SURFACE & COATINGS TECHNOLOGY
·
2016
·
IF 2.139
Yun Chen,Yali Hao,Wei Huang,Yan Ji,Wenzhong Yang,Xiaoshuang Yin,Ying Liu,Xiang Ling
Ni-P-nano-Al 2 O 3 composite coatings on the mild steel were obtained by adding Al 2 O 3 nanoparticles into the traditional electroless Ni-P bath. Cationic and anionic surfactants were used to prevent the agglomeration of the incorporated nano-Al 2 O 3 . Surface morphology , compositions and microstructures of the coating were studied using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) as well. Corrosion resistances of the modified mild steel samples were evaluated in 3.5 wt.% NaCl solution by electrochemical impedance spectroscopy (EIS). The results showed that compared to the pure Ni-P coating on the mild steel, the coating formed in the bath with 6 g/L nano-Al 2 O 3 performed the highest resistance. Under the optimal conditions, the adding of anionic surfactant (SDBS) improved the anti-corrosion performance of the samples further, while the addition of cationic surfactant led to a worse corrosion resistance. The potential mechanism was that anionic surfactant molecules would contact with active sites of Ni-P composite coating and nano-Al 2 O 3 in the bath, which would improve the dispersion of nano-Al 2 O 3 , thus leading to a homogeneous coating with better corrosion resistance.
研究领域:
材料科学
·
腐蚀工程
·
表面涂层
·
电化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2026
·
IF 4
Yueqi Wang,Yu Niu,Qinglian Wang,Wang Yin,Yixiong Lin,Ting Qiu,Jiafang Gu,Chen Yang
Liquid organic hydrogen carriers (LOHCs) are considered one of the ideal media for hydrogen storage and transportation. Achieving efficient cyclic utilization of LOHCs necessitates the development of highly active dehydrogenation catalysts. This work focuses on optimizing Pt/θ-Al2O3 catalysts for the dehydrogenation of Perhydro Benzyltoluene (H12-BT). Catalysts with Pt loadings ranging from 0.3 to 5.0 wt% were synthesized via impregnation, yielding Pt particle sizes between 2.1 and 7.1 nm. Surface acidity was systematically tuned by introducing nitric acid (HNO3) during impregnation, with HNO3/Pt molar ratios (n) varying from 0 to 24. Dehydrogenation testing revealed a distinct volcano-shaped dependence on Pt particle size. The peak activity, corresponding to 3.0 nm particles at 1 wt% loading, reached a dehydrogenation degree (DoDH) of 48.3% under optimal conditions (250 °C, 4h). HNO3 modification (n = 12) further enhanced performance under the same conditions, elevating the DoDH to 58.7%. Studies of the adsorption behavior revealed that the size effect competes with geometric and electronic influences: small Pt particles (<3nm) facilitated H12-BT adsorption but impeded product H2 desorption, whereas large particles (>5nm) exhibited insufficient active sites despite enhanced H2 desorption. Concurrently, optimized Lewis acid site distribution and strength dynamically balanced H12-BT adsorption capacity and product desorption behavior. This work elucidates the interplay between Pt particle size, acid site distribution, and adsorption-desorption behavior, providing a framework for designing efficient LOHCs dehydrogenation catalysts.
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DOI
高影响因子
Materials
·
2026
·Vol. 19
·期 18
·3811
·
IF 3.7
Haiming Li,Ziqiu Cheng,Zhenzhen Zhou,Chen Hu,Junhao Ye,Dong Huang,Yanbin Wang,Tingsong Li,Heng Liu,Shisheng Lin,Denis Yu. Kosyanov,Daqin Chen,Duyou Lu,Jiang Li
HighlightsHigh sintering activity Al2O3-Ce:LuAG nanopowders were prepared via a co-precipitation method.Ceramics vacuum-sintered at 1750 °C for 10 h exhibited excellent thermal stability (I450K/IRT= 96%).The thermal conductivity of the “1750 °C × 10 h” sample was 15.6 W·m−1·K−1at room temperature.Al2O3particles are uniformly dispersed in the Ce:LuAG matrix.Luminous efficacy reached 286 lm/W, with a saturation threshold at 18 W·mm−2.Despite the success of using Al2O3as a secondary phase in Ce:LuAG phosphor ceramics (PCs), there is still room for improvement in the compositional design of biphasic PCs, as well as in their luminescent and thermal performance. In this study, nanopowders with 40 wt.% Al2O3-0.4at.% Ce:LuAG stoichiometry were synthesized via a co-precipitation approach. Subsequently, a series of compositionally uniform PCs was successfully fabricated by adjusting the vacuum sintering temperature and dwelling time. The grain size distributions of the Al2O3and LuAG phases, as well as the evolution of porosity and pore size, were systematically analyzed and correlated with the sintering conditions. The addition of Al2O3has been demonstrated to enhance the thermal properties of ceramics. The thermal conductivity of the “1750 °C × 10 h” sample was 15.6 W·m−1·K−1at room temperature. Concurrently, it exhibited excellent thermal quenching behavior, retaining 96% of its luminescence intensity upon heating to 450 K. Its fluorescence lifetime was determined to be 21.06 ns. Under 450 nm laser excitation, the optimized PC attained a luminous efficacy of 286 lm·W−1at 1 W·mm−2. In addition, the luminous flux increased continuously with laser power from 1 to 20 W·mm−2without any sign of saturation, reaching a maximum of 2500 lm. The findings indicate that biphasic 40 wt.% Al2O3-0.4at.% Ce:LuAG PCs have potential as high-flux, green-color converters for next-generation high-power laser lighting. Furthermore, a laser illumination prototype device incorporating 40 wt.% Al2O3-0.4at.% Ce:LuAG ceramic samples and a 10 W blue laser was constructed. This device emits white light with an illumination range exceeding 500 m, thereby demonstrating its potential applications in laser-driven lighting.
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Yu Liu,Boyi Chen,Chuanrong Liu,Yirui Chen,Liuru Liu,Bo Wang,Quan Zhu
Using passivation coating to inhibit coking is key for applying active cooling technology in high-speed aircraft. However, the anti-coking performance of coatings during the repeated fuel pyrolysis and decoking processes is the focus of research. Herein, Al 2 O 3 coatings prepared by atomic layer deposition were characterized to explore the improvement effect of anti-coking and reusability. These properties were analyzed via repeated use of n -decane pyrolysis and coke oxidation removal experiments. The dense and smooth coatings obtained by adjusting the number of deposition cycles exhibit an amorphous Al 2 O 3 crystal structure at 200 °C, which can prevent contact between the coking precursors and metal active sites, achieving the anti-coking rate of about 90 %. The characterization results reveal that coating maintains the integral structure after the decoking treatment. The partial transformation of Al 2 O 3 crystalline phase into intermediate phases under high-temperature conditions leads to an increase in surface acidic sites, accelerating the catalytic cracking and promoting the formation of filamentous coke with higher graphitization degree. However, the coking inhibition efficiency of coating remains above 80 % after several coking and decoking cycles. The present work provides new insights into the application of anti-coking coating prepared at low temperatures in the reusable coking and decoking process.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 35
·期 1
·1-13
·
IF 2.8
Sun Qin,Yang Wanchun,Hu Zhongyu,Jia Gaozhi,Wang Yangyang
Copper pastes are widely used in metallization of ceramic surfaces but are limited by poor oxidation resistance, high resistivity, and low bonding strength. In this work, the 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass powder was prepared by the melt-quenching method. A copper paste containing the glass powder and formic acid-treated copper microparticles was used for metallization of α -Al 2 O 3 ceramic surface. The copper thick films were obtained by low-temperature sintering after screen printing. The effects of the glass powder contents on resistivities and shear strengths of the copper films on α -Al 2 O 3 ceramic substrate were analyzed. The microstructures of the copper thick films and the interfacial bonding mechanism on the α -Al 2 O 3 ceramic surface were investigated in detail. The copper thick film with 10-wt% 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass and sintered at 650 °C for 20 min exhibited a low resistivity (3.38 ± 0.94 µΩ cm) and a high shear strength (35.24 ± 1.2 MPa). ZnAl 2 O 4 and Bi 2 B 4 O 9 were detected on the edges of the copper film near the interface, which enhanced interfacial binding between the copper thick films and the α -Al 2 O 3 ceramic substrate. These results demonstrated that the low-temperature sintering copper paste containing 30Bi 2 O 3 –55B 2 O 3 –15ZnO glass was effective for α -Al 2 O 3 ceramic surface metallization.
