THERMOCHIMICA ACTA
·
2016
·
IF 1.938
X.K. Gao,X. Wen,H. Zhou,Q. Zhu,J.L. Wang,X.Y. Li
In this work, a novel and simple method was put forward to measure the isobaric specific heat capacity for the kerosene RP-3 with a flow-calorimeter at the conditions of high temperature and high pressure. Based on the energy conservation principle, the formula for heat capacity was derived and its measurement was realized by the convective mixing method between the hot and cold fuel. Taking the precision of the instrument and the error transfer into account, the relative expanded uncertainty of this method was acquired of about ± 6.38% (coverage factor k = 2). Meanwhile, the accuracy and reliability were verified by the standard material of water and n -decane. In the temperature range from (296.2–719.0) K and under pressure range from (2.4–4.0) MPa, the measurement for the kerosene RP-3 was carried out and the experimental observations were compared and agreed well with the published data. At last, an empirical correlation relationship of heat capacity due to the temperature and pressure was presented by using Garg’s model with the measured experimental data.
研究领域:
物理化学
·
能源工程
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-8
·
IF 3.998
Chang Chao,Wang Zongyu,Fu Benwei,Ji Yulong
Solar energy as an abundant renewable resource has been investigated for many years. Solar thermoelectric conversion technology, which converts solar energy into thermal energy and then into electricity, has been developed and implemented in many important fields. The operation of solar–thermal–electric conversion systems, however, is strongly affected by the intermittency of solar radiation, which requires installation of thermal storage subsystems. In this work, we demonstrated a new solar–thermal–electric conversion system that consists of a thermoelectric converter and a rapidly charging thermal storage subsystem. A magnetic-responsive solar–thermal mesh was used as the movable charging source to convert incident concentrated sunlight into high-temperature heat, which can induce solid-to-liquid phase transition of molten salts. Driven by the external magnetic field, the solar–thermal mesh can move together with the receding solid–liquid interface thus rapidly storing the harvested solar–thermal energy within the molten salts. By connecting with a thermoelectric generator, the harvested solar–thermal energy can be further converted into electricity with a solar–thermal–electric energy conversion efficiency up to 2.56%, and the converted electrical energy can simultaneously light up more than 40 orange-colored LEDs. In addition to stable operation under sunlight, the charged thermal storage subsystem can release the stored heat and thus enables the solar–thermal–electric system to continuously generate electricity after removal of solar illumination.
研究领域:
能源科学
·
材料科学
·
可再生能源技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yiqi Dong,Lindai Sun,Yujie Guo,Jianping Xu,Zheyu Jin,Zhongwei Wang,Wenkui Zhang,Yang Xia,Hui Huang,Xinhui Xia,Jun Zhang
Space cooling and heating consume huge energy resources globally, while existing cooling/heating equipment can only address indoor temperature control. In this work, we report a multifunctional layered Janus-coated fabric (JCF) with radiative cooling/solar heating/Joule heating, which can utilize space and the sun as a source of cooling and heating. By adjusting the reflectivity, emissivity, and absorptivity of the coating, the fabric performs a thermal management function in a complex and changeable environment without consuming energy. In cooling mode, the cooling layer achieves a high solar reflectivity of 96% and an infrared emissivity of 96%, resulting in a 3.1 °C reduction in ambient temperature without any convective shielding. In addition, it reduces temperatures by 1.6 °C on human arms and by 5.1 °C inside houses, respectively. In the heating mode, the heating layer demonstrates excellent light-to-heat conversion efficiency under direct sunlight, achieving a 13.3 °C radiation warming ability, 16 °C heating effect on the surface of the arm, and a 12.8 °C temperature increase in the