HEAT AND MASS TRANSFER
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2022
·Vol. 59
·期 5
·851-857
·
IF 2.325
Zhang Qian,Ma Fukun,Tan Wenjie,Liu Liqiang,Jing Min,Sun Tao
Inorganic hydrated salt calcium chloride hexahydrate (CaCl 2 ·6H 2 O) has a broad application prospect in the field of phase change energy storage due to its own characteristics. However, it has some problems such as large supercooling and serious phase separation, which limit its practical application. In this paper, boron nitride nanosheets (BNNSs) were applied in the CaCl 2 ·6H 2 O system. It was found that the heterogeneous nucleation of CaCl 2 ·6H 2 O can take place on the surface of BNNS. BNNS can solve the supercooling and heat transfer problems of CaCl 2 ·6H 2 O effectively. At the same time, the addition of an appropriate amount of BNNSs can improve the stability of phase change composites. Compared with pure CaCl 2 ·6H 2 O (supercooling was 22.06 °C and thermal conductivity was 0.382 W·m −1 ·K −1 ), the supercooling of CaCl 2 ·6H 2 O/1 wt% BNNS composite was only 3.89 °C and the thermal conductivity was 3.918 W·m −1 ·K −1 . CaCl 2 ·6H 2 O/0.5 wt% BNNS composite has good cycling stability. This study has scientific significance for the development and application of BNNSs in the field of phase change energy storage.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jing Peng,Wei Xia,Lifen Su,Yang Zhou,Ru Xia,Bin Wu,Jiasheng Qian,Lei Miao
Polymer thermally conductive composites have emerged as ideal materials to address the issue of heat accumulation in various electrical devices. However, the practical application of thermally conductive composites often requires low filler content with multifunctional properties to meet the rapid development of electronic technology. Herein, highly oriented carbon nanotubes (O-CNTs) were grown in situ on vertically aligned melem skeletons by ice templating and high-temperature catalytic methods. The ordered CNTs were constructed by a cross-linking network in the matrix of epoxy (EP) for efficient heat transport pathways. The oriented O-CNTs/EP composite exhibits outstanding out-of-plane and in-plane thermal conductivities as 2.36 and 1.20 W/(m·K) with a CNT content of 4 wt %, respectively. The O-CNTs/EP composite also shows an excellent electromagnetic shielding effect of over 30 dB in the range of 8–40 GHz. This work provides a promising strategy for the construction of high-performance composites with advanced heat dissipation in thermal management materials.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2024
·
IF 4.3
Zaifu Jin,JinHong Li,Jiaqing Zhao,Yixuan Ge
Thermal interface materials (TIMs), which consist of polymers and thermally conductive fillers, are crucial for improving heat dissipation. This study examines the impact of surface functionalization of Si₃N₄ thermal conductive fillers on the performance of TIMs. Si₃N₄ fillers are modified with silane coupling agents of varying alkyl chain lengths, producing fillers with contact angles ranging from 25° to 151.2°, thereby ensuring enhanced interfacial compatibility with various polymers. The modified fillers are incorporated into three common polymers—silica gel (SG), epoxy resin (EP), and polyurethane (PU)—to fabricate TIMs. When the contact angle of Si₃N₄ fillers is 73.3°, they demonstrate excellent interfacial compatibility with EP, leading to a 54.37% increase in thermal conductivity and a 162.75% enhancement in elongation at break for the TIM. At a contact angle of 132.7°, the TIMs prepared with SG exhibit an 86.36% increase in thermal conductivity and a 23.88% increase in elongation at break. Given that the original Si₃N₄ already possesses adequate interfacial compatibility with PU, no further modification is required. These findings offer valuable insights for future research aimed at optimizing Si₃N₄ fillers and TIMs to achieve enhanced thermal and mechanical properties.
研究领域:
材料科学
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热管理技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Haoxiang Lyu,Daili Feng,Yanhui Feng,Xinxin Zhang
Molten salt is considered as one of the most promising candidate materials for solar energy storage due to its consistent performance and high energy storage density . The limited thermal conductivity of molten salt, on the other hand, has become a bottleneck for efficient energy storage and heat transfer. Here, we propose a composite phase change material (PCM) to realize ultrafast thermal energy storage based on sodium nitrate (NaNO 3 ) doped graphene nanosheets (GNS). The thermal conductivity of the composite is improved by 245 % with GNS doping ratio of 3.0 wt%, which is due to better phonon vibration matching between GNS and NaNO 3 . The decrease of phase change enthalpy and melting point are explained from the perspective of mean square displacement. This paper provides a new idea for the selection criteria of the mass fraction of nano-enhancers for molten salt-based PCMs from the perspective of phonon vibration matching.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 15
·
IF 1.64
Wenman Guo,Guohua Chen
Ball milling is selected to prepare composites of graphene nanoplatelets (GNPs) and epoxy. Much enhanced thermal conductivity was recorded with higher GNP loading, which varied between 5 and 25 wt %. A maximum thermal conductivity of 2.67 W/m·K was found. The prepared composites were characterized by scanning electron microscopy, transmission electron microscopy, and Raman. It was found that KNG180, a commercially available kind of natural graphite, with a thickness of 30 ∼ 80 nm were mainly exfoliated into GNPs (<10 layers) with high quality, which were in turn uniformly dispersed in the composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40565.
