JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guo-Juan Wang,Qiang-Qiang Zhu,Gan-Yu Cai,Yue Zhai,Shuang-Qiang Fang,Juan Kang,Le Wang
The realization of high-quality laser-driven white light remains challenging due to the limited heat dispersion and inconsistent light uniformity of color converters. In this study, ZnO particles with high thermal conductivity and a high index of refraction were induced into phosphor-in-glass (PiG) films to form a Y 3 Al 5 O 12 (YAG):Ce 3+ -ZnO composite structure. The influences of ZnO particles on the luminescence, optical properties, thermal dissipation performance, and light uniformity of PiG films were studied in detail. Benefiting from the improved thermal dissipation, the luminescence saturation threshold of the YAG:Ce 3+ PiG film was improved from 10.97 to 12.96 W/mm 2 , and the luminous flux was improved from 1271 to 1468 lm. The increased light scattering attributed to ZnO particles also effectively dispersed both laser and emitted light. This significantly enhanced the angular consistency of the color rendering index (Ra) and correlated color temperature (CCT). It indicates that the YAG:Ce 3+ -ZnO composite PiG film would be an interesting color converter for producing high-quality laser-driven white light.
研究领域:
材料科学
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光学工程
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Wenjun He,Gang Chen,Chao Li,Xiaohong Chen,Yaowei Chen,Mengyuan Xiong,Xinsheng Niu,Ming Zhu,Xiaoyan Li
The miniaturization and integration of next-generation electronic devices are accompanied by a substantial increase in electromagnetic interference (EMI) and heat generation, which requires light and thin EMI shielding materials. Herein, we attempt to tackle this challenge by designing a heterogeneous membrane using carbon nanotubes (CNTs) and magnetite (Fe 3 O 4 ) nanorods. The polymer-coated Fe 3 O 4 uniformly adsorbs on the surface of the polyaniline (PANi) coated CNTs, forming a self-supporting composite membrane with vertical CNTs under a magnetic field. Due to the entanglement of the CNTs, the vertical alignment is more effective in the top region of the membrane than in the bottom, resulting in an asymmetric structure that is beneficial to EMI absorption. When electromagnetic waves are incident from the top surface, high-absorption electromagnetic shielding is obtained due to multiple attenuations and absorption-reflection losses. The vertical orientation and heterogeneous CNTs network structure of the membrane also enable stable heat dissipation.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Chun-Han Lu,Yi-Ting Tsai,Tzong-Liang Tsai,Ting-Shan Chan,Xuejie Zhang,Chun Che Lin
The analysis of human body composition and food composition requires high-efficiency broadband near-infrared (NIR) lighting sources to achieve a portable, appropriately sized equipment. Herein, we develop a whitlockite-type NIR phosphor Sr9Sc(PO4)7:Cr3+ with an emission centered at 860 nm and full width at half-maximum of 147 nm. Due to the structural characteristics of the matrix, the 60 mol % Cr3+ substitution at the Sc3+ sites gives an internal quantum efficiency up to 56.5%. By replacing Sr with Ba and Ca, we observe a nontypical spectral shift phenomenon and discuss the influence of the second-sphere effect on octahedral Cr3+ ions. To evaluate the diagnostic application, we design a NIR ceramic device with a high optical power of 27.38 mW and high heat dissipation, which can decrease surface working temperature by nearly 50 °C for digital intraoral application. This study provides the research of the second-sphere coordination effect for selective octahedral sites such as Ca, Sr, and Ba coordinated by O atoms on a whitlockite-type crystal. Furthermore, the device promotes a nonionizing solution for detecting dental caries, tooth calcification, and diagnostic application.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Desheng Chen,Ke Liu,Zixin Ye,Gao Zhang,Jinxin Xu,Dongfang Hu,Jiong Ding
The accelerating rate calorimeter is a commonly used tool for evaluating thermal hazards. Due to the thermal inertia, the heat dissipation between the reaction system and the furnace, the pure adiabatic condition cannot be achieved. This leads to inaccurate thermodynamic and kinetic results. To systematically study and correct this heat dissipation, numerical simulations and experiments were carried out to investigate the main heat dissipation path and the factors. The results show that convection is the main heat dissipation pathway. The dynamic characteristics of the thermocouple and sidewall have different effects on reactions with different self-heating rates. In addition, a heat dissipation correction method based on the heat transfer model is proposed and validated by simulations and experiments. The simulation and experimental results both show the effectiveness of this correction method. These mean it has a certain significance for the improvement of the accelerating rate calorimeter experimental data processes.