研究领域:
材料科学
·
陶瓷
·
冶金学
·
电子封装
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Xiuyong Chen,Jianhui Yuan,Jing Huang,Kun Ren,Yi Liu,Shaoyang Lu,Hua Li
This study aims to further enhance the anti-corrosion performances of Al coatings by constructing superhydrophobic surfaces. The Al coatings were initially arc-sprayed onto steel substrates, followed by deposition of polyurethane (PU)/nano-Al 2 O 3 composites by a suspension flame spraying process. Large-scale corrosion-resistant superhydrophobic PU/nano-Al 2 O 3 -Al coatings were successfully fabricated. The coatings showed tunable superhydrophilicity/superhydrophobicity as achieved by changing the concentration of PU in the starting suspension. The layer containing 2.0 wt.%PU displayed excellent hydrophobicity with the contact angle of ∼151° and the sliding angle of ∼6.5° for water droplets. The constructed superhydrophobic coatings showed markedly improved anti-corrosion performances as assessed by electrochemical corrosion testing carried out in 3.5 wt.% NaCl solution. The PU/nano-Al 2 O 3 -Al coatings with superhydrophobicity and competitive anti-corrosion performances could be potentially used as protective layers for marine infrastructures. This study presents a promising approach for fabricatiing superhydrophobic coatings for corrosion-resistant applications.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
·
海洋工程
·
高分子材料
·
金属涂层
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 16
·23258-23265
·
IF 5.532
Jianlong Chai,Yabin Zhu,Xing Gao,Tielong Shen,Lijuan Niu,Shufen Li,Peng Jin,Minghuan Cui,Zhiguang Wang
Al 2 O 3 /SiC ceramic composites with different SiC contents have been prepared by powder metallurgy at 1600 °C for 120 min at 30 MPa pressure. The effect of second phase particles on the microstructure and mechanical properties of composites have been studied. The results show that SiC particle has a significant impact on the matrix subjected to residual stress, and on the microstructure of the composites as well. The average grain size of alumina matrix decreases as the SiC particle content increases. Simultaneously, it has been found that the mechanical properties of the material are significantly enhanced in comparison with monolithic Al 2 O 3 . The highest strength and toughness are obtained when the SiC content is 15 vol%, and the values are 1237 MPa and 5.68 MPa m 1/2 , respectively. The mechanisms of strengthening and toughening have been discussed.
研究领域:
材料科学
·
陶瓷学
·
复合材料工程
·
固态物理
·
粉末冶金
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 16
·11323-11333
·
IF 3.9
Xiangyu Tan,Zhongqiang Zhao,Zhimin Na,Ran Zhuo,Fangrong Zhou,Dibo Wang,Longchang Zhu,Yi Li,Shaocong Hou,Xin Cai
Silicon–carbon composites have been recognized as some of the most promising anode candidates for advancing new-generation lithium-ion batteries (LIBs). The development of high-efficiency silicon/graphene anodes through a simple and cost-effective preparation route is significant. Herein, by using micron silicon as raw material, we designed a mesoporous composite of silicon/alumina/reduced graphene oxide (Si/Al2O3/RGO) via a two-step ball milling combined annealing process. Commercial Al2O3 nanoparticles are introduced as an interlayer due to the toughening effect, while RGO nanosheets serve as a conductive and elastic coating to protect active submicron silicon particles during lithium alloying/dealloying reactions. Owing to the rational porous structure and dual protection strategy, the core/shell structured Si/Al2O3/RGO composite is efficient for Li+ storage and demonstrates improved electrical conductivity, accelerated charge transfer and electrolyte diffusion, and especially high structural stability upon charge/discharge cycling. As a consequence, Si/Al2O3/RGO yields a high discharge capacity of 852 mA h g−1 under a current density of 500 mA g−1 even after 200 cycles, exhibiting a high capacity retention of ∼85%. Besides, Si/Al2O3/RGO achieves excellent cycling reversibility and superb high-rate capability with a stable specific capacity of 405 mA h g−1 at 3000 mA g−1. Results demonstrate that the Al2O3 interlayer is synergistic with the indispensable RGO nanosheet shells, affording more buffer space for silicon cores to alleviate the mechanical expansion and thus stabilizing active silicon species during charge/discharge cycles. This work provides an alternative low-cost approach to achieving high-capacity silicon/carbon composites for high-performance LIBs.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
复合材料
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Da Wang,Zhong Wang,Guangci Li,Xuebing Li,Bo Hou
