JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 47
·期 9
·5359-5369
·
IF 1.566
Yao ZiFeng,Zheng GanHong,Zhang ZhanJun,Dai ZhenXiang,Zhang LingYun,Ma YongQing
Mono-dispersed and uniform SrMoO 4 :0.1Eu nanoparticles have been synthesized using a thermal decomposition technique. The prepared SrMoO 4 :0.1Eu nanoparticles have narrower size distribution than the particles synthesized previously using other preparation techniques. In order to improve the photocatalytic performance of SrMoO 4 -based materials, the SrMoO 4 :0.1Eu nanoparticles were also diluted in an amorphous SiO 2 matrix with different concentrations of SrMoO 4 :0.1Eu nanoparticles. Although crystalline SiO 2 is an insulator and has no photocatalytic activity due to its intrinsic properties, the results suggested that the current SrMoO 4 :0.1Eu nanoparticles diluted in amorphous SiO 2 exhibited enhanced photocatalytic performance in the degradation process of methyl blue. Large absorption in the visible and ultraviolet light was observed by the UV–vis absorbance spectra. The smallest energy gap in these samples was found to be 2.0 eV. In particular, the photodegradation efficiency of methyl blue over SrMoO 4 -based samples was up to about 88% in 60 min when the quantitative ratio of SrMoO 4 :0.1Eu and SiO 2 was fixed to be 1:2, respectively. By synthesizing the undiluted and SiO 2 diluted SrMoO 4 :0.1Eu samples, this work provides an effective technique to improve the photocatalytic activity of SrMoO 4 -based materials, especially SrMoO 4 :0.1Eu nanoparticles.
研究领域:
材料科学
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纳米技术
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环境化学
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光催化
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无机合成
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Ruihao Jin,Zhixuan Qiu,Wen Cheng,Xinglong Jin
Aniline is recalcitrant pollutant and its efficient and cost-effective removal is greatly needed. According to the existing methods in the laboratory, Fe 3 O 4 @SiO 2 @BiO 1.8 ·0.04H 2 O/Ag 3 PO 4 (FSBAP) magnetic nanocomposites were prepared and the photocatalytic properties were also evaluated with aniline as model pollutant. The experimental data suggested that the nanocomposites FSBAP could effectively degrade organic pollutants under visible light. The degradation rate of 250 mL aniline solution (10 mg/L) with 1.20 g/L FSBAP catalyst was 88.06% under visible light for 150 min. FSBAP nanocomposites showed good reusability and recyclability after five runs. In addition, scavengers trapping experiments proved that photogenerated holes (h + ) played an important role in photocatalytic reaction. The possible mechanism was also proposed. The results revealed that FSBAP exhibited high reusability and stability in degrading aniline.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jianwen Ge,Li Liu,Yu Cui,Rui Li,Fandi Meng,Fuhui Wang
Whereas growing numbers of strong-absorption materials have been synthesized in recent years, it is also necessary to design broad-bandwidth, low-thickness, high-intensity absorbers. The ternary Fe 3 O 4 @SiO 2 @MnO 2 hybrids were fabricated via hydrothermal and hydrolysis processes, combined with typical core-shell structure characteristics and heterogeneous properties, further generating interfacial polarization behavior and enhancing anisotropy. Investigations of micromorphology manifested the hierarchical characteristic via the presence of inner mesoporous Fe 3 O 4 cores, outer SiO 2 layers (approximately 10 nm) and MnO 2 nanosheets as the surface of the hybrids. On the basis of rational design, the optimized multi-layers absorber exhibited excellent absorption performance with optimal reflection loss (RL min ) of −50.2 dB at 13.9 GHz, and the effective absorption band (EAB) is up to 5.1 GHz from 11.5 GHz to 16.6 GHz with the thickness of 2.6 mm. Due to the large surfaces, high porosity as well as the synergistic effect derived from the magnetic Fe 3 O 4 cores and dielectric SiO 2 @MnO 2 layers, this effective strategy may be endowed with high potential to design high-efficient absorbers.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Longfei Zhang,Yuqing Zhang,Jiahao Wei,Wei Liu
