Aggregate morphology and flow behaviour of micellar alkylglycoside solutions |
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Authors: | Caroline A Ericsson Olle Söderman Stefan Ulvenlund |
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Institution: | (1) Department of Physical Chemistry 1, Centre of Chemistry and Chemical Engineering, Lund University, P.O. Box 124, , 22100 Lund, Sweden;(2) AstraZeneca R & D Lund, , 22187 Lund, Sweden |
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Abstract: | Solutions of n-nonyl-β-D-glucoside (C9G1), n-decyl-β-D-glucoside (C10G1), n-dodecyl-β-D-maltoside (C12G2), n-tetradecyl-β-D-maltoside (C14G2) and C9G1/C10G1 mixtures have been characterised by capillary viscometry and rheology in H2O and D2O, in order to map the influence of surfactant characteristics on micellisation over a wide concentration range. For the maltosides,
the micellar solutions are shear thinning with a zero-shear viscosity that scales with concentration according to a power
law with an exponent of about 5.8. In contrast, solutions of the glucosides C9G1, C10G1 and their mixtures show Newtonian flow behaviour and a much lower scaling exponent (<2.4). In C9G1/C10G1 mixtures, the scaling exponent decreases monotonously with increasing C10G1 content. The flow behaviour correlates with the packing requirements of the various surfactants, and are compatible with
the idea that the maltosides form worm-like micelles, whereas the glucosides form branched, interconnected micelles (C9G1) and space-filling micellar networks (C10G1). |
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Keywords: | Alkylglycosides Rheology Surfactant solution Micellar network Deuterium isotope effect |
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