Preprint Article Version 1 This version is not peer-reviewed

Young’s Equation vs. Sessile Drop Accelerometry: A Comparison Using the Interfacial Energies of Seven Polymer-water Systems

Version 1 : Received: 2 February 2018 / Approved: 2 February 2018 / Online: 2 February 2018 (13:05:40 CET)

How to cite: Calvimontes, A. Young’s Equation vs. Sessile Drop Accelerometry: A Comparison Using the Interfacial Energies of Seven Polymer-water Systems. Preprints 2018, 2018020018 (doi: 10.20944/preprints201802.0018.v1). Calvimontes, A. Young’s Equation vs. Sessile Drop Accelerometry: A Comparison Using the Interfacial Energies of Seven Polymer-water Systems. Preprints 2018, 2018020018 (doi: 10.20944/preprints201802.0018.v1).

Abstract

In this study, the values of the interfacial energies of seven different polymer-water systems obtained by Sessile Drop Accelerometry (SDACC) are compared with the values obtained by the Young’s-equation-based Owens-Wendt method. The SDACC laboratory instrument –a combination of a drop shape analyzer with high-speed camera and a microgravity tower- and the evaluation algorithms, are designed to measure the interfacial energies as a function of the geometrical changes of a sessile droplet shape due to the effect of “switching off” gravity during the experiment. The method bases on Thermodynamics of Interfaces and differs from the conventional aproach of the two hundred-years-old Young’s equation in that it assumes a thermodynamic equilibrium between interfaces, rather than a balance of forces on a point of the solid-liquid-gas contour line. A comparison of the mathematical model that supports the SDACC method with the widely accepted Young`s equation is discussed in detail in this study.

Subject Areas

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

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