To improve the cleaning efficiency of the membranes for wastewater, perovskite LaFe x Co 1-x O 3-λ deposited SiO 2 catalytic membrane (PCM) with functionality of peroxymonosulfate (PMS) induced catalytic oxidation and membrane separation was prepared by employing LaFe x Co 1-x O 3-λ deposited SiO 2 as the functional layer on diatomite support. The perovskite LaFe x Co 1-x O 3-λ deposited SiO 2 functional layer was modified by doping Fe, which contributed to the generation of oxygen vacancies, resulting in the massive generation of singlet oxygen and sulfate radicals during the pollutant degradation processes. Besides, the heterogeneous catalyst was effectively immobilized by PCM, and the mass transfer was enhanced owing to the adequate curved channels and eddy diffusion, performing a preferable catalytic oxidation efficiency and permeability. The water yield and degrading efficiency for tetracycline hydrochloride aqueous solution (20 mg/L) were 1064.5 L/m 2 h and 99%, respectively. Simulated wastewater containing organic pollutant and oil was treated by PCM, demonstrating an attractive separation and catalytic performance. Furthermore, cycling and regeneration test indicated that the PCM exhibited favorable stability and regeneration abilities after 10 consecutive cycles. Therefore, PCM with capacities of separation and catalytic oxidation performed potential application in complex wastewater treatment.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Weizhou Li,Quanzhi Chen,Deli Shen,Ruixia Yang,Xiuhai Zhang
In order to decrease defects and improve protective performance, micro-arc oxidation (MAO) coating was modified by adding SiO 2 particles to form a composite coating on TA2 alloy via laser treatment. The microstructural morphology, phase structure, cohesive strength and corrosion resistance of the composite coatings were investigated and analyzed by using SEM, XRD , thermal cycle, and electrochemical testing, respectively. The results showed that SiO 2 particles were firstly adsorbed onto the MAO surface with the aid of ultrasonic treatment and then sealed micro-pores of the MAO coating after laser treatment. The composite coating mainly consisted of R-TiO 2 , A-TiO 2 and SiO 2 phases and exhibited a dense multilayer structure with a rich Si element in the outer layer. After subjecting the coatings to 300 thermal cycles, clacking or marked spalling zones could not be observed in the composite coating; nevertheless, an obvious destruction appeared in the single MAO coating without SiO 2 particles. The corrosion potential ( E corr ) and pitting potentials ( E pit ) of the composite coating were −0.303 V and 1.765 V compared to that of −0.682 V and 1.401 V for the single MAO coating. Additionally, the corrosion rate decreased to 1.40 × 10 −4 A·cm −2 with the highest resistance (76,788.67 Ω·cm 2 ) from2.19 × 10 −4 A·cm −2 , indicating a stronger corrosion resistance in the composite coating. The results of simulation from Comsol Multiphysics demonstrated that a laser power as 80 W was appropriate for melting SiO 2 particles into the MAO coating to form a dense and cohesive composite coating.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CORROSION
·
2022
·Vol. 78
·期 12
·1190-1202
·
IF 2.094
Xu Yangshuhan,Chen Feng,Wang Shufen,Li Minghua
In this work, ordinary epoxy coatings were modified by hydrophobic nanoSiO 2 and hydroxyl PDMS to construct ultrahydrophobic epoxy coatings for corrosion protection and self-cleaning of phosphatized Q235 carbon steel. Ordinary epoxy polymer coating was fabricated via polyaddition reaction between E44 (bisphenol A epoxy resin oligomer) and DDM (4,4-diaminodiphenyl methane). The microscopic morphologies of coatings showed that many SiO 2 nanoparticles were presented on the surface of ultrahydrophobic epoxy coating. Through static water contact angle measurement, the modified epoxy coating displayed ultrahydrophobicity with a water contact angle of approximately 150°. However, adding too much nanoSiO 2 caused cracks on the modified epoxy coating, which deteriorated the corrosion resistance of the coating. According to the corrosion test results, the modified coating added with 6.7 wt% hydrophobic nanoSiO 2 and chemically modified with hydroxyl PDMS showed the best corrosion protection performance, which was reflected by the high impedance of approximately 10 9 Ω·cm 2 after 50 d immersion in 3.5 wt% NaCl (aq.). Besides, the coating also presented good self-cleaning performance. The coating extracted from the slurry still remained clean without any contamination.
