Department of thermal properties
and structure of solids and nanosystems

The goal of the project: The creation of a comprehensive theoretical and empirical universal approach to the description of the thermal conductivity of solids based on experimental verification of the positions and predictions of the new quantum-field thermal conductivity theory Simoncelli-Marzari-Mauri (Nature Physics, 2019), and the establishment of universal analytical temperature dependence of the thermal conductivity of any (both amorphous and crystalline) solid.

(Head of the project - Prof. Krivchikov A.I.)
(2021-2023).

The goal of the project: 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.
(Head of the project - Prof. Krivchikov A.I.)
(2024-2026).

Study: "Low temperature heat capacity of expanded graphite"

The study's main goal is to identify regularities in the behavior of low-temperature heat capacity of solids in which an abnormal dispersion of one of the transverse acoustic branches in the dispersion law is observed.




(Project Team - Ph. D. О. Korolyuk)
(2022 - 2023)

Study: " Investigation of the Hall effect and electrical magnetoresistance of solid solutions in high magnetic fields up to 30 T"

Temperature dependences of electrical resistance of YBa₂Cu₃O₇–δ films were measured in magnetic fields up to 8 T. For the first time, within the framework of a local pair model, the evolution of the temperature dependence of the pseudogap Δ*(T) under the influence of a magnetic field was studied in detail. A significant increase in the size of local pairs under the influence of a magnetic field was revealed.
(Head of the project - Prof. Dolbin A.V.)
(2023-2026).

Study: "Platform for model based solutions to systemic complexity challenges: bridging leading research schools of Finland and Ukraine by Double Doctor Degree".
Visit of one staff member (Volodymyr A. Bedarev) from B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine to Lappeenranta-Lahti Univerisity of Technology. The field dependences of magnetization of doped Ca₃Y₂(BO₃)₄:Nd crystal were studied for temperatures T = 2K, 20K, 50K.


(Head of the project - Prof. Dolbin A.V.)
(2023 - 2025).

Study: "Universal behavior of low-temperature heat capacity of acrylonitrile-butadiene-styrene thermoplastic polymer and its composite with graphene oxide"
The low-temperature dependence of the heat capacity of ABS plastic and the influence of structural features were investigated. In particular, the influence of long-range structure disorder on the appearance of possible anomalies in its temperature dependence in the area of the existence of the Boson peak anomaly was found.


(Head of the project - Prof. Krivchikov A.I.)
(2022-2023).

Study: "Thermodynamic properties of materials containing hydrated fullerene inclusions at extra low temperatures"

The objective of this proposal was to verify and further explore the distinctive features identified in low-temperature heat capacity studies in low-dimensional carbon-based systems. These materials, including graphene oxide and fullerene, were of particular interest due to their unique structural and thermal properties.

(Head of the project - Ph.D. Romantsova. О.)
(2024-2024).

Study: "Thermal performance of low-dimensional diamond inclusions for carbon-allotrope based composites".

The aim of the planned STSM is to provide new experimental data and information on the low temperature properties of carbon-allotrope based composites. As a result of this research, important processes occurring in carbon-allotrope were determined, that are crucial for incorporation of the filler material in to the matrix of the future composites.

(Head of the project - Ph.D. Romantsova. О.)
(2024-2024).

Study: "Universal Temperature Dependence of the Diffusons Contribution to the Thermal Conductivity of Complex Clathrate-type Crystals"
Scientific studies of thermal properties have been carried out for samples different in material, method of preparation, etc., but having certain common characteristic. Experimental heat capacity studies were carried out for vapor deposited and melt-spun PdCuSi as well as poly(4-tert-butylstyrene) (PtBS) polymer and PtBS nanospheres.

(Head of the project - Ph.D. Romantsova. О.)
(2023-2023).

Study: "Low-temperature thermal properties of amorphous and crystalline solids"

The proposed project was intended to investigate thermal properties of composite systems consisting of epoxy with graphene oxide and its interesting features such as typical glassy properties. The inclusion of graphene oxide (GO) was also selected in order to investigate its effect on the temperature dependence of the heat capacity.

(Head of the project - Ph.D. Romantsova. О.)
(2024-2024).

Study: "Low-temperature heat capacity of benzene crystalline derivatives".

The primary objective of this proposal is to generate new experimental data on the low-temperature heat capacity of specially selected chloromethyl substituted benzene crystals, covering a temperature range from 2 to 300 K. Additionally, the study aims to investigate order-disorder phenomena in aromatic compounds composed of planar molecules.

(Head of the project - Prof. Krivchikov A.I.)
(2024-2024).

Study: "High-performance Carbon-based composites with Smart properties for Advanced Sensing Applications"
Main objective of the proposed STSM are experimental studies of low-temperature heat capacity, Raman and structural studies of composites consisting of exfoliated graphite and carbon nanotubes produced by chemical and electrochemical methods.This work is in collaboration with researchers from Institute of Physics in Kiev.

(Head of the project - Prof. Krivchikov A.I.)
(2023-2023).