ADVANCED ENGINEERING MATERIALS
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2021
·Vol. 23
·期 10
·2100347
·
IF 3.862
Jialu Zhang,Hao Xu,Jie Guo,Yingying Zhang,Tianchi Chen
The aerospace industry has extremely strict requirements for metal materials, especially the stability of the material at a low temperature and in harsh environment. Herein, superhydrophobic anti-icing aluminum sheets are fabricated with traditional hydrothermal reaction and modified by (heptadecafluoro-1,1,2,2-tetradecyl) triethoxysilane (AC-FAS). Field-Emission Scanning Electron Microscope (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) are used to analyze the surface morphology and chemical compositions. The satisfactory properties of superhydrophobicity and anti-icing result from its dense microcosmic array structure and its low surface energy. The prepared superhydrophobic aluminum surface can realize wettability alteration, in which the contact angle increases from 118° on the original aluminum sheets to 155° with a rolling angle of 10°. In addition, the prepared superhydrophobic surface has anti-icing and self-cleaning ability. According to the aforementioned results, it is believed that the superhydrophobic aluminum sheets can be an excellent candidate in the aerospace field.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yanling Cheng,Haoxian Huang,Xinxin Xi,Yuqiang Deng,Hainan Zhang,Chengyong Wang,Huatay Lin
Al flake was used as the filler to optimize the properties of vinyl-polysilazane based photo-curable resin derived ceramics (P-PDCs) manufactured by digital light processing. Al flake addition showed a significant inhibitory effect on the macroscopic cracking and the micrometer voids of the P-PDCs. With the Al flake content of 0.6 wt%, P-PDCs pyrolysed at 1300 °C exhibited a maximum Vickers hardness and bending strength of 9.47 GPa and 89.39 MPa, respectively. The Nano-indentation measurements showed an improvement of the elastic modulus from 74.56 GPa to 85.62 GPa, and the indentation hardness from 7.12 GPa to 12.47 GPa as the increase of the Al flake. During pyrolyzing, the pristine Al flake reacted with the pyrolysed by-product obtained hollow lamellar Al 2 O 3 phase of varying aspect ratios in the forming matrix, which acted not only as a strengthening phase on the mechanical properties but also as a channel for the release of gaseous.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Wenqi Li,Ling Shi,Junying Zhang,Jue Cheng,Xiaodong Wang
This paper reported the double-layered surface decoration for aluminum flakes by coating a zinc aluminum phosphate passive film, followed by fabricating a phytic acid–aluminum complex sealing film. The chemical compositions and structures of surface-decorated aluminum flakes were characterized by Fourier -transform infrared, X –ray photoelectron , and energy-dispersive X –ray spectroscopy and their morphology and double-layered structure were confirmed by scanning and transmission electron microscopy . The surface-decorated aluminum flakes not only show excellent dispersibility in water due to the enhanced hydrophilicity , but also exhibit good corrosion resistance and chemical stability against water. Most of all, the double-layered surface decoration leads to an improvement in optical performance of coating surface such as glossiness, flop index and distinctness of image compared to the single-layered one when the surface-decorated aluminum flakes are applied for waterborne coatings. The surface-decorated aluminum flakes developed by this work can well serve as a good flaky aluminum pigment for high-performance waterborne coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Guiran Pan,Yimin Yao,Xiaoliang Zeng,Jiajia Sun,Jiantao Hu,Rong Sun,Jian-Bin Xu,Ching-Ping Wong
