Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry
Surface tension experiments were performed using the drop profile analysis tensiometry method. The hexane was injected into the measuring cell at certain times before the formation of the solution drop. The influence of the capillary diameter and solution drop size on the measured apparent dynamic s...
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doaj-686b6770f98e4b618bd8aada52df6f822020-11-25T03:28:51ZengMDPI AGColloids and Interfaces2504-53772020-07-014292910.3390/colloids4030029Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis TensiometryValentin B. Fainerman0Volodymyr I. Kovalchuk1Eugene V. Aksenenko2Altynay A. Sharipova3Libero Liggieri4Aliyar Javadi5Alexander V. Makievski6Mykola V. Nikolenko7Saule B. Aidarova8Reinhard Miller9Sinterface Technologies, D12489 Berlin, GermanyInstitute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), UkraineInstitute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, 03680 Kyiv (Kiev), UkraineKazakh-British Technical University, 050000 Almaty, KazakhstanCNR-Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Genoa, 16149 Genoa, ItalyInstitute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, GermanySinterface Technologies, D12489 Berlin, GermanyUkrainian State University of Chemical Technology, 49000 Dnipro, UkraineKazakh-British Technical University, 050000 Almaty, KazakhstanPhysics Department, Technical University Darmstadt, 64289 Darmstadt, GermanySurface tension experiments were performed using the drop profile analysis tensiometry method. The hexane was injected into the measuring cell at certain times before the formation of the solution drop. The influence of the capillary diameter and solution drop size on the measured apparent dynamic surface tension was studied. The amount of hexane transferred from the vapor phase to the drop was estimated. For large pure water drops, it was shown that the ageing of the drop in the hexane vapor during a long time resulted in the formation of a liquid hexane phase covering the drop, but the volume of this phase did not exceed 0.5 mm<sup>3</sup>. On the contrary, for surfactant solution drops the volume of the hexane phase covering the drop was essentially larger. Experiments with solution drops were performed to measure the surface tension within a wide range of surfactant concentration. It was found that the dependencies of dynamic surface tension on the C<sub>13</sub>DMPO and C<sub>14</sub>EO<sub>8</sub> solutions concentration exhibit maxima at concentrations of about 1–2 μmol/L for C<sub>14</sub>EO<sub>8</sub> and 2–5 μmol/L for C<sub>13</sub>DMPO at ageing times of 100 to 1000 s; these maxima were shown to exist also at equilibrium. This phenomenon is presumably ascribed to the competitive character of simultaneous adsorption of hexane and surfactant.https://www.mdpi.com/2504-5377/4/3/29drop profile analysis tensiometrysolution–alkane vapor interfacedynamic apparent surface tensionnon-ionic surfactantthermodynamic model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Altynay A. Sharipova Libero Liggieri Aliyar Javadi Alexander V. Makievski Mykola V. Nikolenko Saule B. Aidarova Reinhard Miller |
spellingShingle |
Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Altynay A. Sharipova Libero Liggieri Aliyar Javadi Alexander V. Makievski Mykola V. Nikolenko Saule B. Aidarova Reinhard Miller Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry Colloids and Interfaces drop profile analysis tensiometry solution–alkane vapor interface dynamic apparent surface tension non-ionic surfactant thermodynamic model |
author_facet |
Valentin B. Fainerman Volodymyr I. Kovalchuk Eugene V. Aksenenko Altynay A. Sharipova Libero Liggieri Aliyar Javadi Alexander V. Makievski Mykola V. Nikolenko Saule B. Aidarova Reinhard Miller |
author_sort |
Valentin B. Fainerman |
title |
Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry |
title_short |
Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry |
title_full |
Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry |
title_fullStr |
Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry |
title_full_unstemmed |
Drop Size Dependence of the Apparent Surface Tension of Aqueous Solutions in Hexane Vapor as Studied by Drop Profile Analysis Tensiometry |
title_sort |
drop size dependence of the apparent surface tension of aqueous solutions in hexane vapor as studied by drop profile analysis tensiometry |
publisher |
MDPI AG |
series |
Colloids and Interfaces |
issn |
2504-5377 |
publishDate |
2020-07-01 |
description |
Surface tension experiments were performed using the drop profile analysis tensiometry method. The hexane was injected into the measuring cell at certain times before the formation of the solution drop. The influence of the capillary diameter and solution drop size on the measured apparent dynamic surface tension was studied. The amount of hexane transferred from the vapor phase to the drop was estimated. For large pure water drops, it was shown that the ageing of the drop in the hexane vapor during a long time resulted in the formation of a liquid hexane phase covering the drop, but the volume of this phase did not exceed 0.5 mm<sup>3</sup>. On the contrary, for surfactant solution drops the volume of the hexane phase covering the drop was essentially larger. Experiments with solution drops were performed to measure the surface tension within a wide range of surfactant concentration. It was found that the dependencies of dynamic surface tension on the C<sub>13</sub>DMPO and C<sub>14</sub>EO<sub>8</sub> solutions concentration exhibit maxima at concentrations of about 1–2 μmol/L for C<sub>14</sub>EO<sub>8</sub> and 2–5 μmol/L for C<sub>13</sub>DMPO at ageing times of 100 to 1000 s; these maxima were shown to exist also at equilibrium. This phenomenon is presumably ascribed to the competitive character of simultaneous adsorption of hexane and surfactant. |
topic |
drop profile analysis tensiometry solution–alkane vapor interface dynamic apparent surface tension non-ionic surfactant thermodynamic model |
url |
https://www.mdpi.com/2504-5377/4/3/29 |
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