JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2017
·Vol. 100
·期 6
·2482-2491
·
IF 2.841
Ming Xiang,Youfu Zhou,Wentao Xu,Decai Huang,Kun Wang,Wei Pan
Aluminum nitride (AlN) nanopowders have been synthesized by a novel method which combines the hydrothermal and carbothermal techniques. The phase of the nitridation products can be controlled through adjusting the carbon content of precursor by adding different amount of urea (U). The nitridation product synthesized from the precursor (U/Al=2) was comprised of spherical and well-distributed particles with sizes ranging from 50 to 100 nm. The nitridation procedure was investigated in detail with TG/DSC, XRD, and TEM measurements. It was found that the core-matrix structured Al 2 O 3 /C mixture presents after pyrolysis, favoring the nitridation completed at low temperature, and brings in temperature independency for AlN grain size. Finally, the additive-free AlN ceramic with 99.08% relative density has been achieved by pressureless sintering at 1850°C.
研究领域:
材料科学
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陶瓷工程
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 35
·18578-18582
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IF 5.968
Weijin Qian,Hongwei Lai,Xiaozhu Pei,Jiao Jiang,Qiang Wu,Yongliang Zhang,Xizhang Wang,Zheng Hu
Here we report the construction of CsI–AlN hybrid nanostructures by evaporating CsI onto preformed AlN nanocone arrays. The field emission performances of the hybrid samples are much improved due to the lower work function, better conductivity and more emission sites, depending on the size and density of the CsI nanoparticles. But the performance gradually decays after ca. 45 min stable emission due to the instability of CsI during field emission which has been neglected to date. The results suggest that further effort to prevent the loss of Cs species to improve the stability of CsI-decorated hybrid nanostructures is required for practical applications.
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高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Shen Qi,Xiaojian Mao,Xiaokai Li,Minghui Feng,Benxue Jiang,Long Zhang
Wurtzite-structured aluminum nitride (AlN) hexagonal bipyramids were prepared via a carbothermal reduction nitridation method using alumina and carbon as the raw materials. The growth of the AlN hexagonal bipyramids is dominated by the vapor-solid (VS) mechanism with Fe 2 O 3 , SiO 2 and Na 2 O acting as mineralizers under alternate gas pressures. The preferred growth direction of the AlN hexagonal bipyramids is [0001]. Photoluminescence spectra of the AlN hexagonal bipyramids showed near-band edge emission at 512 nm at room temperature. The AlN hexagonal bipyramids might be useful for optical micro-devices.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2023
·
IF 6.9
Jinjie Mo,Ziye Ling,Zhengguo Zhang,Xiaoming Fang
In this paper, we investigate a metal composite prepared using a one-step pressing method, where Al–Si alloy acts as the phase change materials (PCMs) and Al 2 O 3 /AlN serve as the structural support materials. The alloy formation and PCM composite preparation are synthesized in a single step. The study aims to characterize the microstructure, thermodynamic, and thermal properties of the composite material. To assess the heat storage properties of the prepared composite PCMs at temperatures higher than 600 °C, a high-temperature test system is established using a high-frequency induction heater. Additionally, we explore how to improve the issue of liquid leakage under high-temperature conditions. The results demonstrate that Al 2 O 3 and AlN (ceramic materials) exhibit excellent chemical compatibility with Al–Si composite PCMs. After sintering, the ceramic materials form a strong bond with Al–Si, effectively retaining the liquid phase of Al–Si alloy within the composite material. Consequently, the Al–Si composite PCMs do not exhibit high-temperature liquid leakage under elevated conditions. Both Al 2 O 3 /Al–Si and AlN/Al–Si composites possess favorable high temperature heat storage properties. The phase change enthalpy of Al 2 O 3 /Al–Si composite reaches 400 kJ/kg, with a thermal conductivity of 36 W/(m·K). Similarly, the AlN/Al–Si composite achieves a phase change enthalpy of 404 kJ/kg and a thermal conductivity of 43 W/(m·K). Both composites fulfill the requirements for high-temperature heat storage applications.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
Laser & Photonics Reviews
·
2025
·Vol. 19
·期 22
·e00823
·
IF 10
Yuxiang Zhang,Weiqing Tang,Haiyang Liu,Mengyu Liu,Anqi Cheng,Shiming Wu,Ying Ye,Min Liu,Zongnan Zhang,Chunmiao Zhang,Yaping Wu,Xu Li,Zhiming Wu,Junyong Kang