Inspired by the microstructures of naturally layered and highly oriented materials, such as natural nacre, we report a thermally conductive polymer composite that consists of epoxy resin and Al2O3 platelets deposited with silver nanoparticles (AgNPs). Owing to their unique two-dimensional structure, Al2O3 platelets are stacked together via a hot-pressing technique, resulting in a brick-and-mortar structure, which is similar to the one of natural nacre. Moreover, the AgNPs deposited on the surfaces of the Al2O3 platelets act as bridges that link the adjacent Al2O3 platelets due to the reduced melting point of the AgNPs. As a result, the polymer composite with 50 wt % filler achieves a maximum thermal conductivity of 6.71 W m–1 K–1. In addition, the small addition of AgNPs (0.6 wt %) minimally affects the electrical insulation of the composites. Our bioinspired approach will find uses in the design and fabrication of thermally conductive materials for thermal management in modern electronics.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yikun Sun,Bo Niu,Hongxiang Cai,Hao Tian,Liang Li,Qixin Zhuang,Donghui Long
The filler content and distribution are the most significant factors affecting the thermal conductivity (TC) of polymer-matrix composites. Orienting the filler for alignment is the most widely adopted approach to enhance TC in these materials. However, traditional orientation strategies require external fields or additional conditions, resulting in complex processes and hindering the ability to achieve conformal orientation of heterogeneous structures. In this context, an orientation strategy is proposed based on dense packing and injection molding to fabricate high-orientation and shape-controllable composites, thereby reducing limitations related to temperature, pressure, molding shapes, and matrix types during composite preparation. Dense packing induces the transition of high diameter-to-thickness ratio (DTR) fillers from locally isotropic to anisotropic alignment, while the injection molding process drives the overall orientation of the composites. Using aluminum (Al) flakes and cyanate ester (CE) as representative materials, a systematic study was conducted on the influence of filler content and composite thickness on the orientation of fillers. As a result, Al/CE-40 exhibits remarkable flexibility and achieves a maximum tensile strength of 29.9 MPa with an Al flake content of 40 wt %. The prepared Al/CE composites exhibit a high orientation ratio of 0.868 and a TC of 5.9 W·m–1·K–1, even with only 30 wt % Al content. Notably, the Al/CE composites maintain a high orientation when formed into specific shapes. Furthermore, various sheet-like materials with a high DTR, such as silver and mica flakes, show considerable promise as thermal management materials suitable for injection molding.
研究领域:
材料科学
·
热管理材料
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zongjie Yang,Shan Liu,Zhiyong Mao,Dajian Wang
Hierarchical porous alumina ceramics were prepared through hydratable alumina gel-casting method. The matrices were constructed by interlocked alumina platelets. Hollow glass spheres as pore formers participated in the fluorine-catalyzed structure formation process. The samples with 20 wt% hollow spheres added (1000–1300 °C) had volume densities, apparent porosities, linear shrinkages and compression strengths of 0.59–0.90 g/cm 3 , 81.68 %∼74.20 %, 1.40 %∼14.07 % and 12.64–23.36 MPa, respectively. Changing the fraction of hollow spheres (10–30 wt%, 1100 °C) had effects on tailoring the compression strengths (3.13–13.40 MPa), without apparently affecting the densities (0.58–0.60 g/cm 3 )/porosities (79.70 %∼82.28 %)/shrinkages (1.47 %∼1.93 %). The pore size distributions demonstrated the interlocking pores built by alumina platelets, the pores that inherited from the gel network, and the large pores provided by hollow spheres. The reheated (1300 °C) samples presented good structure stability with shrinkages of 6.60 %∼18.57 %. The synthesized ceramics with both high porosities and satisfactory strengths could meet the requirements of high temperature gas/liquid filtration or catalyst supporting, etc.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 68
·期 1
·151-159
·
IF 2.352
Jingshi Cao,Huaming Wang,Changlin Cao,Hongzhou Li,Liren Xiao,Qingrong Qian,Baoquan Huang,Qinghua Chen
