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A new method of spore separation: preparation of antibiotic modified nanoparticles and its application in spore-vegetative cell mixed system 认领 引用
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作者 Mengya Li Shijie Liu +6 位作者 Dong Liang Shiliang Guo Miaoyun Li Yaodi Zhu Lijun Zhao Gaiming Zhao Yangyang Ma 《Food Science and Human Wellness》 SCIE CAS CSCD 2025年第12期5066-5078,共13页
Bacterial spores commonly co-exist with vegetative cells,presenting challenges in spore separation and detection.The separation of spores is a crucial process for laboratory research and the detection of spore mechani... Bacterial spores commonly co-exist with vegetative cells,presenting challenges in spore separation and detection.The separation of spores is a crucial process for laboratory research and the detection of spore mechanisms.This study introduced a novel method that leverages the high binding affinity of vancomycin(Van)and ampicillin sodium(Amp)to vegetative cells,integrated with magnetic separation technology,to selectively collect spores from complex environments by eliminating vegetative cells.First,Van/Amp-modified magnetic Fe3O4 nanoparticles(Fe3O4 NPs)were synthesized and characterized.Subsequently,these NPs bound vegetative cells,forming magnetic conjugates that could be efficiently removed using a magnetic field.Concurrently,spores were collected with an efficiency exceeding 95%,completing the entire process within 30 min and achieving a spore separation efficiency of up to 105 CFU/mL.This method was successfully applied to actual samples,including tap water and milk.The state of the collected spores was confirmed using Raman spectroscopy and microscopic techniques,verifying that their characteristics matched those of typical spores.The proposed novel method for rapid spore separation,leveraging the"remove bacterial effect'facilitated by Van/Amp-Fe3O4 NPs,showed outstanding spore collection capabilities while preserving the excellent physiological state of spores. 展开更多
关键词 Spore Separation method Vegetative cells Antibiotic Fe3O4nanoparticles
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Synthesis and Characterization of Fe3O4 Nanoparticles by Sol-Gel Method Using Water as a Solvent 认领 引用
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作者 Ahmad Mustafa Usman Ali +4 位作者 Mukarama   Ali Iqbal Maria Qayyum Inam Ul Haq Fakhar Islam 《Advances in Nanoparticles》 CAS 2025年第1期1-11,共11页
Ferromagnetic Fe3O4 nanoparticles were synthesized using water as the solvent through the sol-gel method, which was selected for its cost-effectiveness, simplicity, and eco-friendly nature. The synthesized nanoparticl... Ferromagnetic Fe3O4 nanoparticles were synthesized using water as the solvent through the sol-gel method, which was selected for its cost-effectiveness, simplicity, and eco-friendly nature. The synthesized nanoparticles were characterized using a variety of techniques, including Fourier Transform Infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), and Vibrating Sample Magnetometer (VSM). These characterizations confirmed the successful formation of Fe3O4 nanoparticles. The FTIR spectra identified characteristic peaks corresponding to the functional groups present, and XRD analysis, using Scherer’s equation, determined an average crystalline size of 1.2 nm for the Fe3O4 nanoparticles. TGA results demonstrated the thermal stability of the nanoparticles, SEM imaging revealed distinct honeycomb-like structures for the nanoparticles synthesized with water as the solvent, while the VSM analysis was used to determine the magnetic behavior of the nanoparticles. 展开更多
关键词 Fe3O4 Nanoparticles Sol-Gel Synthesis Honeycomb Structures FTIR XRD SEM TGA VSM
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N-doped porous carbon hollow microspheres encapsulated with iron-based nanocomposites as advanced bifunctional catalysts for rechargeable Zn-air battery 认领 引用 被引量：9
