SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Siyuan Jin,Jie Zhou,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Neshchimenko Vitalii,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
A multi-structured composite coating with superhydrophobic properties, corrosion resistance, and wear resistance was prepared on the surface of Mg-9Li-3Al alloy. A porous layer was formed on the substrate surface via micro-arc oxidation. Then, LDH was grown in situ on the MAO coating surface through hydrothermal treatment, sealing the pores in the coating. Finally, HDTMS-SiO₂ was assembled on the LDH surface. The SiO₂ formed an island-like micro-nano structure, trapping air and creating an “air cushion” on the coating surface，imparting superhydrophobicity (contact angle and sliding angle of 162.1 ± 2.1° and 4.2 ± 0.2°). And the corrosion resistance of the MLS coating is significantly improved the corrosion current density decreased by three orders of magnitude. The incorporation of HDTMS-SiO₂ not only improved the corrosion resistance of the coating but also significantly enhanced its wear resistance. During friction, the SiO₂ nanoparticles acted as “ball bearings,” shifting the friction mode from sliding to rolling. The fragmented SiO₂ further served as a solid lubricant, reducing the coefficient of friction to 0.11.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 21
·13251-13260
·
IF 4.036
Xinglong Li,Mingming Li,Yuxin Liu,Yisi Feng,Pan Pan
5-Hydroxymethylfurfural (HMF) is one of the most important platform molecules and could be transformed into a variety of fuel additives and high value-added chemicals. Multiple catalyst systems have been developed for the conversion of carbohydrates to HMF, but there are still unavoidable problems, including high temperature and pressure, difficult recovery of solvent, corrosion of equipment, poor catalyst circulation, etc. Herein, a new magnetic Fe3O4@SiO2@mSiO2-TaOPO4 catalyst for the preparation of HMF from fructose in 2-pentanol was developed. The structures of the catalysts were characterized by FT-IR, TSM, EDS, SEM, XRD and VSM. The 2-pentanol solvent is not only conducive to the production of HMF, but also enables the reaction to be carried out at a lower pressure. The highest yield of HMF (85.4%) was obtained using 20 wt% catalyst under 10% substrate concentration (0.5 g of fructose) at 120 °C for 3 h. The catalysts can be easily separated by magnetism. The slight decrease in catalyst activity after 7 cycles was mainly due to the loss of catalyst during the cycle operation. Simultaneously, the total yield of HMF was 51.3% after scale-up to 15 g of fructose, showing the possible industrial application potential of this catalyst system.
研究领域:
化学工程
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催化材料
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2018
·Vol. 25
·期 6
·624-629
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IF 1.126
Huang Ke-yu,Dong Ya-qiang,Liu Min,Ren Ji-hang,Lu Shu-han,Zhao Zhan-kui,Chang Chun-tao,Wang Xin-min
Amorphous powder cores based on spherical (Fe 0.76 Si 0.09 B 0.1 P 0.05 ) 99 Nb 1 amorphous powder and their SiO 2 layer prepared by in situ coating insulation process were investigated in detail. These cores were characterized by scanning electron microscopy and X-ray diffraction analyses, and the results revealed that the surface layer of the amorphous powder was composed of SiO 2 with uniform surface coverage. The thickness of the SiO 2 insulating layer could be controlled by adjusting the tetraethyl orthosilicate (TEOS) content. By cold-pressing with epoxy resin under a pressure of 1800 MPa, a ring powder core with an outer diameter of 20.3 mm, inner diameter of 12.7 mm, and height of 5.3 mm was prepared. The FeSiBPNb composite core showed its best properties when the TEOS content was 2 mL/g (the volume of TEOS for each gram of (Fe 0.76 Si 0.09 B 0.1 P 0.05 ) 99 Nb 1 amorphous powder, mL/g), which showed good relative permeability in the high-frequency range of up to 10 MHz and a low core loss of 320 W/kg under the maximum magnetic flux density of 0.1 T and frequency of 100 kHz.
