APPLIED THERMAL ENGINEERING
·
2016
·
IF 3.043
Aihong Du,Huiwen Yuan,Wei Liao,Haobo Zhou,Chunhua Lu,Zhongzi Xu
Cost-effective thermal energy storage materials are vital to the application of solar thermal power plants . One focus of this paper is improving thermal and mechanical properties of the thermal energy storage materials; the second focus lies in reducing the investment cost. On the basis of aluminate cementitious composites with 1 wt% nano-SiO 2 , 1 wt% nano-Cu and 15 wt% Cu powders, we introduced different wt% (0, 5, 10, and 15) of Fe powders to gradually replace 15 wt% Cu powders. The samples were heated at 105, 350, and 900 °C, respectively. As a result, when the content of Fe powders substitution was 10 wt%, volume heat capacity, thermal conductivity and compressive strength of the composites after heat-treatment at 900 °C were up to 2.38 MJ m −3 K −1 , 1.45 W m −1 K −1 , and 73.8 MPa respectively, which were 26.6%, 26.1%, and 24.0% higher than those of the composites with 15 wt% Cu powders. At the same time, the investment of the composites with 10 wt% Fe powders substitution was reduced almost 62.0%, compared with that of the composites with 15 wt% Cu powders. In addition, XRD and MIP were employed to characteristic the mineral phases and the pore structures of the aluminate cementitious composites, respectively.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 24
·4417
·
IF 4.329
Xue Li,Ling Weng,Hebing Wang,Xiaoming Wang
To promote the construction of the thermal network in the epoxy resin (EP), a certain proportion of silver nanowires (AgNWs) coupled with the hexagonal boron nitride (BN) nanoplates were chosen as fillers to improve the thermal conductivity of EP resin. Before preparing the composites, BN was treated by silane coupling agent 3-aminopropyltriethoxysilane (KH550), and AgNWs was coated by dopamine hydrochloride. The BN/AgNWs/EP composites were prepared after curing, and the thermal conductivity and dielectric properties of the composites was tested. Results showed that the AgNWs and BN were uniformly dispersed in epoxy resin. It synergistically built a thermal network and greatly increased the thermal conductivity of the composites, which increased 9% after adding AgNWs. Moreover, the electrical property test showed that the addition of AgNWs had little effect on the dielectric constant and dielectric loss of the composites, indicating a rather good electrical insulation of the composites.Keywords:epoxy resin;boron nitride;silver nanowires;thermal conductivity
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Liwei Zhao,Xiangrong Shi,Yue Yin,Bo Jiang,Yudong Huang
Polymer dielectric composites with excellent thermal conductivity have received increasing attention in the modern electronics industry due to their outstanding thermal management performance. However, conventional polymers used for the thermally conductive composites usually suffer from accidental mechanical failure, causing decrease in service life or loss of functionality. In this work, we prepared a self-healing silicone/BN composite simultaneous with high thermal conductivity, high self-healing efficiency and low electrical conductivity . Silicone cross-linked by DA adduct was used as polymer matrix and BN was used as thermally conductive filler . The self-healing silicone/BN composite exhibited a high self-healing efficiency of higher than 90% and an enhancement of 544% in thermal conductivity at BN content of 50 wt%. The self-healing composites presented excellent thermal management performance. The excellent self-healing properties were attributed to the thermal reversibility of the DA reaction and the flexibility of the siloxane molecules. In addition, the self-healing silicone/BN composite with 50 wt% of BN exhibited a low dielectric dissipation factor of 0.017 and an enhancement of 568% in tensile strength .
