Browsing by Author "Pottage, MJ"

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    Fluorinated lamellar phases: structural characterisation and use as templates for highly ordered silica materials
    (Royal Society of Chemistry, 2014-05-13) Pottage, MJ; Tiara, K; Grillo, I; Garvey, CJ; Stickland, AD; Tabor, RF
    Highly ordered silica was synthesised by using a lamellar phase comprising the anionic fluorinated surfactant sodium perfluorooctanoate and the partially-fluorinated co-surfactant/oil 1H,1H,2H,2H-perfluorooctan-1-ol in water. The phase behaviour of this system was thoroughly analysed, and it was found that even low levels of the alcohol (<0.5 mol%) were sufficient to induce a phase change from normal micelles to a lamellar phase, rationalised as a result of geometric and electrostatic effects. The properties of these phases were compared to their hydrocarbon analogues, demonstrating the unique and valuable properties exhibited by fluorocarbons, directly related with the observed nanostructure. Small-angle neutron scattering was used to analyse the internal structure of the systems, providing information on the inter-lamellar spacing, bilayer thickness and membrane elasticity. The potential for these phases to act as shear-thinning lubricants was assessed using oscillatory rheology, obtaining shear-dependent viscosity along with storage and loss moduli.© 2014, The Royal Society of Chemistry.
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    Reversible pH- and photocontrollable carbohydrate-cased surfactants
    (Wiley Online Library, 2014-09-11) Tabor, RF; Tan, DD; Han, SS; Young, SA; Seeger, ZLE; Pottage, MJ; Garvey, CJ; Wilkinson, BL
    The parallel synthesis and properties of a library of photoswitchable surfactants comprising a hydrophobic butylazobenzene tail-group and a hydrophilic carbohydrate head-group, including the first surfactants to exhibit dual photo- and pH-responsive behavior, is reported. This new generation of surfactants shows varying micelle morphologies, photocontrollable surface tension, and pH-induced aggregation and adsorption. © 2014, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim.