CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Yang Chen,Chengji Deng,Xing Wang,Jun Ding,Chao Yu,Hongxi Zhu
Si 3 N 4 -MgO-C refractories were prepared using fused magnesia, flake graphite, and Si powder-supported Fe(NO 3 ) 3 ·9H 2 O as the raw materials and phenolic resin as the binder under the flow of N 2 . The effect of different nitriding temperatures on the morphology and production of Si 3 N 4 in the uncatalyzed refractories was investigated. The effect of the morphology of β-Si 3 N 4 on the properties of the refractories with different catalyst contents was investigated. The oxidation resistance of the refractories was also investigated. The results showed that the increase in the nitriding temperature was beneficial for the formation of β-Si 3 N 4 in the refractories. However, very high nitriding temperatures generated a large number of pores in the refractories and deteriorated their properties. The refractory with 1 wt% catalyst exhibited good mechanical properties and oxidation resistance. However, the addition of excessive catalyst inhibited the formation of β-Si 3 N 4 and deteriorated the performance of the refractories.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Zhiqiang Yang,Ruirui Zhang,Fei Dai,Hongguo Tang,Ruixia Liu,Suojiang Zhang
To develop catalysts with superior stability for isobutane alkylation, La3+ exchanged FAU zeolites with varying framework Si/Al ratios were investigated. Based on the reaction performed in a continuous flow stirred tank reactor, a strong linear relationship between catalyst lifetime and strong Brønsted acid concentration was observed. Catalyst lifetime was speculated to change in an M-shaped pattern with respect to the framework Si/Al ratio, which implies there were at least two extreme Si/Al ratios in terms of catalyst stability. However, their product distribution differed significantly. LaFAU with a high Si/Al ratio led to enhanced acid strength, which resulted in higher cracking, self-alkylation activity, and poor product selectivity. In determining a balance between catalyst stability and product selectivity, a Si/Al ratio of ∼1.2 was selected as the optimal value for LaFAU zeolites.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Zhao,Pengjun Zhao,Qing Zhao,Donglin He,Wenwen Kong,Bing Wu,Aimin Chang
Herein, Mg–Al–Si–Ba–O-based glass ceramics were studied as potential candidates to protect Mn–Co–Ni–O-based negative temperature coefficient (NTC) thermistors at high temperatures such as 900 °C. The ceramics were prepared in three glass formulations (1#: 15MgO–15Al 2 O 3 -44.7SiO 2 –25BaO, 2#: 17MgO–17Al 2 O 3 –41SiO 2 –25BaO and 3#: 17MgO–17Al 2 O 3 –41SiO 2 –20BaO–5Y 2 O 3 (in mol%)) and their glass-transition temperatures ( T g ) were determined using the differential scanning calorimetry (DSC) method. Scanning electronic microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the parent glasses and glass-ceramic coatings. The sealing effects of the glass ceramics were examined by conducting an insulation test. The glass-ceramic sealing structures were subjected to 1000 thermal shock cycles at temperatures varying from room temperature to 900 °C. Notably, the sealing structure of glass-ceramic coating 1# was compact at a T g of 760.9 °C. The glass-ceramic coatings effectively maintained the NTC properties of the sensitive ceramics in all three formulations. Interestingly, the glass-ceramic coating 3# containing Y 2 O 3 demonstrated an increase in electrical resistance. Both the NTC thermistors coated with 1# and 2# glass formulations successfully passed 1000 thermal shock cycles without visible failures, and their resistance change ratios were well below the requisite 20%.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Li Chen,Jing Geng,Renhui Gao,Qianqian Xu,Zheng Guo
Metal oxide-based gas sensors encounter challenges in effectively detecting hazardous benzenes due to their stability and structural similarities. Here we report an innovative in situ growth method for synthesizing Fe 2 O 3 /Si-FeWO 4 heterostructure nanotubes (NTs) using highly negatively charged multivacant lacunary TBA 4 H 6 [SiW 9 O 34 ]·2H 2 O ( α -SiW 9 ) and Fe 3+ as precursors. A two-step process involving electrospinning followed by a thermal oxidation method was employed to synthesize a series of the uniform Si-FeWO 4 decorated Fe 2 O 3 heterostructure NTs. Considering the rich Fe 2 O 3 /Si-FeWO 4 active interfaces, rapid electron transfer, and high specific surface area, the optimal Fe 2 O 3 /Si-FeWO 4 based sensors demonstrate significantly higher sensitivity (S = 27.5) towards 50 ppm m-xylene in comparison to pristine Fe 2 O 3 (S = 1.8). Furthermore, the Fe 2 O 3 /Si-FeWO 4 exhibits excellent stability, humidity resistance, and high selectivity for m-xylene. This work offers an efficient, cost-effective strategy to synthesize Fe 2 O 3 /Si-FeWO 4 heterostructure NTs, with prospects for synthesizing other advanced sensing heterostructure nanomaterials with lacunary polyoxometalates as precursors.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Liang Zhou,Jianbao Hu,Yunhui Zhang,Le Gao,Wang Yuan,Han Luo,Yanmei Kan,Xiangyu Zhang,Jinshan Yang,Bin Wu,Xiaowu Chen,Shaoming Dong
To reduce the influence of TGO on EBCs performance, the Yb 2 SiO 5 -Yb 2 O 3 -Si-SiC ceramic was prepared by tape casting and reactive melt infiltration in this paper. During high-temperature water vapor corrosion, the ceramic formed a unique layered oxide layer structure to protect the material. On one hand, TGO is consumed by the reaction of Yb 2 O 3 and Yb 2 SiO 5 with SiO 2 ; On the other, the structure makes no TGO layer between the oxidized and unoxidized regions, which means that even if the TGO layer is stripped, the material still has a dense Yb 2 Si 2 O 7 and Yb 2 SiO 5 mixed layer as a protective barrier.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Physics
·
2023
·
IF 3.1
Zhang Lan,Yang Shuquan,Xiao Meihui,Chen Lin,Sun Jun,Ding Jianjun,Li Xiaoxiao,Gong Yi,Zheng Kang,Zhang Xian,Tian Xingyou
In this study, the performance of low-temperature sintered Bi-B-Si-Zn-Al glass/SiC composites by vacuum hot-press sintering between 700°C and 1000°C was investigated. The specimen had a relatively preferable density of 95.5% and thermal conductivity of 8.660 Wm−1K−1 after sintering at 900°C for 2 h. The dielectric constant and dielectric loss tangle of the composite were 32.9 and 0.57 at 20 GHz, respectively. The XRD analysis indicated the formation of Bi, Zn and ZnAl2O4 crystals, and the microstructure showed the low contact angle of the glass and SiC grain. Such low-temperature sintered SiC ceramic may have a promising application in the electronic field.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Haicheng Jiang,Qi Zhao,Panpan Wang,Jun Ma,Xuedong Zhai
Fabricating high-flux, low-fouling gravity-driven membranes (GDM) has proved to be an extremely challenging work. In this study, a novel tailored amphiphilic multi-arms polymer poly(propylene glycol)-silane-poly(ethylene glycol) (PPG-Si-PEG) was synthesized and blended into Polyvinylidene Fluoride (PVDF) matrix to fabricate GDM via nonsolvent induced phase separation method. The incorporation of multi-arms polymers affected phase separation and surface segregation behaviors, resulting in the formation of more porous structure, which were demonstrated by scanning electron microscopy (SEM). Moreover, the hydrophilic PEG arms in polymers were enriched onto membrane surface through surface segregation and utilized to improve the hydrophilicity of membranes, which were confirmed by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The separation and antifouling properties of the membranes were evaluated by using gravity as the driving force, employing bovine serum albumin (BSA) as the model foulant. The water flux of membranes increased from 4.6 L m −2 h −1 for the control membrane to 12.1 L m −2 h −1 for PVDF/PPG-Si-PEG∼5% membrane. The antifouling properties of modified membranes were effectively improved in comparison with that of control membrane. The flux recovery ratio, especially for PVDF/PPG-Si-PEG∼5% membrane, was up to 99.4%. This study provided a new method for antifouling modification of GDM.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Jinzhao Guan,Kaiyu Xie,Aimin Liu,Zhongning Shi,Gong Chen,Miroslav Boca
In this study, Al–Si alloy, a precursor of the solar-grade silicon , was prepared via the aluminothermic reduction–molten salt electrolysis of SiO 2 in KF–AlF 3 molten salt by employing liquid aluminum as the working cathode. The reaction mechanism of the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt at 750 °C was determined by thermogravimetry–differential scanning calorimetry. The reaction rate equation for the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt was: d α dt = 7.156 × 10 24 e − 4.688 × 10 5 RT ( 1 − α ) 1.734 . In 49.4 wt% KF–47.6 wt% AlF 3 –3 wt% SiO 2 molten salt at 750 °C, the Si content in the Al–Si alloy obtained by the aluminothermic reduction–molten salt electrolysis of SiO 2 was 24.53 wt%. Compared with solely aluminothermic reduction of SiO 2 , the current efficiency in the process of the aluminothermic reduction–molten salt electrolysis of SiO 2 was evaluated. The results reveal that the Al–Si alloy is predominantly prepared in the aluminothermic reduction step, while supplemented by electrolysis. The calculated Faradic current efficiency of the proposed aluminothermic reduction–molten salt electrolysis process was 28.4%.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 22
·225204
·
IF 3.874
Yali Liu,Xiaoxiang Wu,Wenxuan Guo,Mengge Li,Xinyue Niu,Jiadong Yao,Ying Yu,Boran Xing,Xiaoyuan Yan,Shucheng Zhang,Jian Sha,Yewu Wang
Heterojunction integrated by two-dimensional/three-dimensional materials has shown great potential applications in optoelectronic devices because of its fast response speed, high specific detectivity and broad spectral response. In this work, the vertical n-Si/p-GaTe heterojunction has been designed and fabricated, which shows a high responsivity up to 5.73 A W−1 and a fast response time of 20 μs at zero bias benifitting from the high efficiency of light absorption, internal photocurrent gain and strong built-in electrical field. A specific detectivity of 1012 Jones and a broad spectral response ranging from 300 to 1100 nm can also be achieved. This work provides an alternative strategy for high-performance self-powered optoelectronic devices.
