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Colloid. Interface. 2017, 1(1), 1; doi:10.3390/colloids1010001

Surface Tension Measurements with the Drop Profile Analysis Tensiometry—Consideration of the Surfactant Mass Balance in a Single Drop

1
Max-Planck-Institut für Kolloid- und Grenzflächenforschung, D-14476 Potsdam, Germany
2
Kazakh National Research Technical University K.I. Satpayev, Almaty 050013, Kazakhstan
3
Faculty of Technology, University of Novi Sad, 21000 Novi Sad, Serbia
4
Institute of Colloid Chemistry and Chemistry of Water, 03680 Kyiv, Ukraine
5
SINTERFACE Technologies, D-12489 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 3 August 2017 / Revised: 23 August 2017 / Accepted: 29 August 2017 / Published: 1 September 2017
(This article belongs to the Special Issue Selected Papers from Bubble & Drop 2017)
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Abstract

In drop profile analysis tensiometry, the ratio of drop surfaces area S to volume V is large, i.e., S/V >> 1. In such a case, the concentration of a surfactant within the drop bulk decreases due to adsorption at the drop surface. In contrast, in bubble profile analysis tensiometry, we have S/V << 1 so that depletion due to adsorption is negligible. A protocol is presented to determine the correct adsorption parameters of surfactants from surface tension data measured by bubble and drop profile analysis tensiometry. The procedure is applied to experimental data measured for selected surfactants of different adsorption activities: C10OH, CTAB, Tween 20, and the equimolar mixture SDS + DoTAB. The results show that for surfactants with higher surface activity, the differences between the surface tensions measured with the drops and bubbles profile analysis tensiometry, respectively, are larger, while for less surface-active surfactants, such as SDS, the results obtained from drop and bubble profile experiments are very close. The correction procedure is based on the same set of adsorption parameters used to fit both the experimental data obtained from drop-based measurements (which involve the depletion effects) and those data measured in a way that depletion effects are negligible. View Full-Text
Keywords: surfactant adsorption; bubble and drop profile analysis tensiometry; surfactant depletion due to adsorption; model calculations surfactant adsorption; bubble and drop profile analysis tensiometry; surfactant depletion due to adsorption; model calculations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kairaliyeva, T.; Mucic, N.; Spasojevic, L.; Bucko, S.; Katona, J.; Aksenenko, E.; Aidarova, S.; Fainerman, V.; Makievski, A.; Tarasevich, Y.; Miller, R. Surface Tension Measurements with the Drop Profile Analysis Tensiometry—Consideration of the Surfactant Mass Balance in a Single Drop. Colloid. Interface. 2017, 1, 1.

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Colloid. Interface. EISSN 2504-5377 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
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