Article
Chemistry, Physical
Shubhankar Sarkar, Nanda Kumar Ghosh
Summary: This study investigates the effect of temperature and Ag nanoparticles volume fraction on thermophysical properties such as thermal conductivity (TC), viscosity, and specific heat in Ethylene Glycol (EG) base fluid using molecular dynamics simulation. The results show that the diffusive qualities of nanoparticles relative to the fluid play a role in changing the characteristics of the fluid. The TC of the base fluid increases with temperature, and the enhancement of relative TC to the base fluid is due to the reduction of condensation around the nanoparticle. Viscosity increases with volume fraction but decreases with temperature. Non-linear increment of TC and viscosity with volume fraction is observed, consistent with different models. The study also investigates the mechanism of thermal conductivity enhancement through mean square displacement (MSD) calculation and the local structure and organization through radial distribution functions (RDFs).
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Indrajeet Mandal, Saswata Chakraborty, Manasi Ghosh, Krishna K. Dey, K. Annapurna, Amarnath R. Allu
Summary: This study investigates the factors influencing the movement of sodium cations in glasses and their impact on the conductivity. The results show that the mobility of sodium cations plays a significant role in enhancing the ionic conductivity. Additionally, inter-ionic Coulombic interactions and structural modifications also have a significant influence on the mobility and conductivity of sodium cations.
FRONTIERS IN MATERIALS
(2022)
Article
Physics, Multidisciplinary
Ho Khac Hieu, Nguyen Phuoc The, Huynh Ngoc Toan, Dang Thanh Hai, Vu Van Hung
Summary: Isotopic effects in solid neon have been studied using the statistical moment method, considering the anharmonicity of lattice vibrations. Calculations were performed for 20Ne and 22Ne isotopes using the Lennard-Jones potential. The results show good agreement with path-integral Monte Carlo simulations and previous experimental data.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Nguyen Thi Hong, Ho Khac Hieu
Summary: The anharmonic Debye model was developed in this study to investigate the Debye temperature and thermal disorder in Fe-Cr intermetallic alloys. The results show that the Debye temperature of Fe-Cr systems increases gradually with increasing Cr composition, while the mean-square displacement curve decreases with Cr concentration. Thermal disorder contributes significantly to mean-square displacement at high temperatures due to thermal lattice vibrations.
Article
Materials Science, Ceramics
Chenyang Xiao, Jialiang Li, Bo Duan, Houjiang Yang, Hongtao Wang, Ling Zhou, Guodong Li, Pengcheng Zhai
Summary: In this study, p-type CoSb3 materials filled with electronegative guest Cl were successfully prepared by HPHT process without charge compensation. The Cl filler exhibited p-type electron acceptor behavior and increased the hole concentration of CoSb3. Additionally, the Cl-filled skutterudites showed significantly reduced lattice thermal conductivity due to enhanced scattering of point defect, rattler, and grain boundary.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Condensed Matter
Yangyang Ma, Shu Yang, Wenxin Dong, Kaihua He
Summary: This study investigated the electronic structure, thermal expansivity, and lattice thermal conductivity of CaO2 and CaO3 compounds formed by Ca and O at high pressure using first principles. The results showed that all three compounds are semiconductors, with the properties varying with the number of O atoms. The thermal expansivity followed the order of CaO3 > CaO2 > CaO, while the lattice thermal conductivity exhibited the opposite order.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Oussama Bindech, Roberto Marquardt
Summary: The quantum mechanical evaluation of mean square displacement of a free particle's position using thermal Gaussian wave packets is discussed. The approach covers both continuum and periodic boundary conditions, with analytical expressions obtained for the latter case.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Materials Science, Multidisciplinary
Ho Khac Hieu, Hoang Linh Nguyen, Nguyen Phuoc The, Huynh Ngoc Toan, Tran Thi Hai
Summary: This study investigates the thermodynamic quantities of face-centered cubic ytterbium metal using the statistical moment method in statistical mechanics. By considering the anharmonicity of lattice vibrations, this approach allows for the calculation of these quantities. Numerical calculations in the temperature range from 0 K to 1100 K are conducted using the Lennard-Jones potential to describe the interaction between ytterbium atoms. The results are compared with mean-field potential approach and previous experimental data, showing good agreement.
