13 June 1997 Temperature increment induced by magnetic field in some nematics
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Proceedings Volume 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications; (1997) https://doi.org/10.1117/12.276263
Event: Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, 1996, Szczyrk, Poland
Abstract
We have observed that the temperature changes in nematic mesophases change as a result of magnetic fields. This phenomenon has been considered as a result of ordering produced by the interface and magnetic field. In this work analogous experiments carried out for three nematics compounds: PAA, MBBA, EBBA are described. The magnetic field used was B equals 0.2T. For all these compounds the temperature rises were observed, but the shape of the temperature characteristics of temperature changes was different for al the cases. We explain this phenomenon as a result of anisotropy of thermal conductivity, existing in nematics. When the magnetic field is applied to a nematic sample, the molecules are ordered along the field, so the anisotropy of the thermal conductivity takes place. In this situation the heat transport from the heater to the thermocouple was better and the temperature measured was higher. The interpretation was tested by the measurements on MBBA at the room temperature. When both the nematic sample and the heater are a the same temperature no heat generation at the magnetic field has been detected.
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Marek Wojciechowski, Marek Wojciechowski, Przemyslaw Adamski, Przemyslaw Adamski, Mariusz Panak, Mariusz Panak, "Temperature increment induced by magnetic field in some nematics", Proc. SPIE 3181, Dielectric and Related Phenomena: Materials Physico-Chemistry, Spectrometric Investigations, and Applications, (13 June 1997); doi: 10.1117/12.276263; https://doi.org/10.1117/12.276263
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