Abstract
The pitch of weakly cholesteric mesophases obtained by dissolving a chiral compound in the nematic liquid crystal MBBA, has been determined by an EPR spin probe technique. The measured values are in excellent agreement with those obtained by the Grandjean-Cano microscopic method. Once a sufficiently large number of EPR simulated spectra have been computed, the experimental procedure for the determination of the pitch is shown to be faster and as reliable as other methods. The handedness of the mesophase can also be easily established by observing the spectral variations which follow the addition of a cholesteric of known handedness to a given sample.
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