POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 6
·1804-1814
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IF 2.137
Guoxing Yu,Yinfeng Liu,Juan Li
Urea formaldehyde microsphere (UFM) was prepared and used with organic montmorillonite (OMMT) to modify the flame retardant efficiency of ethylene vinyl acetate copolymer (EVA)/intumescent flame retardant (IFR) composites. The results show that single IFR may modify the flame retardancy of EVA, but its efficiency is not good enough. The EVA composite containing 21 wt% IFR is just classified the UL_94 V2 and has a limiting oxygen index (LOI) 24.7 vol%. Combining UFM with IFR does not improve the flame retardancy of EVA/IFR composites, and blending OMMT with IFR only improves its LOI. Adding 2 wt% UFM, 2 wt% OMMT, and 17 wt% IFR into EVA, it obtains the UL_94 V0 without melt dripping and a LOI 29.0 vol%. Also, the peak heat release rate and total heat release decrease a lot. Good synergistic effects among IFR, UFM, and OMMT improve the char residues and modify the char micromorphology of EVA composites, which provide better protect for the underlying resin.
研究领域:
材料科学
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阻燃材料
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xiaolan Hu,Li Long,Tengjing Gong,Jiaqi Zhang,Jinpeng Yan,Yingwen Xue
In order to increase the adsorption properties of sodium alginate gel beads, a series of SA@PF-beads (sodium alginate-based beads with different amount of pore-forming agent) were prepared with calcium carbonate as the pore forming agent. The experimental results showed that the adsorption capacity of Cu(Ⅱ) increased by at least two times (from 13.69 mg/g to 33.88 mg/g, treated with SA@PF-0 and SA@PF-2.0, respectively) with proper amount of calcium carbonate added, which is economical and effective. In the experiment, SEM was used to measure the morphology of gel beads with different amount of pore-forming agent. FTIR and XPS were used to analyze the variation of functional groups and bond energies in the adsorption process. Adsorption isotherms and kinetics were conducted and showed that the adsorption process was consistent with Langmuir model and Elovich kinetic model. The maximum Langmuir adsorption 229.746 mg/g. The effects of pH, temperature and solid-liquid ratio on adsorption capacity were also investigated. In brief, calcium carbonate is an efficient and convenient pore-forming agent, which can be used to improve the adsorption properties of alginate gel materials.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 37
·20852-20861
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IF 2.936
Jian-gen Xu,Zhengsong Qiu,Xin Zhao,Tingbo Mou,Hanyi Zhong,Weian Huang
Interest in using nanomaterials to improve shale stability during drilling operations has been increasing. Herein, a polymer microsphere emulsion (PME) as a high-performance shale stabilizer for water-based drilling fluids (WDFs) was prepared via emulsion polymerization. The particle sizes in PME in aqueous solution ranged from 90 to 320 nm. PME was found to exhibit excellent salt tolerance and temperature resistance. The plugging performance of PME was tested through pressure transmission tests. The results indicated that the polymer microspheres in PME could effectively plug shale pores and reduce shale permeability. In addition, rolling recovery tests were used to evaluate the shale hydration inhibition performance of PME. It was found that PME showed great performance for decreasing shale hydration potential. These factors make PME a promising shale stabilizer for WDFs used to drill shale formations.
研究领域:
材料科学
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石油工程
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Yi Chen,Guangsheng Zeng,Wenyong Liu
Shear thickening of suspensions was generally researched as a macro-perspective, the neglect of microstructure and micro-interactions may deviate the truth. Here, four suspensions were prepared by matching SiO 2 microspheres , SiO 2 -g-PMMA microspheres with oligomeric fluids PEG , PPG, respectively, the rheological behavior of them under the controlled temperature was investigated to figure out the influence of grafted chains on shear thickening. For all suspensions, the reversible shear thickening with significant temperature dependency was observed, the critical shear rate ( γ ˙ ) decreases rapidly and reaches to a balance with the decreased temperature. Under the same media viscosity, the γ ˙ of SiO 2 /PEG suspensions is higher than that of other suspensions at the lower temperature due to the stronger hydrogen bond interaction between the hydroxyl of microsphere and media. Comparing PEG, using low polar PPG as media raises the γ ˙ of SiO 2 suspensions and decreases the γ ˙ of SiO 2 -g-PMMA suspensions by reason of the changed interaction between microsphere and media, which is also affected by temperature. Moreover, the critical shear stress ( τ c ) of SiO 2 /PEG suspensions is higher than that of other suspensions in all test temperature region, revealing that the grafted chains weaken the jamming effect. Two models were used to predict τ c , the Wagner’s hard-sphere model predicts the SiO 2 /PEG suspensions well, Kaldasch’s model based on polymer stabilized colloidal system could fit the SiO 2 -PMMA/PEG suspensions better.
