Thermodynamics of hydrophobic interaction between silica surfaces coated with octadecyltrichlorosilane

Li, Zuoli; Yoon, Roe‐Hoan

doi:10.1016/j.jcis.2012.08.078

Cited by 31 publications

(33 citation statements)

References 46 publications

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“…One such case is regarding the origin of the attractive hydrophobic interaction between two hydrophobic surfaces. This interaction that is inherently due to the hydrophobicity of the surfaces (“true hydrophobic force”) becomes detectable at distances on the order of 10–20 nm when using force measuring techniques. ,, Atomic force microscopy measurements between surfaces of various degrees of hydrophobicity (as estimated by their static contact angles) prepared by either silane or thiol chemistry, show that the strength and range of the attraction increase with the contact angle. , One mechanism that has been put forward to explain the origin of this attractive force is associated with changes in the ordering of water molecules between the two approaching surfaces. , The vibrational spectroscopy results presented above, alas, for a single interface, suggest on the contrary that the order of water molecules at a distance of just a few angstroms from the most hydrophobic surface (as judged by its receding contact angle) is not different from that in the bulk.…”

Section: Water At Hydrophobic Surfacesmentioning

confidence: 99%

Water at Interfaces

et al. 2016

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The interfaces of neat water and aqueous solutions play a prominent role in many technological processes and in the environment. Examples of aqueous interfaces are ultrathin water films that cover most hydrophilic surfaces under ambient relative humidities, the liquid/solid interface which drives many electrochemical reactions, and the liquid/vapor interface, which governs the uptake and release of trace gases by the oceans and cloud droplets. In this article we review some of the recent experimental and theoretical advances in our knowledge of the properties of aqueous interfaces and discuss open questions and gaps in our understanding.

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Section: Water At Hydrophobic Surfacesmentioning

confidence: 99%

Water at Interfaces

et al. 2016

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“…To prevent delamination of the film glass slides were first treated with n-octadecyltrichlorosilane (OTS), which promotes adherence of the polymers to the glass support. 49,50 The homogeneity of films cast on these supports enabled the effect of altering film thickness on photocatalytic performance to be investigated. Film thicknesses were measured using atomic force microscopy (AFM) for thin films and profilometry for thicker samples.…”

Section: Polymer Photocatalysts On Supportsmentioning

confidence: 99%

Side-chain tuning in conjugated polymer photocatalysts for improved hydrogen production from water

Woods

Hillman

Pearce

et al. 2020

Energy Environ. Sci.

118

147

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“…OTS binds to silica surfaces via the silane group and exhibits a terminal CH3 group at its free end. The structural-mechanical properties of OTS monolayers have been described in several reports 34,40,47,48 . For an OTS monolayer on SiO2, the WCA is ~110° 11,49 .…”

Section: (B) Adhesion Mapping Of Test Samples In Watermentioning

confidence: 99%

“…We utilize the hydrophobic attraction for analytical purposes, that is, to discern between hydrophilic and hydrophobic surface areas through adhesion force measurements (Figure b), notwithstanding some controversies ,− concerning the origin of the hydrophobic attraction. We have chosen water as a polar liquid to facilitate comparatively large adhesion forces between hydrophobic AFM tips and domains of epitaxial graphene with different degrees of hydrophobicity.…”

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Thickness-Dependent Hydrophobicity of Epitaxial Graphene

et al. 2015

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This article addresses the much debated question whether the degree of hydrophobicity of single-layer graphene (1LG) is different from that of double-layer graphene (2LG). Knowledge of the water affinity of graphene and its spatial variations is critically important as it can affect the graphene properties as well as the performance of graphene devices exposed to humidity. By employing chemical force microscopy with a probe rendered hydrophobic by functionalization with octadecyltrichlorosilane (OTS), the adhesion force between the probe and epitaxial graphene on SiC has been measured in deionized water. Owing to the hydrophobic attraction, a larger adhesion force was measured on 2LG Bernal-stacked domains of graphene surfaces, thus showing that 2LG is more hydrophobic than 1LG. Identification of 1LG and 2LG domains was achieved through Kelvin probe force microscopy and Raman spectral mapping. Approximate values of the adhesion force per OTS molecule have been calculated through contact area analysis. Furthermore, the contrast of friction force images measured in contact mode was reversed to the 1LG/2LG adhesion contrast, and its origin was discussed in terms of the likely water depletion over hydrophobic domains as well as deformation in the contact area between the atomic force microscope tip and 1LG.

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Thermodynamics of hydrophobic interaction between silica surfaces coated with octadecyltrichlorosilane

Cited by 31 publications

References 46 publications

Water at Interfaces

Water at Interfaces

Side-chain tuning in conjugated polymer photocatalysts for improved hydrogen production from water

Thickness-Dependent Hydrophobicity of Epitaxial Graphene

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