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Information × Registration Number 0224U033017, (0124U003840) , R & D reports Title Low-temperature quantum nanoscale effects in the thermal properties of compacted carbon materials and their composites popup.stage_title Ефект акустичних згинальних фононів на низькотемпературну теплоємність ущільнених матеріалів нанотрубок та розширеного графіту Head Oleksandr I. Kryvchikov, Доктор фізико-математичних наук Registration Date 16-12-2024 Organization B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine popup.description1 Creation of a comprehensive theoretical and empirical universal approach to the description of low-temperature thermal properties of densified carbon nanomaterials and composites based on them, which involves experimental verification of theoretical concepts for heterogeneous and densified anisotropic materials. The goal is to establish universal analytical temperature dependences of heat capacity and thermal conductivity for new modified carbon nanostructures. popup.description2  The aim of the project is to create a comprehensive theoretical and empirical universal approach to describing the low-temperature thermal properties of densified carbon nanomaterials and their composites. This involves experimental verification of theoretical concepts for heterogeneous and densified anisotropic materials, to establish universal analytical temperature dependencies of heat capacity and thermal conductivity for new modified carbon nanostructures. The following results were obtained at performing the SPI task: A unified strategy has been developed to detect the contribution of acoustic bending phonons to the low-temperature heat capacity. The contribution of acoustic bending phonons to the low-temperature heat capacity of expanded graphite material was investigated. Information about the contribution of acoustic bending phonons to the low-temperature heat capacity was obtained from experimental literature data on the heat capacity of densified carbon nanotube materials. A seminar was held on the topic "Heat Capacity and Thermal Conductivity of Solids at Low Temperatures". The results obtained within the framework of the project are important as they complement existing ideas about the low-temperature heat capacity of carbon nanomaterial systems. An empirically universal approach to the description of the low-temperature heat capacity and thermal conductivity of densified carbon nanomaterials and their composites is being developed, based on experimental verification of theoretical concepts for heterogeneous and densified anisotropic materials. Studies of the temperature dependence of the heat capacity of compacted nanotube samples and expanded graphite with different degrees of mechanical and thermal densification in the temperature range from 2 to 300 K allowed us to establish the effects in thermal properties associated with densification. A comparative analysis of literature data . Product Description popup.authors popup.nrat_date 2024-12-16 Close