Rajewska Aldona
2010
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Abstract
Three nonionic classic surfactants C10E7 (heptaethylene glycol monodecyl ether) and C12E7 (heptaethylene glycol monododecyl ether) and C14E7 (heptaethylene glycol monotetradecyl ether) in water solutions were investigated for concentration c = 0.5% (dilute regime) at temperatures t = 6°, 10°, 15°, 20°, 25°, 30° and 35° C with two methods—tensiometric and small‐angle neutron scattering ( SANS ) on SANS diffractometer “Yellow Submarine” at Budapest Neutron Center, Budapest ( Hungary ) and SANS spectrometer (“YuMO”) of the IBR‐2 on pulsed neutron source at FLNP, JINR in Dubna ( Russia ). Measurements have covered Q range from 8 10−3 to 0.4 A−1. The micellar solutions were prepared in D2O since the contrast between the micelles and the solvent in neutron experiments is better with D2O than with H2O. It was obtained as the result that the shape of micelles changes depending on surfactant concentration and temperature. At lower concentrations and temperatures micelles are ellipsoids but at higher concentration...