Journal of Coatings Technology and Research
·
2023
·Vol. 21
·期 2
·655-663
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IF 2.3
Wang Yutuo,Li Yintao,Zhang Zhengquan,Xiao Mengqing,Chen Changwen,Zhou Yuanlin,Wang Shanqiang
A composite coating with self-embrittlement was prepared using SiO 2 -modified 3-aminopropyltrimethoxysilane and a solution of random copolymer P(PMMA- co -PMAA- co -PTFEMA). The structures and properties of the composite emulsions were determined using Fourier transform infrared spectroscopy, thermogravimetry, X-ray diffractometry, and transmission electron microscopy. The results indicate that the self-embrittlement morphology of the coating can be controlled by adjusting the ratio of MMA/MAA in the random copolymer. Furthermore, the coating exhibits a good decontamination effect on simulated radioactive dust (doped with elemental K).
研究领域:
材料科学
·
核技术应用
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Bowei Shen,XueJun Yu,Farong Zhang,Wenxiu Jiang,Hui Yuan,Zhiquan Pan,Hong Zhou
A new method of the catalytic alcoholysis of Dioscorea zingiberensis C. H. Wright into diosgenin by magnetic solid acid in a Teflon-lined stainless-steel autoclave for the first time. The magnetic solid acid, Fe 3 O 4 @SiO 2 –SO 3 H, was prepared by the connecting the –SO 3 H groups on the surface of SiO 2 encapsulated Fe 3 O 4 microspheres . The synthesized catalysts were systematically analyzed by Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analyzer (TGA), X-ray diffraction (XRD), vibrating sample magnetometry (VSM), temperature programmed desorption of ammonia (NH 3 -TPD), scanning electron microscope (SEM), transmission electron microscope (TEM) and transmission electron microscope-mapping(TEM-mapping). To obtain the best conditions for the alcoholysis of Dioscorea zingiberensis C. H. Wright, single factor test was first utilized to determine the range of optimal conditions and optimized by response surface method . A three-level-three-factor Box-Behnken design was adopted to illustrate the effect of solid acid mass, solvent volume, reaction time and temperature on the yield of diosgenin. The optimum conditions obtained by response surface methodology were: 0.42 g Fe 3 O 4 @SiO 2 –SO 3 H, 4.38 mL solvent of ethanol, the reaction temperature at 100 °C and 6.09 h reaction time. At the optimal conditions, this method can reach the highest yield 2.64% from Dioscorea zingiberensis C. H. Wright. The yield of the new method was 21.66% higher than conventional sulfuric acid hydrolysis based on the analysis results of UV and HPLC. Importantly, the catalysts and solvents used in the alcoholysis process by the solid acid can be recovered, which is green and environmentally friendly, indicating that the catalytic alcoholysis with magnetic solid acid under hydrothermal conditions had a broad application prospect in diosgenin production.
研究领域:
植物化学
·
药物化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Fenqi Ji,Rongrong Jin,Chen Luo,Chunhui Deng,Yaoming Hu,Li Wang,Rongchang Wang,Jiabin Zhang,Guoxin Song
In this paper, a novel core–shell structure magnetic microsphere Fe 3 O 4 @SiO 2 -TPM@StVp(Fe 3 O 4 @SiO 2 -3-(trimethoxysilyl)propyl methacrylate@styrene and n -vinylpyrrolidone) was successfully synthesized and used as a magnetic solid-phase extraction adsorbent for extraction of aristolochic acid I (AAI) in traditional Chinese medicine soup. The prepared Fe 3 O 4 @SiO 2 -TPM@StVp was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and Fourier-transform infrared spectroscopy (FT-IR). The microspheres have various advantages of excellent hydrophilicity and π-electron system, which is very suitable for determining target analytes followed by high performance liquid chromatography (HPLC). The main factors, including the pH of samples, amount of adsorbent, adsorption time, elution solvent and desorption time, were optimized. Under optimal conditions, the proposed method showed a wide linear range of 0.4–10 µg/mL and a good correlation coefficient ( R 2 = 0.9918). The pretreatment procedure was achieved within 10 min. The recoveries of aristolochic acid I in real samples range from 80.9% to 89.6% with relative standard deviations less than 4.9%, highlighting the accuracy of this method.