Two-dimensional transition metal dichalcogenides represent a highly attractive platform for the development of valleytronic devices due to their unique spin-valley properties. Herein, a plasma-assisted interfacial engineering is proposed to enhance valley polarization and valley splitting in MoS 2 /AlN heterostructure by modifying the surface configurations of AlN substrates. The experimental results show that after the optimized N 2 -plasma treatment, the AlN surface becomes smoother with a decreased migration barrier, thereby facilitating the growth of high-quality MoS 2 . The valley splitting and degree of valley polarization in the optimal sample reach 7.96 meV (the corresponding Landé g factor is 19.6) and 33.8% at −7 T, which are 16.0- and 1.0-fold higher than those in the untreated MoS 2 /AlN heterostructure, respectively. Theoretical simulations indicate that the enhanced spin-valley properties are predominantly ascribed to the AlN surface magnetism induced by the hybridization of P z and P y orbitals of surface N and O atoms. This work opens a new avenue for manipulating spin-valley properties in 2D materials via interfacial engineering.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 83
·80262-80267
·
IF 3.289
Yuan Wang,Xvsheng Qiao,Jun Wan,Yao Xiao,Xianping Fan
AlN microspheres were prepared by applying both sol–gel technique and gas reduction nitridation, and then modified by 3-aminopropyltriethoxysilane (KH550) to increase the affinity with the polymer. The KH550 modified AlN microspheres/UHMWPE composites were fabricated by solution mixing and hot pressing technique. Their microstructure, thermal stability, thermal conductivity and dielectric properties were investigated. The AlN microspheres/UHMWPE composite demonstrated much higher thermal conductivity in comparison with the commercial AlN particles/UHMWPE composite. The dielectric constant and dielectric loss of the KH550 modified AlN microspheres/UHMWPE composites increased slightly with increasing AlN content. The KH550 modified AlN microspheres/UHMWPE composites still had a high surface resistivity (>1014 Ω m) and volume resistivity (>1015 Ω m).
研究领域:
材料科学
·
高分子化学
·
电气工程
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 5
·1025-1033
·
IF 1.6
Li Meijuan,Wang Chuanyi,Wang Gaoqiang,Wang Chuanbin,Shen Qiang
AlN ceramics were prepared by plasma activation sintering (PAS) with compound additives yttrium acetylacetonate (Y(acac) 3 ) and melamine (C 3 H 6 N 6 ). The effects of compound additives on the microstructure, density, and thermal properties of AlN ceramic were studied. Y(acac) 3 and C 3 H 6 N 6 can form Y 2 O 3 , residual organic carbon and reducing gas during the heating process, which improves the AlN sintering performance at a temperature of 1 700 °C and the bulk thermal conductivity. When the content of Y(acac) 3 is 10 wt% and C 3 H 6 N 6 is 3 wt%, the thermal conductivity of AlN ceramics is 105.6 W/(m·K), which is much higher than that of AlN ceramics with Y 2 O 3 under the same sintering conditions. This work provides theoretical reference for the preparation of high-performance AlN ceramic.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jing Zhang,Qinfu Liu,Mingyi Huang
Halloysite is a natural aluminum-rich nano-sized clay mineral, which can offer the aluminum source to synthesize aluminum nitride (AlN) in a low-cost and environmentally friendly manner. The micron-sized AlN with different morphology and structure, including self-assembled pine-like aggregates, hollow bayberry-like spheres, and high aspect ratio whiskers, were successfully synthesized at 700 °C under nitrogen atmosphere using natural hydrated halloysite (10 Å HNT). These three kinds of varying morphological AlN formed by different mechanism. The self-assembled-AIN pine-like aggregates formed by in-situ nitrogen substitution within the Al-O octahedra of 10 Å HNT thermal fragmentation through self-assembly. The formation of the bayberry-like hollow spheres is governed by a gas–liquid reaction pathway, whereas the development of whiskers with a high length-to-diameter ratio is driven by a gas–liquid-solid mechanism. The morphological comparison of AlN synthesized from 10 Å HNT with 7 Å HNT further confirms the validity of the in-situ substitution mechanism we previously proposed, as well as reflecting the critical influence of halloysite hydration state on structural evolution of AlN. This study offers a new insight into tailoring AlN nanostructures using clay mineral templates, with promising applications in thermally conductive composites and electronic packaging materials.
