COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
·
IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 12
·1816-1824
·
IF 1.158
Qin Huihao,Zhang Wei,Luo Yi,Wei Yubo,Sun Shenglu,Chen Jingya
Polylactic acid glycolic acid (PLGA), a polymer material, is used as a shell and perfluorooctane (PFOB) as the core. Fe3O4@SiO2 nanoparticles are distributed in the shell to prepare a magnetic phase change multifunctional nano emulsion contrast agent
(Fe3O4@SiO2/PLGA/PFOB). The ultrasound, magnetic resonance imaging and CT imaging effects of the contrast agent on normal rat liver parenchyma are investigated. Methods: Single emulsification method is used to prepare Fe3O4@SiO2-loaded
polymer Fe3O4@SiO2/PLGA/PFOB nanoparticles encapsulated with PLGA. In addition, polymer Fe3O4@SiO2/PLGA nanoparticles loaded with Fe3O4@SiO2 nanoparticles, PLGA@PFOB nanoparticles coated with
PLGA and blank PLGA nanoparticles are prepared as experimental control group. Its surface morphology, internal structure, particle size, potential and other general characteristics are tested. RAW264.7 mouse mononuclear macrophages are cultured in vitro. Prussian blue staining is used
to observe macrophage phagocytosis after Fe3O4@SiO2/PLGA/PFOB contrast agent is added to incubate for 3 hours. MTT method is used to detect the effect of contrast agent on cell activity. The macrophage suspension engulfed with Fe3O4-PFOB
is examined by ultrasound, magnetic resonance and CT. The results showed that Fe3O4@SiO2/PLGA/PFOB is brown emulsion after being dissolved in double distilled water. Under the light microscope and scanning electron microscope, Fe3O4@SiO2/PLGA/PFOB
is spherical, with regular shape, uniform size, good dispersity and smooth surface. Macrophages are dependent on the phagocytosis of the contrast medium without affecting the activity of macrophages. Moreover, in vitro imaging experiments, compared with the control group, macrophages
phagocytized by Fe3O4@SiO2/PLGA/PFOB have obvious enhancement effects in ultrasound, magnetic resonance and CT imaging. In conclusion, Fe3O4@SiO2/PLGA/PFOB has good stability in vivo, can be engulfed by liver macrophages,
and can enhance ultrasound, magnetic resonance and CT imaging of liver parenchyma. It is a safe and effective multifunctional ultrasound contrast agent.
研究领域:
医学影像学
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材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Yaohui Xu,Yang Zhou,Wenhui Ma,Shixing Wang,Shaoyuan Li
The Fe 3 O 4 nanoparticles [NPs] coated with silica nanoparticles were designed to produce magnetic core–shell Fe 3 O 4 @SiO 2 NPs, which were modified with rhodamine B derivatives and defined as Fe 3 O 4 @SiO 2 -Rho NPs. The obtained Fe 3 O 4 @SiO 2 -Rho NPs served as a fluorescent OFF-ON nanosensor was utilized to detect Zn 2+ selectively in acetonitrile medium. The Fe 3 O 4 @SiO 2 -Rho NPs exhibited selective “turn-on” type fluorescent enhancements and distinct color changes with Zn 2+ . The Fe 3 O 4 @SiO 2 -Rho NPs also showed a high capacity for removal of Zn 2+ at room temperature. The removal efficiency toward Zn 2+ was about 87.34%. In addition, the presence of magnetic Fe 3 O 4 particles as core in Fe 3 O 4 @SiO 2 -Rho NPs could facilitate the magnetic separation of the Fe 3 O 4 @SiO 2 -Rho-Zn 2+ from the solution.
研究领域:
分析化学
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材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 86
·45920-45929
·
IF 3.708
Lisha Tan,Jiang Xu,Xiaoqin Xue,Zimo Lou,Jin Zhu,Shams Ali Baig,Xinhua Xu
Silica-coated magnetite (Fe3O4@SiO2) nanoparticles functionalized with amino, imino and sulfonic groups (Fe3O4@SiO2–mPD/SP) were successfully synthesized via a facile chemical oxidative polymerization of m-phenylenediamine (mPD) and m-sulfophenylenediamine-4-sulfonic acid (SP) monomers, and utilized for selective removal of Pb(II) and Cr(VI) from aqueous solutions. It was revealed by the characterizations that the polymers formed on Fe3O4@SiO2 nanoparticles were the true copolymers with a mPD–SP unit, rather than a mixture of mPD and SP homopolymers. Fe3O4@SiO2–mPD/SP nanocomposites could be easily separated from aqueous solutions within 30 s. The maximum adsorption capacities of Pb(II) (83.23 mg g−1) and Cr(VI) (119.06 mg g−1) on Fe3O4@SiO2–mPD/SP nanocomposites were obtained at the mPD/SP molar ratios of 95 : 5 and 50 : 50, respectively. Moreover, satisfactory selective removal of Pb(II) and Cr(VI) from their mixtures with Cu(II) and Ni(II) ions were exhibited by the Fe3O4@SiO2–mPD/SP (95 : 5) and Fe3O4@SiO2–mPD/SP (50 : 50), respectively. The Pb(II) adsorption equilibrium was reached within 5 min by Fe3O4@SiO2–mPD/SP (95 : 5). The adsorption data of Pb(II) and Cr(VI) were both fitted well to the Freundlich isotherm and followed the pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) and Cr(VI) on Fe3O4@SiO2–mPD/SP nanocomposites included five processes, namely: ion-exchange, complexation adsorption, reduction reaction, electrostatic attraction and physical adsorption. The enhanced adsorption performance of nanoparticle-based magnetic adsorbents for selective removal of heavy metal ions can be achieved with such a copolymerization strategy.