house. Furthermore, when switched to active heating for temperature regulation, JCF exhibits fast electrical response, high-efficiency electrical heat conversion capability, and stable electrical heat circulation capability. Building energy simulations indicate that widespread deployment of JCF across China could lead to a reduction in cooling and heating energy consumption by more than 25 MJ/m2 in 80% of cities. This multifunctional Janus-coated fabric not only provides a viable engineering path for the practical application of radiative heat management technology but also demonstrates its potential applications in human thermal comfort, smart wearable and building energy efficiency.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhiqi Li,Zhihao Wang,Xiaofei Ma,Shenglan Xiang,Wei Wen
High-entropy rare-earth oxide ceramics offer great potential for thermal barrier coatings (TBCs) due to their tunable thermal expansion coefficients (TECs) and low thermal conductivities. In this study, a series of high-entropy rare-earth zirconia-ceria ceramics, (La 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Y 0.2 ) 2 (Zr 1-x Ce x ) 2 O 7 (x = 0, 0.125, 0.25), were synthesized and characterized. The samples are denoted as 5RZ (x = 0), 5RZC1 (x = 0.125), and 5RZC2 (x = 0.25), where "5 R" refers to the five rare-earth elements, "Z" to Zr, and "C" to Ce. The research systematically investigates both the evolution of the phase structure and its influence on physical properties. The study found that the 5RZ sample with appropriate dual-phase ratios inhibits grain growth by clamping the grain boundaries, thus maintaining the fine grain structure. Owing to this property, 5RZ displays a low thermal conductivity of 1.730 W·m −1 ·K −1 at 800 °C. While in the fluorite phase dominated 5RZC1 and 5RZC2, the phonon scattering and defect scattering effects bring about a reduction in thermal conductivity to 2.216 W·m −1 ·K −1 , and 1.599 W·m −1 ·K −1 , respectively. Meanwhile, the TECs decrease gradually with the increase in the proportion of the fluorite phase, from 11.52 × 10 −6 K −1 for 5RZ to 11.10 × 10 −6 K −1 for 5RZC2. Additionally, 5RZ, 5RZC1, and 5RZC2 also exhibited higher hardness (10.52 ∼ 12.05 GPa) and fracture toughness (1.46 ∼ 1.50 MPa·m 1/2 ). The research results reveal the evolution and regulation mechanisms of the dual-phase structure, providing both theoretical basis and practical guidance for the tunable design of thermophysical and mechanical properties in TBCs.
研究领域:
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2025
·
IF 2.2
Hao Xu,Lin Chen,Jiang Tian,Baihui Li,Luyang Zhang,Jiankun Wang,Jing Feng
High-entropy ceramics (HECs) are widely studied to boost the properties of various materials, based on the high-entropy effects and high disorders in ionic radius and atomic weights. To further optimize the properties of RETaO 4 (RE is rare-earth) as thermal barrier coatings (TBCs), a diatomic site high-entropy engineering is applied to increase their disorders, subsequently boosting their thermophysical properties. Four RETaO 4 HECs are designed and synthesized in this work, including (Gd 1 ∕ 5 Dy 1 ∕ 5 Ho 1 ∕ 5 Er 1 ∕ 5 Y 1 ∕ 5 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (5HECs-1), (Gd 1 ∕ 5 Dy 1 ∕ 5 Ho 1 ∕ 5 Er 1 ∕ 5 Yb 1 ∕ 5 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (5HECs-2), (Gd 1 ∕ 6 Dy 1 ∕ 6 Ho 1 ∕ 6 Er 1 ∕ 6 Yb 1 ∕ 6 Y 1 ∕ 6 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (6HECs-1), and (Gd 1 ∕ 6 Dy 1 ∕ 6 Ho 1 ∕ 6 Er 1 ∕ 6 Yb 1 ∕ 6 Lu 1 ∕ 6 ) (Ta 1 ∕ 2 Nb 1 ∕ 2 ) O 4 , (6HECs-2). It shows that the thermal conductivity (1.41–1.59 W ⋅ m − 1 ⋅ K − 1 , 9 0 0 ∘ C) is reduced, while thermal expansion coefficients are improved ( TECs = 1 0 . 4 4 – 1 0 . 8 7 × 1 0 − 6 K − 1 at 1 4 0 0 ∘ C), which are better than their single-RE ceramics. Furthermore, Young’s modulus is proportional to their A -site ionic radius, and RETaO 4 HECs have higher modulus than single-RE RETaO 4 and RENbO 4 ceramics. Accordingly, the diatomic site high-entropy engineering is effective in boosting the thermophysical properties of RETaO 4 , and this strategy can be tried in various oxide ceramics.