研究领域:
材料科学
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高分子化学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 41
·21923-21932
·
IF 14.511
Zhenyu Wang,JianFeng Fan,Dongyi He,Linlin Ren,Zhifeng Hao,Rong Sun,Xiaoliang Zeng
Thermally conductive polymer-based composites with the combination of superior stretchability, efficient self-healing, recyclability and high thermal conductivity have long been pursued in the modern electronics industry. However, integrating these attractive properties remains challenging due to the complexity of the composite structure and composition. In this work, by fabricating covalent adaptable networks and introducing supramolecular interactions, we prepared a poly(thioctic acid)/aluminum (poly(TA)/Al) composite elastomer. The prevalent supramolecular interactions provide the poly(TA)/Al with enhanced interfacial interaction and a stretchable covalent adaptable network, leading to superior stretchability (1640%), enhanced thermal conductivity (1.83 W mK−1) and excellent self-healing efficiency (96% and 98% at 80 °C for tensile elongation and thermal conductivity, respectively). Moreover, the dynamically reversible covalent adaptable network ensures solid-state plasticity and thermally induced recyclability of the poly(TA)/Al, which can maintain desirable mechanical and thermal conductivity. The current work provides a practical method to design thermally conductive self-healing composites with stretchability and recyclability, which are needed for the heat dissipation of advanced electronic devices.
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
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Cui Xu,Xiao Jia,Jun Du,Feng Zhou,Bin Liu,Yamin Deng,Xiulan Huai
Thermally conductive structural adhesives (TCSAs) are rendered high requirements with the rapid development of electronic devices towards miniaturization, light-weight and electrically insulating performance. Improving heat dissipation capacity and mechanical properties are both critical for the application of TCSAs as the interconnected materials between chips and metal substrates. Herein, we prepared environment-friendly TCSAs with different hard segments (HS) contents by using castor oil-based polyurethane (PU) as matrix and alumina (Al 2 O 3 ) as thermal conductive filler through an extremely facile mechanical-mixing process. Impressively, the TCSA with 49.3% HS content exhibited an intense notable tensile stress of 8.6 MPa, a high elongation at break of 21%, and an excellent lap shear strength to different substrates, including organic glass (7.7 MPa), steel (9.5 MPa), cooper (10.3 MPa) and aluminum (14.2 MPa). Furthermore, the thermal conductive pathways in composites with 75 wt% Al 2 O 3 fillers endow its good thermal conductivity with thermal conductivity k of 1.23 W/(m·K), 4.7 times higher than that of pure PU ( k = 0.26 W/m·K). Overall, our fabricated TCSAs not only possessed superior mechanical performances but also high thermal conductivity, as well as showed great potential in thermal management application fields due to its simple and environmental fabricating method.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Xuebing Li
Phase change materials (PCMs) are increasingly popularized in the field of passive thermal management. However, several inherent defects such as strong rigidity, weak hydrophobicity and poor thermal conductivity have seriously hindered their widespread development. This work introduces a novel composite PCM with thermally-induced flexibility as well as enhanced hydrophobic and thermally conductive abilities, which is synthetized by physical melting and mixing of palmitic acid (PA), olefin block copolymer (OBC) and hexagonal boron nitride (h-BN). Experimental results demonstrate that OBC helps to realize flexibility and hydrophobicity, while h-BN is essential to spurring thermal conductivity growth but incapable of impairing surface wettability . 66.5 wt% PA, 28.5 wt% OBC and 5 wt% h-BN are convinced to be the appropriate formula of composite for the hydrophobic modification and the weighing between thermal conductivity and thermal storage capacity. The as-prepared flexible PCM reverses its surface wettability from hydrophilicity to hydrophobicity, accompanied by 27.0 % increment in water contact angle compared with the case of using only PA. The resultant also presents fine physiochemical compatibility, suitable phase transition parameters, and excellent thermal stability and reliability. Furthermore, highly reliable hydrophobicity is confirmed under four harsh conditions for prolonged application.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 9
