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000863318 1001_ $$0P:(DE-HGF)0$$aFabozzi, Antonio$$b0
000863318 245__ $$aBranched alkyldimethylamine oxide surfactants: An effective strategy for the design of high concentration/low viscosity surfactant formulations
000863318 260__ $$aAmsterdam [u.a.]$$bElsevier$$c2019
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000863318 520__ $$aHypothesisThe rational design of branched-tail surfactants is a suitable strategy to obtain low-viscosity surfactant-rich isotropic aqueous mixtures with negligible effects on biodegradability. This opens a way to the design of concentrated (“water-free”) surfactant formulations, highly attractive for their ecological and economic benefits.ExperimentsThe aggregation behaviour of N,N-dimethyl-2-propylheptan-1-amine oxide (C10DAO-branched) in aqueous mixtures is investigated across the entire composition range by polarized optical microscopy, small angle X-ray and neutron scattering, electron paramagnetic resonance, and pulse-gradient stimulated echo nuclear magnetic resonance. The humidity scanning quartz crystal microbalance with dissipation monitoring technique is validated as a tool for the fast screening of surfactants phase behaviour. Furthermore, the shear viscosities and viscoelastic moduli of the systems are determined by rheological measurements.FindingsWith respect to the linear isomer, C10DAO-branched presents a much lower tendency to form lyotropic liquid crystalline phases. Except for a narrow composition and temperature range in which a lamellar structure is observed, C10DAO-branched aqueous mixtures are isotropic liquids whose microstructure changes, with increasing concentration, from micellar solutions to unstructured dispersions of hydrated surfactant molecules. Low-viscosity was found for all these mixtures, including the most concentrated ones. Thus, the introduction of a single short side-chain in the tail is demonstrated to be an effective approach to increase the active concentration in surfactant formulations.
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000863318 7001_ $$0P:(DE-HGF)0$$aRusso Krauss, Irene$$b1
000863318 7001_ $$0P:(DE-HGF)0$$aVitiello, Rosa$$b2
000863318 7001_ $$0P:(DE-HGF)0$$aFornasier, Marco$$b3
000863318 7001_ $$0P:(DE-HGF)0$$aSicignano, Luca$$b4
000863318 7001_ $$0P:(DE-HGF)0$$aKing, Stephen$$b5
000863318 7001_ $$0P:(DE-HGF)0$$aGuido, Stefano$$b6
000863318 7001_ $$0P:(DE-HGF)0$$aJones, Christopher$$b7
000863318 7001_ $$00000-0002-1105-4237$$aPaduano, Luigi$$b8
000863318 7001_ $$00000-0002-9986-0638$$aMurgia, Sergio$$b9$$eCorresponding author
000863318 7001_ $$00000-0001-6383-8618$$aD'Errico, Gerardino$$b10$$eCorresponding author
000863318 773__ $$0PERI:(DE-600)1469021-4$$a10.1016/j.jcis.2019.05.052$$gVol. 552, p. 448 - 463$$p448 - 463$$tJournal of colloid and interface science$$v552$$x0021-9797$$y2019
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