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 wettability of glassy carbon by liquid silicon has been investigated at 1430°C in argon by using techniques of both in situ formation and capillary formation of sessile drops.
Abstract: The wettability of glassy carbon by liquid silicon has been investigated at 1430°C in argon by using techniques of both in situ formation and capillary formation of sessile drops. Analyses of the results showed that there are three distinct contributions of reaction to wetting: (a) dissolution of solid substrate carbon in liquid silicon; (b) formation of a continuous SiC layer at the solid side of the interface, and (c) a contribution of the free energy released by the reaction localized at the interface between liquid silicon and solid carbon.
79 citations
TL;DR: In this paper, the wettability of sapphire single crystals by liquid copper which contained oxygen added as cupric oxide was investigated using the sessile drop technique in vacuum at 1230°C.
Abstract: The wettability of sapphire single crystals by liquid copper which contained oxygen added as cupric oxide was investigated using the sessile drop technique in vacuum at 1230°C. Additions of cupric oxide to copper, varying from 1 to 72% of copper weight, resulted in rapid chemical reaction at the solid-liquid interface with a significant reduction of the contact angle, the final value being dependent on the oxygen in the system. In all cases the interfacial product was CuAlO2. A linear relation between the fourth power of the basal radius of the molten drop and the amount of oxygen present was observed. The initial stage of the reaction could be explained by the formation of a Cu2O layer at the interface, followed by reaction between Cu2O and Al2O3 to form CuAlO2.
79 citations
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TL;DR: In this article, the authors designed surfaces covered with nano-wires obtained by the vapor-liquid-solid (VLS) growth technique, that are able to repel most of the existing non-polar liquids including those of very low surface tension, as well as many polar liquids of moderate to high surface tension.
Abstract: The quality of a liquid-repellent surface is quantified by both the apparent contact angle $\theta_0$ that a sessile drop adopts on it, and the value of the liquid pressure threshold the surface can withstand without being impaled by the liquid, hence keeping a low-friction condition. We designed surfaces covered with nano-wires obtained by the vapor-liquid-solid (VLS) growth technique, that are able to repel most of the existing non-polar liquids including those of very low surface tension, as well as many polar liquids of moderate to high surface tension. These super-omniphobic surfaces exhibit apparent contact angles ranging from 125 to 160$^{\circ}$ depending on the liquid. We tested the robustness of the surfaces against impalement by carrying out drop impact experiments. Our results show how this robustness depends on the Young's contact angle $\theta_0$ related to the surface tension of the liquid, and that the orientational growth of NWs is a favorable factor for robustness.
79 citations
TL;DR: In this article, the results of surface tension measurements of liquid iron and iron-oxygen alloys by the oscillating droplet method using the levitation technique were compared to those obtained by the sessile drop method, the technique most frequently employed for surface tension measurement of liquid metals.
78 citations
TL;DR: The relationship among contact angles, surface tension, and surface roughness is reviewed in this paper, and various numerical formulae related to contact angles are used to predict the surface tension and wetting behavior of polymer surfaces.
Abstract: The relationships among contact angles, surface tensions, and surface roughness are reviewed. The various numerical formulae related to contact angles were used to predict the surface tension and wetting behavior of polymer surfaces. The apparent contact angle of a droplet deposited on a textured surface is presented, and the characteristics required for a superhydrophobic surface are described. This study also presents the effect of the sliding angles of liquid droplets on smooth and rough surfaces. The contact angle hysteresis was found to be very important in understanding the drop motion on a surface. Contact angle hystereses increased on a Wenzel-type surface, while a Cassie-Baxter type surface reduced the hystereses for the same surface roughness and surface tensions.
78 citations