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作者 Ran Hao Jin-Tao Ren +3 位作者 Xian-Wei Lv Wei Li Yu-Ping Liu Zhong-Yong Yuan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第10期14-21,共8页
The design and development of low-cost,efficient,and stable bifunctional electrocatalysts for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are desirable for rechargeable metal-air batteries.In t... The design and development of low-cost,efficient,and stable bifunctional electrocatalysts for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are desirable for rechargeable metal-air batteries.In this work,N-doped porous hollow carbon spheres encapsulated with ultrafine Fe/Fe3O4 nanoparticles(FeOx@N-PHCS)were fabricated by impregnation and subsequent pyrolysis,using melamine-formaldehyde resin spheres as self-sacrifice templates and polydopamine as N and C sources.The sufficient adsorption of Fe3+on the polydopamine endowed the formation of Fe-Nx species upon high-temperature carbonization.The prepared FeOx@N-PHCS has advanced features of large specific surface area,porous hollow structure,high content of N dopants,sufficient Fe-Nx species and ultrafine FeOx nanoparticles.These features endow FeOx@N-PHCS with enhanced mass transfer and considerable active sites,leading to high activity and stability in catalyzing ORR and OER in alkaline electrolyte.Furthermore,the rechargeable Zn-air battery with FeOx@N-PHCS as air cathode catalyst exhibits a large peak power density,narrow charge-discharge potential gap and robust cycling stability,demonstrating the potential of the fabricated FeOx@N-PHCS as a promising electrode material for metal-air batteries.This new finding may open an avenue for rational design of bifunctional catalysts by integrating different active components within all-in-one catalyst for different electrochemical reactions. 展开更多
关键词 Bifunctional electrocatalysts Rechargeable metal-air batteries N-doped porous carbon nanostructure Fe/Fe3O4 nanoparticles Fe-Nx species
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RhB Adsorption Performance of Magnetic Adsorbent Fe_3O_4/RGO Composite and Its Regeneration through A Fenton-like Reaction 认领 引用 被引量：15
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作者 Yalin Qin Mingce Long +1 位作者 Beihui Tan Baoxue Zhou 《Nano-Micro Letters》 SCIE EI CAS 2014年第2期125-135,共11页
Adsorption is one of the most effective technologies in the treatment of colored matter containing wastewater. Graphene related composites display potential to be an effective adsorbent. However, the adsorption mechan... Adsorption is one of the most effective technologies in the treatment of colored matter containing wastewater. Graphene related composites display potential to be an effective adsorbent. However, the adsorption mechanism and their regeneration approach are still demanding more efforts. An effective magnetically separable absorbent, Fe3O4 and reduced graphene oxide(RGO) composite has been prepared by an in situ coprecipitation and reduction method. According to the characterizations of TEM, XRD, XPS, Raman spectra and BET analyses, Fe3O4 nanoparticles in sizes of 10-20 nm are well dispersed over the RGO nanosheets, resulting in a highest specific area of 296.2 m2/g. The rhodamine B adsorption mechanism on the composites was investigated by the adsorption kinetics and isotherms. The isotherms are fitting better by Langmuir model, and the adsorption kinetic rates depend much on the chemical components of RGO. Compared to active carbon, the composite shows 3.7 times higher adsorption capacity and thirty times faster adsorption rates. Furthermore,with Fe3O4 nanoparticles as the in situ catalysts, the adsorption performance of composites can be restored by carrying out a Fenton-like reaction, which could be a promising regeneration way for the adsorbents in the organic pollutant removal of wastewater. 展开更多
关键词 Magnetic adsorbent Fe3O4 nanoparticles Reduced grapheme oxide Fenton-likereaction Regeneration
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Preparation of a novel magnetic powder resin for the rapid removal of tetracycline in the aquatic environment 认领 引用 被引量：7
