JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 9
·3829-3838
·
IF 3.5
Li Jing,Meng Yuanchao,Li Ning,Miao Jianyin,Li Wenjun,Yu Yinghao
Highly integrated and high-power devices place higher demands on the heat dissipation capability of heat sink components, and graphene meets the heat dissipation requirements due to its extremely high thermal conductivity of 5300 Wm −1 K −1 and good mechanical properties. Graphene by redox is one of the most promising methods for large-scale preparation of graphene; however, the quality of graphene prepared by different reduction processes varies. Herein, this paper presents a fast and efficient reduction process. Benzene was added as a reduction aid to increase the temperature from room to 2000 °C in 30 s and complete the reduction process. By this method, we obtained graphene with low defects and high thermal conductivity. The reduction process restored the lattice destroyed by the oxidation process, and the repaired material showed a higher crystallinity with a measured I D /I G of 0.18 (Ph-rGO-0, 0.58) and in-plane thermal conductivity of 510 ± 10 Wm −1 K −1 . The in-plane thermal conductivity was increased by 262 Wm −1 K −1 compared with the film without benzene addition (Ph-rGO-0), which showed better homogeneous temperature performance and heat dissipation performance in practical applications. These results show the great potential for the application of graphene films prepared by this method in the field of heat dissipation materials.
研究领域:
材料科学
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纳米技术
·
热管理
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenjie Li,Yuncong Jiang,Hang Liu,Chen Wang,Xiaodong He,Fei He,Mingwei Li
It is an effective method to predict thermal conductivity of porous materials by using fractal models. In this work, mullite fibers/whiskers hierarchical porous materials (MFWs) were prepared via in-situ growth method. The fractal dimension was obtained by calculating the microstructure photo after binarization according to the box-dimension method. Based on fractal theory and fractal dimension, improved Sierpinski carpet models were established. The models were then converted into electrical fractal patterns to solve the iterative formulas of effective thermal conductivity ( K eff ) and porosity. The results show that K eff decreases gradually with the increase of porosity. The thermal conductivity of the solid phase has a significant effect on K eff at low porosity. Pore size and its spatial distribution, especially the spatial distribution of the larger pore, have a substantial impact on K eff , and the smaller and uniformly distributed pore can reduce K eff , effectively. The calculated results are close to the experimental results, suggesting that the fractal model is suitable for predicting the thermal conductivity of MFWs. More crucially, the calculated results have guiding significance for the experimental preparation, and it is possible to reduce the thermal conductivity of MFWs by increasing whiskers length and growing efficiency.
研究领域:
材料科学
·
热物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Jiahong Xiang,Li GuangMing,Zhenbang Zhang,Tao Chen
This study introduces the fabrication of dual-layer composite nanofiber membranes incorporating AG80 (tetrafunctional epoxy resin), BN (boron nitride), and PI (polyimide) through electrospinning, with the aim of overcoming the limitations of conventional polyimide (PI) materials in thermal management and electrical insulation for flexible circuit boards. Although PI is recognized for its mechanical strength, chemical stability, and insulating properties, its low thermal conductivity, brittleness, and complex processing challenges limit its broader application. By precisely controlling the composition of AG80, BN, and PI, and optimizing electrospinning parameters, we successfully developed a nanofiber membrane that exhibits enhanced thermal stability and insulation properties. The resultant membrane demonstrates remarkable flexibility, retaining mechanical integrity after 10,000 bending cycles, and achieves a high thermal conductivity of 1.42 W/m·K. Optimized porosity further enhances surface adhesion, rendering it ideal for high-performance flexible circuit boards. These findings provide valuable theoretical and practical insights for the design and development of advanced flexible electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2024
·
IF 2.8
Yuxuan Chen,Wanlin Xu,Mengyi Wang,Xiong Zheng
Thermal conductivity is a very important thermal property parameter in the process of hydrocarbons transportation, storage, combustion and cooling. Therefore, accurate thermal conductivity is important in the utilization of hydrocarbons. In this work, the thermal conductivity of n-hexane and n-heptane in the temperature range of 298.15 K∼523.15 K and pressure range of 0.1 MPa∼15.0 MPa was studied by using transient hot-wire method. In order to facilitate engineering application, function polynomials of temperature and pressure are fitted and correlated with experimental data. The average absolute error of the experimental data and fitting data of n-hexane and n-heptane are 0.72 and 0.61 %, respectively, which proves that the function polynomial can describe the experimental data well. In addition, we compare the collected literature data with our results and find that the literature data is very close to our results. This work is expected to expand the range of available data on the thermal conductivity of n-hexane and n-heptane and contribute to the industrial applications of these two substances.
