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- W2034759493 abstract "Abstract Measurements of the ultrasonic second harmonic amplitude in the nematic liquid crystal MBBA have been made at fundamental frequencies of 2, 5, and 10 MHz. It is found that the isentropic derivative of the sound velocity, which is related to the nonlinear coupling coefficient C, decreases by approximately 37% as temperature decreases from 35[ddot]C above to 20[ddot]C below the nematic to isotropic transition temperature, Tc, and may be discontinuous at Tc. In the nematic phase the coupling coefficient is found to be independent, within experimental error, of the angle between the ultrasonic wave vector and the nematic director. This confirms a previous result. Here, however, we are able to place a limit of at most a 4% change in C with a change in direction of propagation. From this value we calculate an upper bound of 10−11 dynes/cm2 for the isentropic derivative of the sound velocity anisotropy with respect to pressure." @default.
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- W2034759493 date "1976-07-01" @default.
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- W2034759493 title "Nonlinear Effects in Ultrasonic Propagation in a Nematic Liquid Crystal" @default.
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- W2034759493 doi "https://doi.org/10.1080/15421407708084304" @default.
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