研究领域:
分析化学
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中药学
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毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Jing Ding,Chengwei Zhou,Zuowang Wu,Chong Chen,Nengjie Feng,Lei Wang,Hui Wan,Guofeng Guan
Construction of an efficient and separable Bronsted acid catalyst to realize one-pot conversion from low-value oils to biodiesel has been a hot and difficult spot in recent years. Herein, a novel magnetically recyclable catalyst was fabricated by grafting the sponge-like structure of poly (ionic liquid) on the surface of support Fe 3 O 4 /SiO 2 . The grafting copolymerization of dual-acidic ionic liquid (sulfonated vinylimidazolium ionic liquid) on the Fe 3 O 4 /SiO 2 was beneficial to enhance the strong acidity of the magnetic carrier and also made dual-acidic ionic liquid own excellent separation characteristics. The characterization results of the prepared composite showed that a sponge-like structure of poly(ionic liquid) was wrapped on the outer surface of Fe 3 O 4 @SiO 2 , thereby providing more active sites to reactants. Meanwhile, the catalyst possessed high magnetization value (14.3 emu/g) that resulted in the simple and rapid separation from the reaction system through an external magnetic field. Benefiting from the synergy effect between dual-acidic poly(ionic liquids) and magnetic carrier, Fe 3 O 4 @SiO 2 @PIL exhibited good catalytic performance with the oleic acid conversion of 92.1 % and the methyl oleate yield of 92.1 %. Besides, the recycled catalyst showed no significant loss in the catalytic activity after repeated use for six times.
研究领域:
材料科学
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催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2018
·
IF 2.207
Qing Fu,Xiaolin Zhang,Peipei Yan,Shichao Wang,Xinzhi Wang,Yao Wang,Linjun Huang,Yanxin Wang,Haiyan Liu,Laurence A. Belfiore,Jianguo Tang
This paper presents strong fluorescence of spin-coated fluorescent solid organic dye films (SODF) enhanced by surface plasmonic resonance (SPR). In order to manifest the influence of SPR effect on enhancement of organic dye (OD) fluorescence, the organic dye embedded Ag@SiO2 fluorescent films were developed on the glass sheet substrate, in which Ag@SiO2 nanoparticles were embedded in the middle and organic dye was as upper layer. The morphology of the SODFs with and without Ag@SiO2 particles was studied by SEM and EDX, and the tests revealed that the Ag@SiO2 nanoparticles distributed evenly between glass sheet and OD layer. Optical properties were characterized by UV absorption and fluorescence spectroscopy; the lifetime of SODF was tested to discuss the mechanism of SPR enhancement of fluorescence. The results proved that the existence of Ag@SiO2 particles enhanced the fluorescence intensity for 7 times and thus proved the SPR effect for organic dye, especially when the organic dye is the solid films. Therefore, the most important is the creation that the SPR effect of Ag@SiO2 particles works very well under solid organic dye coverage.