研究领域:
材料科学
·
流变学
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高影响因子
Advanced Energy Materials
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2018
·Vol. 9
·期 1
·1803035
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IF 21.875
Peng Ge,Sijie Li,Laiqiang Xu,Kangyu Zou,Xu Gao,Xiaoyu Cao,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
As a result of its high-energy density, metal–selenides have demanded attention as a potential energy-storage material. But they suffer from volume expansion, dissolved poly-selenides and sluggish kinetics. Herein, utilizing' thermal selenization via the Kirkendall effect, microspheres of NiSe 2 confined by carbon are successfully obtained from the self-assembly of Ni-precursor/PPy. The derived hierarchical hollow architecture increases the active defects for sodium storage, while the existing double N-doped carbon layers significantly alleviate the volume swelling. As a result, it shows ultrafast rate capability, delivering a stable capacity of 374 mAh g −1 , even after 3000 loops at 10.0 A g −1 . These remarkable results may be ascribed to the Ni O C bonds on the interface of NiSe 2 and the carbon film, which leads to the faster transfer of ions, the effective trapping of poly-selenide, and the highly reversible conversion reaction. The kinetic analysis of cyclic voltammetry (CV) demonstrates that the electrochemical process is mainly dominated by pseudocapacitive behaviors. Supported by the results of electrochemical impedance spectroscopy (EIS), it is confirmed that the solid–electrolyte interface films are reversibly formed/decomposed during cycling. Given this, this elaborate work might open up a potential avenue for the rational design of metal-sulfur/selenide anodes for advanced battery systems.
研究领域:
材料科学
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电化学
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高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Jinxing Chen,Shan Lei,Yunyun Xie,Mozhen Wang,Jun Yang,Xuewu Ge
The preparation of efficient and practical biomacromolecules imprinted polymer materials is still a challenging task because of the spatial hindrance caused by the large size of template and target molecules in the imprinting and recognition process. Herein, we provided a novel pathway to coat a NIR-light responsive lysozyme-imprinted polydopamine (PDA) layer on a fibrous SiO2 (F-SiO2) microsphere grown up from a magnetic Fe3O4 core nanoparticle. The magnetic core–shell structured lysozyme-imprinted Fe3O4@F-SiO2@PDA microspheres (MIP-lysozyme) can be easily separated by a magnet and have a high saturation adsorption capacity of lysozyme of 700 mg/g within 30 min because of the high surface area of 570 m2/g and the mesopore size of 12 nm of the Fe3O4@F-SiO2 support. The MIP-lysozyme microspheres also show an excellent selective adsorption of lysozyme (IF > 4). The binding thermodynamic parameters studied by ITC proves that the lysozyme should be restricted by the well-defined 3D structure of MIP-lysozyme microspheres. The MIP-lysozyme can extract lysozyme efficiently from real egg white. Owing to the efficient NIR light photothermal effect of PDA layer, the MIP-lysozyme microspheres show the controlled release property triggered by NIR laser. The released lysozyme molecules still maintain good bioactivity, which can efficiently decompose E. coli. Therefore, this work provides a novel strategy to build practical NIR-light-responsive MIPs for the extraction and application of biomacromolecules.
研究领域:
生物材料
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纳米技术
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分子识别
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PubMed
高影响因子
MATERIALS & DESIGN
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2016
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IF 3.997
Yawen Wang,Zunli Mo,Ping Zhang,Chun Zhang,Lijuan Han,Ruibin Guo,Hao Gou,Xiaojiao Wei,Rere Hu
A surfactant-assisted hydrothermal route was developed for the synthesis of three-dimensional (3D) flower-like TiO 2 microsphere decorated graphene composite (FT/GN) based on the hydrothermal reduction of graphene oxide and formation of TiO 2 microsphere in the presence of poly(vinyl pyrrolidone) (PVP). By several characterization methods such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, we demonstrated that uniform flower-like TiO 2 (FT) microsphere with average diameter of 1.4 μm have successfully anchored on the surface of graphene sheets . Effects of PVP and reaction temperature on the microstructure of the composite were investigated. Benefits from the combined graphene with FT microsphere were that the FT/GN composite exhibited higher adsorption capacity and photocatalytic activity for the removal of rhodamin B (RhB) than blank FT microsphere and P25. Especially, the removal rate of RhB using FT/8GN composite under UV light irradiation reached 99.2% in 80 min, with corresponding TOC removal efficiency of 66.49%. Moreover, the recycled photoactivity tests showed that the prepared composite were stable enough and maintained high removal efficiency for RhB even after four cycles. It is expected that the present synthetic strategy may provide a new strategy for the fabrication of various GN-based hybrids with multi-dimensional structure.
