Microstructures in aqueous solutions of a polyoxyethylene trisiloxane surfactant and a cosurfactant studied by SANS and NMR self-diffusion

Langmuir : the ACS Journal of Surfaces and Colloids
Harald Walderhaug, Kenneth D Knudsen

Abstract

Microemulsion samples of a polyoxyethylene trisiloxane surfactant, water, and 1-decanol are investigated using pulsed field gradient NMR and small-angle neutron scattering (SANS) to determine the solution structure. The surfactant/decanol weight ratio has been kept constant at values of 10:1, 8:1, and 6:1 under variation of water content. The temperature was 32 degrees C for the measurement series at the weight ratio of 10:1 to avoid phase separation at high water content. Also, aqueous surfactant solution samples have been investigated as a function of composition and temperature. Water-rich samples consist of micelles that are close to spherical at very low surfactant concentration and grow into anisometric, that is, oblate formed aggregates, at higher surfactant (or surfactant and decanol) concentration. The aggregates grow with increasing temperature, most probably due to dehydration of the hydrophilic groups. In a concentration range around 50 wt % water, the systems form bicontinuous structures. SANS data are used to estimate surfactant film properties using a model developed for interpretation of neutron scattering data from related systems.

References

Dec 21, 2000·Journal of Colloid and Interface Science·N GartiY Shaul
Nov 17, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·D ByelovD Richter

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Citations

Feb 26, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·S SettA L Yarin
Mar 22, 2015·Colloids and Surfaces. B, Biointerfaces·Chuanming HaoJunying Li
Nov 14, 2019·The Journal of Physical Chemistry. B·Maira FerreiraWatson Loh

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