研究领域:
材料科学
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磁学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·107
·
IF 3.426
Qinqin Zhang,Xiaoqi Lin,Weisheng Chen,Heng Zhang,Dezhi Han
Many achievements have been made on the research of composite polyurethane foams to improve their structure and mechanical properties, and the composite foams have been widely utilized in building insulation and furniture. In this work, rigid polyurethane foams (RPUFs) with the addition of different fillers (nano-SiO2, peanut shell, pine bark) were prepared through the one-step method. The effects of inorganic nano-SiO2and organic biomass on foam properties were evaluated by means of physical and chemical characterization. The characterization results indicate that the compressive strength values of prepared foams could fully meet the specification requirement for the building insulation materials. The inorganic and organic fillers have no effect on the hydrogen bonding states in composite RPUFs. Furthermore, compared to the biomass fillers, the addition of nano-SiO2greatly influenced the final residual content of the fabricated foam. All composite foams exhibit closed-cell structure with smaller cell size in comparison with the parent foam. The prepared composite foams have the potential for utilization in building insulation.Keywords:rigid polyurethane foam;peanut shell;pine bark;nano-SiO2;insulation materials
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE ENGINEERING
·
2022
·
IF 2.451
Sang Xiong,Ruo-tian Wang
Europium nitrate, ammonium tungstate and hexadecyl trimethyl ammonium bromide were used, and Eu-doped WO3 (WO3:Eu3+) nanopowder was synthesized by the micro-emulsion method. Tetraethyl silicate was hydrolysed into SiO2 and WO3:Eu3+ nanopowder coated with SiO2 (SiO2/WO3:Eu3+) was obtained. The microstructure and morphology of the prepared nano-SiO2/WO3:Eu3+ powders were characterized by XRD, SEM, TEM and HRTEM. Results showed that the prepared nano-SiO2/WO3:Eu3+ powders composed of WO3 of monoclinic and SiO2 of amorphous, which was spherical and granular, and the grain size reaches 50 nm. The tribological behaviour of nano-SiO2/WO3:Eu3+ as extreme pressure and anti-wear additive in the water-based fluid was studied by a four-ball machine. The results demonstrate that nano-SiO2/WO3:Eu3+ exhibits superior load-bearing capacity, anti-wear and anti-friction performance in water-based fluid, especially when the optimal concentration of nano-SiO2/WO3:Eu3+ is 0.4 wt-%. WSD, COF and wear volume of the nano-SiO2/WO3:Eu3+ decreased by 62.43%, 30.20% and 67.34%, respectively, compared with that of the water-based fluid.
研究领域:
材料科学
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摩擦学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Shuang Guo,Shuxue Zhou,Huijing Li,Bo You
This paper presents a facile method to fabricate volumetric light diffusing films with high transmittance and haze simultaneously by mimicking the micro- and nanostructure of compound eyes. Strawberry-like polymethyl methacrylate/SiO 2 composite microspheres were first prepared via the electrostatic attraction between positively charged PMMA spheres and negatively charged SiO 2 nanoparticles , and further blended with polyacrylate latex to produce light diffusing coatings. A novel light diffusing film with hemispherical surface was built by casting the light diffusing coatings on optical-grade PET film. Effects of the sizes of PMMA spheres and SiO 2 nanoparticles on the optical properties of light diffusing film were investigated by a haze meter and application on a LED lamp. The best result (transmittance 94.6% and haze 84.2%) was achieved for the strawberry-like composite microspheres based on 1 μm PMMA spheres and 50 nm SiO 2 nanoparticles. The light-diffusing mechanism of the strawberry-like microspheres in the film was discussed.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 6
