TY  - JOUR
AU  - Fabozzi, Antonio
AU  - Russo Krauss, Irene
AU  - Vitiello, Rosa
AU  - Fornasier, Marco
AU  - Sicignano, Luca
AU  - King, Stephen
AU  - Guido, Stefano
AU  - Jones, Christopher
AU  - Paduano, Luigi
AU  - Murgia, Sergio
AU  - D'Errico, Gerardino
TI  - Branched alkyldimethylamine oxide surfactants: An effective strategy for the design of high concentration/low viscosity surfactant formulations
JO  - Journal of colloid and interface science
VL  - 552
SN  - 0021-9797
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - FZJ-2019-03398
SP  - 448 - 463
PY  - 2019
AB  - HypothesisThe 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:31151022
UR  - <Go to ISI:>//WOS:000481566500047
DO  - DOI:10.1016/j.jcis.2019.05.052
UR  - https://juser.fz-juelich.de/record/863318
ER  -