研究领域:
材料科学
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表面工程
✓ 已验证
DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
·
2022
·Vol. 38
·期 1
·87-98
·
IF 1.595
Huijuan Shi,Zhenzhen Chen,Yingping Qi,Hua Li
A novel paper multifunctional protective solution was prepared by mixing berberine modified trimethoprimed carboxymethyl cellulose (TMP-DCMC-BBR), KH-791 modified nano-SiO 2 (KH791-SiO 2 ) and hydroxypropyl starch phosphate (HPDSP), and the mechanical properties, optical properties, antibacterial properties, aging resistance, acid and alkali resistance of the paper coated with the protective solution were investigated. It is shown that the paper coated with the multifunctional protective liquid showed good mechanical properties, and has little influence on optical properties of the paper. At the same time, it had good antibacterial properties, aging resistance and acid and alkali corrosion resistance, and there is no obvious change in paper appearance, no decolorization and ink diffusion, which is in line with the principle of “repairing the old as the old and keeping the original appearance”. Moreover, the compound solution has certain reversibility and can absorb a certain degree of ultraviolet rays, so as to weaken the damage of ultraviolet rays to the paper. It is an ideal multifunctional protective liquid for paper and has broad application prospects in paper protection.
研究领域:
材料科学
·
文物保护
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 2
·025004
·
IF 1.62
Mengyuan Li,Zhiyang Zhao,Xianli Fang,Zefeng Zhang,Min Deng
CsxWO3-ZnO-SiO2 smart coatings were proposed to achieve multiple functions, such as thermal insulation, anti-dust, anti-fogging and blocking harmful ultraviolet light, etc. The transparent hydrophobic hybrid resins were prepared from methyltriethoxysilane (MTES) and SiO2 sol, which was used as the substrate of the composite coating. The CsxWO3 is served as the near-infrared (NIR) absorber, and the ZnO is functioned as the ultraviolet (UV) blocking agent. Coatings with different ratios of CsxWO3 and ZnO were successfully prepared by co-blending with nano-SiO2 resin. The morphology, microstructure, surface composition, hydrophobicity, thermal stability, anti-dust and optical property of the composite coatings were investigated comprehensively. The transmittance of C10Z10 (CsxWO3 10%, ZnO 10%, nano-SiO2 resin 80%) coating at 370 nm is 2.3%, and the value of Solar Energy Transmittance Selectivity (SETS) is 0.665, which exhibits excellent NIR shielding ability. Compared with nano-SiO2 resin coating, the thermal insulation temperature difference can reach 7.0 °C. The C10Z10 coating showed good durability in the twenty times anti-dust repeated tests and the efficiency could maintain 70.3% after the repeating tests. The coating showed excellent sustainability after a 45-day outdoor exposure experiment and a 240 h of artificial accelerated aging experiment. Thus, the proposed CsxWO3-ZnO-SiO2 coatings are promising for outdoor smart windows.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2023
·Vol. 46
·期 2
·1-10
·
IF 1.8
Liang Dong,Xiong Sang,Zhang Xiaomeng,Ye Yuanfeng,Cao Jingxin,Hu Xingxing,Song Yao,Wei Qianwen
WO 3 :Eu 3+ powder was prepared by microemulsion method with cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The prepared WO 3 :Eu 3+ samples were wrapped with SiO 2 by a coating method. The WO 3 :Eu 3+ @ SiO 2 nanocomposites with the core-shell structure were prepared by controlling tetraethyl orthosilicate (TEOS) content (1, 3, 5 and 7%) and water–alcohol ratio (1:3, 1:1.5, 1:1 and 2:1). The structure, morphology and luminescence properties of the prepared WO 3 :Eu 3+ @ SiO 2 samples were characterized by XRD, SEM, TEM and fluorescence spectra. The results show that the prepared WO 3 :Eu 3+ @SiO 2 nanocomposites are spherical and granular, and the average particle size is below 100 nm. Under the condition of different TEOS contents, the strongest characteristic peak is located at 554 nm in the green light band at the excitation wavelength of 328 nm. Among the different water–alcohol ratio conditions, the prepared WO 3 :Eu 3+ @SiO 2 nanocomposite has the strongest luminescence intensity at the water–alcohol ratio of 1:3, and the excitation wavelength is 328 nm. The excitation spectra measured at 612 nm have prominent characteristic peaks at 362, 394, 422, 465 and 499 nm, which correspond to the transition of 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , 7 F 0 → 5 D 2 and 7 F 0 → 5 D 1 , respectively.