·1385
·
IF 4.6
Xia Zhang,Bo Xiao,Yongzhao Hou,Guangwu Wen
In this paper, polymethylhydrosiloxane (PMHS) and ethanol were used as raw materials to synthesize the ceramic precursor of side ethoxy polysiloxane (PESO) using dehydration and a dealcoholization reaction, which had a ceramic yield of 87.15% and a very low residual carbon content. With the quartz fiber as a reinforcer, the silica matrix composites (SiO2f/SiO2) with a double-layer interface (PyC-SiO2/BNNSs) coating were manufactured using precursor impregnation pyrolysis (PIP). The as-prepared SiO2f/SiO2possessed an excellent mechanical property, which exhibited obvious fiber pull-out and debonding phenomena from a fracture morphology. The flexural strength and fracture toughness of SiO2f/SiO2reached 63.3 MPa and 2.52 MPa·m1/2, respectively. Moreover, the SiO2f/SiO2had suitable dielectric properties, with a dielectric constant of about 2.5 and a dielectric loss of less than 0.01. This work provides an important concept for the enhancement of the dielectric properties and mechanical properties of quartz fiber-reinforced ceramic matrix composites, as well as in the preparation of wave-transmissivity composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yu Wang,Fang Zhao,Jie Wang,Ali Raza Khan,Yulin Shi,Zhang Chen,Kaiqiang Zhang,Li Li,Yanfeng Gao,Xuhong Guo
VO2/PNIPAm hybrid thermochromic material has been verified as promising to improve optical performance of smart windows. However, VO2 can be easily oxidized especially when being dispersed in the hydrogel matrix, and also the nonuniform dispersion of VO2 in a host will worsen the material’s optical performance. Herein, pure VO2(M)@SiO2 nanoparticles (NPs) were first prepared using a surfactant-free method. Then VO2(M)@SiO2/PNIPAm hybrid microgels were synthesized through suspension polymerization. The VO2(M)@SiO2 NPs in the hydrogel matrix exhibited obviously improved resistance to oxidation. Monodispersed hybrid microgel with uniformly distributed VO2(M)@SiO2 NPs (Sample I) was obtained. Meanwhile, compared with the best VO2 film reported, our composite microgel (Sample III) demonstrated a 164% increase in the solar modulating ability at a relatively high average luminous transmittance (38.4%). All these remarkable features of VO2(M)@SiO2/PNIPAm microgel synthesized in our work will help a lot in the practical application of the inorganic–organic hybrid nanothermochromic materials.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Qianwen Zhu,Yifan Yue,Xiejun Wang,Baohe Wang,Jing Zhu,Jing Ma
In view of the drawbacks of small specific surface area, poor thermal stability, and easy decomposition, CsPAV was modified by the organic ammonium source dimethyl diallyl ammonium chloride (DMDAAC). A series of (DMDAAC)CsPAV/SiO2 catalysts with different (DMDAAC)CsPAV loadings were prepared by an impregnation method. When DMDAAC-modified CsPAV was supported on SiO2, it exhibited a high specific surface area and more active sites. The catalytic performance of (DMDAAC)CsPAV/SiO2 was investigated by methacrolein (MAL) oxidation to methacrylic acid (MAA). The performance of the catalyst was characterized by FT-IR, XRD, TG, NH3-TPD, NMR, and XPS. There was an interaction between SiO2 and (DMDAAC)CsPAV, and the NH4+ crystalline salt was formed in the process of calcination from DMDAAC. The interaction between the formed NH4+ and SiO2 carrier prevented the decomposition of CsPAV. (DMDAAC)CsPAV/SiO2 showed high stability, and the catalytic performance was stable in the long-term evaluation test. Under the optimum conditions, the conversion of MAL was 80.8%, and the selectivity to MAA was 89.1% for 50(DMDAAC)CsPAV/SiO2.