Polydopamine (PDA) was employed to modify micrometric Al 2 O 3 platelets to improve the interfacial compatibility between α -Al 2 O 3 powder and ultrahigh-molecular-weight polyethylene (UHMWPE). The structure of PDA-coated Al 2 O 3 and UHMWPE composites was investigated via Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The thermal stability and mechanical performance of the samples were also evaluated. It is clear that UHMWPE/PDA-Al 2 O 3 composites exhibit better mechanical properties, higher thermal stability and higher thermal conductivity than UHMWPE/Al 2 O 3 composites, owing to the good dispersion of Al 2 O 3 powder in the UHMWPE matrix and the strong interfacial force between the macromolecules and the inorganic filler caused by the presence of PDA. The tensile strength and the tensile elongation at break of UHMWPE/PDA-Al 2 O 3 composite with 1 wt% PDA-Al 2 O 3 are 62.508 MPa and 462%, which are 1.96 and 1.98 times higher than those of pure UHMWPE, respectively. The thermal conductivity of UHMWPE/PDA-Al 2 O 3 composite increases from 0.38 to 0.52 W m −1 K −1 with an increase in the dosage of PDA-Al 2 O 3 to 20 wt%. The results show that the prepared PDA-coated Al 2 O 3 powder can simultaneously enhance the mechanical properties and thermal conductivity of UHMWPE. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SOFT MATERIALS
·
2019
·
IF 0.973
Zhiqiang Zou,Wei Wu,Yi Wang,Liang Wang
Rapidly increasing demands for higher integration density and stability of electronic devices embrace higher requirements for thermally conductive silicone rubber, which is promisingly used in ultra-thin components. In this work, alumina whiskers (AWs) and alumina flakes (AFs) are used to modify liquid silicone rubber (LSR) by fabricating binary (AFs/LSR) or ternary (AWs/AFs/LSR) composites. The thermal conductivity and mechanical strength of the binary and ternary composites were investigated. Thermal conductivity of the binary AFs/LSR composite (25AFs/LSR) was 0.1990 W m−1 K−1, while the thermal conductivity of the ternary AFs/AWs/LSR composite (20AFs/5AWs/LSR) was 0.2655 W m−1 K−1. Furthermore, the tensile strength of the ternary AWs/AFs/LSR composites increased by 180.9% as compared with the binary system, increased to 7.81 MPa from 2.78 MPa due to the introduction of 1 wt% AWs. As a reason, a significant synergistic effect of AWs and AFs in the enhancement of both thermal and mechanical properties of the LSR was proved. Furthermore, the dielectric property measurements demonstrated that the ternary composites exhibited a lower dielectric constant and dielectric loss, indicating that the AWs/AFs/LSR composites were qualified to be applied in the field of electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Yuan Niu,Chao Xiao,Mengyue Hu,Xianglan Liu,Xin Ding,Meng Xue,Xingyou Tian,Kang Zheng,Xian Zhang
The power density of flexible electronics, foldable devices and wearable devices is becoming increasingly high, posing higher requirements for the out-of-plane thermal conductivity of flexible substrates. This paper reports a polyimide (PI) film with excellent out-of-plane thermal conductivity and flexibility prepared with homemade hexagonal alumina (h-Al 2 O 3 ) flakes. With higher crystallinity, more regular geometry and larger diameter-thickness ratio, self-prepared h-Al 2 O 3 is more likely to lap out-of-plane to form a continuous and efficient heat conduction network. The PI/ h-Al 2 O 3 composite film exhibits higher thermal conductivity than that of PI/commercial spherical alumina (c-Al 2 O 3 ) composite film at the same mass fraction. The out-of-plane thermal conductivity of the PI composite film loaded with 40 % h-Al 2 O 3 reaches 1.53 Wm −1 K −1 , 1.91 times higher than that of PI/ c-Al 2 O 3 composite film (0.80 Wm −1 K −1 ). Additionally, PI/h-Al 2 O 3 composite film exhibits excellent electrical insulation, high flexibility and enhanced thermal stability. This work provides an effective method to address the deficiency of out-of-plane thermal conductivity of PI film.