研究领域:
材料科学
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热传导工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 10
·e53597
·
IF 3
Ying Zhu,Yumeng Luo,Xiran Tang,Lifen Tong,Xiaobo Liu
The intrinsic thermal conductivity coefficient of polyarylene ether nitrile (PEN) is low, which brings difficulty in meeting the need of advanced electronic equipment and microelectronic integrated circuit. In this research, h-BN was mixed into PEN as fillers in view of its remarkable thermal conductivity and electrical insulation, and the influence of filler content on properties in many aspects was studied in depth. The microcosmic arrangement and interfacial compatibility between fillers and matrix were studied by SEM. AR, DSC, TGA and hot-disk methods were performed to analyze thermal property. The results confirmed that thermal conductivity of composites was increased to 0.5444 Wm −1 K −1 at 30 wt% filler content, having 22.89% increment compared with PEN copolymer without addictive. Moreover, this PEN/h-BN composite shows excellent thermal properties with T g of 214.83°C, and T 5% of 535.09°C. Furthermore, the dielectric constant and insulation performance of composite with 30 wt% h-BN are improved, while the dielectric loss is kept low of 0.02 at 1 kHz. The tensile strength is 62.3 MPa and elastic modulus is 3567.5 MPa. In a whole, the 30 wt% h-BN/PEN composite prepared in this work exhibit great potentiality and promising prospect in the field of electronics.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Songji Li,Yunfeng Wang,Xueping Tang,Zhuo Chang,Ming Li
Thermochemical energy storage technology has been demonstrated to effectively address the challenges posed by the intermittent and volatile nature of renewable energy sources. This technology converts thermal energy into chemical energy through a chemical reaction. However, conventional adsorbents have shown suboptimal adsorption efficiency and inadequate thermal conductivity in thermochemical energy storage systems. This study proposes the use of an aluminum-based metal-organic framework as the solid adsorbent, with the initial product Al-Fum-Al 2 O 3 prepared by incorporating nano-Al 2 O 3 . The novel thermochemical energy storage material, LiCl@Al-Fum-Al 2 O 3 , was synthesized via the impregnation method. A systematic characterization of the material was conducted, encompassing its adsorption properties, thermophysical properties, adsorption-desorption kinetics, and stability. The addition of nano-Al 2 O 3 led to a significant improvement in the material's thermal conductivity. At a mass fraction of 13 wt% Al 2 O 3 , the composite exhibited a thermal conductivity of 0.21448 W·m −1 ·K −1 , which is 66 % higher than that of pure Al-Fum. Furthermore, encapsulating LiCl within the pore structure of Al-Fum-Al 2 O 3 led to a substantial enhancement in the thermochemical heat storage performance, with the heat of adsorption reaching 1185.22 kJ·kg −1 , representing an 85 % increase compared to the unmodified Al-Fum-Al 2 O 3 matrix. After completing 20 cycles of adsorption and desorption, the material demonstrated stable adsorption-desorption kinetics with minimal fluctuations in heat storage capacity. These findings underscore the promising potential of the synthesized aluminum-based MOF energy storage material for applications in thermochemical energy storage.
研究领域:
能源材料
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无机化学
·
热力学
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吸附技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Chao Ji,Ying Wang,Zhenqiang Ye,Liyuan Tan,Dasha Mao,Wenguang Zhao,Xiaoliang Zeng,Changzeng Yan,Rong Sun,Dae Joon Kang,Jianbin Xu,Ching-Ping Wong
High-performance thermal management materials are essential in miniaturized, highly integrated, and high-power modern electronics for heat dissipation. In this context, the large interface thermal resistance (ITR) that occurs between fillers and the organic matrix in polymer-based nanocomposites greatly limits their thermal conductive performance. Herein, through-plane direction aligned three-dimensional (3D) MXene/silver (Ag) aerogels are designed as heat transferring skeletons for epoxy nanocomposites. Ag nanoparticles (NPs) were in situ decorated on exfoliated MXene nanosheets to ensure good contact, and subsequent welding of ice-templated MXene/Ag nanofillers at low temperature of ∼200 °C reduced contact resistance between individual MXene sheets. Monte Carlo simulations suggest that thermal interficial resistance (R0) of the MXene/Ag–epoxy nanocomposite was 4.5 × 10–7 m2 W–1 K–1, which was less than that of the MXene–epoxy nanocomposite (Rc = 5.2 × 10–7 m2 W–1 K–1). Furthermore, a large-scale atomic/molecular massively parallel simulator was employed to calculate the interfacial resistance. It was found that RMXene = 2.4 × 10–9 m2 K W–1, and RMXene-Ag = 2.0 ×10–9 m2 K W–1, respectively, indicating that the Ag NP enhanced the interfacial heat transport. At a relatively low loading of 15.1 vol %, through-plane thermal conductivity reached a value as high as 2.65 W m–1 K–1, which is 1225 % higher than that of pure epoxy resin. Furthermore, MXene/Ag–epoxy nanocomposite film exhibits an impressive thermal conductive property when applied on a Millet 8 and Dell computer for heat dissipation.
