Comparison of contact angle measurement methods of liquids on metal alloys

Konrad Terpiłowski,Diana Rymuszka,Robert Banach,Lucyna Hołysz

doi:10.17951/aa.2016.71.1.89

Konrad Terpiłowski, Diana Rymuszka + Show 2 more

Open Access

https://doi.org/10.17951/aa.2016.71.1.89

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Abstract

<p>The paper presents the studies of metal wettability using two methods: the sessile droplet and immersion ones. Based on the measured contact angles, there was calculated apparent surface free energy from the acidic–basic approach and the contact angle hysteresis. The advancing contact angles measured using the immersion method exhibit a little higher values than those measured by the sessile droplet method. The application of the immersion method leads to obtaining higher contact angle hysteresis. Both methods give different values of contact angles but they can be applied independently for estimation of metal surface wettability.</p>

Highlights

The phenomenon of solid wettability by liquids is one of the commonly applied in nature and human life
In spite of the problems connected with estimation of the apparent surface free energy, it is one of the most frequently determined quantity in industry is usually called surface tension of solids and is estimated based on the studies of spreading of calibrated probe liquids over solids
A trial of probe liquid of known surface tension is made on the surface and if the liquid does not spread completely or converge into a droplet for a few seconds, the apparent surface free energy of a given solid is equal to the surface tension of the probe liquid

Summary

Introduction

The phenomenon of solid wettability by liquids is one of the commonly applied in nature and human life. A trial of probe liquid of known surface tension is made on the surface and if the liquid does not spread completely or converge into a droplet for a few seconds, the apparent surface free energy of a given solid is equal to the surface tension of the probe liquid. The results of such studies are insufficient and the lifetime of testers is short. Contact angle is measured using special devices with a sensitive camera and suitable computer program enabling picture treatment.

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