Preprint Article Version 2 This version is not peer-reviewed

The Thermodynamic Characterization of Wetting by Submitting a Sessile Drop to Microgravity

Version 1 : Received: 17 August 2017 / Approved: 17 August 2017 / Online: 17 August 2017 (16:48:35 CEST)
Version 2 : Received: 11 September 2017 / Approved: 12 September 2017 / Online: 12 September 2017 (04:26:50 CEST)
Version 3 : Received: 26 October 2017 / Approved: 26 October 2017 / Online: 26 October 2017 (10:20:58 CEST)

How to cite: Calvimontes, A. The Thermodynamic Characterization of Wetting by Submitting a Sessile Drop to Microgravity. Preprints 2017, 2017080062 (doi: 10.20944/preprints201708.0062.v2). Calvimontes, A. The Thermodynamic Characterization of Wetting by Submitting a Sessile Drop to Microgravity. Preprints 2017, 2017080062 (doi: 10.20944/preprints201708.0062.v2).

Abstract

A new technique, the sessile drop accelerometry (SDACC) for the study and measurement of the interfacial energies of solid-liquid-gas systems is tested and discussed in this study. The instrument –a combination of a goniometer with high speed camera and a laboratory drop tower- and the evaluation method, were designed to evaluate the interfacial energies as a function of the geometrical changes of a sessile drop shape due to the effect of “switching off” gravity during the experiment. The method bases on the thermodynamic equilibrium of the system interfaces and not on the balance of bi-dimensional tensors on the solid-liquid-gas contour line. A comparison of the model with the widely accepted Young`s equation is discussed in this study.

Subject Areas

surface energy; interfacial energy; surface tension; wetting model; wetting thermodynamics; sessile drop shape; microgravity

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