Article
Chemistry, Inorganic & Nuclear
Joao Elias F. S. Rodrigues, Javier Gainza, Federico Serrano-Sanchez, Mateus M. Ferrer, Guilherme S. L. Fabris, Julio R. Sambrano, Norbert M. Nemes, Jose L. Martinez, Catalin Popescu, Jose A. Alonso
Summary: Skutterudite-type compounds filled with different elements show improved thermoelectric performance by reducing thermal conductivity, but the mechanism affecting bulk moduli does not come from lattice expansion.
INORGANIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Zhongding Fan, Le Li, Zhenghao Chen, Makoto Asakura, Chi Zhang, Zhigang Yang, Haruyuki Inui, Easo P. George
Summary: The temperature-dependent yield strengths of [123]-oriented single crystals of four quinary non-equiatomic CrMn-Fe-Co-Ni high-entropy alloys (HEAs) were investigated. The critical resolved shear stress (CRSS) exhibited a rapid decrease from 10 K to 300 K, followed by a slower decrease and a plateau above 873 K. The yield strength at cryogenic temperatures was positively correlated with Cr content.
Article
Chemistry, Inorganic & Nuclear
Jesus Prado-Gonjal, Paz Vaqueiro, Radoslaw M. Kowalczyk, Ronald I. Smith, Anthony V. Powell
Summary: Lithium was incorporated as a filler in Co1-2xFexNixSb3 skutterudite compounds through intercalation at 60℃, using n-BuLi as a reducing agent. The presence of lithium in the product phases was confirmed by solid state Li-7 NMR and ICP-MS analysis, which also provided an estimation of the lithium content. The intercalation of lithium resulted in reductions in thermal conductivity and electrical resistivity, as well as an increase in the figure of merit.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Materials Science, Multidisciplinary
Chao Yong, Ying Lei, Rui Liu, Yu Li, Lei Tao, Feng Gao, Jin Qiu, Yinghui Liu, Huaichuan Hu
Summary: Nearly single-phase Yb-filled and Te-doped YbxCo4Sb11.5Te0.5 were prepared by microwave and further densified by spark plasma sintering. The experimental results show that Yb filling and Te doping significantly improve the electrical properties and reduce the lattice thermal conductivity. The maximum power factor of Yb0.2Co4Sb11.5Te0.5 is 4364.45 mu Wm- 1K-2 at 675 K. Analysis suggests that the resonance scattering from Yb filling and the defect scattering and stress field fluctuation introduced by Te doping effectively limit the thermal transport performance. The total thermal conductivity of Yb0.2Co4Sb11.5Te0.5 is 2.68-3.74 Wm-1 K -1 in the temperature range of 300-775 K, and the maximum ZT is 1.25 at 775 K, indicating that Yb filling and Te doping improve the electrical properties and reduce the thermal conductivity by limiting the mean free path of phonons.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Physics, Applied
Un-Gi Jong, Chol Ryu, Chung-Jin Kang, Chol-Jun Yu
Summary: In this study, the thermoelectric performance of ternary metal phosphide CaAgP was investigated using first-principles calculations. The accurate description of phonon-phonon and electron-phonon interactions was achieved, resulting in good agreement with experimental transport properties. The potential enhancement of thermoelectric performance through nano-phasing or doping was suggested.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Analytical
Jiaxing Gong, Yaowen Zhang, Hui Zhang, Qi Li, Guangbin Ren, Wenjian Lu, Jing Wang
Summary: This study utilizes optical vortex dynamics to detect the dynamic process of blood coagulation in a rapid and non-contact manner. The results demonstrate the feasibility of the optical vortex method in monitoring blood coagulation, and its correlation to traditional methods in measuring coagulation parameters. This method is also applicable to measuring the viscoelasticity of complex fluids and turbid soft matters.
Article
Mathematics, Applied
Monika Muszkieta, Joanna Janczura, Aleksander Weron
Summary: The ongoing rapid development in single particle tracking techniques has enabled new possibilities for analyzing particle dynamics inside living cells. By assuming that the motion is governed by a fractional Brownian motion, a synthetic video resembling a real one was generated from experimental video data of G-proteins and receptors inside living cells. The Brownian bridge method was then applied to study segmentation and classification tasks on trajectory data, showing that the results obtained may vary significantly depending on how missing data is handled, ultimately impacting the final conclusions.
APPLIED MATHEMATICS AND COMPUTATION
(2021)