研究领域:
材料科学
·
无机非金属材料
·
纳米结构材料
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陶瓷材料
·
复合材料
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DOI
高影响因子
International Journal of Polymer Science
·
2024
·
IF 3.4
Nghiem Thi Thuong,Nguyen Ba Lam,Pham Anh Son,Nguyen Ba Chien,Nguyen Pham Duy Linh,Chu Thi Hai Nam,Nguyen Anh Vu
In the present work, AlN was modified with vinyltriethoxysilane (VTES), and its effect on the properties of a thermally conductive composite of high impact polystyrene (HIPS), and AlN was investigated. Three composites, HIPS/AlN5, HIPS/AlN9, and HIPS/moAlN9, were prepared by mixing HIPS and AlN in a toluene solution, followed by hot pressing. The HIPS/AlN composite was characterized by tensile test, impact strength, flexural strength, and hardness shore D. The sample HIPS/moAlN9 showed the improvement of these properties compared to that of the HIPS/AlN9 sample. The increment of those mechanical properties was due to the good interaction between the modified AlN and HIPS resin matrix, which was revealed by morphology observation by SEM. Incorporating modified AlN into the HIPS matrix was also found to enhance the thermal conductivity by about 20%, from 0.15 for HIPS to 0.18 (W/m·K) for HIPS/moAlN9. It was explained due to the good adherence of AlN to the HIPS, which provided more thermal conductive routes than HIPS/AlN. This approach provides a possible strategy to prepare thermally conductive HIPS composite, which may be suitable for electronic device that required heat dissipation.
研究领域:
材料科学
·
热管理技术
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Zhilei Wei,Wenqi Xie,Xiaoyu Zhang,Zhejian Zhang,Yanjun Li,Hongyan Xia,Bo Wang,Zhongqi Shi
Highly permeable AlN micro-honeycomb (AlN-H) ceramics with unidirectional macropore channels and porous struts were fabricated via tertiary butyl alcohol (TBA)-based freeze-casting. The effect of the AlN solid loading of the freezing slurries on the microstructure, open porosity, N 2 gas permeability, and compressive strength of the as-prepared AlN-Hs were systematically investigated. The results showed that the honeycomb structure and open porosity of the AlN-Hs can be adjusted by altering solid loading. With the increase in solid loading from 10 vol% to 30 vol%, the approximate pore channel size of the AlN-Hs decreased from 50.1 μm to 15.6 μm, strut thickness increased from 8.2 μm to 16.6 μm approximately, and the corresponding open porosity decreased from 87.6–56.6%. The as-fabricated AlN-H with an open porosity of 64.9% possessed high N 2 gas permeability and essential compressive strength and can be used as a catalyst support or filter in industries.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
M. Dong,L. P. Shen,H. Wang,H. B. Wang,J. Miao
Aluminum-nitride-(AlN)-transformer oil-based nanofluid was prepared by dispersing AlN nanoparticles in transformer oil. The composition-dependent electrical conductivity of AlN-transformer oil nanofluid was investigated at different ambient temperatures. The results indicate the nonlinear dependences of the electrical conductivity on volumetric fraction and temperature. In comparison to the pure transformer oil, the electrical conductivity of nanofluid containing 0.5% AlN nanoparticles has increased by 1057 times at 60°C. By considering the electrophoresis of the AlN nanoparticles, a straightforward electrical conductivity model is established to modulate and understand the experiment results.
研究领域:
材料科学
·
电气工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shengyuan Chen,Kailei Lu,Xiaolan Zhou,Zehua Zhouchen,Xu Huang,Jianqi Qi,Tiecheng Lu
In this work, a simple, safe, and low-cost two-step route for preparing spherical AlN powders was developed. Specifically, pure AlN spherical powder can be obtained by using water as the solvent, ammonium polyacrylate as the dispersant, carbon powder and alumina powder as the raw materials, spraying and granulating into a spherical precursor, and then sintering at high temperature under a nitrogen atmosphere. The results demonstrate that the average size and the associated distribution of the precursor can be adjusted by regulating the solid or dispersant content of the slurry, which is beneficial for governing the size of the AlN powder. The average particle size of the sintered spherical AlN powders is approximately 33.5 μm, presenting high sphericity (greater than 0.9) and excellent flowability. This approach developed for preparing spherical AlN powder is of great significance for promoting the widespread application of AlN powder in the field of high-performance fillers.
研究领域:
材料科学
·
无机化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）