Topic
Sessile drop technique
About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.
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TL;DR: In this article, a reduction in the terminal contact angle of 30 degrees to a value of 31 degrees was observed under vacuum conditions. But this effect is related to either the dissolution of carbon in aluminum or the formation of aluminum carbide, as revealed by profilometry of substrates following removal of aluminum sessile drops.
Abstract: Vapor-deposited carbon films on sapphire enhance its wettability by high-purity aluminum. A reduction in the terminal contact angle of 30 deg, to a value of 31 deg, occurs at 1223 K under vacuum conditions. This effect is related to either the dissolution of carbon in aluminum or the formation of aluminum carbide. Etching of the sapphire by molten aluminum is greatly enhanced by the presence of carbon, as revealed by profilometry of substrates following removal of the aluminum sessile drops.
29 citations
TL;DR: In this paper, the effect of copper concentration in near-eutectic liquid SAC solders on their thermophysical properties: viscosity, surface tension, density; as well as wetting behavior on copper substrates at 523
Abstract: Purpose – The purpose of this paper is to study the effect of copper concentration in near‐eutectic liquid SAC solders on their thermophysical properties: viscosity, surface tension, density; as well as wetting behavior on copper substrates at 523 K.Design/methodology/approach – Viscosity, surface tension, and density were studied over a broad range of temperatures with the recently developed Roach‐Henein method. The obtained results were compared with the data from modified capillary, maximum bubble pressure, wetting balance and dilatometric measurements. Wetting angles measured with wetting balance method were compared with the results of sessile drop measurements.Findings – The results obtained indicate that increasing concentration of copper in the alloy results in higher density, surface tension and viscosity, but differences resulting from copper concentration on wettability are relatively small. At 523 K, the density is: 7.097, 7.186, 7.232 g cm−3, the surface tension is: 538.1, 553.5, 556.7 m Nm−1...
29 citations
TL;DR: In this paper, the surface of CVD-BN was examined by XRD and the surface energy was mainly composed of those low energy planes parallel to (001), according to the relationship of the spreading kinetics from the experiments.
Abstract: The wettability and spreading kinetics of liquid AI on CVD-BN were investigated by the sessile drop method in a vacuum of about 1.1×10−3 Pa at 1070 to 1430 K. The wettability on the Al-BN system was different from that of the Al-SiC system reported in the literature. The wetting angle of Al-BN linearly decreased with an increase of temperature in high temperature range, and tended towards 15° at 1430 K. Complete wetting could be obtained at about 1470 K. The interface energy between liquid Al and the reaction layer and the surface energy of CVD-BN were calculated by means of Warren thermodynamics analysis. The surface of CVD-BN was examined by XRD. The results show that the surface of CVD-BN was chiefly composed of those low energy planes parallel to (001). According to the relationship of the spreading kinetics from the experiments, the apparent activation energy of the liquid Al spreading on the surface of CVD-BN was calculated. The result shows that the activation energy of interfacial reaction accounts for about 54% of the spread activation energy. The spread of liquid Al on CVD-BN was affected by the interfacial reaction, diffusion and liquid movement on the surface.
29 citations
TL;DR: In this article, the problem of spreading behaviors of pendant and sessile drops was studied experimentally and numerically under the action of gravity force and surface tension, and the surface shape change of liquid drops was investigated.
Abstract: The problem of spreading behaviors of pendant and sessile drops was studied experimentally and numerically under the action of gravity force and surface tension. Bond number was considered to be a main factor of the influence on shape behaviors of liquid drops. This study was performed in the framework of an experimental investigation of drop behaviors in microgravity onboard a Chinese satellite in future. The experiments were carried out in the Drop Tower of Beijing, which could supply about 3.6 s of microgravity (free-fall) time. The surface shape change of liquid drops was investigated and the contact angle variety in sessile and pendant drops were measured from normal gravity to microgravity. A sharp decrease and oscillatory variation of the contact angle for both sessile and pendant drops were found with the sudden decrease of Bond number. The succedent comparison between experimental and numerical results suggests that Bond number has a significant influence on the drop contact angle. Additionally, the drop shapes and the bulk flows inside sessile and pendant drops were analyzed numerically, and it was found that the bulk flows could affect the free-surface shape of liquid drops apparently. Comparison of the moving velocity of contact line between sessile and pendant drops indicated that the pendant drops had a faster response to Bond number.
29 citations
TL;DR: The wettability of graphite by the silver-tin (Ag-Sn) liquid alloy was measured using the sessile drop method at a temperature interval of 1273-1473 K as mentioned in this paper.
29 citations