-depinning events on the surface nanodefects are also important. We investigate the effect of surface nanotopography on the relative importance of these two mechanisms in governing contact line motion. Using a derivation for the hysteresis energy based on Joanny and de Gennes's model, we evaluate the effect of nanotopographical features on the wetting activation free energy and contact line friction. Our results suggest that both solid-liquid interactions and surface pinning strength contribute to the energy barriers hindering the three-phase contact line motion. For relatively low nanodefect densities, the activation free energy of wetting can be expressed as a sum of surface wettability and surface topography contributions, thus providing a direct link between contact line dynamics and roughness parameters.

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“…The slow adsorption rates observed for diverse microparticles were attributed to thermally activated processes induced by surface defects with sizes ranging from 1 to 5 nm [32]. Studies of the spreading dynamics of low viscosity liquids on surfaces with defect sizes of 10 nm report that the contact line displacement is governed by thermally activated processes [19,20,[36][37][38]. These studies [37,38] indicate that energy barriers prescribing the displacement rate of the contact line are significantly smaller than the work of adhesion, and thus energy barriers ∆E γs 2 d induced by mesoscopic defects are smaller than predicted from the defect size.…”

Section: Introductionmentioning

confidence: 99%

Crossover from shear-driven to thermally activated drainage of liquid-infused microscale capillaries

et al. 2016

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The shear-driven drainage of capillary grooves filled with viscous liquid is a dynamic wetting phenomenon relevant to numerous industrial processes and novel lubricant-infused surfaces. Prior work has reported that a finite length L∞ of the capillary groove can remain indefinitely filled with liquid even when large shear stresses are applied. The mechanism preventing full drainage is attributed to a balance between the shear-driven flow and a counterflow driven by capillary pressures caused by deformation of the free surface. In this work, we examine closely the approach to the final equilibrium length L∞ and report a crossover to a slow drainage regime that cannot be described by conventional dynamic models considering solely hydrodynamic and capillary forces. The slow drainage regime observed in experiments can be instead modeled by a kinetic equation describing a sequence of random thermally activated transitions between multiple metastable states caused by surface defects with nanoscale dimensions. Our findings provide new insights on the critical role that natural or engineered surface roughness with nanoscale dimensions can play in the imbibition and drainage of capillaries and other dynamic wetting processes in microscale systems.

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Prewetting of Liquid Hydrogen on Rough Cesium Substrates

Cited by 5 publications

References 28 publications

Surface Phase Transition of Associating Fluids on Functionalized Surfaces

Surface Phase Transition of Associating Fluids on Functionalized Surfaces

Contact Line Motion on Nanorough Surfaces: A Thermally Activated Process

Crossover from shear-driven to thermally activated drainage of liquid-infused microscale capillaries

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