研究领域:
材料科学
·
热物理工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Longkang Cong,Wei Li,Jiancheng Wang,Shengyue Gu,Shouyang Zhang
Thermal barrier coating (TBC) materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine. In this study, a novel high entropy hafnate (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 was synthesized by solution combustion method and investigated as a potential TBC layer. The as-synthesized (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 possesses a pure single disordered fluorite phase with a highly homogeneous distribution of rare earth (RE) cations, exhibiting prominent phase stability and excellent chemical compatibility with Al 2 O 3 even at 1300 °C. Moreover, (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 demonstrates a more sluggish grain growth rate than Y 2 Hf 2 O 7 . The thermal conductivity of (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 (0.73-0.93 W m −1 K −1 ) is smaller than those of components RE 2 Hf 2 O 7 and many high entropy TBC materials. Beside, the calculated thermal expansion coefficient (TEC) of (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 (10.68 × 10 −6 /K, 1100 °C) is smaller than that of yttria-stabilized zirconia (YSZ). Based on the results of this work, (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 is suitable for the next generation TBC materials with outstanding properties.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Weilong Chen,Kun Wu,Bingfei Nan,Mangeng Lu
Thermal conductivity (TC) of polymers can be enhanced by incorporating rigid conjugated structures, which will result in sacrifice of other characteristics such as flexibility. To deal with such problem, a series of polyesters (PEmC) with long methylene units in main chains were synthesized by polycondensation and transesterification . A sharp increment of 219.7% in TC was observed and the maximum TC reached to 0.227 Wm −1 K −1 , which is twice that of traditional thermoplastic . It is intriguing that thermal diffusivity for above samples changed few while specific heat capacity of PEmC increased from 0.620 J g −1 K −1 to 1.470 J g −1 K −1 on elongating the length of flexible methylene segments in main chains. Thus TC in this system was mainly enhanced by enhancing specific heat capacity. Due to flexible segments in main chains, Young modulus of PEmC (around 0.2 GPa) is one order of magnitude lower than that of conventional thermoplastic. Moreover, PEmC exhibited good performance both in maintaining flexibility below glass-transition temperature and preserving modulus above glass-transition temperature, which might be remarkable in potential application for flexible electronics.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Da-Shun Zhang,Zhi-Cheng Tan,Bei-Ping Liu,Xiao-Bing Huang
Neodymium complex with glycine, Nd(Gly) 2 Cl 3 ·3H 2 O, was synthesized and characterized by IR spectra. The thermal stability of the complex was tested through TG and DTG and a possible mechanism of thermal decomposition was proposed. The heat capacities of the complex were measured by using an automated adiabatic calorimeter over the temperature range from T = (80 to 380) K, the thermodynamic functions, [ H T − H 298.15 ] and [ S T − S 298.15 ], were calculated based on the heat capacity measurements. Two (solid + solid) phase transitions in the ranges of T = (170 to 247) K were observed with the peak temperatures of 184.896 K and 231.217, respectively. The standard molar enthalpy of formation of [Nd(Gly) 2 Cl 3 ·3H 2 O] was determined to be (−3081.3 ± 1.1) kJ · mol −1 in terms of an isoperibol solution-reaction calorimeter.
