Continuous and first-order wetting transition from the van der Waals theory of fluids

Hauge, E. H.; Schick, M.

doi:10.1103/physrevb.27.4288

Cited by 125 publications

(69 citation statements)

References 18 publications

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“…Focusing on the region near coexistence ͑not shown͒, it appears that the prewetting lines approach the coexistence line tangentially, as should be expected. 20 It is seen that the prewetting lines will disappear if both AC ϭ BC and AB are sufficiently low, namely, for AC ϭ BC Ϸ4/N and AB Ϸ8/N. This combination of -values marks the tricritical point, at which the wetting transitions change from first order to second order.…”

Section: A First Regime: Additional To Cahnmentioning

confidence: 99%

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Wetting transitions in symmetrical polymer blends

Engels

Leermakers

2001

The Journal of Chemical Physics

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The characteristics of wetting in polymer blends are investigated by a self-consistent-field theory. A symmetrical system is chosen: the interface between two homopolymeric liquids A and B is wetted by a third homopolymer C which is equally insoluble in both liquids. All components have the same molecular weight (N A ϭN B ϭN C ϭNϭ10 or 100). The emphasis of this study is on the wetting transitions induced by varying the interactions between the components. Cahn's argument, which predicts complete wetting near the critical temperature of two system components, is verified in this context. We show that it is necessary to consider the effective interaction parameters AC eff ϭ BC eff to verify Cahn's argument. Since we vary the solubility of C ͑given by AC ϭ BC ) and the thickness of the AB interface ͑determined by AB ) independently, we have a two-dimensional parameter space. In this parameter space we can distinguish three regimes representing wetting transitions with different characteristics. One of these regimes indeed shows Cahn-type transitions. A key observation is that the wetting transitions near the simultaneous critical point of mixtures A/C and B/C are of a second-order type. A second regime in the parameter space represents wetting transitions which are understood from the high surface tension of the AB interface. In many cases these wetting transitions are also of a second-order type, but become first order when N AB Ͼ8. In the third regime we find what might be called ''pseudowetting:'' from inspection of the adsorption isotherms it follows that C seems to wet the AB interface, but with increasing amount of C in the system, the wetting layer is suddenly destroyed. The reason for this is clear. Here, the apparent wetting point AC wet is close to AC eff,crit , but AB Ͻ AC ϭ BC , the wetting film is unstable. As a result, while at first Cahn's argument seems to be fulfilled, it eventually fails in this region of the parameter space.

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Section: A First Regime: Additional To Cahnmentioning

confidence: 99%

“…Usually, the temperature T or TϪT crit is used as control parameter instead of . Since ϰ1/T, the relative positions of wetting point, critical prewetting point, and critical point are reversed with respect to standard wetting phase diagrams, 9,20 where T wet ϽT cpr ϽT crit . In Fig.…”

Section: A First Regime: Additional To Cahnmentioning

confidence: 99%

Wetting transitions in symmetrical polymer blends

Engels

Leermakers

2001

The Journal of Chemical Physics

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“…Note that these pre-wetting lines lay in the gas region of the bulk phase diagram (∆µ < 0), and approach bulk coexistence tangentially at the respective T (i) w , i = w, s. As expected, the deeper well of the fluid-stripe LJ interaction leads to T (s) w < T (w) w , and a more pronounced prewetting line µ (s) pw (T ), which extends deeper into the gas region. Near the respective wetting temperatures T (i) w , the pre-wetting lines are described by their asymptotic behaviour, which follows from analysis of the Clausius-Clapeyron equation [5,34,41]:…”

Section: Wetting Phenomenologymentioning

confidence: 99%

Classical density functional study of wetting transitions on nanopatterned surfaces

Yatsyshin

Parry

Rascón

et al. 2017

J. Phys.: Condens. Matter

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Abstract.Even simple fluids on simple substrates can exhibit very rich surface phase behaviour. To illustrate this, we consider fluid adsorption on a planar wall chemically patterned with a deep stripe of a different material. In this system, two phase transitions compete: unbending and pre-wetting. Using microscopic density-functional theory, we show that, for thin stripes, the lines of these two phase transitions may merge, leading to a new two-dimensional-like wetting transition occurring along the walls. The influence of intermolecular forces and interfacial fluctuations on this phase transition and at complete pre-wetting are considered in detail.

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“…• Any first-order phase boundary corresponding to a line of coexistence in the T − µ plane satisfies a Clausius-Clapeyron-like equation [26]:…”

Section: A General Considerationsmentioning

confidence: 99%

Surface phase diagrams for wetting on heterogenous substrates

Rascón

Parry

2001

The Journal of Chemical Physics

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We propose a simplified description of fluid adsorption on heterogenenous micropatterned substrates. Using this approach, we are able to rederive results obtained earlier using effective interfacial Hamiltonian methods and predict a number of new examples of surface phase behaviour for both singly and periodically striped substrates. In particular, we show that, for a singly striped system, the manner in which the locus of surface unbending phase transitions approaches the pre-wetting line of the infinite pure system, in the limit of large stripe widths, is non-trivial and sensitive to several characteristic lengthscales and competing free-energies. For periodic substrates, we investigate finite-size deviations from Cassie's law for the wetting temperature of the heterogeneous system when the domain sizes are mesoscopic.

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Continuous and first-order wetting transition from the van der Waals theory of fluids

Cited by 125 publications

References 18 publications

Wetting transitions in symmetrical polymer blends

Wetting transitions in symmetrical polymer blends

Classical density functional study of wetting transitions on nanopatterned surfaces

Surface phase diagrams for wetting on heterogenous substrates

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