Hydrophobic Interactions between Dissimilar Surfaces

Yoon, Roe‐Hoan; Flinn, Darrin Heinz; Rabinovich, Ya. I.

doi:10.1006/jcis.1996.4583

Cited by 287 publications

(240 citation statements)

References 16 publications

(31 reference statements)

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“…Our derived laws for the cavitation transition and the dry adhesion transition both depend on the sum of the contact angles of the two surfaces, in good agreement with explicit simulation results for not too asymmetric surfaces. This means that the regime of dry adhesion without cavitation in the adhesion state diagram spanned by the two surface contact angles forms a strip between the hydration repulsion and cavitation regimes, in good agreement with a host of experimental findings for different systems (2,3,(22)(23)(24)(25)(26). Our theoretical analysis shows that this dry adhesion regime necessarily exists and that it becomes more pronounced the stronger the direct surface-surface interactions are.…”

Section: Discussionsupporting

confidence: 87%

“…This combination rule was earlier established based on experimental data (22) and is validated in SI Text, using our simulation results. Combining Eqs.…”

Section: Dry Adhesion Transition Between Dissimilar Surfacesmentioning

confidence: 72%

“…Most practical situations involve two dissimilar surfaces, for example nanoparticles interacting with cell membranes (20) or weak protein-protein interactions (21). In fact, a number of experimental model studies addressed the interactions between dissimilar surfaces and the particularly interesting case of hydrophobic-hydrophilic surfaces (2,3,(22)(23)(24)(25)(26). The results are rather multifaceted and cannot be easily cast in a unified picture, yet, in one study an empirical sum rule for the interaction strength between two dissimilar surfaces in terms of the two surface contact angles was established (22).…”

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confidence: 99%

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From hydration repulsion to dry adhesion between asymmetric hydrophilic and hydrophobic surfaces

Kanduč

Netz

2015

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

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Using all-atom molecular dynamics (MD) simulations at constant water chemical potential in combination with basic theoretical arguments, we study hydration-induced interactions between two overall chargeneutral yet polar planar surfaces with different wetting properties. Whether the water film between the two surfaces becomes unstable below a threshold separation and cavitation gives rise to long-range attraction, depends on the sum of the two individual surface contact angles. Consequently, cavitation-induced attraction also occurs for a mildly hydrophilic surface interacting with a very hydrophobic surface. If both surfaces are very hydrophilic, hydration repulsion dominates at small separations and direct attractive force contribution can-if strong enough-give rise to wet adhesion in this case. In between the regimes of cavitation-induced attraction and hydration repulsion we find a narrow range of contact angle combinations where the surfaces adhere at contact in the absence of cavitation. This dry adhesion regime is driven by direct surface-surface interactions. We derive simple laws for the cavitation transition as well as for the transition between hydration repulsion and dry adhesion, which favorably compare with simulation results in a generic adhesion state diagram as a function of the two surface contact angles.A ccording to the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, the interaction between hydrated surfaces is given by the sum of van der Waals (vdW) and screened electrostatic interactions (1). Although this approach works well in many situations, subnanometer resolved force measurements between individual surfaces demonstrated that additional watermediated interactions are dominant at small separations and depend crucially on the polarity or wetting properties of the surfaces (2-4). Understanding these solvation-induced interactions is still a central issue in all fields concerned with forces between surfaces, colloids, and macromolecular aggregates in water.As is well known, the water film between two hydrophobic surfaces, characterized by water contact angles θ > 90°, becomes freeenergetically unstable below a critical distance and in equilibrium cavitation leads to vapor bubble-induced long-ranged attraction (5-7). Conversely, polar and overall neutral surfaces, characterized by small or vanishing contact angles, exhibit pronounced shortranged repulsive forces, which decay exponentially with a characteristic length in the subnanometer range (8-11). These so-called hydration forces arise from the complex interplay of surface group configurational degrees of freedom, desorption of hydration water from polar surface groups, and ordering of the intersurface water film (4). The understanding of hydration forces has recently been advanced by computer simulations that include explicit water molecules (12)(13)(14).In the absence of direct surface-surface interactions, the transition between cavitation-induced attraction and hydration repulsion should coincide with the contact angle char...

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Section: Discussionsupporting

confidence: 87%

“…This combination rule was earlier established based on experimental data (22) and is validated in SI Text, using our simulation results. Combining Eqs.…”

Section: Dry Adhesion Transition Between Dissimilar Surfacesmentioning

confidence: 72%

mentioning

confidence: 99%

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From hydration repulsion to dry adhesion between asymmetric hydrophilic and hydrophobic surfaces

Kanduč

Netz

2015

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

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“…It is observed between surfaces with contact angles around or higher than 908. For one hydrophobic and one hydrophilic surface no long-range attraction is observed [355,496]. The first direct evidence that the interaction between solid hydrophobic surfaces is stronger than the van der Waals attraction was provided by Israelachvili and Pashley [497,498].…”

Section: Hydrophobic Attractionmentioning

confidence: 99%

“…However, routine force measurements with differently prepared hydrophobic surfaces became possible only with the AFM [504]. These include: silica, oxidized silicon wafers, and glass surfaces treated with octadecyl-trichloro-silane (OTS, CH 3 (CH 2 ) 17 SiCl 3 ) [355,496,505,506], trimethyl-chlorosilane [505,507], dichloro-dimethyl-silane [508], in fluorinated dichlorosilane [509], and hexamethyl-disilazane [180]; hydrophobic polymer surfaces such as polystyrene [189,510], polypropylene [511], polyethylene [512]; gold-alkanethiol coated surfaces [513]; silica, oxidized silicon wafers, and glass surfaces with physisorbed CTAB [514,515].…”

Section: Hydrophobic Attractionmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,193

2,949

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Bioinspired Superwettability Materials

Xiao

Wen

Jiang

2016

Kirk-Othmer Encyclopedia of Chemical Technology

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Naturally occurring structures such as spider silks, cactus spine, dandelion pappi, lotus leaves, butterfly wings, rose petals, gecko feet, and desert beetles possess unique properties and outstanding wettability characteristics, which are not yet well understood, but may provide inspiration for construction of superwettability materials. The focus of this article is on recent progress in application of bioinspired superwettability materials for diverse uses ranging from nanofibers, self‐cleaning materials, and chemical reaction interfaces to oil–water separation, patterning, and printing. The article begins by introducing one‐ and two‐dimensional naturally occurring structures with superwettability properties. Then, the fundamental principles of superwetting materials are discussed, followed by classification of superwettability materials based on the medium. The article discusses in detail the recent progress in application of bioinspired materials and provides a short conclusion and perspective.

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Hydrophobic Interactions between Dissimilar Surfaces

Cited by 287 publications

References 16 publications

From hydration repulsion to dry adhesion between asymmetric hydrophilic and hydrophobic surfaces

From hydration repulsion to dry adhesion between asymmetric hydrophilic and hydrophobic surfaces

Force measurements with the atomic force microscope: Technique, interpretation and applications

Bioinspired Superwettability Materials

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