研究领域:
物理化学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Xuewei Luo,Lirong Luo,Xiaofeng Zhao,Huangyue Cai,Shuaishuai Duan,Chunhui Xu,Shuo Huang,Hongyun Jin,Shuen Hou
Emerging of high-entropy ceramics has brought new opportunities for designing and optimizing materials with desired properties. In the present work, high-entropy rare-earth zirconates (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 O 7 and (Yb 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 O 7 are designed and synthesized. Both high-entropy ceramics exhibit a single pyrochlore structure with excellent phase stability at 1600 °C. In addition, the Yb-containing system possesses a high coefficient of thermal expansion (10.52 × 10 −6 K -1 , RT∼1500 °C) and low thermal conductivity (1.003 W·m -1 K -1 , 1500 °C), as well as excellent sintering resistance. Particularly, the Yb-containing system has significantly improved fracture toughness (1.80 MPa·mm 1/2 ) when compared to that of lanthanum zirconate (1.38 MPa·mm 1/2 ), making it a promising material for thermal barrier coatings (TBCs) applications. The present work indicates that the high-entropy design can be applied for further optimization of the comprehensive properties of the TBCs materials.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 141
·期 2
·783-796
·
IF 2.471
Ding Jiong,Yu Liming,Wang Xiaona,Xu Qiyue,Yang Suijun,Ye Shuliang,Jiang Juncheng
The accelerating rate calorimetry is a powerful tool for thermal hazard evaluation. However, the existing kinetics approaches ignore the fact that the thermal inertia is varying during the pseudo-adiabatic reaction because of the changing of the sample’s heat capacity and heat loss. To overcome this shortcoming, the expression of the thermal inertia is amended based on the heat balance and transfer in this article. The arithmetic product of the sample’s heat capacity and the amended thermal inertia is obtained by merging the kinetic results of the DSC and ARC data. Then, the data from the ARC are corrected and the more reasonable values of the kinetic parameters are computed based on the varying thermal inertia consideration. With the typical n -order and autocatalytic decomposition experiments under the different sample masses, the validity of the proposed kinetic approach is verified. Meanwhile, the hypotheses of the proposed approach are analyzed and discussed in the end of the article.
研究领域:
化学工程
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Lin Chen,Mingyu Hu,Jun Guo,Xiaoyu Chong,Jing Feng
As candidate thermal/environmental barrier coatings (T/EBCs), the structure characteristics and comprehensive properties of monoclinic-prime (m') RETaO 4 (RE = Yb, Lu, Sc) with excellent Al 2 O 3 /SiO 2 chemical compatibility are studied. Excellent thermal insulation protection will be provided by m'RETaO 4 due to their low thermal conductivity (∼1.6 W m −1 K −1 , 900 °C) and prominent thermal radiation resistance, which is much better than those of YSZ (∼2.5 W m −1 K −1 , 1000 °C) and La 2 Zr 2 O 7 (∼2.0 W m −1 K −1 , 900 °C). The thermal expansion coefficients (TECs) are 3.0–8.0 × 10 -6 K −1 (200−1200 °C), which is suitable for T/EBCs applications. Furthermore, absence of phase transition and extraordinary chemical compatibility with Al 2 O 3 /SiO 2 up to 1500 °C indicate the potential application prospect. The documented governing mechanisms of m'RETaO 4 properties will enable researchers to promote their application in the future investigation.
研究领域:
材料科学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2022
·Vol. 9
·期 7
·1911-1920
·
IF 15.717
Limei Zhang,Kun Jia,Jiao Wang,Jiayou Zhao,Jingda Tang,Jian Hu
Transparent heaters (THs) are widely used for various applications, such as in smart windows, deicers, defoggers, displays, and thermotherapy pads. The rapid development of flexible electronics has led to a demand for flexible and even stretchable THs. At present, most stretchable THs are designed using a combination of electronically conductive networks and flexible polymer materials. Electronic THs still face common challenges, such as a transparency-conductance trade-off, non-uniform heating, and poor interfacial adhesion. In this work, an ionic TH is reported based on a stretchable and transparent ionogel. Joule heating from an ionic current induced by alternating voltage functions as the heating source. This ionogel-based TH exhibits excellent and steady mechanical, optical, electrical, and thermal properties, simultaneously solving the abovementioned three problems relating to electronic THs. Two simple applications of this ionogel-based TH are demonstrated: deicing and boiling water. This reported ionogel-based TH provides a new material choice and heating principle to compete with conventional electronic TH technology.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）