研究领域:
材料科学
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热管理技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jingwei Chen,Xinqiang Wang
Three kinds of Gd 2 Zr 2 O 7 /ZrO 2 (GZC) composite fibers with different proportions of Gd 2 Zr 2 O 7 were prepared by electrospinning method through changing the amount of Gd 3+ in precursor solutions. The thermal decomposition, crystallization process , high temperature stability and heat-conducting properties of GZC fibers were fully characterized. The results showed that there were three crystalline phases, tetragonal phase ZrO 2 , cubic phase ZrO 2 and defect fluorite phase Gd 2 Zr 2 O 7 in all the GZC fibers. The content of Gd 2 Zr 2 O 7 increased gradually with the increase of Gd 3+ in precursor solutions which led to the gradual slowing down of grain growth rate, the decrease of thermal conductivity and the increase of high temperature stability of the obtained composite fibers. The thermal conductivities of all the GZC fiber sheets were lower than that of 7YSZ fiber sheet. The sheets of all the GZC fibers could keep the high temperature stability up to 1300 °C.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2025
·
IF 4.5
Li Lai,Muqiu Xia,Mengyu Fu,Yuanyuan Gao,Jiahao Sun,Guangzhou Liu,Shiqiang Chen
A micro-nano sharkskin like film (Cu-MNS-FA) was synthesized on copper surface through chemical etching followed by formate passivation, and its anticorrosive, antibacterial and thermal conductivity properties were investigated. Results show that after 7 d of exposure to nature, Pseudomonas aeruginosa and Desulfovibrio vulgaris seawater, the charge transfer resistance of Cu-MNS-FA is more than three times higher than that of unmodified copper. In particular, in D. vulgaris seawater, the R ct value of modified copper is 7 times higher than that of unmodified copper after the same exposure duration. The counts of sessile cells, specifically P. aeruginosa and D. vulgaris , on the surface of modified copper are reduced by more than 88 % after 3 days of immersion. Furthermore, thermal conductivity remains 10 % higher than that of untreated copper after 7 d of immersion. This film improves the performance characteristics of copper in seawater heat exchange systems.
研究领域:
材料科学
·
微生物学
·
海洋工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 27
·47726
·
IF 2.188
Xuhua He,Yuechuan Wang
Efficient heat dissipation from electronic devices with high-degree integration and high-power density has become an urgent and complex problem. We report here novel thermal greases with an enhanced thermal conductivity using graphene flakes (GFs), hexagonal boron nitride (h-BN), and hydroxypropyl cellulose (HPC) as fillers. The obtained GF/h-BN/HPC thermal grease at 23 vol % h-BN loading exhibits a thermal conductivity enhancement 555%, compared with the pure PDMS matrix, and also about 50, 169, and 115% higher than that with GF/h-BN, h-BN/HPC and h-BN as the filler for the thermal grease, respectively. We attribute it to the synergistic effects among GF, h-BN, and HPC, due to the formation of thermally conductive networks. This study provides a strategy for preparing thermal greases for thermal management applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47726.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2018
·
IF 5.16
Wancong Bian,Tong Yao,Ming Chen,Cheng Zhang,Tao Shao,Ying Yang
Epoxy resin has been widely used in electrical and electronics industries due to its excellent adhesion and insulating properties. However, the low thermal conductivity limits its application in the devices, especially under the working conditions of high frequency. In this work, the epoxy resin composites filled with binary fillers of dopamine modified micro-BN and KH550 modified nano-Al 2 O 3 were fabricated and the thermal conductivities, dielectric losses and breakdown strengths in high frequency and electrical field of the composites were studied. A high thermal conductivity of 1.182 W m −1 K −1 was realized in the composite with 22.5 wt% BN and 7.5 wt% Al 2 O 3 , which was about 700% higher than neat epoxy resin. The results of breakdown experiments in high frequency and high voltage field showed that the positive effect of the thermal conductivity increase was greater than the negative effect of the dielectric loss increase, and the notably improved breakdown time of the composite was 406% higher than that of neat epoxy. The epoxy resin composites with high thermal conductivity and excellent dielectric strength could be a potential insulating material in the electrical and electronics industries.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）