研究领域:
环境科学
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材料科学
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高影响因子
Arabian Journal of Geosciences
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2020
·Vol. 13
·期 2
·1-13
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IF 1.327
Zou Jirui,Yue Xiangan,Dong Jie,Gu Jun,Fu Joseph Yuchun,Wang Liqi,Mou Yufan
In order to enhance the low recovery efficiency in low-permeability and heterogeneous reservoirs resulted by water channeling during water flooding process, a series of flooding experiments using in situ polymerization microsphere (ISPM) with surfactant were conducted to achieve deep profile control in high conductivity water channels. Dynamic pressure measurement showed that ISPM demonstrated good injectability and profile control effect in low-permeability core of 20.22 mD, as the plugging rate was as high as 78.99%. At the same time, the electron microscopy results showed that the ISPM could migrate deeper into the core to form microsphere clusters to block the high conductivity channels. The core flooding experiments showed that the profile control effect of the composite slug consisted of surfactant and ISPM was much better than that of just ISPM alone. The front part of the slug consisting of BA with strong emulsifying capability and ultra-low interfacial tension can better exert the profile control effect of the ISPM and expand the sweep volume of the subsequent displacing agent better than surfactant TS with ultra-low interfacial tension. As a subsequent oil displacing agent after ISPM + BA profile control, surfactant BA with strong emulsifying capability and ultra-low interfacial tension, compared with AES and TS, achieved higher recovery efficiency. In low-permeability and heterogeneous reservoirs, ultra-low interfacial tension is screening crucial characteristic of surfactant, but emulsification capacity also plays a very important role. Combination of surfactant BA and ISPM could fully utilize the profile control effect of ISPM and the oil stripping effect of surfactant; the stage recovery efficiency was as high as 22.52%.
研究领域:
石油工程
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化学工程
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2013
·Vol. 405
·期 21
·6783-6789
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IF 3.659
Chen Rui,Li Heng,Zhang Han,Zhang Suxia,Shi Weimin,Shen Jianzhong,Wang Zhanhui
The fluorescent microsphere has been increasingly used as detecting label in immunoassay because of its stable configuration, high fluorescence intensity, and photostability. In this paper, we developed a novel lateral flow fluorescent microsphere immunoassay (FMIA) for the determination of sulfamethazine (SMZ) in milk in a quantitative manner with high sensitivity, selectivity, and rapidity. A monoclonal antibody to SMZ was covalently conjugated with the carboxylate-modified fluorescent microsphere, which is polystyrene with a diameter of 200 nm. Quantitative detection of SMZ in milk was accomplished by recording the fluorescence intensity of microspheres captured on the test line after the milk samples were diluted five times. Under optimal conditions, the FMIA displays a rapid response for SMZ with a limit of detection of as low as 0.025 ng mL −1 in buffer and 0.11 μg L −1 in milk samples. The FMIA was then successfully applied on spiked milk samples and the recoveries ranged from 101.1 to 113.6 % in the inter-batch assay with coefficient of variations of 6.0 to 14.3 %. We demonstrate here that the fluorescent microsphere-based lateral flow immunoassay (LFIA) is capable of rapid, sensitive, and quantitative detection of SMZ in milk.