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
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hu Wang,Jiangchao Chen,Pengfei Pang,Yiran Bai,Zhiqiang Zheng,Tao Huang,Kunpeng Jiang,Yunyun Zhao,Guisheng Zhu,Huarui Xu
The development of lithium-metal batteries (LMBs) with high energy density and safety is considered a top priority for the next generation of rechargeable batteries. However, the mitigation of the inevitable reaction between lithium and the liquid electrolyte (LE), as well as the subsequent formation of Li dendrites, poses a crucial challenge that needs to be addressed. Upgrading traditional LEs serves as a pivotal strategy in achieving this objective. Here, we report a ZIF-8@SiO 2 /PVDF-HFP (ZSPH) quasi-solid electrolyte (QSE) with ultra-multistage pore crosslinked network structure. The interconnected micro-stage pore structure in a honeycomb-like morphology of polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) and the rich multistage pore structure of nanoscale SiO 2 “armored” zeolite imidazolium ester backbone-8 (ZIF-8@SiO 2 ) collectively establish a multi-stage ion transport channel. This unique structure facilitates appreciable ionic conductivity (2.21 × 10 −3 S cm −1 at 30 °C) and provides a wide and stable electrochemical window (approximately 5.0 V). The Li/ZSPH9-LiPF 6 /Li quasi-solid-state cell demonstrates an impressive longevity of over 1800 h at a current density of 0.2 mA cm −2 . The high compatibility of the interface between electrode and ZSPH QSE and effective inhibition of Li dendrites growth create synergistic effects, which make it possible to realize high energy density and safe LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jin-Qi Xie,Jing Tian,Lingjie Mao,Humeizi Cao,Xinyi Duan,Lingsisi Li,Lang Shi,Yaqiang Ji,Xian-Zhu Fu
Printable, stretchable, and highly conductive metal conductors have emerged as potentially promising interconnects in the field of soft electronics. However, current techniques relying on geometric engineering have been criticized for complicated fabrication process and defective geometric structure. Here, we report a printed, straight, and omnidirectionally stretchable copper conductor, which is facilely fabricated on a flat substrate without requiring prestretching, assisted by a multifunctional gel medium layer. The PSS gel, composited by polydimethylsiloxane, Schiff base and fumed SiO 2 , offers a unique combination of stretchability, printability, and moldability. Additionally, this gel enables the reduction of silver ions directly on its surface by partially bonded crosslinker molecules. The fully exposed catalyst exhibits excellent activity in catalyzing electroless copper deposition reaction, on which high-quality copper coating is facilely achieved. The produced copper patterns exhibit high conductivity (4.93 × 10 7 S m −1 ) and excellent stretchability with fracture strains of ∼ 191 % and ∼ 135 % for the uni- and omni-directionally stretchable patterns respectively, which are superior to the majority of stretchable metals in published literature. The stretchable wrinkles derive form the gel medium layer molded by templates, realizing straight metal lines on flat substrate. This process combines the advantages of traditional in-plane and out-of-plane strategies, demonstrating great potential in practical application.
研究领域:
材料科学
·
柔性电子
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Rufei Chen,Wenyan Duan,Gong Wang,Bingshan Liu,Yantong Zhao,Shan Li
Wave-transmitting materials are a kind of multi-functional materials that protect the normal operation of communication and guidance systems of spacecraft in harsh environments. In this paper, we fabricate a broadband microwave transparent Si 3 N 4 -SiO 2 composite ceramic with excellent performance through digital light processing (DLP) 3D printing technology. The influences of sintering temperature on the weight increase rate, density, dimensional shrinkage, phase composition, microstructure, bending strength and dielectric properties of Si 3 N 4 -SiO 2 ceramic were all systematically studied. The strength of Si 3 N 4 -SiO 2 ceramic sintered at 1350 ℃ was 77 ± 5 MPa. The relative permittivity of the ceramic is within the range of less than 4, and the loss tangent can be below 0.003. The 3D printed Si 3 N 4 -SiO 2 ceramic material exhibited excellent wave-transparent performance.
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
危险品化学品经营许可证（带存储）