ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiaofang Li,Meng An,Peide Li,Jianwen Miu,Qiang Wu,Fenghua Zheng,Juantao Jiang,Hongqiang Wang,Youguo Huang,Qingyu Li
Developing highly efficient thermal management techniques is crucial in order to achieve the best performance of electronic equipment. Here, a delocalized conjugated system was established by the conjugation of sp2 orbitals in phenylamine groups and a delocalized big π bond in graphene to construct an electron thermal conduction route. Then, the abundant π electrons in graphene can be transferred to the adjacent copper unimpededly, leading to a remarkable thermal conductivity. These results demonstrate that the copper substrate deposited with phenylamine-functionalized graphene (PA–Gr–Cu) shows a high thermal conductivity of 506 W m–1 k–1, which is 30.8 and 44.2% higher than those of the pristine graphene–copper composite (Gr–Cu) and copper (Cu), respectively. Placed on a heat source heated from 30 to 210 °C within 5 min, the top surface temperature of PA–Gr–Cu increases to 198 °C rapidly, whereas those of Gr–Cu and Cu only increase gently to 88 and 59 °C. This work demonstrates that phenylamine with a pair of lone electrons in the N atom shows superiority as an intermediate molecule to link graphene and copper to establish a delocalized conjugated system. This innovation provides another solution to establish a conjugated structure between graphene and copper to construct an electron thermal conduction route with remarkable thermal conduction properties and will promote the research on the electron thermal conduction route for graphene-based metal matrix composites in the application of thermal dissipation.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Songfeng E,Yuan Wang,Yuanming Wang,Jiaming Yang,Junli Ma,Kaiyue Huang,Zhangzi Li,Zhaoqing Lu,Lejia Wang
We discovered that incorporating the Ca 2+ into sodium alginate (SA) solution as ball-milling medium of hexagonal boron nitride ( h -BN) could increase the lateral size of the exfoliated h -BN nanosheets (BNNSs) at least twice those of pure SA solution obtained, which can be owing to the Ca 2+ −induced crosslinking of SA and enhancement of interfacial adhesion forces between SA and h -BN that not only boost the impacting resistance to milling balls but also the exfoliation energy to h -BN. Based on the crucial role of Ca 2+ in h -BN exfoliation, the large-area and small-thickness BNNSs are produced simultaneously with the increased milling speed and Ca 2+ concentration, which can be assembled into highly compact and horizontal oriented structures with aramid nanofibers (ANFs) due to the favorable compatibility, dispersity, and interfacial binding force. This kind of compact and ordered structure enables ANF/BNNS film with high thermal conductivity (TC) since the connective and high-efficiency heat conduction paths, of which the highest TC is 27.57 W⋅m −1 ⋅K -1 . Compared with soft and molecular SA chains, the ANFs show an incredible ability to guide the horizontal orientation of BNNSs for the superior TCs of their composites.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chenglong Cai,Ting Wang,Yixin Zhang,Nongyue He
A macro-scopic ensembles of graphene was considered to be very important for their extensive use. A macro-scopic ensembles of graphene was considered to be very important for their extensive use. Such as electromagnetic-interference shielding, thermal control and sensor. In this work, we developed a facile one-step strategy for ultra-large neat graphene oxide (UN-GO) film with excellent thermal conduction and photothermal conversion property. A Langmuir Blodgett was used as the reactor for self-assembling aqueous graphite oxide (GO) suspensions onto the glass slice to form UN-GO film. The wrinkling density and degree of the close-packed flat UN-GO monolayer were determined by the size of GO sheets. The defect on UN-GO film 2D structure determined the thermal conductivities of the close-packed flat UN-GO. To avoid defect on UN-GO film 2D structure, we modified the substrate with different concentration of (3-aminopropyl) triethoxysilane (APTEs). The internal structure of self-assembled monolayers (SAMs) of APTES fabricated on a glass substrate determined the defect of UN-GO film. Flat APTES-SAMs with integrated molecular structure was a determinant for UN-GO film to form 2D structure with rare defect. Graphene on the top of the substrate was 4 layers. With rare detect on 2D structure, thermal conductivity of GO film reached at 2514 W m −1 K −1 . One-step process will be with a high potential for large scale production.