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作者 Qing Zhou Man Cheng Zhang +2 位作者 Chen Dong Shuang Zhe Qin Li Ai Min Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2012年第6期745-748,共4页
Magnetic powder resin Q150 with high specific surface area of 1074 m2/g was prepared by the membrane emulsificationsuspension polymerization technique.Adsoption of tetracycline on the obtained sorbent Q150 was evalute... Magnetic powder resin Q150 with high specific surface area of 1074 m2/g was prepared by the membrane emulsificationsuspension polymerization technique.Adsoption of tetracycline on the obtained sorbent Q150 was evaluted by using the granule resin(GR)XAD-4,the powder activated carbon(PAC)1240AC and the granule activated carbon(GAC)HD4000 for comparison.It was found that Q150 had a larger adsorption capacity,faster kinetic and easier regeneration under alkaline condition.The results suggested that the powder resin(PR)Q150 would be a promising sorbent for removing antibiotics and even other organic micropollutants from the aquatic environment. 展开更多
关键词 Micropollutant Antibiotics Fe3O4 nanoparticles Hypercrosslinked resin Adsorption
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Preparation and characterization of cross-linked β-cyclodextrin polymer/Fe_3O_4 composite nanoparticles with core-shell structures 认领 引用 被引量：7
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作者 Rui Xue Li Shu Mei Liu +2 位作者 Jian Qing Zhao Hideyuki Otsuka Atsushi Takahara 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第2期217-220,共4页
Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparti... Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparticles inβ-cyclodextrin alkaline solution by using epichlorohydrin as crosslinking agent.The morphology,structure and magnetic properties of the prepared composite nanoparticles were investigated by transmission electron microscopy（TEM）,Fourier transform infrared（FTIR） spectrometry,X-ray diffraction（XRD） measurement,thermogravimetric analysis（TGA） and Vibrating sample magnetometry （VSM）,respectively. 展开更多
关键词 Cross-linkedβ-cyclodextrin polymer Fe3O4 nanoparticles Composite nanoparticles Core-shell structures
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Surface Organic Modification of Fe_3O_4 Magnetic Nanoparticles 认领 引用 被引量：5
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作者 CUI Sheng SHEN Xiaodong +2 位作者 LIN Benlan JIANG Guodong ZHANG Weihua 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第4期436-439,共4页
The surface organic modification of Fe3O4 nanoparticles with silane coupling reagent KH570 was studied.The modified and unmodified nanoparticles were characterized by FT-IR,XPS and TEM.The spectra of FT-IR and XPS rev... The surface organic modification of Fe3O4 nanoparticles with silane coupling reagent KH570 was studied.The modified and unmodified nanoparticles were characterized by FT-IR,XPS and TEM.The spectra of FT-IR and XPS revealed that KH570 was coated onto the surface of Fe3O4 nanoparticles to get Fe-O-Si bond and an organic coating layer also was formed.Fe3O4 nanoparticles were spheres partly with mean size of 18,8 nm studied by TEM,which was consistent with the result 17.9 nm calculated by Scherrer's equation.KH570 was adsorbed on surface and formed chemistry bond to be steric hindrance repulsion which prevented nanoparticles from reuniting.Then glycol-based Fe3O4 magnetic liquids dispersed stably was gained. 展开更多
关键词 Fe3O4 nanoparticles KH570 surface organic modification chemical adsorb dispersivity
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Size-dependent peroxidase-like catalytic activity of Fe_3O_4 nanoparticles 认领 引用 被引量：22
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作者 Fang Fang Peng YU Zhang Ning Gu 《Chinese Chemical Letters》 SCIE CAS 2008年第6期730-733,共4页