Schematic illustration of the strategy for sulfamethazine detection using a lateral flow fluorescent microsphere immunoassay
研究领域:
分析化学
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食品安全
·
免疫分析技术
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2026
·
IF 4.8
Ziyi Wang,Xiu Wang,Ziqiang Li,Yikun Li,Muhammad Shan,Qianjin Li,Jianlin Li
A 3D SPM@GO@AuNPs substrate was built for cefalexin SERS detection. • GO enriches cefalexin and anchors AuNPs for hotspot generation. • Cefalexin was quantified from its 1189 cm-1 Raman band in 10 min. • The assay gave 0.01–10 μg/mL linearity and a 0.41 μg/mL LOD. • Cephalosporin analogues were distinguished by SERS fingerprints. Cefalexin residues in aquatic environments require detection methods that are fast, label-free, and spectroscopically reliable. Surface-enhanced Raman spectroscopy (SERS) can provide molecular fingerprints, but its analytical performance depends on analyte adsorption and the spatial consistency of the enhanced response. Here, a three-dimensional silica photonic microsphere (SPM) substrate was modified with graphene oxide (GO) and gold nanoparticles (AuNPs) to form an SPM@GO@AuNPs substrate for cefalexin fingerprinting in water. GO served as an AuNP-anchoring layer and as an adsorption interface that enriched cefalexin near SERS-active AuNP junctions, whereas the monodisperse SPM provided a curved, readily handled three-dimensional support. Cefalexin bands at 768, 833, 996, 1022, and 1189 cm −1 were resolved, with the 1189 cm −1 band used for quantification. Under optimized conditions, the method exhibited a linear range of 0.01–10 μg/mL, a limit of detection of 0.41 μg/mL, and a 10 min binding step. Cefalexin was distinguished from four cephalosporin analogues using the full spectral fingerprint rather than a single band. Spiked tap-water analysis gave mean recoveries of 86.99–96.83%, supporting the feasibility of direct aqueous screening. The method is best suited to rapid fingerprint-based screening of cefalexin in relatively simple water matrices. Download: Download high-res image (144KB) Download: Download full-size image
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Journal of Water Process Engineering
·
2023
·
IF 7
Junhui Yi,Runkun Xie,Ruilong Liu,Minghao Li,Haoxian Zeng,Qingqing Chen,Linxuan Cai,Ning Li,Changlin Yu,Zhenghui Liu,Dehao Li
The problem of environmental pollution caused by the frequent use of antibiotics has attracted extensive attention. The heterojunction composed of various bismuth oxyiodide (such as BiOI, Bi 4 O 5 I 2 , Bi 5 O 7 I, etc.) were widely used in the treatment of antibiotic wastewater. Herein, a hollow BiOI/Bi 5 O 7 I hierarchical microsphere was constructed in-situ by annealing BiOI precursors synthesized by the solvothermal method. The phase transition temperature for the formation of heterojunctions has been investigated in detail. The obtained products were characterized by various technologies including transmission electron microscope (TEM), X-ray photon-electron spectroscopy (XPS), and so on. Experimental results suggested that 390-BiOI/Bi 5 O 7 I microsphere with hollow structure exhibits the optimal performance and maximum photocurrent response under visible light irradiation. The efficiency for degradation of tetracycline hydrochloride (TH) was up to 83 % in 100 min. The value still maintained at 95 % after the catalyst has been reused for four times. The capture experiment indicates that produced ·O 2 − played the most important role. But formed h + and ·OH played a secondary role. The degradation intermediates were analyzed by Liquid Chromatography-Mass Spectrometry (LC-MS). Accordingly, the possible degradation pathways are proposed. An S-scheme based heterostructure photocatalytic mechanism is proposed aiming to explain the enhanced catalytic performance. The BiOI/Bi 5 O 7 I heterojunction with exceptional activity and stability is bound to expand applications in the field of water treatment .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhihao Feng,Xiaoyi Li,Changxiang Fang,Junying Li,Rongfei Wang,Weihua Hu
Oblique-incidence reflectivity difference (OIRD) is a newly established method to monitor various surface processes and shows great prospect for real-time and label-free immunoassay , yet its sensitivity needs essential improvement to meet the requirement of practical applications. In this work, a label-free OIRD immunoassay biochip was developed with improved sensitivity by using standard glass slide coated with polystyrene (PS) microsphere monolayer as the substrate. The immunoassay sensitivity of this biochip was found to be greatly improved compared with the conventional biochip built on glass slide. Further on-chip ELISA and optical calculation suggests that the improvement is not only associated with high capture efficiency of this biochip towards its target, but is also benefited from the porous PS monolayer enhanced intrinsic OIRD sensitivity via optical interference enhancement and effective dielectric constant effect. This work may provide valuable insight into the development of high performance label-free OIRD bio-detection devices.
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高影响因子
危险品化学品经营许可证（带存储）