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
High Voltage
·
2025
·Vol. 10
·期 1
·219-227
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IF 4.9
Zeyu You,Ling Weng,Lizhu Guan,Xiaorui Zhang,Zijian Wu,Hao Chen,Wei Zhao
Epoxy resin (EP), as a resin material with excellent insulation performance, has been widely applied in fields such as electronics, coatings, ships etc. However, epoxy resins generally have poor thermal conductivity, which limits their application in the field of new generation of electronic packaging. To address the key issues mentioned above, the BN@Fe 3 O 4 particles with positive out-of-plane thermal conductivity were successfully prepared in this study, having a core-shell structure with rough surfaces as well. As a thermal conductive powder, the disadvantage of hexagonal boron nitride being easily agglomerated in resin has been improved. By applying an external magnetic field, three-dimensional thermal conduction pathways were constructed in the matrix. The physical and chemical properties of the BN@Fe 3 O 4 powder and its composite materials were analysed and tested. The experiment indicates that the thermal conductive magnetic powder BN@Fe 3 O 4 had been successfully prepared. When the filling amount of BN@Fe 3 O 4 reached 27.5 vol%, the out-of-plane thermal conductivity of the composite material was 1.758 W m −1 K −1 , which was 982.12% that of pure EP. At this point, the mechanical behaviour and insulation performance of EP composite materials can be effectively guaranteed at the same order of magnitude as pure EP performance.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yong Luo,Yuhui Xie,Hao Jiang,Ying Chen,Li Zhang,Xinxin Sheng,Delong Xie,Hua Wu,Yi Mei
Phase change materials (PCMs) are promising candidates for enhancing the efficiency of solar thermal energy utilization owing to their excellent capacity of storing thermal energy. However, the issues of leakage, poor thermal conductivity, and high flammability have hindered their application. Here, we have successfully designed and prepared flame-retardant PCMs through chemical modification of stearyl alcohol (SAL) with a phosphorus-containing molecule. Form-stable phase change composites were then fabricated through a vacuum impregnation method, where an MXene with a porous architecture serves as the supporting skeleton for PCMs. As expected, benefiting from the high aspect ratio and strong capillary force of the MXene aerogel as well as the interfacial interaction between the PCM molecule and MXene, the resulting MXene-based PCMs (PSM-4) exhibit a large thermal conductivity (0.486 W m −1 K −1 ) and are form-stable upon heating up to 90°C. Additionally, the combination of phosphorus and MXene further strengthens the flame retardancy of PCMs, e.g., the peak heat release rate and total heat release are reduced by 42.8% and 32.1%, respectively. The improvement of flame retardancy can be assigned to the catalytic charring and barrier effect in the condensed phase as well as to the effect of free radical quenching in the gas phase. Hence, the obtained MXene-based flame-retardant PCMs can be potentially utilized for safe and efficient applications of solar energy storage.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2019
·
IF 4.026
Desong Fan,Ming Jin,Jun Wang,Jinhui Liu,Qiang Li
Thermal dissipation has become a vital issue in electronic devices with highly miniaturization and integration. As a high thermal conduction material, graphite has been used widely in these devices. However, heat dissipation of graphite is limited by the poor thermal radiation in serving as a heat sink. In this work, we proposed a novel composite foil with a sandwich structure of graphite-silver-polyimide, exhibiting high thermal conductivity and excellent selective emission property, which is attractive for application in outdoor space. The heat dissipation performance of the foil was numerically and experimentally investigated. Our simulations confirmed that employing a selective thermal emitter in the sandwich structure prevented object surface from overheating under direct sunlight, augmenting the dissipated heat generated by heat source, reducing the local high temperature of surface. By the solar simulator and infrared camera, we experimentally demonstrated the numerical prediction that the heat dissipation ability of sandwich structure is much better than the graphite.