·3797
·
IF 4.6
Song Xin,Zhiwen Zhao,Shangxiao Liu,Jiedong Liu,Mengya Li
Boron nitride nanosheet (BNNS) and graphene oxide (GO) as a single filler can effectively improve the thermal conductivity of the composites, and the synergistic mechanism of BNNS and GO was investigated in this paper. In this study, BNNS was first surface-functionalized and the multi-sized (50 nm, 200 nm, 500 nm) modified BNNS (A-BN) were attached to GO through non-covalent bonding interactions to form a cross-linked structure. Then, A-BN and GO were used as thermal fillers and support material adsorption eutectic phase change materials (PCMs) to prepare composite phase change material (CPCM). Characterization results show that small-size A-BN was more likely to form dense thermal networks with good compatibility and interface connectivity between PCMs, A-BN, and GO, ensuring that PCMs can be stored in the network without leaking. When the size of the BNNS was greater than 200 nm, the advantage of thermal conductivity obtained by A-BN was no longer obvious, and the phase change behavior of CPCM was inhibited. In general, the prepared CPCM has the ideal thermal response and thermal stability, which is very suitable for energy storage and thermal management applications.Keywords:phase change materials;boron nitride nanosheets;functionalization;thermal conductivity
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
PubMed
高影响因子
ACS Nano
·
2020
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IF 14.588
Yafang Zhuang,Kun Zheng,Xinyu Cao,Qingrui Fan,Gang Ye,Jiaxin Lu,Jingnan Zhang,Yongmei Ma
Achieving nanocomposites with simultaneous highly anisotropic thermal and electrical conductivities using carbon materials remains challenging as carbon material tends to form random networks in nanocomposites. Here, highly anisotropic and flexible graphene@naphthalenesulfonate (NS)/poly(vinyl alcohol) (GN/PVA) nanocomposites were fabricated using a layer-by-layer scraping method with flat graphene as the starting functional filler. NS acted as a bond bridge for linking the graphene (π–π interaction) and PVA (hydrogen bond). The results showed well-dispersed graphene in the nanocomposites while maintaining flat morphology with uniform in-plane orientation. The as-fabricated nanocomposites exhibited highly anisotropic thermal and electrical conductivities. The in-plane and out-of-plane thermal conductivities of the nanocomposite prepared with 10.0 wt % graphene reached 13.8 and 0.6 W m–1 K–1, and in-plane and out-of-plane electrical conductivities were 10–1 and 10–10 S cm–1, respectively. This indicated highly anisotropic thermal and electrical conductivities. Furthermore, the nanocomposites showed elevated flexibility and tensile strength from 42.0 MPa for pure PVA to 110.0 MPa for GN-5.0 wt %/PVA. In sum, the proposed strategy is effective for the preparation of nanocomposites with high flexibility, as well as superior anisotropic thermal and electrical conductivities.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 18
·4611
·
IF 3.1
Chuang Zhu,Minhao Xu,Baiyuan Tian,Manting Gu,Li Gong
The aim of this study is to further enhance the thermal storage and heat transfer performances of a low-melting-point quinary salt. The eutectic salt was prepared using LiNO3, NaNO3, KNO3, NaNO2, and KNO2as raw materials, followed by the doping of nano-SiO2and nano-MgO into the base salt using a microwave-assisted method. The thermal properties of the samples were analyzed using a Synchronous Thermal Analyzer and a Laser Flash Apparatus. The co-doping of two types of nanoparticles was found to significantly enhance the specific heat capacity of the base salt. The maximum specific heat reached 2.36 J/(g·K), showing a 50.4% increase compared to the base salt. The thermal conductivity of molten salts can be affected by nanoparticles. An observed sample demonstrated a thermal diffusivity of 0.286 mm2/s, indicating a 19.2% improvement over the base salt, which may be attributed to enhanced phonon thermal efficiency. In addition, this study revealed that while interfacial thermal resistance can enhance specific heat capacity, it can also lead to a decrease in the thermal conductivity efficiency of materials. This work can offer insights and references for the enhancement of molten salt properties.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Ruina Liu,Siming Zhao,Xueke Wu,Zhuojing Zhao,Kangkang Wang,Zhenyu Guo,Aike Xi,Fan Lan,Run Li,Ruihong Liu,Mengzhu Ma,Yonglu Zang,Fei Wang,Qinyuan Jiang,Yunrui Li,Pei Lyu,Rufan Zhang