Peroxidase-like catalytic properties of Fe3O4 nanoparficles （NPs） with three different sizes, synthesized by chemical coprecipitation and sol-gel methods, were investigated by UV-vis spectrum analysis. By comparing ... Peroxidase-like catalytic properties of Fe3O4 nanoparficles （NPs） with three different sizes, synthesized by chemical coprecipitation and sol-gel methods, were investigated by UV-vis spectrum analysis. By comparing Fe3O4 NPs with average diameters of 11, 20, and 150 nm, we found that the catalytic activity increases with the reduced nanoparticle size. The electrochemical method to characterize the catalytic activity of Fe3O4 NPs using the response currents of the reaction product and substrate was also developed. 展开更多
关键词 Fe3O4 nanoparticles Peroxidase-like catalytic activity Electrochemistry
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Intensification of levofloxacin sono-degradation in a US/H_2O_2 system with Fe_3O_4 magnetic nanoparticles 认领 引用 被引量：6
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作者 魏红 胡妲 +1 位作者 苏洁 李克斌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期296-302,共7页
Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale... Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics. 展开更多
关键词 Fe3O4 magnetic nanoparticles H2O2 Levofloxacin Sonolysis HPLC/MS/MS Degradation pathway
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Folate-conjugated Fe_3O_4 nanoparticles for in vivo tumor labeling 认领 引用 被引量：2
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作者 周春姣 王少华 +4 位作者 周宇 容鹏飞 陈孜孜 刘进言 周建大 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第7期2079-2084,共6页
Highly biocompatible superparamagnetic Fe3O4 nanoparticles were synthesized by amide of folic acid （FA） ligands and the NH2-group onto the surface of Fe3O4 nanoparticles. The as-synthesized folate-conjugated Fe3O4 n... Highly biocompatible superparamagnetic Fe3O4 nanoparticles were synthesized by amide of folic acid （FA） ligands and the NH2-group onto the surface of Fe3O4 nanoparticles. The as-synthesized folate-conjugated Fe3O4 nanoparticles were characterized by X-ray diffraction diffractometer, transmission electron microscope, FT-IR spectrometer, vibrating sample magnetometer, and dynamic light scattering instrument. The in vivo labeling effect of folate-conjugated Fe3O4 nanoparticles on the hepatoma cells was investigated in tumor-bearing rat. The results demonstrate that the as-prepared nanoparticles have cubic structure of Fe3O4 with a particle size of about 8 nm and hydrated diameter of 25.7 nm at a saturation magnetization of 51 A·m2/kg. These nanoparticles possess good physiological stability, low cytotoxicity on human skin fibroblasts and negligible effect on Wistar rats at the concentration as high as 3 mg/kg body mass. The folate-conjugated Fe3O4 nanoparticles could be effectively mediated into the human hepatoma Bel 7402 cells through the binding of folate and folic acid receptor, enhancing the signal contrast of tumor tissue and surrounding normal tissue in MRI imaging. It is in favor of the tumor cells labeling, tracing, magnetic resonance imaging （MRI） target detection and magnetic hyperthermia. 展开更多
关键词 Fe3O4 nanoparticles superparamagnetic property folic acid tumor conjugation magnetic resonance imaging （MRI） cell labeling
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Design and Fabrication of Superparamaganitic Hybrid Microspheres for Protein Immobilization 认领 引用 被引量：2
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作者 REN Qi CHU Hong +2 位作者 CHEN Mingqing NI Zhongbin CHEN Qiuyun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第6期1084-1088,共5页
Superparamagnetic poly(styrene)-co-poly(2-acrylanmido-2-methyl propanesulfonic acid)(PSt-co-PAMPS)and poly(methylmethacrylate)-co-poly(glycidyl methacrylate)(PMMA-co-PGMA)microspheres with mean size of 170 nm were pre... Superparamagnetic poly(styrene)-co-poly(2-acrylanmido-2-methyl propanesulfonic acid)(PSt-co-PAMPS)and poly(methylmethacrylate)-co-poly(glycidyl methacrylate)(PMMA-co-PGMA)microspheres with mean size of 170 nm were prepared by emulsion polymerization in the presence of oleic acid-coated Fe3O4 nanoparticles.The structures,morphologies,diameter and diameter distribution of the as-prepared microspheres were identified by Fourier transform infrared spectroscopy(FT-IR)and transmission electron microscopy(TEM).The saturation magnetizations of PSt-co-PAMPS and PMMA-co-PGMA microspheres are 21.94 and 25.07 emu/g,respectively.The as-synthesized magnetic microspheres were used for immobilization of Bovine serum albumin(BSA)by physical interaction and covalent interaction respectively.The equilibrium amount of BSA immobilized onto PMMA-co-PGMA microspheres was 86.48 mg/g microspheres in 90 min,while on PSt-co-PAMPS microspheres was 59.62 mg/g microspheres in 120 min. 展开更多
