The order of condensation in capillary grooves

Rascón, C.; Parry, A. O.; Nürnberg, Robert; Pozzato, Alessandro; Tormen, Massimo; Bruschi, L.; Mistura, Giampaolo

doi:10.1088/0953-8984/25/19/192101

Cited by 20 publications

(48 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The predicted asymptote (29), shown as the dashed line, is in very good agreement with our numerical computations. The divergence of Γ pln (µ) means that the prewetting transition occurring at µ In what follows, we consider two more examples of this transition occurring in different geometries.…”

Section: Heterogeneous Planar Wallsupporting

confidence: 85%

“…The possibility of such transitions was speculated upon first by Hauge in his treatment of wedge wetting [41], and later independently by Saam for a substrate with a step [42]. In the present work we study these transitions for the first time using microscopic density functional theory, and show that they may also occur in a capillary groove, where continuous prewetting competes with continuous capillary-condensation [17,29].…”

mentioning

confidence: 56%

See 1 more Smart Citation

Complete prewetting

Yatsyshin¹,

Parry²,

Kalliadasis³

2016

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Abstract. We study continuous interfacial transitions, analagous to two-dimensional complete wetting, associated with the first-order prewetting line, which can occur on steps, patterned walls, grooves and wedges, and which are sensitive to both the range of the intermolecular forces and interfacial fluctuation effects. These transitions compete with wetting, filling and condensation producing very rich phase diagrams even for relatively simple prototypical geometries. Using microscopic classical density functional theory to model systems with realistic Lennard-Jones fluid-fluid and fluidsubstrate intermolecular potentials, we compute mean-field fluid density profiles, adsorption isotherms and phase diagrams for a variety of confining geometries.

show abstract

Section: Heterogeneous Planar Wallsupporting

confidence: 85%

mentioning

confidence: 56%

Complete prewetting

Yatsyshin¹,

Parry²,

Kalliadasis³

2016

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…Such phenomenology of capped capillaries is clearly analogous to wetting of planar walls. A recent study by Rascon et al 22 has explored the effect of the wetting properties of the capping wall on the order of condensation at T cw . Using an effective Hamiltonian approach, the authors have revealed that T cw is related to the Young contact angle of the capping wall considered on its own.…”

Section: -2mentioning

confidence: 99%

“…For example, the adsorption of capillary liquid slab on the capping wall of the capillary and the adsorption of liquid film on an infinite planar wall are related phenomena. 22 What is then the effect of the pore width? To what extent can one consider the value of T w to be an approximation to T cw ?…”

Section: -2mentioning

confidence: 99%

Wetting of prototypical one- and two-dimensional systems: Thermodynamics and density functional theory

Yatsyshin

Savva

Kalliadasis

2015

The Journal of Chemical Physics

View full text Add to dashboard Cite

Consider a two-dimensional capped capillary pore formed by capping two parallel planar walls with a third wall orthogonal to the two planar walls. This system reduces to a slit pore sufficiently far from the capping wall and to a single planar wall when the side walls are far apart. Not surprisingly, wetting of capped capillaries is related to wetting of slit pores and planar walls. For example, the wetting temperature of the capped capillary provides the boundary between first-order and continuous transitions to condensation. We present a numerical investigation of adsorption in capped capillaries of mesoscopic widths based on density functional theory. The fluid-fluid and fluid-substrate interactions are given by the pairwise Lennard-Jones potential. We also perform a parametric study of wetting in capped capillaries by a liquid phase by varying the applied chemical potential, temperature, and pore width. This allows us to construct surface phase diagrams and investigate the complicated interplay of wetting mechanisms specific to each system, in particular, the dependence of capillary wetting temperature on the pore width. C 2015 AIP Publishing LLC. [http://dx

show abstract

“…As already mentioned, our present study neglects the fluctuations of the fluid density along the z-axis, because such an investigation requires a non-classical approach such as, e.g., that used in [24], and is beyond what DFT can offer at the moment. The capillary wave-like fluctuations of the interfaces along the z-axis are likely to affect the transitions discussed here, especially near their respective critical points.…”

Section: Discussionmentioning

confidence: 99%

Density functional study of condensation in capped capillaries

Yatsyshin

Savva

Kalliadasis

2015

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Abstract. We study liquid adsorption in narrow rectangular capped capillaries formed by capping two parallel planar walls (a slit pore) with a third wall orthogonal to the two planar walls. The most important transition in confined fluids is arguably condensation, where the pore becomes filled with the liquid phase which is metastable in the bulk. Depending on the temperature T , the condensation in capped capillaries can be first-order (at T ≤ T cw ) or continuous (at T > T cw ), where T cw is the capillary wetting temperature. At T > T cw , the capping wall can adsorb mesoscopic amounts of metastable under-condensed liquid. The onset of condensation is then manifested by the continuous unbinding of the interface between the liquid adsorbed on the capping wall and the gas filling the rest of the capillary volume. In wide capped capillaries there may be a remnant of wedge filling transition, which is manifested by the adsorption of liquid drops in the corners. Our classical statistical mechanical treatment predicts a possibility of three-phase coexistence between gas, corner drops and liquid slabs adsorbed on the capping wall. In sufficiently wide capillaries we find that thick prewetting films of finite length may be nucleated at the capping wall below the boundary of the prewetting transition. Prewetting then proceeds in a continuous manner manifested by the unbinding interface between the thick and thin films adsorbed on the side walls. Our analysis is based on a detailed numerical investigation of the density functional theory for the fluid equilibria for a number of illustrative case studies.

show abstract

The order of condensation in capillary grooves

Cited by 20 publications

References 39 publications

Complete prewetting

Complete prewetting

Wetting of prototypical one- and two-dimensional systems: Thermodynamics and density functional theory

Density functional study of condensation in capped capillaries

Contact Info

Product

Resources

About