Radiative cooling is an emerging zero-energy-consumption technology for human body cooling in outdoor scenarios during hot seasons. However, existing radiative cooling textiles are limited by low intrinsic cooling power, high hydrophobicity, and heat-insulating properties, which seriously impede a satisfying cooling effect, perspiration-wicking, and heat dissipation, thus limiting human thermal comfort in practical situations. Here, we developed a radiative cooling meta-fabric that was integrated with high perspiration-wicking and thermal conduction capacity. The meta-fabric included a polyoxymethylene (POM) nanotextile on the front side as a selective radiative emitter, a skin-friendly silicone on the reverse side as a thermal conductor, and patterned bamboo yarns (a cellulose fiber derived from bamboo with excellent hydrophilicity) as the water transport channels. As a result, the meta-fabric could rapidly wick away perspiration (within seconds) and had a high thermal conductivity of 1.5 W/(m·K), exhibiting high-performance human body cooling with a temperature of 10.9 °C lower than the meta-fabric without perspiration. Besides, even without perspiration, the meta-fabric still exhibited a temperature of 9.6 °C lower than commercial cotton fabrics. The work provides an alternative method to design smart textiles for personal thermal management in real applications.
研究领域:
材料科学
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纺织工程
·
热管理技术
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 22
·4006
·
IF 4.329
Qinlong Wang,Hao Wang,Caixia Zhang,Qilong Zhang,Hui Yang
High-frequency communication equipment urgently needs substrate materials with lower dielectric loss, better heat dissipation, and higher stability, to ensure real-time low-loss and high-speed signal transmission. The core-shell structure of Sr2CeO4@SiO2was prepared by the sol-gel method, and the modified powders with different volume contents were introduced into the cyclic olefin copolymer (COC) to prepare hydrocarbon resin-based composites. Due to the protective effect of the SiO2shell, the stability of the powders is significantly improved, and the moisture barrier and corrosion resistance of the composites are enhanced, which is conducive to the normal operation of electronic equipment in harsh and complex environments. When the filler content is 20vol%, the composite has a dielectric loss of 0.0023 at 10 GHz, a dielectric constant of 3.5, a thermal conductivity of 0.9 W·m−1·K−1, a water absorption of 0.32% and a coefficient of thermal expansion of 37.7 ppm/°C. The COC/Sr2CeO4@SiO2composites exhibit excellent dielectric properties and thermal conductivity, while maintaining good moisture resistance and dimensional stability, which shows potential application prospects in the field of high-frequency substrates.Keywords:polymer composite;dielectric loss;thermal conductivity;stability
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
Energies
·
2021
·Vol. 14
·期 5
·1403
·
IF 3.004
Lingyu Zheng,Xuelai Zhang,Weisan Hua,Xinfeng Wu,Fa Mao
Calcium ions can react with polyethylene glycol (PEG) to form a form-stable phase change material, but the low thermal conductivity hinders its practical application. In this paper, hydroxylated multi-walled carbon nanotubes (MWCNTs) with different mass are introduced into PEG1500·CaCl2form-stable phase change material to prepare a new type of energy storage material. Carbon nanotubes increased the mean free path (MFP) of phonons and effectively reduced the interfacial thermal resistance between pure PEG and PEG1500·CaCl23D skeleton structure. Thermal conductivity was significant improved after increasing MWCNTs mass, while the latent heat decreases. At 1.5 wt%, composite material shows the highest phase change temperature of 42 °C, and its thermal conductivity is 291.30% higher than pure PEG1500·CaCl2. This article can provide some suggestions for the preparation and application of high thermal conductivity form-stable phase change materials.Keywords:MWCNTs;form-stable phase change materials;PEG;thermal conductivity
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
危险品化学品经营许可证（带存储）