研究领域:
化学工程
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热力学
·
安全科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junjie Tian,Hongmei Liu,Rong Guo,Honghao Sun,Yufeng Chen,Yi Wang,Qian Xu,Yao Zhu,Qing Yao
White light diodes (WLEDs) composed of blue chip and phosphor-converter are widely used in liquid crystal display (LCD) projectors as backlights. And it often needs a condenser lens to irradiate white light onto the LCD screen. In this paper, a large size lenticular shaped phosphors-in-glass (PiG) was prepared by Isobam-APS gel casting for the first time. The PiG could act for converting and condensing in LCD projector. Then a rectangular light spot similar to the shape of LCD screen was obtained to reduce the loss of light. The maximum temperatures of the chip and PiG were 62.1 °C and 57.3 °C respectively after working for 600 s and gradually stabilized by simulation. It was proved that simulation result was reliable through comparing with the actual measured value and the lenticular shaped PiG had good heat dissipation capacity for its large area. In conclusion, this is a successful application of PiG in LCD projector, which has guidance and promoting effect.
研究领域:
光学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 10
·1144
·
IF 2.891
Xinrui Ding,Ruixiang Qian,Liang Xu,Zongtao Li,Jiasheng Li,Caiman Yan,Binhai Yu
In this work, a phosphor converter with small thickness and low concentration, based on a micro-angle tunable tilted filter (ATFPC), was proposed for hybrid-type laser lighting devices to solve the problem of silicone phosphor converters’ carbonizing under high-energy density. Taking advantage of the filter and the scattering characteristics of microphosphors, two luminous areas are generated on the converter. Compared with conventional phosphor converters (CPCs), the lighting effects of ATFPCs are adjustable using tilt angles. When the tilt angle of the micro filter is 20°, the luminous flux of the ATPFCs is increased by 11.5% at the same concentration; the maximum temperature (MT) of ATFPCs is reduced by 22.8% under the same luminous flux and the same correlated color temperature (CCT) 6500 K. This new type of lighting device provides an alternative way to improve the luminous flux and heat dissipation of laser lighting.Keywords:hybrid type laser lighting;micro-angle tunable filter;heat dissipation
研究领域:
光学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jieyan Zhao,Yingnan Song,Zengchao Yang,Yong Li,Jiangtao Li
Daytime radiative cooling enables passive cooling of objects without consuming energy. However, it is a challenge for most radiative cooling films to achieve exceptional solar reflectivity , infrared emissivity and thermal conductivity simultaneously, which limits their applications in above-ambient conditions such as electrical equipment . Herein, we prepare highly solar-reflective β -Si 3 N 4 dielectric particles with solar reflectivity exceeding 0.91 and atmospheric window emissivity of 0.93 by one-step combustion synthesis . The radiative cooling film consisted of β -Si 3 N 4 particles and PVDF matrix achieves a subambient cooling performance of 11.63 °C and theoretically yields a radiative cooling power of 45.41 W m −2 in the daytime. Futhermore, the film exhibits high thermal conductivity of 3.19 W m −1 K −1 due to the heat conducting pathways constructed by elongated rod-like β -Si 3 N 4 particles, which leads to a remarkable temperature drop of 5.00 °C when be applied on the surface of 5 W LED. The film reported here provides a practical option for the efficient radiative cooling and heat dissipation of electrical equipment.
