Multilayer Adsorption of Heptane Vapor at Water Drop Surfaces
by
Volodymyr I. Kovalchuk 1, Eugene V. Aksenenko 2, Valentin B. Fainerman 3, Aliyar Javadi 4,5 and Reinhard Miller 4,*
Volodymyr I. Kovalchuk 1, Eugene V. Aksenenko 2, Valentin B. Fainerman 3, Aliyar Javadi 4,5 and Reinhard Miller 4,*
1
Institute of Biocolloid Chemistry, 03680 Kyiv (Kiev), Ukraine
2
Institute of Colloid Chemistry and Chemistry of Water, 03680 Kyiv (Kiev), Ukraine
3
SINTERFACE Technologies, 12489 Berlin, Germany
4
Max-Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
5
Institute of Petroleum Engineering, University of Tehran, 14174-66191 Tehran, Iran
*
Author to whom correspondence should be addressed.
Colloids Interfaces 2017, 1(1), 8; https://doi.org/10.3390/colloids1010008
Received: 16 November 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 4 December 2017
(This article belongs to the Special Issue Selected Papers from Bubble & Drop 2017)
The measured dynamic surface tension of a water drop in air saturated by heptane vapor shows a sharp decrease from about 60 mN m−1 to 40 mN m−1, and less after a certain adsorption time. The observed adsorption kinetics is analyzed by a theoretical model based on multilayer adsorption of alkanes from the vapor phase at the water surface. The model assumes a dependence of the kinetic coefficients of adsorption and desorption on the surface coverage and in equilibrium it reduces to the classical Brunauer–Emmett–Teller adsorption isotherm. The calculated time dependencies of adsorption and surface tension agree well with experimental data and predict a five-layer adsorption of heptane.
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Keywords:
heptane adsorption from vapor phase; drop profile analysis tensiometry; adsorption kinetics model; multilayer adsorption
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MDPI and ACS Style
Kovalchuk, V.I.; Aksenenko, E.V.; Fainerman, V.B.; Javadi, A.; Miller, R. Multilayer Adsorption of Heptane Vapor at Water Drop Surfaces. Colloids Interfaces 2017, 1, 8.
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