Order parameters of dye molecules in lyotropic nematic mesophases

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Abstract
The alignment in a magnetic field of two similar azo dyes in binary nematic lyotropic phases (C7F15CO2NH4 and C8F17CO2NH4 in D2O) has been studied. The order 5 parameter for the dyes was determined by measuring quadrupolar splittings (deuterium N.M.R.), the anisotropy of the electric conductivity and dichroism. The order parameter of the dye fixed in the disc-like perfluoro micelle with positive diamagnetic anisotropy was determined as a function of magnetic field strength, surfactant concentration, temperature and chain length. In addition the time constants for orientation and disorientation were determined.