Rheological behaviour of polyoxometalate-doped lyotropic lamellar phases |
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| Authors: | J P de Silva A S Poulos B Pansu P Davidson B Kasmi D Petermann S Asnacios F Meneau M Impéror |
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| Institution: | (1) Department of Pharmaceutics and Analytical Chemistry, The Danish University of Pharmaceutical Sciences, Universitetsparken 2, 2100 Copenhagen, Denmark;(2) Department of Chemistry and iNANO Interdisciplinary Nano Science Center, University of Aarhus, Langelandsgade 140, 8000 Aarhus C, Denmark;(3) Biophysics, Department of Natural Sciences, The Royal Veterinary and Agricultural University, Thorvaldensevej 40, 1871 Frederiksberg C, Denmark;(4) Department of Food Technology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, 22100 Lund, Sweden |
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| Abstract: | We study the influence of nanoparticle doping on the lyotropic liquid crystalline phase of the industrial surfactant Brij30
( C12E4 and water, doped with spherical polyoxometalate nanoparticles smaller than the characteristic dimensions of the host lamellar
phase. We present viscometry and in situ rheology coupled with small-angle X-ray scattering data that show that, with increasing doping concentration, the nanoparticles
act to decrease the shear viscosity of the lamellar phase, and that a shear-induced transition to a multilamellar vesicle
“onion” phase is pushed to higher shear rates, and in some cases completely suppressed. X-ray data reveal that the nanoparticles
remain encapsulated within the membranes of the vesicles, thus indicating a viable method for the fabrication of nanoparticle
incorporating organic vesicles. |
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