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Showing 1 to 15 of 15 for “"Static contact angle."”.
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An experimental study of critical heat flux with surface modification and its analytic prediction model development
… surface parameters such as wettability and static contact angle, parameters that the proposed CHF prediction model incorporates. The surface oxidation coating with AP-Plasma makes the surface features (static contact angle, oxidation layer thickness) become more hydrophilic and reduces the …
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Dynamic Contact Angles And Wetting Front Instability In Soils
Dynamic contact could provide a mechanism for initiating the instability of wetting fronts and the formation of gravity fingers/columns in porous media. To study those dynamic contact angles when gravity effects are present, rectangular capillary tubes are used to facilitate the observation of the …
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Synthesis of Well-Defined Multi-End Functionalized Polymers via Living Anionic Polymerization
… we have characterized these polymer films using static contact angle measurements with water as the main contact fluid. We have systematically studied the effect of additive molecular weight, concentration and annealing conditions on the surface properties. It has been discovered that these …
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Voltage induced spreading and liquid optical devices
… spreading of the droplet into a low contact angle droplet/film, an effect which will be referred to here as "dielectrowetting". Further application of the A.C. voltage to the electrodes results in a static sinusoidal wrinkle forming at the oil-air interface on the spread film. Three …
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Investigation of the pool boiling heat transfer enhancement of nano-engineered fluids by means of high-speed infrared thermography
… It was determined that a reduction in the static contact angle, caused by nanoparticle deposition on the surface during boiling, created a larger energy barrier for nucleation, which in turn reduced bubble departure frequency and nucleation density, thus resulting in a reduced heat transfer …
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Pool boiling heat transfer characteristics of nanofluids
… wettability, as shown by measured changes in the static contact angle on the nanofluid-boiled surfaces compared with the pure-water-boiled surfaces. It is hypothesized that surface wettability improvement may be responsible for the CHF enhancement.
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Enhancement of Pool Boiling Heat Transfer by Brazed Aluminum Microporous Coating in Saturated Water
… nanoscale Boehmite layer which decreases the static contact angle, from 55° to 12°, and consequently increases the wettability. The Boehmite treated plain aluminum surface has a CHF of 1,850 kW/m² and a NBHT coefficient of 55.7 kW/m²K. Compared to the plain aluminum surface, the aluminum HTCMC …
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Effects of the hydrophobic coating on the initiation of frost formation.
… time of single water droplets with three various static contact angles were developed. The correlations can be used to predict dimensionless freezing time in a wide range of experimental conditions. Dimensionless freezing times among droplets with different shapes were also compared. Through …
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Influence of Surface Wettability on Drop Dynamics and Condensation
… to specify the surface wettability: rest or static contact angle (_) and contact angle hysteresis (__). Partially non-wettable surfaces are characterized by static contact angles _ > 90° while partially wettable surfaces _ < 90°. Contact angle hysteresis, defined as the difference in dynamic …
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Bioadhesion to model thermally responsive surfaces
… was confirmed to be thermally responsive by contact angle goniometry, 35° at 28 °C and 55° at 40 °C. In addition, the mixed SAM surfaces were confirmed to be thermally responsive for various aqueous mediums by tensiometry. Factors such as oxygen, age, and surface mole fraction and how they …
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Synthesis and Characterization of Thin films of Novel Functionalised 2,5-Dithienylpyrrole Derivatives on Oxide Substrates
… by self-assembling technique from solution. Static contact angle gave the first indication of a successful adsorption. The kinetics of adsorption was monitored by Surface Plasmon Resonance Spectroscopy (SPR), Angle-Resolved X-Ray Photoelectron Spectroscopy (AR-XPS) confirms that the molecules …
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Fabrication of metal-oxide thin-films and features on dissimilar materials via ion-assisted codeposition
… (AFM), chemistry (XPS), and wettability (static contact angle). This technique has yielded a number of interesting surfaces. On Si, the formation of nanodots is seen under many processing parameters. These dots have no ordering, but their size (~20-100 nm diameter) and spatial density …
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Computations of bubble dynamics with heat transfer
… by continuously bringing cooler liquid into contact with the hot surface and removing hot liquid from the surface. However, despite its industrial relevance, many important hydrodynamics and heat transfer phenomena associated with bubble flow, such as bubble formation, bubble coalescence, …
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Microvascular materials for adaptive electronic structures
… exhibit a high RMS roughness (110 nm), high static contact angle (SCA) (170°), and low sliding angle (SA) (14°) for EGaIn. Coatings are applied to the interior of high aspect ratio (L/D = 66.7) microchannels and electrical switching capabilities evaluated. Channels coated with 12.5:87.5 …
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GREEN CATALYTIC STRATEGIES FOR THE PRODUCTION OF BIOBASED BUILDING-BLOCKS
… of the two supports were confirmed through static contact angle measurements and with hydroxyl density determination using TGA. The catalysts were tested in the hydrogenation of GVL to give 1,4-PDO (T=160 °C, P(H2) = 50 bar, t = 22h) after catalysts pre-reduction under CPME. The best …