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Electron Paramagnetic Resonance Studies of a Viscous Nematic Liquid Crystal

其他書名	Evidence Counter to a Second-order Phase Change
出版	National Aeronautics and Space Administration, 1972
URL	http://books.google.com.hk/books?id=8pujTdQlGz4C&hl=&source=gbs_api

註釋The ordering in a viscous, nematic, liquid crystal was studied using vanadyl acetyl acetonate and several nitroxides as paramagnetic probes. The ordering curve for VAAC at both K-band and X-band shows a slope discontinuity at a reduced temperature of 0.85. This discontinuity is caused by the tumbling time of the VAAC becoming comparable with the hyperfine splitting. The slope discontinuity is not present in the ordering curves of the nitroxides. The results are taken as evidence counter to the presence of a second-order phase transition.