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
COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Yifei Qu,Xiang Li,Xiu Wang,Hongqi Dai
The electromagnetic interference and heat accumulation pose a significant challenge for the traditional high-density single-function electromagnetic shielding materials in advanced flexible integrated electronics. Herein, nano-silver flakes (AgNFs, reflective layer), MXene (Ti 3 CNTx, loss layer) and silver nanowires (AgNWs, heat conduction and shielding layer) constructed ordered multi heterogeneous layers high-performance flexible electromagnetic shielding functional composites (AMA composites). Especially the composites exhibited outstanding electromagnetic interference shielding efficiency (EMI SE) of 70.96 dB even with an extremely thin coating of 25 g/m 2 , which is 350% higher than that of the commercial standard (20 dB). It is worth noting that the AMA composites also possessed certain qualities such as superior thermal conductivity , flame retardancy, chemical resistance, high-temperature resistance (25 °C–100 °C), and mechanical properties (tensile strength of 44.4 MPa, Young's modulus of 0.6 GPa). The composites display application possibilities in highly integrated advanced flexible electronic products and wearable electronic devices, as well as provide structural design and research ideas for the usage of a new MXene material (Ti 3 CNTx) in electromagnetic shielding composite materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 10
·期 2
·593-601
·
IF 12.732
Maohua Li,Linhong Li,Yue Qin,Xianzhe Wei,Xiangdong Kong,Zhenbang Zhang,Shaoyang Xiong,Hainam Do,James C. Greer,Zhongbin Pan,Tao Cai,Wen Dai,Cheng-Te Lin,Nan Jiang,Jinhong Yu
Considering the significant threat of heat to electronic equipment and heat dissipation problems existing in powerful systems, thermal management materials are in high demand. In conjunction with the increasing need to dissipate heat and stabilize temperature, high thermal conductivity and phase change latent heat are attracting more attention when designing thermal management materials. This work proposes a strategy to combine a phase change matrix and thermally conductive filler using freeze casting. The highest thermal conductivity reaches 23.1 W m−1 K−1 accompanied by 62 J g−1 phase change latent heat. Meanwhile, replacing ice with an organic phase change material in freeze casting can result in an aligned structure. This discovery will pave a novel way for introducing thermal latent heat without abandoning the aligned structure.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Wenjie Tan,Yili Wei,Yiwen Zhang,Ping Shen,Hua Tu,Yurou Chen,Jun Li,Shun Wang,Yadong Wu,Huile Jin
To improve the interfacial interaction between natural sepiolite (SEP) and fluororubber (FKM), an acid-activated sepiolite (GSEP) was prepared by modifying the natural SEP in inorganic acid solution. The GSEP appear fine needle-like nanostructures and has relatively higher specific surface area (181 %), maximum N 2 adsorption capacity (218 %), and purity compared to SEP. The silanol groups on GSEP formed Si-C bonds with FKM, which increased the cross-linking density of the composites, thus enhancing the mechanical and thermal conductivity of the FKM. Compared to FKM, the tensile strength, modulus at 100 % strain, hardness and initial decomposition temperature of the FKM/GSEP-15 were increased by 259 %, 150 %, 11.7 % and 14.5 °C, respectively. This work provides a new strategy for preparation of high performance FKM with high heat dissipation and high mechanical properties.
