OPTICAL MATERIALS
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2014
·
IF 2.075
Lina Liu,Surong Yue,Yongsheng Zhang,Ruifei Qin,Lishuang Liu,Dongmei Zhang,Ruirui Sun,Linfeng Chen
Core–shell structured YVO 4 :Eu 3+ @SiO 2 nanocomposite particles were synthesized using a one-pot reverse microemulsion method and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV absorption spectra , and photoluminescent spectra. The nanocomposite particles are well-dispersed and about 20 nm in average size. The synthesis method is of one-pot, simplifying the preparation of this kind of core–shell structured nanocomposites. The formation process of these nanocomposite particles is suggested and the photoluminescence properties of them are studied and compared with those of uncoated YVO 4 :Eu 3+ sample.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2016
·
IF 4.836
Xueqin Wang,Lvye Dou,Liu Yang,Jianyong Yu,Bin Ding
Constructing nanostructured catalyst-embedded ceramic fibrous membranes would facilitate the remediation or preliminary treatment of dyeing wastewater, however, most of such membranes are brittle with low deformation resistance, thus, restricting their widely applications. Herein, the flexible and hierarchical nanostructured MnO 2 -immobilized SiO 2 nanofibrous membranes (MnO 2 @SiO 2 NFM) were fabricated by combining the electrospinning technique with hydrothermal method. The morphologies of membranes could be regulated from nanowires and nanoflower to mace-like structure via varying concentration of reactants. The resultant MnO 2 @SiO 2 NFM could cooperate with hydrogen peroxide to form a Fenton-like reagent for the degradation of methylene blue (MB). The resultant membrane exhibited prominent catalytic performance towards MB, including high degradation degree of 95% within 40 min, fast degradation rate of 0.0865 min −1 , and excellent reusability in 5 cycles. Moreover, the membranes could be used in a wide pH range of 0 to 14 and the degradation degree reached 76% during dynamic filtration process with a flux of 490,000 L m −2 h −1 . The successful fabricating of such membrane with extraordinary catalytic performance would provide a platform for preparing high-performance catalysts for remediation of dyeing wastewater.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2015
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IF 3.942
Cen Tang,Yanxia Jin,Jiqing Lu,Xiaonian Li,Guanqun Xie,Mengfei Luo
A series of Mg catalysts supported on SiO 2 were prepared by an incipient wetness impregnation method and tested for gas phase dehydrochlorination of 1,1,2-trichloroethane. It was found that these catalysts were very active and selective for the reaction. The catalytic performance depended on the Mg loading rather than the Mg precursors as the catalysts using Mg(NO 3 ) 2 ·6H 2 O and MgCl 2 ·6H 2 O as the precursors showed the similar performance. A catalyst containing 10 wt.% of Mg showed the best performance with a steady state TCE conversion of 92% and cis -dichloroethene selectivity of 91%. Moreover, characterizations of the catalysts revealed the formation of Cl-containing Mg species on the surface during the reaction. The analyses of the compositions of the stable catalysts under working conditions indicated a Cl/Mg ratio of 1, suggesting that Mg(OH)Cl could be the active sites for the reaction.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ailing Bai,Hao Song,Gaoyin He,Qingsong Li,Chong Yang,Limei Tang,Yingmin Yu
Abtract Here, a simple and reproducible method for the preparation of a well-defined zirconia@silica core–shell nanostructure is described. We studied the morphology, size, and composition of prepared nanoparticles (NPs) by transmission electron microscopy , scanning electron microscopy, dynamic light scattering, Fourier transform infrared spectroscopy , X-ray diffraction, and energy-dispersive spectroscopy. ZrO 2 NPs were synthesized through a novel alcohol–water mixed system using ZrOCl 2 ·8H 2 O as the zirconium source under mild hydrothermal conditions (110–120 °C). These NPs were then used as the core for the deposition of a silica shell via a modified Stöber method, resulting in uniform core–shell ZrO 2 @SiO 2 composites with a tunable silica shell thickness and controllable core morphology. In addition, the effect of the agent polyvinylpyrrolidone (PVP) on the formation of the core–shell structure was investigated in detail. The results demonstrated the PVP played a critical role in stabilizing the NPs and enhancing the affinity between SiO 2 and ZrO 2 .
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
Analytical Methods
·
2017
·Vol. 9
·期 8
·1265-1272
·
IF 1.9
Caihong Li,Jian Li,Haowei Tang,Xiaodi Yang,Qiqi Fei,Chong Sun
In this study, a simple non-enzymatic hemoglobin (Hb) biosensor based on SiO2–Au nanoparticles (SiO2–Au NPs) was prepared and investigated. The structure and morphology of the SiO2–Au NPs were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy. Fourier transform infrared spectra (FTIR) and circular dichroism (CD) spectra were obtained to test the biocompatibility of the SiO2–Au NPs. The electrochemical properties were determined via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Under the optimized conditions, the linear regression equation between the peak currents and the concentration of Hb was i (μA) = −51.57269 + 83.14106c (mg mL−1) (R2 = 0.9979) with a detection limit of 204.46 ng mL−1. In addition, the electrochemical biosensor possessed good anti-interference performance. Due to the superior performance of SiO2–Au NPs, this method shows great potential applications for the direct sensing of Hb for the purpose of evaluating meat quality.