SiO2-modified high thermal conductivity Al2O3@Al composites were synthesized and supported cobalt for Fischer–Tropsch synthesis to improve the catalytic performance and intensify the heat transfer within a fixed-bed reactor. FTS results showed that the CO conversion and C5+ selectivity increased whereas CH4 selectivity decreased, which could be attributed to the reduced metal–support interaction via modification of SiO2 on the surface of Al2O3@Al. The heat transfer coefficients of the Co/SAl2O3@Al–x were more than 30 times those of conventional Co/Al2O3 according to the laser flash measurement. The thermal conductive study showed that a homogeneous radial temperature gradient was maintained within the catalyst bed for Co/SAl2O3@Al-x even without using a heat diluter, indicating good thermal conductivity within the reactor. In addition, the temperature of the catalyst bed for Co/SAl2O3@Al-x was easier to reach a “steady state” compared to the reactor packed with traditional low thermal conductive Co/Al2O3, which could improve the operating flexibility of FTS.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 10
·e202204379
·
IF 2.1
Yang Wang,Xinbao Li,Pan Li,Xinbo Zhu,Geng Chen,Yingying Zhu
Graphical Acetic acid is a main component of biomass pyrolysis oil. A high yield of hydrogen is obtained through steam reforming of acetic acid over a tungsten-modified Co/Al 2 O 3 catalyst. The interaction between the reactants and the catalyst surface is enhanced. Steam reforming of bio-oil is a promising green hydrogen production technology. Experimental and theoretical calculations have been carried out to study the performance of Co/Al 2 O 3 catalysts doped with tungsten (1–10 wt%) for bio-oil model compound acetic acid steam reforming. The maximum acetic acid conversion of 95.4 % and H 2 yield of 93.5 % were obtained over the 15Co-5W/Al 2 O 3 catalyst under the optimized reaction conditions of temperature=550 °C, steam to carbon ratio=5 and the gas hourly space velocity of 15,780 h −1 . The feeding capacity of the catalyst was improved by 2.3 times by the addition of 5 wt% W compared to that of the non-W-added Co/Al 2 O 3 catalyst. Catalyst characterizations by BET, XRD, H 2 -TPR, XPS, HRTEM, and SEM were performed. The results showed that high activities were maintained over 20 h on the 15Co-5W/Al 2 O 3 catalyst. A little filamentous coke was formed on the spent catalyst surface, and the agglomeration rate of active Co was relatively low. Density functional theory calculations confirmed that the adsorptions of CH 3 COOH and H 2 O on the catalyst were enhanced by the addition of W.
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Wenzhuo Xue,Zilong Xiong,Yupeng Chen,Feihu Tan,Hongyu Yu
High frequency performance and the content of glass are the direct factors affecting the performance of LTCC . In order to reduce the content of glass and improve the performance, we conducted a systematic study on the composition regulation of B 2 O 3 -La 2 O 3 -ZnO (BLZ) glass. Glass with low softening point is helpful for LTCC to achieve compact structure. DSC shows that the softening point of BLZ glass can be reduced from 580 ℃ to 537 ℃ by adjusting the composition. XRD analysis indicate that the glass and Al 2 O 3 formed ZnAl 2 O 4 interfacial phases. Combined with the thermal shrinkage curve, it can be proved that the softening of glass and the formation of interfacial phases are the reasons for the shrinkage and densification of LTCC. The lowest coefficient of thermal expansion of 2.878 ppm/℃ was obtained, and the minimum loss of LTCC is 0.00277 at 15 Ghz. These properties are making LTCC more suitable for high-frequency applications.
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Nan Hu,Lin Chen,Yunpeng Li,Nan Yao,Huizhen Li,Zhijun Zhang
Nowadays, developing an efficient, economical, and sustainable method for separating bioactive phytochemicals from plants extracts has gained increasing attention. Rosmarinic acid (RA) with potent biological activities was successfully isolated by foam fractionation from the extract of perilla ( Perilla frutescens L.) leaves. To achieve the adsorption of RA without surface activity on the stable air-water interface, γ-Al 2 O 3 nanoparticles (ANPs) modified by cocamidopropyl betaine (CAPB) were prepared and used as the nano-frother and nano-collector. After optimization of water extraction of RA, ANP–CAPB was characterized by SEM-EDS, FTIR, XPS, surface charge, and hydrophobicity analyses. The effects of ANP-CAPB with various modified degrees on the foam property and collection property were examined systematically. On the one hand, ANP-CAPB was colloidally stable, and it could generate stable foams due to the introduction of hydrophobic chains on the ANP surface. On the other hand, ANP-CAPB displayed excellent collection towards RA, and the adsorption kinetics and isotherm of this process followed the pseudo-second-order model and Freundlich model, respectively. Moreover, reasonable mechanisms were proposed to elucidate the modification and adsorption behavior. Under the suitable conditions of 400 mg/L ANP-CAPB and pH 5.0, the enrichment ratio and the recovery percentage of RA were 59.07% and 93.33%, respectively. Furthermore, the RA product showed promising antioxidant potential and significant antibacterial activity. This work not only described an efficient foam fractionation for RA isolation, but it also offered valuable clues for the separation study of other plant extracts.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）