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    Structural Studies of Nonionic Dodecanol Ethoxylates at the Oil–Water Interface: Effect of Increasing Head Group Size 
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    • Structural Studies of Nonionic Dodecanol Ethoxylates at the Oil–Water Interface: Effect of Increasing Head Group Size
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    • School of Biological and Chemical Sciences
    • Structural Studies of Nonionic Dodecanol Ethoxylates at the Oil–Water Interface: Effect of Increasing Head Group Size
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    Structural Studies of Nonionic Dodecanol Ethoxylates at the Oil–Water Interface: Effect of Increasing Head Group Size

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    Accepted version (464.7Kb)
    Edition
    30
    Volume
    34
    Pagination
    10241 - 10247 (7)
    Publisher
    ACS
    Publisher URL
    http://pubs.acs.org/journal/langd5
    DOI
    10.1021/la502559r
    Journal
    Langmuir: the ACS journal of surfaces and colloids
    Metadata
    Show full item record
    Abstract
    The conformation of charged surfactants at the oil-water interface was recently reported. With the aim to assess the role of the head group size on the conformation of the adsorbed layer, we have extended these studies to a series of non-ionic dodecanol ethoxylate surfactants (C12En, ethylene oxide units n from 6 to 12). The study was performed using neutron reflectometry to enable maximum sensitivity to buried interfaces. Similarly to charged surfactants, the interface was found to be broader and rougher compared to the air-water interface. Irrespectively of the head group size, the tail group region was found to assume a staggered conformation. The conformations of the head group were found to be significantly different compared to the air-water interface, moving from a globular to an almost fully extended conformation at the oil-water interface. The stretching of the head groups is attributed to the presence of some hexadecane oil molecules, which may penetrate all the way to this region. It is proposed here that the presence of the oil, which can efficiently solvate the surfactant tail groups, plays a key role in the conformation of the adsorbed layer and is responsible for the broadening of the interface.
    Authors
    Zarbakhsh, A; Campana, M; Webster, JRP
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/6370
    Collections
    • School of Biological and Chemical Sciences [1689]
    Language
    English
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