How water wets and self-hydrophilizes nanopatterns of physisorbed hydrocarbons

Díaz, Diego; Nickel, Ole; Moraga, Nicolás; Catalan, Rodrigo; Retamal, María José; Zelada, Hugo; Cisternas, Marcelo A; Meißner, Robert H.; Huber, Patrick; Corrales, Tomás P.; Volkmann, U.G.

doi:10.1016/j.jcis.2021.07.121

Cited by 3 publications

(4 citation statements)

References 72 publications

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Section: Resultsmentioning

confidence: 99%

“…This observation also suggests that measurements of small contact angles are particularly challenging because of potential contamination of aqueous systems with surface-active molecules. 21,92,93 With increasing hydrophobicity (increasing θ), the surface adsorption coefficient K s rapidly increases (see Figure 7a and eq 13) and eventually exceeds K v . Thus, |Δθ| starts dramatically rising with the surface hydrophobicity.…”

Section: Resultsmentioning

confidence: 99%

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Tuning Contact Angles of Aqueous Droplets on Hydrophilic and Hydrophobic Surfaces by Surfactants

2022

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Adsorption of small amphiphilic molecules occurs in various biological and technological processes, sometimes desired while other times unwanted (e.g., contamination). Surface-active molecules preferentially bind to interfaces and affect their wetting properties. We use molecular dynamics simulations to study the adsorption of short-chained alcohols (simple surfactants) to the water–vapor interface and solid surfaces of various polarities. With a theoretical analysis, we derive an equation for the adsorption coefficient, which scales exponentially with the molecular surface area and the surface wetting coefficient and is in good agreement with the simulation results. We apply the outcomes to aqueous sessile droplets containing surfactants, where the competition of surfactant adsorptions to both interfaces alters the contact angle in a nontrivial way. The influence of surfactants is the strongest on very hydrophilic and hydrophobic surfaces, whereas droplets on moderately hydrophilic surfaces are less affected.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tuning Contact Angles of Aqueous Droplets on Hydrophilic and Hydrophobic Surfaces by Surfactants

2022

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Section: Wetting Theorymentioning

confidence: 99%

“…95 Yadav et al also found that the hydrophobicity increases with the increase in the fractal dimension, 96 and Volkmann et al experimentally and theoretically found that organic adsorption is related to the fractal dimension. 97 In addition, Wang et al summarized ve contact states of droplets on the microstructured surface based on classic wetting states and special wetting phenomena in nature: 98 the Wenzel state, the Cassie state, the 'Lotus' state with a high contact angle and low adhesion (Fig. 4i 1 ), the transitional state between Wenzel and Cassie (Fig.…”

Section: Development Of Wenzel and Cassie Theoriesmentioning

confidence: 99%

Advances in organic adsorption on hydrophilic hierarchical structures for bionic superhydrophobicity: from fundamentals to applications

Li,

Duan,

Shao

et al. 2024

J. Mater. Chem. A

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Deformation dynamics of nanopores upon water imbibition

Sanchez,

Dammann,

Gallardo

et al. 2024

Proc. Natl. Acad. Sci. U.S.A.

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Capillarity-driven transport in nanoporous solids is widespread in nature and crucial for modern liquid-infused engineering materials. During imbibition, curved menisci driven by high negative Laplace pressures exert an enormous contractile load on the porous matrix. Due to the challenge of simultaneously monitoring imbibition and deformation with high spatial resolution, the resulting coupling of solid elasticity to liquid capillarity has remained largely unexplored. Here, we study water imbibition in mesoporous silica using optical imaging, gravimetry, and high-resolution dilatometry. In contrast to an expected Laplace pressure-induced contraction, we find a square-root-of-time expansion and an additional abrupt length increase when the menisci reach the top surface. The final expansion is absent when we stop the imbibition front inside the porous medium in a dynamic imbibition-evaporation equilibrium, as is typical for transpiration-driven hydraulic transport in plants, especially in trees. These peculiar deformation behaviors are validated by single-nanopore molecular dynamics simulations and described by a continuum model that highlights the importance of expansive surface stresses at the pore walls (Bangham effect) and the buildup or release of contractile Laplace pressures as menisci collectively advance, arrest, or disappear. Our model suggests that these observations apply to any imbibition process in nanopores, regardless of the liquid/solid combination, and that the Laplace contribution upon imbibition is precisely half that of vapor sorption, due to the linear pressure drop associated with viscous flow. Thus, simple deformation measurements can be used to quantify surface stresses and Laplace pressures or transport in a wide variety of natural and artificial porous media.

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How water wets and self-hydrophilizes nanopatterns of physisorbed hydrocarbons

Cited by 3 publications

References 72 publications

Tuning Contact Angles of Aqueous Droplets on Hydrophilic and Hydrophobic Surfaces by Surfactants

Tuning Contact Angles of Aqueous Droplets on Hydrophilic and Hydrophobic Surfaces by Surfactants

Advances in organic adsorption on hydrophilic hierarchical structures for bionic superhydrophobicity: from fundamentals to applications

Deformation dynamics of nanopores upon water imbibition

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