研究领域:
光电技术
·
材料科学
·
半导体器件
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·4179-4189
·
IF 2.019
Han Xiaopeng,Huang Ying,Zhou Suhua,Sun Xu,Peng Xuanyi,Chen Xuefang
Due to the high agglomerate propensity of Si particles, making aluminum composites with a dispersion of the reinforcement using traditional way is still a challenge. In this study, an innovative approach was utilized to prevent the agglomeration of particles using encapsulating graphene sheets by grinding. Afterwards, the milled mixtures were incorporated with Cr-coated graphite flakes, urea and starch via mechanical mixing. After being mechanically mixed and sintered at 330 °C, the porous preform was fabricated by vacuum gas pressure infiltration. Effects of graphene content (0.5, 1, 3, 5 wt%) on the microstructures and properties of thermal and mechanical were investigated. Thermal conductivity and bending strength of the graphite flakes (G f )/Si/Al composites increased by 41.4 and 300%, respectively compared to the specimens without graphene. G f /Si/Al composites with graphene mass fraction of 5% had excellent in-plane thermal conductivity of 346 W/mK and bending strength of 84 Mpa, suggesting the composites can be applied as promising thermal management materials.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Libo Zhang,Lianxiang Qiu,Qingyao Zhu,Xiong Liang,Jingxiong Huang,Mengting Yang,Zhenxuan Zhang,Jiang Ma,Jun Shen
Water disinfection would result in unintended formation of halogenated disinfection by-products (DBPs) which pose potential harm to human health. In present work, Fe 78 Si 9 B 13 amorphous ribbons (Fe-Si-B AR ) showed excellent catalytic degradation performance towards an aromatic DBP, 3,5-dichlorosalicylic acid (3,5-DiClSA) by Fenton-like reaction. The catalytic degradation performances of Fe-Si-B AR , Fe 78 Si 9 B 13 crystalline ribbons (Fe-Si-B CR ) and iron powders towards 3,5-DiClSA were compared, and Fe-Si-B AR (0.0166 min −1 ) showed the fastest degradation rate. The faster surface mobility of Fe-Si-B AR , which made it easy for Fe 2+ to be oxidized by H 2 O 2 , facilitated the degradation process. High-valent iron of Fe IV could be generated which accounted for degradation of 3,5-DiClSA. The Fe-Si-B AR also showed better and better catalytic performance in 10 reuse cycles. Besides, the cytotoxicity tests indicated that the overall toxicity level of 3,5-DiClSA was declined by 88.1 % after degradation by Fe-Si-B AR . Our results showed that Fe-Si-B AR is a promising catalyst for the degradation of aromatic DBPs.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WOOD SCIENCE AND TECHNOLOGY
·
2023
·Vol. 57
·期 2
·523-535
·
IF 3.4
Zhou Yihang,Zhang Yue,Wang Kai,Hu Dongbo
Controls over the dimensions of waterlogged archaeological wood (WAW) upon drying are a critical issue for its conservation. Surface-initiated activator regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP) has been proven to be an effective consolidation method to increase the dimensional stability. However, the drawback of the current method is that the expansion stress generated during graft polymerization cannot be well controlled. An improved SI-ARGET ATRP system using a bifunctional monomer ethylene glycol dimethacrylate (EGDMA) to introduce a cross-linking process during the polymerization is presented in this paper. Both Pinus massoniana and Sapium sp. samples with different maximum moisture contents as 507% and 863%, respectively, show a reduced volumetric shrinkage of around 5% without any expansion phenomenon after the treatment. This method shows potential applications in the field of WAW conservation and may provide a new solution for consolidation of other organic archaeological objects as well as developing new wood-based materials.
研究领域:
考古学
·
材料科学
·
文物保护
✓ 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）