研究领域:
材料科学
·
热能工程
·
光子学
·
能源效率
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·
IF 15.7
Yang Guo,Nan Hu,Xiaonan Wu,Mengxue Zhang,Dailin Yang,Liwu Fan,Juan Wang
Solar-driven interfacial evaporation has shown great potential in freshwater production due to its minimal carbon footprint and adaptability to diverse water sources. However, while significant progress has been made in enhancing vapor generation rates, limited heat dissipation during condensation continues to constrain overall water production efficiency. Here, we introduce a latent heat-assisted evaporative cooling (LHEC) strategy that effectively dissipates condensation heat by harnessing water’s latent heat. Using delignified wood as the demonstrating LHEC substrate, we achieved a 2.5-fold increase in heat dissipating heat flux and accelerated vapor diffusion from the evaporation region toward the condensation interface. This approach improves solar water production efficiency to 0.76 (versus 0.49 in conventional systems) and demonstrates robust salt resistance for long-term operation. Notably, the plug-and-play design of the LHEC substrate enables seamless integration into a range of solar evaporation architectures, including single/multi-stage systems, all of which benefit from its enhanced condensation performance. This universality offers a fully passive, single solar-powered solution. This LHEC strategy represents a significant step forward in scalable, efficient and environmentally sustainable freshwater production. Heat dissipation restricts freshwater production in solar interfacial evaporation. Authors propose a latent heat-assisted evaporative cooling strategy to enhance heat dissipation and vapor transport during condensation, boosting freshwater production.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Bowen Zhang,Xinyan Lu,Haonan Feng,Youzheng Wang,Yi Liu,Yun-Hui Mei
The high-power density of silicon carbide (SiC) devices requires the development of thermal interface materials (TIM) for rapid heat dissipation between direct bond copper (DBC) substrate and heat sink. However, the insufficient oxygen in the central bonding layer prevents the complete decomposition of organic solvents in silver paste, resulting in weak thermal dissipation. In this study, the Self-Oxygenation silver paste (SO-Ag) was successfully developed to promote the complete decomposition of organic solvents in N 2 environment, with -C-O- peak energy residual of 0.35 %. The in-situ generation of silver nanoparticles effectively enhanced the necking growth and achieved a highly reliable large-area bonding of 25 × 25 mm 2 under a pressureless sintering process. Taking advantage of the dense bonding layer and uniform porosity distribution, the proposed SO-Ag paste effectively mitigates the heat accumulation and reduces the chip temperature from 314 °C to 47 °C under forced water convection conditions. Furthermore, after 1000 cycles of thermal shock test (TST), the thermal resistance of SO-Ag increased by only 28 % without heat accumulation, indicating superior thermal reliability. The results confirm the superior thermal dissipation reliability of proposed SO-Ag, which enables the long-term operation of SiC devices.
研究领域:
材料科学
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热工学
·
电力电子
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纳米技术
·
电子封装
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2023
·
IF 15
Zhongpeng Zhu,Yupeng Chen,Xianfeng Luo,Weining Miao,Zhichao Dong,Jiajia Zhou,Ye Tian,Lei Jiang
Controllable impact spreading behavior is critical for effective thermal management of spray cooling. However, splash and retraction are common problems on hydrophobic (HPB) and hydrophilic (HPL) surfaces. Herein, by regulation of surface wettability, we report a controllable ultrafast impact superspreading behavior (superspreading time of ∼3.0 ms) without splash and retraction on superamphiphilic (SAPL) silicon surfaces. Analysis of dynamic wetting processes combined with observation of lateral force microscopy images on SAPL surfaces reveals the existence of a precursor film at the spreading edge induced by heterogeneous surface wettability at nanoscale. Further study indicates that the inhibition of splash results from the high liquid flux in precursor film, which suppresses the interposition of air at the spreading edge. The reduction of Laplace forces owing to the presence of precursor film inhibits retraction at the spreading frontier. Taking advantage of this impact superspreading behavior on SAPL surfaces, effective heat dissipation is demonstrated, offering uniform and high heat flux for the spray cooling process.
研究领域:
材料科学
·
热工程
·
表面科学
·
流体力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2023
·Vol. 12
·期 1
·1-10
·
IF 19.4
Gu Kai,Zhong Haizheng
Light-to-heat conversion has been intensively investigated due to the potential applications including photothermal therapy and solar energy harvesting. As a fundamental property of materials, accurate measurement of light-to-heat conversion efficiency (LHCE) is of vital importance in developing advanced materials for photothermal applications. Herein, we report a photothermal and electrothermal equivalence (PEE) method to measure the LHCE of solid materials by simulating the laser heating process with electric heating process. The temperature evolution of samples during electric heating process was firstly measured, enabling us to derive the heat dissipation coefficient by performing a linear fitting at thermal equilibrium. The LHCE of samples can be calculated under laser heating with the consideration of heat dissipation coefficient. We further discussed the effectiveness of assumptions by combining the theoretical analysis and experimental measurements, supporting the obtained small error within 5% and excellent reproducibility. This method is versatile to measure the LHCE of inorganic nanocrystals, carbon-based materials and organic materials, indicating the applicability of a variety of materials.
研究领域:
材料科学
·
光热应用
·
能量收集
·
纳米技术
✓ 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）