COMPOSITES SCIENCE AND TECHNOLOGY
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2020
·
IF 7.094
Hao Li,Jingzhe Zhao,Jianfeng Wang
Due to their extraordinary properties, two-dimensional boron nitride nanosheets (BNNSs) have great promise for a wide range of applications. To progress from the laboratory to commercial applications, the key is to develop a simple process to massively produce BNNSs as well as their macroscopic materials. Herein, an extremely simple, straightforward paste-based sand-milling exfoliation strategy is developed to produce BNNSs paste on a kilogram scale from bulk hexagonal boron nitride . A total-conversion exfoliation with ultrahigh concentration (22 wt%) and production rate (1.833 g h −1 ), one to four orders of magnitude higher than those in previous reports, is achieved. The exfoliation does not require any assisted chemicals (strong oxidizing acids, strong alkalis, intercalants or surfactants), and thus avoids subsequent purification treatments. Further, convenient and fast paste-based processing methods including sol-gel-film transformation, doctor blading, and foam infiltration are developed to massively produce BNNSs composite materials which present outstanding mechanical, thermoconductive and flame-retardant properties. The present paste-based strategy to produce BNNSs and their composite materials has prominent advantages over conventional solution-based strategy in simplicity, yield, concentration, throughput, production rate and solvent consumption, and thus paves the way for the commercial application of BNNSs.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Guohua Wang,Yicheng Wang,Guoqiang Lu,Shiyu Dong,Ruifen Tang,Yingying Zhao,Jun Nie,Xiaoqun Zhu
Hydrogel tubes made of sodium alginate (SA) have potential applications in drug delivery, soft robots, biomimetic blood vessels, tissue stents, and other fields. However, the continuous preparation of hollow SA hydrogel tubes with good stability and size control remains a huge challenge for chemists, material scientists, and medical practitioners. Inspired by the plant apical growth strategy, a new method named soft cap-guided growth was proposed to produce SA hydrogel tubes. Due to the introduction of inert low gravity substances, such as air and heptane, into the extrusion needle in front of calcium chloride solution to form a soft cap, the SA hydrogel tubes with controllable sizes were fabricated rapidly and continuously without using a template through a negative gravitropism mechanism. The SA hydrogel tubes had good tensile strength, high burst pressure, and good cell compatibility. In addition, hydrogel tubes with complex patterns were conveniently created by controlling the motion path of a soft cap, such as a rotating SA bath or magnetic force. Our research provided a simple innovative technique to steer the growth of hydrogel tubes, which made it possible to mass produce hydrogel tubes with controllable sizes and programmable patterns.
研究领域:
材料科学
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化学
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生物医学工程
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组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2024
·
IF 4.1
Yi Liu,Kaishi Ding,Xiao Fan,Sixing Chen,Shengyan Meng,Jiahui Yan,Yunlei Gao,Jinming Lu,Yi Liu
Despite that oriented MFI zeolite films exhibit significant prospects for a wide range of applications due to microstructural superiority, their precise orientation control entails rigorous demands on reaction conditions (e.g., reaction temperature). In this work, we achieved facile synthesis of continuous b -oriented MFI zeolite films with few twins over a wide crystallization temperature range of 30–210 °C through adopting NH 4 F-mediated gel as nutrient during epitaxial growth. Both ammonium ions and fluorine ions were found crucial for enhancing the gel reactivity, endowing epitaxial growth with higher crystallization rates; moreover, the above morphology could be maintained even under fluctuating temperature conditions during film processing, thereby showing great potential for their bath production in a facile and reproducible manner.
研究领域:
材料科学
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化学工程
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催化
✓ 已验证
DOI
高影响因子
NATURE MATERIALS
·
2025
·Vol. 24
·期 2
·188-196
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IF 38.5
Jiang He,Zhang Xiankun,Chen Kuanglei,He Xiaoyu,Liu Yihe,Yu Huihui,Gao Li,Hong Mengyu,Wang Yunan,Zhang Zheng,Zhang Yue
Batch production of single-crystal two-dimensional (2D) transition metal dichalcogenides is one prerequisite for the fabrication of next-generation integrated circuits. Contemporary strategies for the wafer-scale high-quality crystallinity of 2D materials centre on merging unidirectionally aligned, differently sized domains. However, an imperfectly merged area with a translational lattice brings about a high defect density and low device uniformity, which restricts the application of the 2D materials. Here we establish a liquid-to-solid crystallization in 2D space that can rapidly grow a centimetre-scale single-crystal MoS 2 domain with no grain boundaries. The large MoS 2 single crystal obtained shows superb uniformity and high quality with an ultra-low defect density. A statistical analysis of field effect transistors fabricated from the MoS 2 reveals a high device yield and minimal variation in mobility, positioning this FET as an advanced standard monolayer MoS 2 device. This 2D Czochralski method has implications for fabricating high-quality and scalable 2D semiconductor materials and devices.
研究领域:
材料科学
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半导体技术
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纳米技术
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电子器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Hao Tian,Jie Ma,Bai Yang,Ran Li,Ronghai Yu
It is necessary to broaden absorption bandwidth, regulate applied frequency, reduce the weight and maintain strong absorption for magnetic microwave absorbing materials by constructing suitable material structures to satisfy the requirements for wide applications in various electromagnetic devices. In this work, well-structured amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites have been fabricated using a selective chemical reduction in a mixed aqueous solution containing Co 2+ and Nd 3+ ions along with GO sheets reduced by NaBH 4 as the reductant, in which only Co 2+ and GO but no Nd 3+ ions were reduced. Very low coercivity of 0.4 Oe is achieved in amorphous-Co@Nd(BO 2 ) 3 /rGO nanocomposites due to amorphous Co@Nd(BO 2 ) 3 core-shell nanoparticles uniformly anchored on rGO sheets. These soft magnetic rGO-based nanocomposites exhibit high-frequency microwave absorption performance including a minimum reflection loss ( RL min ) value of −84.09 dB at 15.38 GHz for a 2.1 mm thickness at an applied frequency range (12.31–18 GHz) covering almost the entire Ku band. Moreover, a much wider absorption band of 7.24 GHz (10.67–17.89 GHz, RL ≤ −10 dB) with a 2.3 mm thickness along with a RL min value of −35.92 dB is also achieved. These rGO-based magnetic composites also show good structural stability , low density and easily controlled material compositions along with facile chemical fabrication suitable for mass production, which promises their latent use in high-performance microwave absorbing devices. Crystallization behavior of a new amorphous Nd(BO 2 ) 3 phase was also investigated.
研究领域:
材料科学
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电磁工程
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纳米技术
✓ 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）