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 paper, the work of polycrystalline cubic ZrO2 in contact with various liquid metals was determined using the sessile drop technique for the measurement of contact angles.
Abstract: Using the sessile drop technique for the measurement of contact angles, the work of adhesion of polycrystalline cubic ZrO2 in contact with various liquid metals was determined. Based on these experimental values, a model for the evaluation of the work of adhesion is proposed. According to this model the wetting of ZrO2 by the metals indium, tin, bismuth and lead is established by Van der Waals dispersion binding forces. For the transition metals silver, copper, nickel, cobalt and iron a chemical equilibrium bond between the liquid metal and the oxygen ion of the surface oxide is created at the interface. In this case the value of the work of adhesion is related to the enthalpy of formation of the oxide of the metal.
41 citations
TL;DR: In this article, the authors evaluated the adhesion of P. fluorescens (ATCC 17552) to copper, zinc and aluminium brass in the absence and presence of a surface oxide layer.
41 citations
TL;DR: In this article, the effects of substrate roughness on the wettability of non-reactive wetting and compound forming wetting systems were investigated by the sessile drop technique at high temperature.
Abstract: The effects of substrate roughness on the wettability of non-reactive wetting and compound forming wetting systems were investigated by the sessile drop technique at high temperature. The AgCu eutectic alloy/copper and the AgCuTi/alumina wetting systems were selected. It is found that the substrate roughness has a great effect on both wetting systems. For the non-reactive wetting system, an additional capillary driving force exists when melt flows into the micro v-grooves of the rough surface, leading to a decrease in final contact angle (θf) and consequently a better wettability. For the compound forming metal/ceramic reactive wetting system, wetting on a rough surface exhibits a slow spreading kinetics and a short period of spreading time, and the retarding force of spreading increases because of overcoming the energy barriers due to asperities of the rough surface, resulting in an increase in θf. Thus, a rough substrate has negative effect on the wettability of the compound forming reactive wetting system.
41 citations
TL;DR: In this paper, a tensiometric method was proposed for simultaneous measurements of surface tension and contact angles in metal-ceramic systems and the effect of solid roughness on contact angle measurements was studied.
Abstract: Comprehensive use of the immersion-emersion tensiometric method using a cylinder is proposed allowing simultaneous measurements of surface tension and contact angles in metal-ceramic systems. Tin and lead sapphire systems are investigated. Values measured for the surface tension of these metals are in accordance with that measured by the sessile drop method (σLV(Sn) = 465 ± 5 mJm−2 at 1373 K and σLV(Pb) = 380 ± 5 mJm−2 at 1193K). Young's contact angles are evaluated from measured immersion and emersion contact angles and agree well with advancing contact angle measured by the sessile drop method (for Sn-Al2O3, θY = 122 ° and θa = 122 ° at 1373 K, and for Pb-Al2O3, θY = 121 ° and θa = 117 ° ± 3 at 1193 K). The effect of solid roughness on contact angle measurements is shown to be easily studied in metal-ceramic systems using the tensiometric method.
41 citations
TL;DR: The surface tension of liquid copper of 99.999 mass per cent purity has been measured by the sessile drop method in the temperature range 1373 to 1861 K as mentioned in this paper.
41 citations