关键词 Fe3O4 nanoparticles emulsion polymerization magnetic composite microspheres protein immobilization
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Characteristics of magnetic Fe_3O_4 nanoparticles encapsulated with human serum albumin 认领 引用 被引量：4
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作者 何捍卫 刘红江 +2 位作者 周科朝 王维 容鹏飞 《Journal of Central South University of Technology》 2006年第1期6-11,共6页
Magnetic nanoparticles （Fe304） were prepared by chemical precipitation method using Fe^2＋ and Fe^3＋ salts with sodium hydroxide in the nitrogen atmosphere. Fe3O4 nanoparticles were coated with human serum albumin... Magnetic nanoparticles （Fe304） were prepared by chemical precipitation method using Fe^2＋ and Fe^3＋ salts with sodium hydroxide in the nitrogen atmosphere. Fe3O4 nanoparticles were coated with human serum albumin（HSA） for magnetic resonance imaging as contrast agent. Characteristics of magnetic particles coated or uncoated were carried out using scanning electron microscopy and X-ray diffraction. Zeta potentials, package effects and distributions of colloid particles were measured to confirm the attachment of HSA on magnetic particles. Effects of Fe3O4 nanoparticles coated with HSA on magnetic resonance imaging were investigated with rats. The experimental results show that the adsorption of HSA on magnetic particles is very favorable to dispersing of magnetic Fe3O4 particles, while the sizes of Fe3O4 particles coated are related to the molar ratio of Fe3O4 to HSA. The diameters of the majority of particles coated are less than 100 nm. Fe3O4 nanoparticle coated with HSA has a good biocompatibility and low toxicity. This new contrast agent has some effects on the nuclear magnetic resonance imaging of liver and the lowest dosage is 20μmol/kg for the demands of diagnosis. 展开更多
关键词 Fe3O4 nanoparticle human serum albumin chemical precipitation method magnetic resonance imaging contrast agent
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Controllable Synthesis and Magnetic Properties of Monodisperse Fe_3O_4 Nanoparticles 认领 引用 被引量：1
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作者 王朱良 马慧 +3 位作者 王芳 李敏 张利国 许小红 《Chinese Physics Letters》 SCIE EI CAS CSCD 2016年第10期107-111,共5页
Magnetite （Fe3O4） nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the g... Magnetite （Fe3O4） nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the growth mechanism in detail. It is found that the size and shape of nanoparticles are determined by adjusting the precursor concentration and duration time, which can be well explained by the mechanism based on the LaMer model in our synthetic system. The monodisperse Fe3O4 nanoparticles have a mean diameter from 5nm to 16nm, and shape evolution from spherical to triangular and cubic. The magnetic properties are size-dependent, and Fe3O4 nanoparticles in small size about 5 nm exhibit superparamagnetie properties at room temperature and maximum saturation magnetization approaches to 78 emu/g, whereas Fe3O4 nanoparticles develop ferromagnetic properties when the diameter increases to about 16nm. 展开更多
关键词 Fe acac in is on of Controllable Synthesis and Magnetic Properties of Monodisperse Fe3O4 Nanoparticles
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Fe_3O_4 Magnetic Nanoparticles Modified Electrode as a Sensor for Determination of Nimesulide 认领 引用 被引量：1
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作者 ZHANG Jin-lei TAN Xue-cai +4 位作者 ZHAO Dan-dan TAN Sheng-wei LIU Li WANG Lin HUANG Zeng-wei 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2011年第4期566-569,共4页