研究领域:
材料科学
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光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Hongxin Luo,Xin Li,Nanqi Shi,Feng Guo,Han Yin,Zhike Li,Haiyan Li
In this work, self-reporting corrosion inhibition coatings with long-term corrosion protection was prepared by different process means. The two-dimensional (2D) materials ZrP-NH 2 and Tannin@SiO 2 (TA@SiO 2 ) microcapsules were introduced into the epoxy resin (EP) coatings, and the Layered EP coatings (TA@SiO 2 layer coatings and ZrP-NH 2 layer coatings) and the Mixed EP coatings were prepared by layered spraying and mix spraying, respectively. In the pre-corrosion stage, the excellent barrier performance of the ZrP-NH 2 layer coating hinders the diffusion of corrosive media. In the later stages of corrosion, the TA@SiO 2 microcapsules in the TA@SiO 2 layer coating releases TA, which forms a TA-Fe 3+ passivation film with the metal substrate and confers the coating with a blue-violet self-reporting function. Furthermore, the synergistic corrosion inhibition mechanism of TA@SiO 2 layer coatings was investigated by DFT theoretical calculations and experiment. Meanwhile, the Layered EP coatings provide the triple functions of excellent physical barrier action, corrosion inhibition and self-reporting under high temperature and high salt conditions.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Xianfei Zeng,Yang Zhou,Wenhui Ma,Shixing Wang,Keqiang Xie,Jijun Wu,Kuixian Wei
Di(2-picolyl)amine derivates functionalized inorganic/organic hybrid magnetic network was prepared for selective detection and removal of Zn (II). A significant visual color change from colorless to pink-red was observed under the irradiation of 365 nm UV lamp. The inorganic/organic hybrid Fe 3 O 4 @SiO 2 nanoparticles were characterized by TEM, XRD, VSM, FT-IR, and TGA techniques. The fluorescence photograph showed that di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 nanoparticles were sensitive and selective to Zn 2+ in acetonitrile solution. The di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 nanoparticles with high saturation magnetization can conveniently separate metal ions from aqueous solution. Fluorescence spectra showed that the intensity varied obviously with the concentration of Zn 2+ . The removal efficiency of Zn 2+ can reach as high as 97.1% and the saturated adsorption amount of Zn 2+ is 161.6 mg/g. Langmuir linear fitting can illustrate the well consistent with the adsorption results.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Changwei Tang,Changle Li,Zilong Yang,Jiawei Liu,Quan Bai
The biphasic method is commonly used to prepare SiO 2 @SiO 2 core-shell microspheres (CSSMs) with pores perpendicular to the surface of the SiO 2 core. However, this method often results in incomplete shell coverage during scale-up preparation, which severely hinders the commercial application of this method. In this paper, the formation mechanism of the silica shell layer during the preparation of CSSMs using the biphasic method was investigated. The degree of interface disturbance in the biphasic system was found to affect the type and size distribution of emulsion droplets containing TEOS. Mild disturbance led to small O/W emulsion droplets around 2 μm in size, while strong disturbance resulted in both small O/W emulsion droplets around 2 μm and larger W/O/W emulsion droplets larger than 5 μm in the aqueous phase. Due to their mass differences, the droplets exhibit distinct inertial motion in the reaction system, leading to different wetting behaviors on the SiO 2 core surface. Specifically, the larger 5 μm droplets can partially wet the SiO 2 core interface when the silicate oligomer density on the droplet surface is low and hydrophobicity is high, whereas the smaller 2 μm droplets only wet the SiO 2 core interface when the silicate oligomer density is high and hydrophilicity is strong. When both droplet sizes coexist in the aqueous phase and participate in interfacial wetting, the residues with varying silicate oligomer densities further hydrolyze and condense, leading to shell structures with varying integrity. By reducing the stirrer diameter and agitation speed to maintain weak interfacial disturbance and generate only approximately 2 μm emulsion droplets, this study successfully resolved the issue of incomplete shell coverage during scale-up, achieving a CSSMs yield of 50 g. Furthermore, CSSMs modified with C18 were employed as the stationary phase in reversed phase liquid chromatography (RPLC) for the fast separation of small molecules and peptides. The superior separation efficiency indicates that the biphasic method has the potential to be utilized in the large-scale production of CSSMs.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 31
·26280-26287
·
IF 3.289
Binbin Li,Heng Liu,Chuanbin Sun,Zeeshan Ahmad,Zhaohui Ren,Xiang Li,Gaorong Han
The investigation of nano-carriers with controllable and trackable drug release kinetics has attracted worldwide attention for new tumor theranostic strategies with catabatic side effects. Herein, a range of monodispersed core–shell structured photoluminescent SrTiO3:Yb3+,Er3+@mSiO2 nanoparticles were designed and synthesized. The surfactant cetyltrimethylammonium bromide (CTAB) was used to vary the microstructure of the mesoporous SiO2 shell. The specific surface area and pore volume increase proportionally with the content of CTAB. Consequently, the doxorubicin (DOX) loading capacity increases, and the drug release kinetics possesses a sustained behaviour. More importantly, the DOX release kinetics was found to correspond well to the evolution of the up-conversion luminescence (UCL) phenomenon. More rapid drug release induces more rapid photoluminescence enhancement, and vice versa. This study has therefore been anticipated to suggest another promising multifunctional drug delivery platform for advanced chemotherapies.
