Low-temperature behavior and hysteresis of heat capacity in CNTs are determined by structural disorder
Alexander N. Ponomarev1, Nadezhda G. Bobenko1, Valeriy E. Egorushkin1; 1 Institute of Strength Physics and Materials Science of Siberian Branch Russian Academy of Sciences, Tomsk, Russia
Abstract
Carbon nanotubes (CNTs) have a wide range of thermal properties determined by the structure of the material. The surface of carbon nanotubes consists of graphene crystallites. Their size, orientation, and density of intercrystallite boundaries determine the structural disorder of nanotubes. Crystallites can have a domain structure of the armchair-zigzag type, formed in the process of obtaining tubes. We have proposed a mechanism for the formation of a domain structure and studied its influence on the temperature behavior of the heat capacity, the appearance and magnitude of hysteresis. The dependences of the heat capacity and its temperature hysteresis on structural disorder revealed for CNTs will be useful in the development of thermoelectric, thermal interface materials, nanofluids, and materials with thermal memory based on them.
Speaker
Alexander Ponomarev
ISPMS SB RAS
Russia
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