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
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
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IF 6.984
Xiao Meng,Siyin Qin,Hongbo Fan,Zhaowen Huang,Jiaoling Hong,Xiaoying Xu,Xing Ouyang,Da-Zhu Chen
Microencapsulated phase-change materials (MPCMs) with carbon nanotube (CNT)-enhanced fillers and binary cores, which exhibit improved thermal conductivity and an adjustable working temperature range, are highly desirable for various heat energy storage applications. However, degraded properties are usually found for the CNT-enhanced MPCMs due to the poor compatibility of CNTs with PCMs, and the existing types of binary-core MPCMs (BCMPCMs) are quite limited. Herein, we prepared a novel type of BCMPCM with a n -octadecane/ n -octacosane (C18/C28) mixture as the core, octadecyl isocyanate-grafted CNTs (OICNTs) as the enhancers and melamine-formaldehyde (MF) resin as the shell via in situ polymerization. Morphological and structural characterization of the OICNT-enhanced BCMPCMs demonstrated uniform distributions of OICNTs in both the core and shell. The determined phase-change temperatures were approximately 26 °C and 43 °C, with small degrees of supercooling. The phase-change enthalpy was as high as 187.9 J/g for a relatively large OICNT loading (3 wt%). Thermal conductivity measurements of the OICNT-enhanced BCMPCM/epoxy resin composites showed a 71.4% increase over that of the pure BCMPCM/epoxy resin composite. Moreover, the BCMPCMs experienced two separate temperature buffer stages resulting from the phase-change processes and exhibited a prominent thermal regulation capacity, which is of significance for their potential applications in the cooling of electronic devices, battery thermal management, utilization of waste heat, and air conditioning systems, etc.
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 ENGINEERING JOURNAL
·
2022
·
IF 16.744
Weiye Chen,Lei Chen,Liangyu Li,Chuanshuai Dong,Lizhi Zhang
Phase change energy storage technology has broad applications in many engineering fields, such as building energy conservation, aerospace, and thermal management of electric equipment. However, the inorganic phase change materials suffer a lot from supercooling, phase separation, and low thermal conductivity. Therefore, this paper aims at developing a novel electrically-triggered phase change composite by making use of its supercooling characteristics, achieving a controllable release of latent heat as it is wanted. Polished by radial and axial grinding respectively, both surface-triggered electrodes (STE) with a uniform rough structure and point-triggered electrodes (PTE) with the gradient rough structure were prepared to investigate the effect of surface structure on the electrical crystallization. The 100-cycle test results indicated the newly-prepared electrode achieved a stable electrically-triggering ability. The oxidation rate of electrodes was significantly affected by interface characteristics of the gas–liquid-solid interfaces. What’s more, the effect of voltage and supercooling degree on the crystallization behaviours, like induction time, morphology, and growth of the dendrite, and heat transfer process, were comprehensively investigated. With the increase of the supercooling degree, the dendrite shape gradually changed from acicular crystal to flocculent crystal, and the induction time decreased rapidly. To improve the thermal conductivity, a novel phase change composite using sodium acetate trihydrate/carboxymethyl cellulose/expanded graphite (SAT/CMC/EG) was developed. Considering both thermal conductivity and electrical nucleation, the optimized mass ratio of SAT: CMC: EG was 100:1:8. These research findings would provide valuable guidance in the intelligently-controllable energy storage technology.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Bin Wang,Yaotian Yan,Jinghuang Lin,Yifei Cai,Jian Cao,Junlei Qi
Efficient multi-path heat dissipation is urged to be designed for balancing the heat density generated in highly integrated electronic devices. Herein, aluminum foam/carbon composites were fabricated by chemical bath and annealing method to realize the effect of strengthening the effective thermal conductivity while retaining the convective heat transfer characteristics of the porous structure . The results show that the continuous and high crystalline carbon coating can be obtained in the optimized composites prepared with 350 g dopamine addition at 600 °C annealing temperature. When compared with amorphous carbon , the phonons in crystalline carbon can carry more energy during the heat transport in terms of high phonons density of states, and their scattering behavior can be alleviated. A smaller temperature gradient is further established in the system. Hence, a desirable thermal conductivity, 21.44 W m −1 K −1 , is obtained in the optimized composites, which is almost 3 times that of pristine aluminum foam (7.67 W m −1 K −1 ). Additionally, the remarkable cooling efficiency of 24.71% in comparison to other studies, suggests that aluminum foam/carbon composites hold great potential as thermal management materials in addressing the issue of intense heat generation.
研究领域:
材料科学
·
热管理工程
✓ 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）