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Direct Resolution of the Interactions of a Hydrocarbon Gas with Adsorbed Surfactant Monolayers at the Water/Air Interface Using Neutron Reflectometry

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
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Item Type: Article
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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