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.
Physical Review Letters
Copyright 1992 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.68.3436.
Kumar, Satyendra; Kuzma, M. R.; Wedler, W.; Saupe, A.; Shin, Sung-Tae (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 https://oaks.kent.edu/phypubs/21