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dc.contributor.authorGoussous, Samien
dc.contributor.authorCasford, Michaelen
dc.contributor.authorJohnson, SAen
dc.contributor.authorDavies, Paulen
dc.date.accessioned2017-01-30T11:52:28Z
dc.date.available2017-01-30T11:52:28Z
dc.date.issued2017-02-15en
dc.identifier.issn0021-9797
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/262127
dc.description.abstractMolecular scale information about the structure of surfactants at interfaces underlies their application in consumer products. In this study the non-linear optical technique of Sum Frequency Generation (SFG) vibrational spectroscopy has been used to investigate the structure and temporal behaviour of two cationic surfactants used frequently in hair conditioners. SFG spectra of films of behenyltrimethylammonium methosulfate (BTMS) and behenyltrimethylammonium chloride (BTAC) were recorded at the air/water interface and on glass slides following Langmuir Blodgett (LB) deposition. The assignment of the BTMS and BTAC spectral features (resonances) to the CH stretching modes of the surfactants was consolidated by comparison with the SFG spectrum of deuterated cetyltrimethylammonium bromide (d-CTAB) and by recording spectra on D$_{2}$O as well as on water. The CH resonances arise from the methylene and methyl groups of the tail and head-groups of the surfactants. A slow collapse mechanism was observed following film compression of both BTAC and BTMS. The change in molecular structure of the films undergoing this slow collapse was followed by recording sequential SFG spectra in the CH region, and by monitoring the SFG intensity at specific wavenumbers over time. Additionally, LB deposition onto glass was used to capture the state of the film during the slow collapse, and these SFG spectra showed close similarity to the corresponding spectra on water. Complementary Atomic Force Microscopy (AFM) was used to elucidate the layering of the compressed and relaxed films deposited onto mica by LB deposition.
dc.description.sponsorshipWe thank Unilever R&D and the EPSRC for an iCASE studentship for SAG.
dc.languageEnglishen
dc.language.isoenen
dc.publisherElsevier
dc.titleA structural and temporal study of the surfactants behenyltrimethylammonium methosulfate and behenyltrimethylammonium chloride adsorbed at air/water and air/glass interfaces using sum frequency generation spectroscopyen
dc.typeArticle
prism.endingPage372
prism.publicationDate2017en
prism.publicationNameJournal of Colloid and Interface Scienceen
prism.startingPage365
prism.volume488en
dc.identifier.doi10.17863/CAM.7375
dcterms.dateAccepted2016-10-31en
rioxxterms.versionofrecord10.1016/j.jcis.2016.10.092en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-02-15en
dc.contributor.orcidCasford, Michael [0000-0003-1373-5383]
dc.contributor.orcidDavies, Paul [0000-0001-7314-2243]
dc.identifier.eissn1095-7103
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (1505859)
rioxxterms.freetoread.startdate2017-11-03


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