研究领域:
生物传感技术
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纳米材料科学
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医学检测
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Haishan Wu,Yipeng Chen,Weiwei Zhang,Malik Saddam Khan,Yuwu Chi
Recently emerging perovskite quantum dots (PQDs) with extremely high (near 100%) fluorescence quantum yield (FQY) may have attractive applications in sensing and bioimaging. However, practical applications of PQDs as signal probes in aqueous media, especially in long-time bioimaging, have been greatly limited by the well-known poor stability of PQDs in water. In this work, a single intact CsPbBr3 PQD nanocrystal was well encapsulated with a SiO2 shell using a simple and highly successful coating strategy. In the synthesis, polyvinyl pyrrolidone (PVP) instead of classic oleic acid (OA) and oleylamine (OAm) was used as the ligand and surfactant to increase the affinity between PQDs and SiO2, significantly increasing the coating efficiency of PQD single nanocrystals. Meanwhile, easily hydrolyzed trimethoxysilane (TMOS) was adopted as the silicon source to shorten the hydrolysis time of silane, which obviously decreased the degradation of PQDs during SiO2 coating. The obtained PVP-PQD@SiO2 core–shell nanoparticles were uniform in size, maintained a high FQY of PQDs, and exhibited excellent air and ultraviolet (UV) stability. Moreover, PVP-PQD@SiO2 core–shell nanoparticles could be easily modified with trimethoxyoctadecylsilane (C18) and lecithin, in turn, to assemble a lipid layer on their surfaces, yielding very well water-dispersed, long-term water-stable, highly fluorescent, and low-cytotoxic PVP-PQD@SiO2@C18-PC nanoprobes. It was demonstrated that these good properties of the obtained PVP-PQD@SiO2@C18-PC nanoprobes enabled their successful application in cell imaging.
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 13
·1287-1292
·
IF 0.975
Feng Wang,Jie Li,Long Xu,Feng Jiang,Jianfeng Zhang
In this work, the study of synthesis and denitrogenation of magnetic polymeric ionic liquids (PILs) for N-compounds in simulated oils and diesel are reported. Three functionalised magnetic particles, Fe 3 O 4 @SiO 2 @PILs with side alkyl chain of C2, C4 and C6, respectively, were prepared by grafting PILs on the surface of silica-coated Fe 3 O 4 . Fourier transform infrared spectra, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy were carried out to characterise the structure of Fe 3 O 4 @SiO 2 @PILs. It has shown that Fe 3 O 4 @SiO 2 @ PILs possess precious merits for sorbents, such as regular morphology, good stability and magnetic properties. Denitrogenation experiments of simulated oils demonstrate that Fe 3 O 4 @SiO 2 @ PILs show better denitrogenation efficiency of basic N-compounds than neutral N-compounds. The effects of temperature, reaction times, ratio of reagent to oil on denitrogenation for simulated oils were explored, and 92.1% denitrogenation efficiency was obtained to remove quinoline from simulated oils. Denitrogenation of Fe 3 O 4 @SiO 2 @PILs in diesel leads to 84.3% denitrogenation efficiency, and it can remain 82.5% denitrogenation efficiency after five times of recycles. Compared with other similar sorbents, Fe 3 O 4 @SiO 2 @PILs show competitive performances to eliminate organic N-compounds. It is hopeful that Fe 3 O 4 @SiO 2 @PILs can be promising sorbents for purification of liquid fuel by adsorptive denitrogenation.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 47
·41572-41579
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IF 3.289
Wenjing Song,Xiuna Liu,Shaoyang Jiang,Zhou Chen,Weizheng Weng,I. Rodríguez-Ramos,Xiaodong Yi,Weiping Fang
A series of catalysts comprising well-distributed Pd nanoparticles incorporated on silylated SiO2 were fabricated by the wet impregnation method and investigated in the selective hydrogenation of paracetamol to 4-acetamidocyclohexanone. The catalysts calcined at different temperatures were characterized by TG, FT-IR, N2 physisorption, TPR and XPS. The results showed that organic modification led to a catalyst surface composed of stable Si–(CH3)3 species even after calcination at 300 °C. Also, changes occurred in the size and electronic properties of the Pd particles through the different amounts of grafted groups on the SiO2 support. The mode of adsorption of the paracetamol molecule was influenced by the quite bulky organic groups on the support, resulting in a significant improvement in selectivity towards 4-acetamidocyclohexanone and preventing full hydrogenation to some extent. The best result was obtained on the silylated Pd catalyst calcined at 500 °C, with 64.9% selectivity to keto at the paracetamol conversion of 60.5%, while the non-silylated SiO2 supported Pd catalyst gave 4-acetamidocyclohexanone selectivity of 29.1% at 53.8% conversion.
