Physical Review Letters
Surfactant Micelles, Neutron Scattering, Water, System, Phase
We studied the effect of polyethylene-oxide (PEO, molecular weight from 10(5) to 4 x 10(6)) dissolved in the micellar nematic (N) and lamellar (L) phases of the surfactant system cesium perfluoro-octanoate (CsPFO)/water by microscopy and calorimetry. Replacement of water by PEO suppresses the lamellar phase above a critical concentration (w(c)) which depends on the molecular weight of the polymer by a power law. In a limited range below w(c) a reentrant nematic is observed. The N-L transitions become less sharp with increasing concentration. The observed effects are due to the disruption of the lamellar order by the polymer.
Kumar, Satyendra; Kuzma, M. R.; Wedler, W.; Saupe, A.; and Shin, S. (1992). Confinement Effects Induced By a Solubilized Polymer on the Micellar Nematic-Lamellar Transition. Physical Review Letters 68(23), 3436-3439. doi: 10.1103/PhysRevLett.68.3436 Retrieved from http://digitalcommons.kent.edu/phypubs/21