Article
Multidisciplinary Sciences
Zhongtao Lin, Wuguo Liu, Shibing Tian, Ke Zhu, Yuan Huang, Yang Yang
Summary: By using Raman spectroscopy, the thermal expansion coefficients of suspended MoS2 and supported MoS2 were investigated, showing significant differences. Additionally, negative thermal expansion coefficients were observed in MoS2 below 175K, which is attributed to bending vibrations in the layer during cooling. This study demonstrates that Raman spectroscopy is a useful tool in exploring the thermal properties of few-layer MoS2 for potential application in photoelectronic devices.
SCIENTIFIC REPORTS
(2021)
Article
Spectroscopy
Weihong Xue, Bo Dai, Kuan Zhai, Haipeng Song, Wen Wen, Shuangmeng Zhai
Summary: In this study, the Raman spectra and thermal expansion of MgP2O6 metaphosphate were investigated. The results showed that temperature has an effect on the Raman active vibrations and unit cell parameters of MgP2O6, but no temperature-induced phase transition was observed. The thermal expansion coefficient of MgP2O6 was estimated to be 3.21(2) x 10(-5) K-1, and there is an axial anisotropic thermal expansion.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Multidisciplinary Sciences
Michal Delkowski, Christopher T. G. Smith, Jose V. Anguita, S. Ravi P. Silva
Summary: Future space travel requires lightweight and robust structural materials that can withstand extreme conditions and multiple entries into orbit. Current inorganic materials cannot meet these requirements. Carbon fiber reinforced polymers (CFRPs), although highly stable, have limitations due to environmental instabilities and electrostatic discharge. To improve space travel and structural engineering, a more robust and improved CFRP is needed. In this study, a superlattice nano-barrier-enhanced CFRP with a density of approximately 3.18 g/cm³ is presented. The composite exhibits enhanced radiation resistance and electrical conductivity, while maintaining ultra-dimensional stability even after temperature cycles.
Article
Engineering, Geological
Zi-jun Feng, Yang-sheng Zhao, Dong-na Liu
Summary: The research shows that the permeability of granite increases with temperature, with coarser-grained granite exhibiting a more significant increase in permeability. Factors such as grain size, temperature, and elastic modulus have a significant impact on thermal cracking and induced permeability.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Jolly Joy, Salil Nair, Sharad Babu Pillai, K. D. Patel, G. K. Solanki, V. M. Pathak, Prafulla K. Jha
Summary: The present work highlights the growth and analysis of temperature and laser power-dependent Raman spectra of Co incorporated WSe2 crystals. The study provides confirmation of the crystal structure, morphological characteristics, and elemental composition of the crystals. The non-linear temperature dependence of the Raman modes and the thermal conductivity of the samples are quantitatively analyzed. The research sheds light on the anharmonic behavior of phonons in WSe2 and Co0.5W0.5Se2 crystals.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
C. Bray, K. Maussang, C. Consejo, J. A. Delgado-Notario, S. Krishtopenko, S. Gebert, I. Yahniuk, S. Ruffenach, K. Dinar, J. Eroms, K. Indykiewicz, B. Jouault, J. Torres, Y. M. Meziani, W. Knap, A. Yurgens, S. D. Ganichev, F. Teppe
Summary: This article presents extensive experimental studies on the zero-field splittings in monolayer and bilayer graphene. Surprisingly, a decrease of the spin splittings with increasing temperature was observed. The origin of this phenomenon is discussed by considering possible physical mechanisms likely to induce a temperature dependence of the spin-orbit coupling.
Article
Chemistry, Physical
Lin Huang, Yongjian Zhou, Tingwen Guo, Dong Han, Yu Gu, Cheng Song, Feng Pan
Summary: This study investigates the correlation between magnetic properties and thermal expansion in cold-drawn Fe-36Ni wires, finding that the variation trend of magnetic properties is consistent with that of thermal expansion and is influenced by heat treatment. Differential thermal analysis shows that crystalline transitions may cause abrupt changes in magnetic properties and thermal expansion coefficient.
Article
Engineering, Multidisciplinary
Yuan Chen, Lin Ye, Y. X. Zhang, Chunhui Yang
Summary: This study investigates a novel multi-material topology optimization scheme considering temperature-dependent thermoelastic properties for engineering structure design. Results show that the temperature-dependent elastic modulus dominantly influences design outcomes, while the temperature-dependent thermal expansion coefficient plays a crucial role in material distribution and structural geometry.
ENGINEERING OPTIMIZATION
(2022)
Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Energy & Fuels
Hongwen Yu, Yuanhui Li, Guanglei Cui, Derek Elsworth, Jianpo Liu, Mingfei Liu
Summary: The study introduces a nested spherical mechanical model to address deficiencies in prior models of microwave-assisted rock fracturing. The distribution of stress is found to be uniquely linked to thermal stress coupling coefficients and the geometric dimensions of the three zones. Maximum tensile stress is observed at the inner boundary of the T zone or a short distance from the H zone.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Chemistry, Multidisciplinary
Yin-Chen Jiang, Sheng Sun, Tong-Yi Zhang
Summary: The Gruneisen formula plays a key role in linking mechanical and thermal properties of materials, and in this study, the dependence of the Gruneisen parameter on film thickness and temperature was investigated for the first time using theoretical modeling and MD simulations. Two analytic expressions of a thickness and temperature-dependent Gruneisen parameter were obtained, with differences in quadratic or linear dependence on temperature, and confirmed through MD simulations on FCC Ni, Cu, and Au thin films. The study also explored the thickness and temperature-dependent film heat capacity density.
Article
Construction & Building Technology
Guojun Sun, Mingze Wu, Xiushu Qu, Suduo Xue
Summary: This study focuses on the mechanical properties, thermal expansion performance, and thermal deformation performance of ethylene tetrafluoroethylene (ETFE) membrane at different temperatures. Experimental results provide information regarding the mechanical properties, glass transition temperature, coefficient of thermal expansion (CTE), and thermal deformation strain model of ETFE at various temperatures. The thermal deformation mechanism is proposed to be the sum of thermal expansion strain and elastoplastic strain caused by changes in the strain-stress relationship.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Said Elmarhoum, Komla Ako
Summary: The viscosity of alpha-carrageenan solutions is higher than that of x-carrageenan solutions. The thermal expansion behavior of alpha-carrageenan and x-carrageenan is also different. The expansion coefficient of alpha-carrageenan is higher than that of x-carrageenan.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Engineering, Electrical & Electronic
Zhan Wang, DeLi Chen, XianChao Yang, SiXiang Liang, XiaoHong Sun
Summary: This article proposes and investigates a temperature sensor of SNCS fiber structure coated with PDMS. PDMS is used to increase the thermal expansion coefficient of NCF and improve the temperature sensitivity of the sensor due to its large thermal expansion coefficient and negative thermal optical coefficient. The temperature sensitivity of the sensor is -260 pm/°C. Both experimental and theoretical results show good agreement. The advantages of simple manufacture, low cost, strong resistance to environmental impact and mechanical damage make it suitable for various scenarios.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Zhongya Zhang, Chuncheng Wei, Ruixiang Liu, Yun Wu, Daoqian Li, Xuefei Ma, Lanyong Liu, Peng Wang, Yishan Wang
Summary: Experimental and theoretical analyses showed that the graphite interface layer had a greater impact on the thermal shock resistance of laminated ZrB2-SiC ceramics, mainly due to its higher thermal conductivity and smaller difference in thermal expansion coefficient.
CERAMICS INTERNATIONAL
(2021)
