Campbell, Richard A. ; Kairaliyeva, Talmira ; Santer, Svetlana ; Schneck, Emanuel ; Miller, Reinhard (2022)
Direct Resolution of the Interactions of a Hydrocarbon Gas with Adsorbed Surfactant Monolayers at the Water/Air Interface Using Neutron Reflectometry.
In: Colloids and Interfaces, 2022, 6 (4)
doi: 10.26083/tuprints-00022975
Article, Secondary publication, Publisher's Version
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Item Type: | Article |
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Type of entry: | Secondary publication |
Title: | Direct Resolution of the Interactions of a Hydrocarbon Gas with Adsorbed Surfactant Monolayers at the Water/Air Interface Using Neutron Reflectometry |
Language: | English |
Date: | 19 December 2022 |
Place of Publication: | Darmstadt |
Year of primary publication: | 2022 |
Publisher: | MDPI |
Journal or Publication Title: | Colloids and Interfaces |
Volume of the journal: | 6 |
Issue Number: | 4 |
Collation: | 12 Seiten |
DOI: | 10.26083/tuprints-00022975 |
Corresponding Links: | |
Origin: | Secondary publication DeepGreen |
Abstract: | We have directly resolved in the present work the interfacial composition during and after the interactions of a saturated atmosphere of oil vapor with soluble surfactant solutions at a planar water/air interface for the first time. Experiments were conducted on interactions of hexane vapor with solutions of alkyltrimethylammonium bromides and sodium dodecyl sulfate to observe the balance between cooperativity and competition of the components at the interface. In all cases, hexane adsorption was strongly enhanced by the presence of the surfactant, even at bulk surfactant concentrations four orders of magnitude below the critical micelle concentration. Cooperativity of the surfactant adsorption was observed only for sodium dodecyl sulfate at intermediate bulk concentrations, yet for all four systems, competition set in at higher concentrations, as hexane adsorption reduced the surfactant surface excess. The data fully supported the complete removal of hexane from the interface following venting of the system to remove the saturated atmosphere of oil vapor. These results help to identify future experiments that would elaborate and could explain the cooperativity of surfactant adsorption, such as on cationic surfactants with short alkyl chains and a broader series of anionic surfactants. This work holds relevance for oil recovery applications with foam, where there is a gas phase saturated with oil vapor. |
Uncontrolled Keywords: | surfactant adsorption, alkyltrimethylammonium bromides, sodium dodecyl sulfate, water/hexane vapor interface, neutron reflectometry, mixed adsorption layer, cooperative adsorption, competitive adsorption |
Status: | Publisher's Version |
URN: | urn:nbn:de:tuda-tuprints-229756 |
Additional Information: | This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members of Colloids and Interfaces 2022 |
Classification DDC: | 500 Science and mathematics > 530 Physics |
Divisions: | 05 Department of Physics > Institute for Condensed Matter Physics |
Date Deposited: | 19 Dec 2022 12:35 |
Last Modified: | 14 Nov 2023 19:05 |
SWORD Depositor: | Deep Green |
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/22975 |
PPN: | 503240389 |
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