研究领域:
催化化学
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有机合成
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2013
·Vol. 2
·期 11
·1990-1994
·
IF 0
Yuxia Luo,Jianfei Zhang,Aihua Sun,Chengyi Chu,Shi Zhou,Jianjun Guo,Tao Chen,Gaojie Xu
A shell size adjustable core–shell nano building block of SiO2@TiO2 using high refractive index materials of TiO2 as shell to coat SiO2 colloidal NPs by one step approach was prepared. Corresponding colloidal suspension of SiO2@TiO2 photonic crystals in propylene carbonate showed a highly adjustable structure color change with the high-refractive index upon applying of electric fields.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
JOURNAL OF POLYMER ENGINEERING
·
2019
·Vol. 39
·期 6
·556-564
·
IF 1.072
Wenxin Han,Jianjun Lu,Jingyi Ren,Dandan Lian,Junde Xing
Polyphenylene sulfide (PPS) is easily oxidized at high temperature, which greatly limits its applications. In this study, a nano-SiO 2 compound antioxidant (SiO 2 -g-AO) was prepared and incorporated into PPS by melt compounding to obtain PPS/SiO 2 -g-AO composites. SiO 2 -g-AO was prepared by reacting 3-(3,5-di-tert-butyl-4-hydroxyphenyl) (antioxidant AO) with an aminosilane coupling agent (KH792). Fourier transform infrared (FTIR) spectroscopy, energy dispersive spectroscopy (EDS) and thermogravimetric analysis (TGA) confirmed that the antioxidant AO was successfully immobilized on the surface of SiO 2 and the thermal stability was improved. Scanning electron microscopy (SEM) images showed that SiO 2 -g-AO was uniformly dispersed in PPS. It has been found that the crystallinity and mechanical properties of PPS composites improved, and the dynamic oxidation induction temperature (OIT) increased in the range of 16.7°C–21.1°C. A synergistic anti-oxidation model of nanoparticles and antioxidants, namely a multi-stage antioxidant system, was established by comprehensive analysis of experimental results. The synergistic anti-oxidation model provides a new idea for the antioxidant modification of polymer composites.
研究领域:
材料科学
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高分子科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 17
·1968-1976
·
IF 2.073
Shulei Wang,Lingyi Zhang,Ruili Xiao,Haihong Chen,Zhanying Chu,Weibing Zhang,Fan Liu
The structural regularity, atomically precise design, high surface area and adsorption affinity make covalent-organic frameworks (COFs) attractive as novel stationary phases in chromatography. In this paper, an in situ growth strategy was developed to synthesize a COF–silica composite (SiO2@COF5 microspheres) by modifying COF5 onto silica particles (5 μm) as the stationary phase for HPLC separation. The COF5 shell was constructed from benzene-1,4-diboric acid and 2,3,6,7,10,11-hexahydroxytriphenylene. The in situ growth of the COF5 shell not only on the particle surface but also inside the pore of the SiO2 particles overcomes the shortcomings of the irregular morphology of the COF and high back pressure from the sub-micrometer size of the COF, facilitating its application in HPLC. The enthalpy change and entropy change of analytes (alkyl benzenes and polycyclic aromatic hydrocarbons) during the separation with SiO2@COF5 as the stationary phase were first measured by varying the column temperature to investigate the retention mechanism. The enthalpy change and entropy change were found different from commercial C18 columns, suggesting the contribution of the three-dimensional structure of SiO2@COF5 microspheres. The SiO2@COF5 packed column (150 mm × 2.1 mm i.d.) showed excellent selectivity for alkyl benzenes, polycyclic aromatic hydrocarbons, anilines, acetophenones, benzaldehydes and isomers of hydroxyacetophenone. The SiO2@COF5 packed column also showed good repeatability with relative standard deviations of retention time and peak height below 5%.
研究领域:
分析化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Hu Yuanxia,Ma Jinghong,Gong Jinghua
The hydrophobic random copolymer P(HEMA-MMA-SMA) which contained 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA) and stearyl methacrylate (SMA) chains was successfully synthesized via radical polymerization. The composites membranes of poly (vinylidene fluoride) (PVDF) and P(HEMA-MMA-SMA) blends and PVDF/P(HEMA-MMA-SMA)/SiO 2 were prepared by electrospinning. Scanning Electron Microscopy (SEM) and Water Contact Angle (WCA) revealed that morphology and hydrophobic properties of the membrane surface. With the condition of 12 wt% SiO 2 , the maximum WCA (154°) of the electrospun composite film can be obtained. Superhydrophobic materials have been widely used in the fields, such as oil-water separation and self-cleaning. Keywords Methacrylate Poly(vinylidene fluoride) SiO 2 Random copolymer Blends Superhydrophobic Electrospinning Membranes
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
危险品化学品经营许可证（带存储）