Davi A. Oliveira, Antonio J. Palangana e Lia Q. Amaral

MOLECULAR CRYSTALS AND LIQUID CRYSTALS – Volume: 576; Issue: 1; Pages: 71-75; DOI: 10.1080/15421406.2013.789702

Measurements of optical refractive indices (ordinary and extraordinary), as a function of temperature, are reported for the heavy water / SDS molar ratio Mw = 36, with a decanol / SDS molar ratio Md = 0.324. The nematic biaxial phase emerges from the crystal phase (which occurs below 18°C) into a coexistence region with two uniaxial nematic phases (discotic ND and cylindrical NC), before entrance in the NC phase. The transitions are discontinuous, and the biaxial phase differs from the coexistence region ND + NC. Results indicate changes of the micellar object with temperature, and at the phase transitions.