Colloids Interfaces 2017, 1(1), 8; https://doi.org/10.3390/colloids1010008
Multilayer Adsorption of Heptane Vapor at Water Drop Surfaces
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.
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)
Abstract
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. View Full-TextKeywords:
heptane adsorption from vapor phase; drop profile analysis tensiometry; adsorption kinetics model; multilayer adsorption
▼
Figures
Graphical abstract
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).
Share & Cite This Article
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.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
Article Metrics
Comments
[Return to top]
Colloids Interfaces
EISSN 2504-5377
Published by MDPI AG, Basel, Switzerland
RSS
E-Mail Table of Contents Alert