Scoppola, Ernesto ; Micciulla, Samantha ; Kuhrts, Lucas ; Maestro, Armando ; Campbell, Richard A. ; Konovalov, Oleg V. ; Fragneto, Giovanna ; Schneck, Emanuel (2022)
Reflectometry Reveals Accumulation of Surfactant Impurities at Bare Oil/Water Interfaces.
In: Molecules, 2022, 24 (22)
doi: 10.26083/tuprints-00015737
Article, Secondary publication, Publisher's Version
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Item Type: | Article |
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Type of entry: | Secondary publication |
Title: | Reflectometry Reveals Accumulation of Surfactant Impurities at Bare Oil/Water Interfaces |
Language: | English |
Date: | 2022 |
Place of Publication: | Darmstadt |
Year of primary publication: | 2022 |
Publisher: | MDPI |
Journal or Publication Title: | Molecules |
Volume of the journal: | 24 |
Issue Number: | 22 |
Collation: | 16 Seiten |
DOI: | 10.26083/tuprints-00015737 |
Corresponding Links: | |
Origin: | Secondary publication DeepGreen |
Abstract: | Bare interfaces between water and hydrophobic media like air or oil are of fundamental scientific interest and of great relevance for numerous applications. A number of observations involving water/hydrophobic interfaces have, however, eluded a consensus mechanistic interpretation so far. Recent theoretical studies ascribe these phenomena to an interfacial accumulation of charged surfactant impurities in water. In the present work, we show that identifying surfactant accumulation with X-ray reflectometry (XRR) or neutron reflectometry (NR) is challenging under conventional contrast configurations because interfacial surfactant layers are then hardly visible. On the other hand, both XRR and NR become more sensitive to surfactant accumulation when a suitable scattering length contrast is generated by using fluorinated oil. With this approach, significant interfacial accumulation of surfactant impurities at the bare oil/water interface is observed in experiments involving standard cleaning procedures. These results suggest that surfactant impurities may be a limiting factor for the investigation of fundamental phenomena involving water/hydrophobic interfaces. |
Uncontrolled Keywords: | X-ray reflectometry, neutron reflectometry, fluorocarbons, liquid/liquid interfaces |
Status: | Publisher's Version |
URN: | urn:nbn:de:tuda-tuprints-157375 |
Classification DDC: | 500 Science and mathematics > 530 Physics 500 Science and mathematics > 540 Chemistry |
Divisions: | 05 Department of Physics > Institute for Condensed Matter Physics |
Date Deposited: | 09 Feb 2022 15:29 |
Last Modified: | 06 Mar 2023 07:55 |
SWORD Depositor: | Deep Green |
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/15737 |
PPN: | 505481111 |
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