A novel type of Fe3O4 nanoparticles modified glass carbon electrode（Fe3O4/GCE） was constructed and the electrochemical properties of N-（4-nitro-2-phenoxyphenyl）methanesulfonamide（nimesulide） were studied on the ... A novel type of Fe3O4 nanoparticles modified glass carbon electrode（Fe3O4/GCE） was constructed and the electrochemical properties of N-（4-nitro-2-phenoxyphenyl）methanesulfonamide（nimesulide） were studied on the Fe3O4/GCE.In 0.4mol/L HAc-NaAc buffer solution（pH=5.0）,the electrode process of nimesulide was irreversible at bare GCE and Fe3O4/GCE.The Fe3O4/GCE exhibited a remarkable catalytic and enhancement effect on the reduction of nimesulide.The reduction peak potential of nimesulide shifted positively from-0.683 V at bare GCE to-0.625 V at Fe3O4/GCE,and the sensitivity was increased by ca.3 times.Some experimental conditions were optimized.The linear range between the peak current and the concentration of nimesulide was 2.6×10-6 ＂1.0×10-4mol/L（R=0.993） with a detection limit of 1.3×10-7mol/L.This method has been used to determine the content of nimesulide in medical tablets.The recovery was determined to be 96.9% ＂101.9% by means of standard addition method.The method is comparable to UV-Vis spectrometry. 展开更多
关键词 Fe3O4 nanoparticle Modified electrode Nimesulide Determination Electrochemical behavior
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Gap-plasmon of Fe3O4@Ag Core-shell Nanostructures for Highly Enhanced Fluorescence Detection of Rhodamine B 认领 引用 被引量：5
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作者 王运佳 俎喜红 +2 位作者 易国斌 LUO Hongsheng HUANG Hailiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第2期264-271,共8页
A novel gap-plasmon of Fe3O4@Ag core-shell nanoparticles for surface enhanced fluorescence detection of Rhodamine B（RB） was developed. Fe3O4@Ag core-shell nanostructures with Ag shell and Fe3O4 core were synthetized... A novel gap-plasmon of Fe3O4@Ag core-shell nanoparticles for surface enhanced fluorescence detection of Rhodamine B（RB） was developed. Fe3O4@Ag core-shell nanostructures with Ag shell and Fe3O4 core were synthetized by self-assembled method with the assistance of 3-mercaptopropyl trimethoxy silane（MPTS）. To study the RB fluorescence enhanced by gap-plasmon, the fluorescence properties of RB on the substrates with different nanogap densities were systematically investigated, and the results showed that the fluorescence intensity of RB on Fe3O4@Ag core-shell NPs substrate was much stronger than that on bare glass substrate, and the fluorescence intensity was further improved by using multilayer Fe3O4@Ag core-shell NPs substrate which had higher nanogap density. Different from the mechanism that is based on the maximum overlap of the surface plasmon resonance（SPR） band and emission band, the mechanism of the fluorescence enhancement in our work is based on the localized surface plasmon（LSP） and the gap plasmon near-field coupling with the Fe3O4@Ag core-shell NPs. Besides, the detection limit obtained was as low as 1×10^（-7） mol/L, and the Fe3O4@Ag core-shell NPs substrate had high selectivity for RB fluorophores. It was demonstrated that the Fe3O4@Ag core-shell NPs substrate had activity, good stability, and selectivity for fluorescence detection of RB. And the detection of RB by the surface plasmon enhanced fluorescence was more convenient and rapid than the traditional detection methods in previous works. 展开更多
关键词 gap-plasmon self-assembled Fe3O4@Ag nanoparticles core-shell fluorescence enhancement
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Sono-assisted preparation of magnetic ferroferric oxide/graphene oxide nanoparticles and application on dye removal 认领 引用 被引量：8
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作者 江国栋 常青 +2 位作者 杨福福 胡晓允 唐和清 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第3期510-515,共6页
