The Measurement of the Surface Energy of Solids by Sessile Drop Accelerometry

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  1. Interdisciplinary science challenges for gravity dependent phenomena in physical and biological systems

Abstract

A new physical method, 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 laboratory instrument and technique—a combination of a drop shape analyzer with high-speed camera and a laboratory drop tower- and the evaluation algorithms, were designed to calculate 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 approach of the two hundred-years-old Young’s equation in that it assumes a thermodynamic equilibrium between interfaces, rather than a balance of tensions on a point of the solid-liquid-gas contour line. A comparison of the mathematical model that supports the method with the widely accepted Young‘s equation is discussed in detail in this study. The method opens new possibilities to develop surface characterization procedures by submitting the solid-liquid-system to artificial generated and uniform force fields.

Keywords

Surface energy Interfacial energy Surface tension Wetting model Wetting thermodynamics Sessile drop shape Microgravity 

Notes

Compliance with Ethical Standards

Conflict of interest

The author declares no conflict of interest.

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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Predevelopment, Division Dish CareBSH Hausgeräte GmbH (a subsidiary of Robert Bosch GmbH)Dillingen an der DonauGermany

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