Direct measurement of the contact angle of water droplet on quartz in a reservoir rock with atomic force microscopy

“…Surface with 166° contact angle has strong Q peaks. The contact angle of Q was stated as maximum 50° in literature [29]. Therefore the superhydrophobicity of the surfaces is directly related to β phase.…”

Section: Surface Propertiesmentioning

confidence: 99%

The effect of sintering regime on superhydrophobicity of silicon nitride modified ceramic surfaces

Açıkbaş

2021

Journal of Asian Ceramic Societies

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The most common method of obtaining a superhydrophobic surface is to create a specific surface morphology and then coat it with a hydrophobic polymer. Numerous such morphological surfaces have been developed but are often fragile. Ceramic-based coatings show longer life with high wear resistance. In this study, surface micro-nano surface morphology was developed with β-Si 3 N 4 powder and the influence of sintering regime on contact angle of ceramic surfaces was investigated. The contact angle, surface energy and surface roughness were determined from the developed surfaces and surface morphology analyzed by scanning electron microscopy, phase evolution was determined by X-Ray diffraction. Changes in sintering regimes lead to different phase evolutions, roughness, surface topography, surface free energies and contact angles. The superhydrophobicity resulted mainly due to the surface structure/topography in the micro-nano hybrid structures of β-Si 3 N 4 crystals. The highest water contact angle achieved was 166º of the samples sintered at 980°C for 5 min.

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“…Herein, using MD simulations we probed the perturbation of aqueous water structure in close proximity to model hydrophobic and hydrophilic quartz interfaces. Our interest in quartz-aqueous water interfaces stemmed from their ubiquitousness in nature and recent studies on quartz from structural, [29][30][31] wettability, 32,33 and theoretical 17,[34][35][36][37][38][39][40] perspectives.…”

Section: Introductionmentioning

confidence: 99%

The Attraction of Water for Itself at Hydrophobic Quartz Interfaces

et al. 2020

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Structural forces within aqueous water at a solid interface can significantly change surface reactivity and the affinity of solutes towards it. We show by molecular dynamics simulation how hydrophilic and hydrophobic quartz surfaces perturb the orientational structure of aqueous water, ultimately strengthening dipolar forces between molecules in proximity to the interface. When derived as a function of distance from each surface, it was found that both surfaces indirectly enhance the long-range dipolar attraction of water for itself towards the interfacial region. This was found to be longer-ranged for water molecules solvating the hydrophobic surface than those solvating the hydrophilic surface, with a range of up to 2.5 nm from the hydrophobic surface. Our results give direct quantification of surface-induced changes in solvent-solvent attraction, ultimately providing a counterintuitive addition to the balance of hydrophobic forces at aqueoussolid interfaces.

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Direct measurement of the contact angle of water droplet on quartz in a reservoir rock with atomic force microscopy

Cited by 72 publications

References 72 publications

The contact angle of water on feldspar in a reservoir rock

The contact angle of water on feldspar in a reservoir rock

The effect of sintering regime on superhydrophobicity of silicon nitride modified ceramic surfaces

The Attraction of Water for Itself at Hydrophobic Quartz Interfaces

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