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
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 6
·1-9
·
IF 2.175
Xu Yaohui,Zhou Yang,Ma Wenhui,Wang Shixing,Li Shaoyuan
Abstract The Fe 3 O 4 nanoparticles [NPs] coated with silica nanoparticles were designed and prepared, the obtained Fe 3 O 4 @SiO 2 NPs have uniform spherical morphology with a mean diameter of about 22 nm. The inert silica coating on the surface of Fe 3 O 4 NPs not only significantly prevented their aggregation in solution but also improved their chemical stability and provided wider sites for surface modification with organic chemosensors. Subsequently an attempt had been made that the as-synthesized Fe 3 O 4 @SiO 2 NPs were modified by N -(rhodamine-6G) lactam–ethylenediamine, the functionalized magnetic Fe 3 O 4 @SiO 2 NPs (Fe 3 O 4 @SiO 2 -Rho) served as a “naked eye” fluorescent sensor to detect Hg 2+ . The Fe 3 O 4 @SiO 2 -Rho NPs exhibited selective “turn-on” type fluorescent change from colorless to orange when adding to Hg 2+ . In addition, the adsorption experiments revealed that the Fe 3 O 4 @SiO 2 -Rho NPs had effective removal toward Hg 2+ . Moreover, the functionalized Fe 3 O 4 @SiO 2 microspheres displayed superparamagnetic properties, which made it easier to separate the nanocomposites from the liquid phase by adding an external magnetic field. Our efforts provided a potential magnetic nanomaterial for sensitive detection and removal toward Hg 2+ simultaneously. Graphical Abstract A rhodamine 6G derivative functionalized Fe 3 O 4 @SiO 2 nanoparticles were designed and synthesized (as Fe 3 O 4 @SiO 2 -Rho). The Fe 3 O 4 @SiO 2 -Rho exhibited selective “turn-on” type fluorescent change from colorless to orange with Hg 2+ , which constituted an Hg 2+ -selective fluorescent colorimetric nanosensor.
研究领域:
材料科学
·
环境化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingpeng Zhu,Jiaojiao Song,Zhaofei Liu,Konglin Wu,Xiangzi Li,Zhiming Chen,Huan Pang
Efficient and convenient degradation of industrial organic pollutants are of great importance for green chemical schemes and cost-effectiveness. This work introduced the immobilization of laccase on Fe 3 O 4 @SiO 2 nanoparticles (Fe 3 O 4 @SiO 2 -laccase) for photothermal catalytic degradation of textile dyes. The Fe 3 O 4 @SiO 2 -laccase presented excellent reusability, improved thermal and pH stabilities, and remarkable organic compounds, inhibitors and metal ions tolerance. Batch experiments indicate that the maximum loading amount and activity recovery for laccase were about 10.5 mg/g and 109.7%, respectively. Meanwhile, the immobilized laccase was employed for photothermal catalytic degradation of textile dyes. The degradation assays revealed that the initial removal efficiencies were 99.6%, 99.5%, 94.6%, 94.2%, 89.4% and 79.3% for high concentrations of malachite green (MG), brilliant green (BG), reactive blue 19 (RB19), azophloxine, procion red MX-5B and alizarin red in 30–60 min illumination, respectively. Even after 10 recycling cycles, the photothermal catalytic degradation rates of the textile dyes were observed at 98.7%, 99.3%, 88.8%, 79.0%, 78.7% and 64.4%, respectively. The outstanding photothermal catalytic performances demonstrated that the Fe 3 O 4 @SiO 2 -laccase has a technical application in wastewater treatment .