研究领域:
材料科学
·
纳米技术
·
光学性质
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 25
·e202301101
·
IF 2.1
Jiali Zhai,Huan Jiang
Graphical A novel solid-state fluorescent ZnO@SiO 2 nanocapsules powder with a fluorescence quantum yield of 26.8 % has been fabricated and successfully applied to fast latent fingerprint imaging. As advanced fingerprint powders, fluorescent materials generally provide high sensitivity and improved contrast on the pigments or patterned surface, with high resolution. In this study, ZnO nanoparticles are used as fluorescent materials and are homogeneously embedded into SiO 2 matrix to prepare ZnO@SiO 2 nanocapsules. Compared with conventional methods, ZnO@SiO 2 nanocapsules are fabricated using the transparent ethanol solution of ZnO NPs and n-Octyltriethoxysilane without any surfactants. Interestingly, a large number of ZnO NPs can be homogeneously embedded in the silica matrix, reducing the aggregation-induced quenching effect. The maximum emission of the ZnO@SiO 2 nanocapsules powder is located at 530 nm under 325 nm irradiation, and the photoluminescence intensity and the sensitivity of latent fingerprints development depend on the quantity of ZnO NPs in the composites. The prepared fluorescent ZnO@SiO 2 nanocapsules show outstanding property applied as effective fluorescent eikonogens for the high-sensitivity visualization of latent fingerprints on different porous and non-porous substrates. It has been demonstrated that ZnO@SiO 2 nanocapsules compounds combine the admirable adhesion of silica powders to fingerprint residues with the excellent photoluminescence properties of ZnO to form a promising light-emitting material for fingerprint.
研究领域:
材料科学
·
法医学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Hao Yanjun,Zheng Xuecheng,Fan Wei,Chen Siqi,Ye Zhongbin,Tai Lei
In view of the extremely developed bedding of shale formations, which are dominated by micro-nano pores and fractures, traditional sealing agents make it difficult to produce a tight seal on shale formations due to their huge particle sizes. Combining the bridging effect of inorganic nanoparticles and the deformation properties of organic particles, this article synthesized a core-shell structure nano-blocking agent through emulsion polymerization, which was called P(MMA-St-BD)/KH570-SiO 2 . The structure of the synthesized nano-plugging agent was characterized utilizing Fourier transform infrared spectroscopy (FT-IR), particle size distribution, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Performance characterization was carried out through the effect of nano-blocking agents on emulsion stability, rheological properties, microporous filter membrane plugging experiments, and core pressure-bearing capacity tests. The findings demonstrate that P(MMA-St-BD)/KH570-SiO 2 ’s structure satisfies design specifications, and that the nano-plugging agent has outstanding thermal stability, homogeneous particle size distribution, and good dispersion. Its decomposition temperature also exceeds 400 °C. This study analyzed the plugging efficiency of nano-blocking agents from the temperature perspective, indicating that the nano-blocking agents seal shale formations tightly. Ultimately, through mechanism analysis, nanomaterials can squeeze and deform through the polymer shell and enter the shale micropores and micro-cracks for sealing, forming a high-strength sealing zone.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 12
·125503
·
IF 1.068
Jiaxi Liu,Gang He,Nan Lu,Jiangtao Li
Photo-absorption enhanced black TiO2–SiO2 microspheres were prepared by flame spraying synthesis. The phase composition, microstructure, infrared absorption, and emission property of the synthesized samples were investigated. Compared with the rutile TiO2 raw material, the visible light and near-infrared absorptivity of the flame sprayed TiO2 is significantly enhanced. The addition of SiO2 promotes the rutile-to-anatase phase transformation and appearance of Ti3+ species. The prepared sample with a composition of 40 at.% TiO2–60 at.% SiO2 exhibits the highest absorption of above 95% in 0.79–2.5 µm, and the highest emissivity of above 0.96 in 3–5 µm and 8–14 µm. The black TiO2–SiO2 microspheres with enhanced photo-absorption properties can be used as a promising optical-thermal conversion material.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）