A simple ultrasound-assisted co-precipitation method was developed to prepare ferroferric oxide/graphene oxide magnetic nanoparticles(Fe_3O_4/CO MNPs).The hysteresis loop of Fe_3O_4/GO MNPs demonstrated that the sampl... A simple ultrasound-assisted co-precipitation method was developed to prepare ferroferric oxide/graphene oxide magnetic nanoparticles(Fe_3O_4/CO MNPs).The hysteresis loop of Fe_3O_4/GO MNPs demonstrated that the sample was typical of superparamagnetic material.The samples were characterized by transmission electron microscope,and it is found that the particles are of small size.The Fe_3O_4/GO MNPs were further used as an adsorbent to remove Rhodamine B.The effects of initial pH of the solution,the dosage of adsorbent,temperature,contact time and the presence of interfering dyes on adsorption performance were investigated as well.The adsorption equilibrium and kinetics data were fitted well with the Freundlich isotherm and the pseudosecond-order kinetic model respectively.The adsorption process followed intra-particle diffusion model with more than one process affecting the adsorption of Rhodamine B.And the adsorption process was endothermic in nature.Furthermore,the magnetic composite with a high adsorption capacity of Rhodamine B could be effectively and simply separated using an external magnetic field.And the used particles could be regenerated and recycled easily.The magnetic composite could find potential applications for the removal of dye pollutants. 展开更多
关键词 Fe3O4/graphene oxide nanoparticles Sonochemical synthesis Adsorption Kinetic modeling Equilibrium Regeneration
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Modification of Fe_3O_4 Magnetic Nanoparticles by L-dopa or Dopamine as an Enzyme Support 认领 引用 被引量：1
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作者 PENG Hong ZHANG Xiao +1 位作者 HUANG Kaixun XU Huibi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第4期480-485,共6页
Fe3O4 magnetic nanoparticles were prepared by co-precipitation of Fe^2+and Fe^3+in an ammonia solution,and its size was about 36 nm measured by an atomic force microscope.Fe3O4 magnetic nanoparticles were modified by ... Fe3O4 magnetic nanoparticles were prepared by co-precipitation of Fe^2+and Fe^3+in an ammonia solution,and its size was about 36 nm measured by an atomic force microscope.Fe3O4 magnetic nanoparticles were modified by L-dopa or dopamine using sonication method.The analysis of FTIR clearly indicated the formation of Fe-O-C bond.Direct immobilization of trypsin(EC:3.4.21.4)on Fe3O4 magnetic nanoparticles with L-dopa and dopamine spacer was investigated using glutaraldehyde as a coupling agent.No significant changes in the size and magnetic property of the three kinds of magnetic nanoparticles linked with or without trypsin were observed.The existence of the spacer molecule on magnetic nanoparticles could greatly improve the activity and the storage stability of bound trypsin through increasing the flexibility of enzyme and changing the microenvironment on nanoparticles surface compared to the naked magnetic nanoparticles. 展开更多
关键词 Fe3O4 magnetic nanoparticles modification trypsin immobilization L-dopa dopamine
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Synthesis of Magnetically Modified Fe-Al Pillared Bentonite and Heterogeneous Fenton-like Degradation of Orange II 认领 引用 被引量：2
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作者 陈坤 WANG Guanghua +5 位作者 李文兵 WAN Dong HU Qin LU Lulu WEI Xiaobi CHENG Zhengzai 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期302-306,共5页
Magnetically modified Fe-Al pillared bentonite（Fe3O4/ Fe-Al-Bent） was prepared via chemical co-precipitation method and characterized by powder X-ray diffraction（XRD）, Brunauer-EmmettTeller（BET）, Fourier transfo... Magnetically modified Fe-Al pillared bentonite（Fe3O4/ Fe-Al-Bent） was prepared via chemical co-precipitation method and characterized by powder X-ray diffraction（XRD）, Brunauer-EmmettTeller（BET）, Fourier transform infrared spectroscopy（FTIR） and scanning electron microscopy（SEM）. A series of experiments were carried out to investigate the degradation of Orange II by the obtained heterogeneous catalysts in the presence of H2O2. The experimental result indicated that the synthetic materials had a high catalytic activity and good reusability. 展开更多