研究领域:
热物理学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wenchao Lin,Pengrong Ren,Yuhui Wan,Shu Yang
BaTiO 3 , Ba(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , SrTiO 3 , Sr(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 , (Sr 0.5 Ba 0.5 )TiO 3 and (Sr 0.5 Ba 0.5 )(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Nb 0.2 )O 3 ceramic samples were prepared using a traditional solid-state reaction method. XRD analysis shows that all the samples are a single-phase perovskite structure. After the addition of B-site high-entropy components Sn 4+ , Zr 4+ , Hf 4+ , and Nb 5+ in BaTiO 3 , the permittivity and dielectric loss decrease significantly, and the temperature stability of the permittivity is remarkably improved. Compared with the undoped sample, the insulation resistance of the high-entropy ceramic sample increases exponentially. The incorporation of high entropy components changes the conduction mechanism, improves the insulation performance, and significantly decreases thermal conductivity, which improves the adiabatic performance of ceramics. These results demonstrate that the high entropy strategy can significantly influence the electrical and thermal properties of BaTiO 3 and SrTiO 3 -based ceramics. Our work provides a new idea for the modification of functional ceramic materials and offers new promising candidates of dielectrics applied for Class-I type ceramic capacitors.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
An Huang,Yanqiong Bao,Houpei Li,Yu Liu,Xiong Zheng,Guangzhao Qin
Binary mixtures of ethylene glycol and water are widely used as working fluids in many areas, and the study of thermal conductivity is crucial in the determination of the heat transfer properties of related systems. In this paper, the thermal conductivity of these binary mixtures at a series of ethylene glycol concentrations (0 to 100 wt%) is measured experimentally using a transient hot-wire system at evaluated temperature and pressure range from 293–533 K and 0.1–15.0 MPa. Moreover, the experimental data are fitted into an equation as a function of temperature, pressure, and concentration, the average absolute deviation and maximum deviation between fitted values and experimental data are 0.29 % and 1.05 %, respectively, which shows that this equation describes our data very well. Furthermore, available experimental data in the literature are collected and the comparisons between literature data and our data are analyzed, our data agree well with most literature data. This work is expected to promote the use of binary mixtures of ethylene glycol and water as heat transfer working fluids in industries.
研究领域:
工程热物理
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化学工程
✓ 已验证
DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2025
·
IF 3.9
Yuan Baocheng,Wen Yi,Wang Lei,Li Zhihao,Wang Hong-Chao,Chang Cheng,Zhao Li-Dong
Thermoelectric materials possess tremendous potential in energy regeneration owing to their capacity to produce power directly from heat. SnTe, a lead-free compound, is a prospective thermoelectric material. However, because of its elevated thermal conductivity, the thermoelectric performance of undoped SnTe remains at a low level. In this work, we induce ternary compounds CuFeS 2 into the SnTe matrix by ball milling. We observe the decomposition of CuFeS 2 , which decomposes into FeS, Cu 2 S, and other binary compounds. These newly generated binary compounds form micropores and secondary phases in the matrix. Combined with the natural grain boundaries in the polycrystal, they form all-scale hierarchical structures within the material, resulting in reduced lattice thermal conductivity. Overall, the produced SnTe + 2 wt% CuFeS 2 composites show the peak dimensionless figure of merit ( ZT ) up to 0.33 at 673 K, an increase of ~ 100% compared to the undoped SnTe.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Lei Cao,Lin Liu,Kaiyi Luo,Pingping Qian,Haowen Chen,Yixiao Deng,Lei Yang,Xiaoyong Wu,Jun Tang
Skutterudites (SKDs) are promising thermoelectric (TE) materials due to their cost-effectiveness and favorable electrical properties. However, their high thermal conductivity limits thermoelectric conversion efficiency. Herein, Y 2 O 3 nanoparticles (NPs)-decorated n-type Yb 0.3 Co 4 Sb 12 were prepared by spark plasma sintering (SPS). The heterointerfaces created by Y 2 O 3 nanoparticles enhance charge carrier localization through O-Sb hybridization and O-Co bonding, which increases the Seebeck coefficient. Additionally, heterointerfaces scatter phonons, reducing thermal conductivity. Consequently, a figure of merit ( ZT ) value of ∼1.48 at 773 K and an average ZT ave of ∼1.0 (293 ∼ 823 K) were achieved in this work.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2014
·
IF 2.086
T. Li,Z. Ma,L. Liu,S.Z. Zhu