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
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Mahesh Velpula,Navaneeth Madathil,Supraja Potu,Lakshakoti Bochu,Krishnakanth Chithari,Jayalakshmi Vallamkondu,Prakash Kodali,Uday Kumar Khanapuram,Rakesh Kumar Rajaboina
The search for triboelectric materials with cost-effective synthesis methods and easy integration into triboelectric nanogenerators (TENGs) is an intense area of research to explore their potential and achieve high output performance. The current article presents the use of metal–organic framework-303 (MOF-303) as a positive triboelectric material in developing TENGs and explores applications in road safety. MOF-303 films were directly grown on an aluminum sheet through a simple hydrothermal synthesis method, enabling easy integration into the TENG device. The positive triboelectric nature of MOF-303 is verified with standard tests. The resulting TENG, incorporating MOF-303 as the positive and fluorinated ethylene propylene (FEP) as the negative triboelectric films, delivers an open-circuit voltage of approximately 435 V, a short-circuit current of 85 μA, and a power density of 7.4 W/m2. Furthermore, the continuous operation of the digital watch and calculator is demonstrated with the help of an energy management circuit. The present research paves the way for exploring the possibilities of the direct synthesis of MOF films on conducting substrates and exploring their actual triboelectric potential. The proposed use of these self-powered indicators represents a significant advancement toward enhancing future road safety systems. The simplicity of the fabrication process, combined with the significant output of the device, suggests excellent potential for its use in self-powered applications.
研究领域:
材料科学
·
能源技术
·
交通工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2025
·Vol. 222
·期 22
·2500553
·
IF 1.9
Yaqi He,Xinhua Li,Lihua Zhang,Jiawei Xu,Songhua Chen,Zongqing Ma
In this article, a batch of high-performance Sn-doped Nb 3 Al superconductors is prepared through mechanical alloying and subsequent low-temperature sintering. This article comparatively analyzes the superconducting properties, phase structure, and microstructure of Sn-doped Nb 3 Al under different sintering temperatures and sintering times to determine the most suitable sintering process for Sn-doped Nb 3 Al. The results show that the optimum sintering temperature of Sn-doped Nb 3 Al bulks is 800 °C, with an optimal sintering time of 5 h. The T c value of Sn-doped Nb 3 Al bulk obtained under this sintering condition is 14.8 k, and the value of J c is as high as 6.2 × 10 4 A cm −2 (4.2 K, 5 T). The elevated sintering temperature (900 and 1000 °C) results in significant growth of both Nb 3 Al grain size and Nb 2 Al nanoparticles. This reduces the number of effective pinning centers in the superconducting phase of Sn-doped Nb 3 Al, which severely weakens the flux pinning effect. As a result, the J c performance deteriorates gradually as the sintering temperature increases from 800 to 1000 °C. The extended duration of sintering time results in the formation of sintering holes, which significantly disrupt the continuity of the Nb 3 Al superconducting phase matrix and degrade its superconducting properties.
研究领域:
超导物理
·
材料科学
·
陶瓷与烧结
·
显微组织工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Tingting Ma,Junjian Xie,Hui Li,Kaixin Wei,Zhibin Xu,Zihui Meng,Xiu-Tian-feng E
Fluorine-containing compounds have proven to be effective coating materials for enhancing the combustion efficiency of aluminum micro-particles (Al MPs). However, these compounds are usually low-energy polymeric materials, which may inevitably diminish the overall energy density of propellants or explosives. This study introduces a two-step coating strategy using fluorinated energetic small-molecule 2-NCF to coat Al MPs, employing FeCl 3 as an intermediate layer. Compared to pristine Al MPs, 2-NCF coated Al MPs can reduce the ignition delay from 36 ms to 3 ms and shorten the time to maximum flame area from 551 ms to 114 ms, accompanied by intensified sparking combustion. Thermal analyses demonstrate that the energetic 2-NCF induces localized micro-explosions to disrupt the alumina shell, and the fluorinated segments produced by 2-NCF react with the aluminum, followed by β -AlF 3 to α -AlF 3 phase evolution, which sustains oxygen penetration for complete aluminum core oxidation to release more energy. The 2-NCF coating concurrently enhances hydrophobicity of Al MPs, elevating contact angles from 0° to 120°. This coating can effectively block water penetration and prevent hydrolysis of the inner aluminum during long storage. This work demonstrates the potential of 2-NCF as an excellent high-energetic coating material to enhance the combustion and hydrophobic performance of aluminum powder.
研究领域:
材料科学
·
燃烧学
·
表面化学
·
能源材料
·
推进剂化学
·
纳米技术
·
物理化学
✓ 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）