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Showing 1 to 10 of 10 for “"wetting film"”.
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Hydrophobic Forces in Wetting Films
… adhesion is possible only when the thin film of water between the bubble and particle ruptures, just like when two colloidal particles or air bubbles adhere with each other. Under most flotation conditions, however, both the double-layer and dispersion forces are repulsive, which makes it …
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Fluctuations, Phase Separation and Wetting Films near Liquid-Gas Critical Point
… board of Mir space station studied boiling and wetting film dynamics during evaporation near the critical point of two pure fluids (sulfur hexafluoride and carbon dioxide) using a defocused grid method. The specially designed cell containing the pure fluid was heated and, as a result, a low …
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A liquid-in-glass thermometer with sub-microKelvin resolution, and its application for calorimetry
… Contact angle hysteresis was limited by a wetting film and the low meniscus velocity. The sub-microKelvin resolution achieved was the lowest known for any thermometer above cryogenic temperatures. The thermometer was modified for use as a batch analysis microcalorimeter. Special attention …
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NMR Studies of Enhanced Oil Recovery Core Floods and Core Analysis Protocols
… saturation was reduced to a continuous water-wetting film throughout the pore space; further hydrocarbon injection resulted in pore pressure rise and wetting film thinning. L-T1-T2 techniques were also applied to a xanthan gum polymer-EOR flood in a sandstone core, providing a continuous …
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Flotation of sulfide minerals with alkyl pyridinium salts
… component of the disjoining pressure of the wetting film. CpCl has also demonstrated a remarkable selectivity despite the fact that both chalcopyrite and the silicious gangue minerals present in the ore are negatively charged. This may be explained by the premise that cetyl pyridinium ions …
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Modeling Flotation from First Principles Using the Hydrophobic Force as a Kinetic Parameter
… on controlling the stability of the thin liquid films (TLFs) of water formed between minerals and air bubbles (wetting film), air bubbles (foam film), and mineral particles (colloid films). In flotation, a desired mineral is rendered hydrophobic by surfactant coating as a means to destabilize the …
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An interferometric study of spreading liquid films
… contact angle and lateral scale of the precursor wetting film agree quantitatively with theoretical predictions for the spreading of a van der Waals fluid over a wide range of capillary numbers (10-6 < Ca < 10-1). It is also shown that the dynamic contact angle of a perfectly wetting Newtonian …
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Studies of Bitumen Aeration
… record the optical interference patterns of the wetting films formed on a flat surface and subsequently obtain the temporal and spatial profiles of the films offline using the Reynolds lubrication theory. The technique has been used to study the interaction mechanisms between air bubbles and …
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Surface Forces in Thin Liquid Films of H-Bonding Liquids Confined between Hydrophobic Surfaces
… of the hydrophobic forces in the thin liquid films (TLFs) confined between two identical hydrophobic surfaces of contact angle 95.3o using an atomic force microscope (AFM). The measurements are conducted in pure water, pure ethanol, and ethanol-water mixtures of varying mole fractions. The …
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Surface and Hydrodynamic Forces in Wetting Films
… on the surface of a bubble, the thin liquid films (or wetting films) of water formed in between must rupture. According to the Frumkin-Derjaguin isotherm, it is necessary that wetting films can rupture when the disjoining pressures are negative. However, the negative disjoining pressures are …