Rare-earth zirconate is one of the most promising candidate materials for the next generation thermal barrier coatings . However, at high temperatures the thermal conductivity of the rare-earth zirconate increases because of radiation. NiCr 2 O 4 , which can absorb the infrared photons intensely, was introduced to reduce the radiative thermal conductivity of Sm 2 Zr 2 O 7 . NiCr 2 O 4 and Sm 2 Zr 2 O 7 powders were prepared by coprecipitation method. The bulks of Sm 2 Zr 2 O 7 – x vol% NiCr 2 O 4 ( x =0, 5, 10, 15 and 20) composites were prepared by non-pressure sintering. The phase, microstructure and composition of the samples were characterized. The absorptivity and the thermal conductivity of the composites were also tested. The absorptivity of the composites was enhanced as increasing the content of NiCr 2 O 4 . The total thermal conductivities of the composites were higher than that of pure Sm 2 Zr 2 O 7 , but the recovery of the thermal conductivity of rare-earth zirconate was relived or disappeared in the testing temperature range.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Weihua Meng,Yuying Song,Ke Zhai,Hang Di,Haiyun Ma,Xue Bi,Jianzhong Xu,Lide Fang
Phytic acid (PA)-modified MXene (P-MXene) was prepared combination selective etching with assemble method, and was mixed with epoxy resin (EP) to investigated its flame retardancy, thermal conductivity, conductivity and mechanical properties. P-MXene exhibited two-dimensional single layer structure and had good char-forming property with 86.7% char residue at 800 °C. The cone calorimetry test results showed that P-MXene endowed EP with excellent flame retardancy. Compared with pure EP, the peak heat release rate, peak smoke release rate, peak CO generation rate, and peak CO 2 generation rate of EP composites with 2 phr P-MXene decreased by 38.6%, 31.6%, 38.7% and 40.6%, respectively. The flame retardant mechanism was attributed to physical barrier, catalyzing carbonization effect, oxidative thermal degradation and physical barrier effect. Additionally, the conductivity and mechanical properties of EP composites were slightly reduced. This work provides a promising method to design multifunctional polymers.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Weizhun Jin,Linhua Jiang,Lin Han,Haimeng Huang,Jianfeng Zhang,Mingzhi Guo,Yue Gu,Fangfang Zhi,Zhiyou Chen,Guohui Yang
New nanofluids based on graphene (GR) and GR/MXene were prepared to enhance the thermal conductivity. The thermal conductivity and viscosity of nanofluids at various temperatures in the 5–60 °C range were tested, and their stability was investigated by zeta potential and visual observation. The thermal performance of the nanofluids was evaluated through numerical simulation analysis. The results demonstrate that MXene can effectively improve the dispersion stability of GR nanofluids. The nanofluid with 2.0 wt% GR at 60 °C exhibited the maximum thermal conductivity enhancement (65.34%) but also the maximum viscosity increment (70.69%). With the addition of MXene, the high thermal conductivity of nanofluids was maintained while the viscosity significantly decreased. GR can greatly improve the heat transfer efficiency of nanofluids, and the temperature at the monitoring point resulted from 2.0 wt% GR decreased by 9.19 ℃ compared to water. The heat transfer efficiency of GR/MXene nanofluids was almost identical to that of GR nanofluids.
研究领域:
材料科学
·
热力学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hao Zhao,Baoyin Xu,Zhanhui Ding,Yanfeng Xue,Jing Yang,Wei Zhao,Yongfeng Li,Bin Yao,Hongdong Li,Yucheng Lan
Bismuth telluride is a widely used commercial thermoelectric material with excellent thermoelectric performances near room temperature. Reducing thermal conductivity is one of the most effective ways to improve performances of thermoelectric materials. In this study, the thermal conductivity of the material was reduced by fabricating porous structures. Highly dense NaCl-(Bi,Sb) 2 Te 3 composites were fabricated by a high-pressure technology. The NaCl phase was then removed from the composites by ultrasonic washing to produce porous structures. The produced (Bi,Sb) 2 Te 3 porous materials possessed excellent thermoelectric properties. The porosity and pore size of the (Bi,Sb) 2 Te 3 porous materials increased with the increasing NaCl content, decreasing the thermal conductivity significantly. An ultra-low lattice thermal conductivity of 0.21 Wm −1 K −1 at 493 K was achieved when the porosity was 39%, almost the lowest lattice thermal conductivity reported for (Bi,Sb) 2 Te 3 bulk materials. The figure of merit ZT value was enhanced to 1.05 at 493 K when the porosity was 25%. Compared with the most compacted samples ( ZT = 0.79 and porosity of 10%) prepared under the same conditions, the ZT value of the porous samples increased by 33%. This study indicated that porous thermoelectric materials can be prepared simply, quickly and efficiently by high-pressure/ultrasonication washing to improve thermoelectric performances, which has evident reference values for preparing other thermoelectric pore materials with enhancing behaviors.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
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