关键词 Fe3O4 nanoparticles pillared bentonite heterogeneous Fenton-like Orange II
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Construction of a Caco-2/EAhy926 cell tandem compound model and its application in mechanism study of nanoparticle transcytosis 认领 引用
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作者 AnPu Yang Bei Wei +6 位作者 Jiafang Song Xiangfu Guo Yuxi Cheng Bing He Hua Zhang Xueqing Wang Qiang Zhang 《Journal of Chinese Pharmaceutical Sciences》 CAS CSCD 2018年第7期478-489,共12页
Based on the physiological structure of the intestine,a Caco-2/EAhy926 tandem compound model was constructed in order to simulate the intestinal-vascular barrier.This model was applied in the study of transcytosis of ... Based on the physiological structure of the intestine,a Caco-2/EAhy926 tandem compound model was constructed in order to simulate the intestinal-vascular barrier.This model was applied in the study of transcytosis of nanoparticles,and it was compared with the traditional intestinal cell model in the whole study.Briefly,Fe3O4 nanoparticles with a size about 30 nm were used as model nanoparticles,which remained steady during transcytosis.The nanoparticles hardly had cytotoxicity to Caco-2 cells and EAhy926 cells within the incubation concentrations.The cell tandem model was established by connecting upper Caco-2 monolayer and lower EAhy926 monolayer.Based on the FD4 permeability or TEER,all cell models remained integrity within certain period of culture time.The expression of Claudin-4 or VE Cadherin demonstrated the presence of tight junctions.The intact morphology of microfilament F-actin indicated the favorable intracellular connection.It was found that the two-layer cell tandem model created a bigger barrier for the transcytosis of FD4 than Caco-2 and EAhy926 monolayer models,and the translocation of Fe3O4 nanoparticles showed a similar pattern.Interestingly,we found that the main barrier of tandem model for nanoparticles was caused by the upper Caco-2 cell monolayer,while the lower layer of EAhy926 monolayer remained high permeability.Generally,the cell tandem compound model established here enabled us to evaluate the impact of both intestinal epithelial and endothelial layer on transcytosis,and it might provide a novel approach to study bio-nano interaction in the intestine. 展开更多
关键词 Caco-2 cells EAhy926 cells Tandem cell model Fe3O4 nanoparticles Trans-membrane Transport mechanism
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Synthesis and characterization of Fe_3O_4 magnetic nanoparticles and their heating effects under radiofrequency capacitive field 认领 引用
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作者 李旭红 冯志明 +3 位作者 欧阳伟炜 谢小雪 廖遇平 唐劲天 《Journal of Central South University》 SCIE EI CAS 2010年第6期1185-1189,共5页
Fe3O4 magnetic nanoparticles with diameters varying from 10 to 426 nm were synthesized and characterized.Heating effects of Fe3O4 magnetic nanoparticles under radiofrequency capacitive field(RCF) with frequency of 27.... Fe3O4 magnetic nanoparticles with diameters varying from 10 to 426 nm were synthesized and characterized.Heating effects of Fe3O4 magnetic nanoparticles under radiofrequency capacitive field(RCF) with frequency of 27.12 MHz and power of 60-150 W were investigated.When the power of RCF is lower than 90 W,temperatures of Fe3O4 magnetic nanoparticles(75-150 mg/mL) can be raised and maximal temperatures are all lower than 50 ℃.When the power of RCF is 90-150 W,temperatures of Fe3O4 magnetic nanoparticles can be quickly raised and are all obviously higher than those of normal saline and distilled water under the same conditions.Temperature of Fe3O4 magnetic nanoparticles can even reach 70.2 ℃ under 150 W RCF.Heating effects of Fe3O4 magnetic nanoparticles are related to RCF power,particle size and particle concentration. 展开更多
关键词 Fe3O4 magnetic nanoparticles radiofrequency capacitive field synthesis characterization heating effects
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