研究领域:
纳米医学
·
药物递送系统
·
生物材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 13
·8726-8734
·
IF 3.9
Mengnan Liang,Na Li,Hao Zhang,Ling Ma,Ke Wang
A novel magnetic organic polymer Fe3O4@SiO2@Tb–PDAN was designed and synthesized, which was used as an adsorbent for magnetic solid-phase extraction (MSPE) of 16 macrolides (MALs) in water and honey. The synthesized adsorbent was characterized using techniques including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Then several parameters of the extraction process were further optimized. Under the optimized conditions, an MSPE-LC-MS/MS method was established for extraction and determination of 16 MALs, which showed good linearity (r ≥ 0.999), low limits of detection (0.001–0.012 μg L−1 for water and 0.001–0.367 μg kg−1 for honey) and satisfactory recoveries (70.02–118.91%) with the relative standard deviations (RSDs) lower than 10.0%. This established method was then successfully applied to detect MALs in real samples, which suggested that Fe3O4@SiO2@Tb–PDAN was a potential magnetic adsorbent for efficient extraction and analysis of MALs.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2024
·
IF 5
Le Lyu,Guanqiu Hao,Yuhao Wang,Yingying Chen,Yongping Chen,Xiangdong Liu
This study presents a microfluidic approach for fabrication of compound phase change fibers (CPCFs) encapsulating nano-enhanced phase change material (PCM), RT25, for thermal regulation. The produced fibers are flexible and have strong compatibility and durable stability, with their size and the proportion of PCM can be precisely controlled by the microfluidic approach. Especially, a hydroxy surface modification method was used to uniformly disperse SiO 2 nanoparticles into the RT25, aiming to enhance the thermal regulation performance of the CPCFs. Thermal performance test was conducted and it indicated that, compared with the compound phase change fiber (CPCF) with pure RT25, the CPCF incorporated with 2 wt% SiO 2 nanoparticles presented a notable increase in thermal conductivity by 46.52 % and 45.51 % for solid-state and liquid-state enclosed PCM with a limited reduction in both melting and solidification enthalpies by 9.21 % and 10.1 %, respectively. Moreover, an experiment simulating the heat dissipation scenario of the electronic cabinet under intermittent running with short operation and long rest was conducted by using the CPCFs. It showed that adding SiO 2 nanoparticles can improve the heat absorption process (solid-to-liquid phase) via the CPCFs with a smaller temperature increase (i.e., the maximum temperature of simulated inner electronic device in the cabinet for the repeated intermittent running) and it is also able to make the CPCFs renew (liquid-to-solid phase) more quickly and ready for heat absorption process in the next cycle. These CPCFs offer a promising alternative for more efficient and sustainable thermal management of the electrical/electronic equipment.
研究领域:
材料科学
·
热能工程
·
纳米技术
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 406
·期 28
·7213-7220
·
IF 3.578
Gao Lin,Wang Jixiang,Li Xiuying,Yan Yongsheng,Li Chunxiang,Pan Jianming
In this study, we report here a general protocol for making core-shell magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs (MPS = 3-(methacryloxyl) propyl trimethoxysilane, MIPs = molecularly imprinted polymers, Fe 3 O 4 /SiO 2 -MPS as core, MIPs as shell) via a surface molecular imprinting technique for optical detection of trace λ -cyhalothrin. The fluorescent molecularly imprinted polymer shell was first prepared by copolymerization of acrylamide with a small quantity of allyl fluorescein in the presence of λ -cyhalothrin to form recognition sites without doping. The magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs exhibited paramagnetism, high fluorescence intensity, and highly selective recognition. Using fluorescence quenching as a detecting tool, Fe 3 O 4 /SiO 2 -MPS/MIPs were successfully applied to selectively and sensitively detect λ -cyhalothrin, and a linear relationship could be obtained covering a wide concentration range of 0–50 nM with a correlation coefficient of 0.9962 described by the Stern-Volmer equation. The experimental results of practical detection revealed that magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs as an attractive recognition element was satisfactory for determination of trace λ -cyhalothrin in honey samples. This study, therefore, demonstrated the potential of MIPs for detection of λ -cyhalothrin in food.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）