Aqueous Mixtures of a Trisiloxane Surfactant and Oil Studied by SANS and NMR Self-diffusion: Effect of Temperature and Oil Concentration

作者：Walderhaug Harald^*; Knudsen Kenneth D

来源：Journal of Solution Chemistry, 2012, 41(2): 367-379.

DOI：10.1007/s10953-012-9796-5

• Neutron scattering
• PGSE-NMR
• Silwet L7607
• Water
• Decane

Samples of a poly(ethylene oxide) trisiloxane surfactant, water, and decane have been investigated using pulsed field gradient NMR (PGSE NMR) and small-angle neutron scattering (SANS) to determine the solution structure. The surfactant/water weight ratio has been kept constant at a value of 3/2, with variation of the oil (decane) content. In the neutron scattering measurements the temperature was varied from 23 degrees C up to the phase separation limit for these systems. The combined NMR and SANS data show that on addition of decane, the system exists as a hexagonal phase of cylindrical decane-containing micelles at all temperatures investigated. The addition of decane changes significantly the values for the structure parameters in the system, inducing an increase in periodicity of 12-15 angstrom. By substitution of decane with its deuterated equivalent, decane-d(22), it was possible to obtain detailed information on the structural organization of the oil component in this ternary mixture.

• 出版日期2012-3