Modification of the Fluctuation Dynamics of Ultrathin Wetting Films

Clavaud, Cécile; Maza-Cuello, M.; Frétigny, Christian; Talini, Laurence; Bickel, Thomas

doi:10.1103/physrevlett.126.228004

Phys. Rev. Lett.

2021

DOI: 10.1103/physrevlett.126.228004

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Modification of the Fluctuation Dynamics of Ultrathin Wetting Films

Cécile Clavaud

M. Maza-Cuello

Christian Frétigny

et al.

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Cited by 6 publications

References 28 publications

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Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise

Chaltin,

Rosenthal,

Léonard

et al. 2024

Langmuir

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Numerous applications of nanoporous materials require their pores to be filled with liquids. In spite of its huge technological importance, the conditions for the wetting of nanometer-sized pores and its phenomenology are still poorly understood. We report on capillary rise experiments with water in carbon xerogels, with synchrotron small-angle scattering used to follow the process in situ at the nanometer scale. The data reveal a two-step wetting process whereby water permeates first into molecular-sized micropores, which is followed by the imbibition of larger mesopores. A Cassie−Baxter analysis shows that the presence of water in the micropores is central, as it turns the mesopores from being hydrophobic to hydrophilic. Based on the so-calculated contact angles, the mesopore wetting kinetics are found to be quantitatively described by a classical Washburn model. Modeling of the experimental water profile ahead of the Washburn front reveals strong surface barriers opposing water transfer from the mesopores to the micropores.

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Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise

Chaltin,

Rosenthal,

Léonard

et al. 2024

Langmuir

View full text Add to dashboard Cite

show abstract

Fluctuation-driven instability of nanoscale liquid films on chemically heterogeneous substrates

Zhao

Zhang

2023

Physics of Fluids

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The instability and dewetting of bounded liquid films at the nanoscale are shown to strongly depend on thermal fluctuations. In this work, this fluctuation-driven instability of films on a chemically heterogeneous substrate is investigated both by a stochastic lubrication equation (SLE), which models thermal fluctuations with white noise, and by molecular dynamics (MD). Linear instability analysis for the SLE, considering slip and intermolecular forces of the heterogeneous substrates, is employed to derive a spectrum of the thermal capillary waves and their corresponding interface roughness, which are then quantitatively confirmed by numerical solutions for the SLE and MD. The fluctuation-driven instability is found to be enhanced by the slip and intermolecular forces, with the latter becoming dominant toward the final rupture. Moreover, the results suggest that a heterogeneous substrate can be approximated as a homogeneous one with effective (averaged) slip lengths and Hamaker constants for the intermolecular forces. The gradients of the slip and intermolecular forces due to the heterogeneities are shown not to affect the instability significantly.

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Probing interfacial effects with thermocapillary flows

2022

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Modification of the Fluctuation Dynamics of Ultrathin Wetting Films

Cited by 6 publications

References 28 publications

Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise

Two-Step Wetting of Nanoporous Carbons: Small-Angle Scattering Analysis of Capillary Rise

Fluctuation-driven instability of nanoscale liquid films on chemically heterogeneous substrates

Probing interfacial effects with thermocapillary flows

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