研究领域:
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
Yaohui Xu,Yang Zhou,Wenhui Ma,Shixing Wang
The magnetic Fe3O4@SiO2 nanoparticles (NPs) functionalized with 8-chloroacetylaminoquinoline as a fluorescent sensor for detection and removal of Zn2+ have been synthesized. The core-shell structures of the nanoparticles and chemical composition have been confirmed by TEM, XRD, FTIR, and XPS techniques. The addition of functionalized Fe3O4@SiO2 NPs into the acetonitrile solution of Zn2+ had an effect of visual color change as well as significant fluorescent enhancement. High-saturated magnetizations (24.7 emu/g) of functionalized Fe3O4@SiO2 NPs could help to separate the metal ions from the aqueous solution. The magnetic sensor exhibited high removal efficiency towards Zn2+ (92.37%). In this work, we provided an easy and efficient route to detect Zn2+ and simultaneously remove Zn2+.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2019
·
IF 0
Su-Na Yin,Juan Liu,Defeng Wu,Su Chen,Weiwei Xia
As important biological functions of many creatures, structural colors and self-healing features play crucial roles in the survival of organisms. Inspired by these features, the intelligent self-healing colloidal photonic crystals (CPCs) materials with stable structural colors are constructed here by immobilizing magnetically assembling Fe3O4@SiO2 colloidal nanoparticles into a self-repairing hydrogel matrix. The self-repairing hydrogels, prepared by using biodegradable material poly(1-vinyl-2-pyrrolidinone-co-acrylamide) modified with O-carboxymethyl chitosan (O-CMC), exhibit an outstanding mechanical property with favorable toughness and elasticity. Interestingly, one-dimensional Fe3O4@SiO2 chain structures embedded in the framework can maintain the stability of the photonic band-gap structure and its resultant bright structural colors. Furthermore, O-CMC contained in the matrix can supply plentiful carboxyl, amino, and hydroxyl functional groups which can form abundant intermolecular hydrogen bonds, and thus give the robust self-healing capability to the CPC colored hydrogels. On the basis of such CPCs hydrogels with bright structural colors and robust self-healing properties, a 3D flower pattern has been designed to realize arbitrary 3D configurable modeling. This work might constitute a promising simple way to fabricate structural colored CPC materials with a longer functional life, and thus extend their practical applications.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
MACROMOLECULES
·
2024
·
IF 5.1
Yajing Yang,Fenglin Li,Dayin Sun,Yilan Ye,Zhenzhong Yang
A new method is proposed to large-scale synthesize reactive Janus inorganic/polymer colloidal dimers by electrostatics-mediated intramolecular crosslinking of the tethered diblock copolymer single-chain of PVSt-b-PmSt at an example inorganic NP of Fe3O4@SiO2. Tethering the single-chain is achieved by terminating the anionic living polymer onto the chloromethylphenyl- group capped NP. While the electrostatic interaction is introduced by complexation of the mercaptoacetic acid (MA) clicked PVSt block with 1-methylimidazole (MI), the intramolecular crosslinking is achieved with 1,6-hexanediisothiocyanate (HDI). The example dimer of cPVSt-b-PmSt-Fe3O4@SiO2 could be synthesized in a highly concentrated dispersion up to 100 mg/mL. The amphiphilic Janus colloidal dimer is effective to manipulate the stabilized emulsion droplets with a magnet. The parent colloidal dimer is highly reactive with residual chloromethylphenyl-, cyanate, and carboxylic acid groups at different sites to assist deriving a family of functional dimers by simple modifications.
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
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 7
·1043-1051
·
IF 1.401
Zhao Aixia,Xu Zhiqiang,Ma Liyi,Tian Zhenfeng,Gan Wuer
We report on the synthesis of Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column via in situ polymerization. The monolith had larger specific surface area and relatively uniform porous structure and was characterized by scanning electron microscopy, nitrogen adsorption–desorption, and Fourier transform infrared spectroscopy. The monolith was then applied for the evaluation of gas chromatography separation properties. Here, an electromagnetic induction heating technique was employed to control the column temperature with the thermal effect of eddy current in ferromagnetic materials Fe 3 O 4 . The monolith offered good separation efficiency for benzene and toluene and a higher column efficiency was obtained up to 4481 and 9216 plates per meter, respectively. In addition, the injection volume and column capacity of the proposed system are as much as 5 µL and 100 ng. This makes it possible to use a UV detector. The fabricated Fe 3 O 4 @SiO 2 nanoparticles incorporated poly(divinylbenzene) monolithic column has been shown to be very promising for gas chromatography separation. Graphical Abstract
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Wenjing Jiang,Linni Wu,Junling Duan,Huanshun Yin,Shiyun Ai
An ultrasensitive sandwiched electrochemiluminescence (ECL) immunosensor was developed for 5-hydroxymethylcytosine (5hmC) detection in genomic DNA by using Fe 3 O 4 @SiO 2 core–shell magnetic nanomaterial as a immobilization matrix for anti-5hmC antibody, PAMAM conjugated avidin and Ru(bpy) 2 (phen-5-NH 2 )(PF 6 ) 2 as signal amplification unit. Importantly, Fe 3 O 4 @SiO 2 nanoparticles were verified to not only possess enormous surface for loading antibody by amido link, but also exhibit excellent bioactivity . With the dual signal amplification strategy, the ECL immunosensor showed wide detection range from 0.1 to 30 nM with low detection limit of 0.047 nM (S/N = 3). Based on the specific immunoreaction, the developed method also illustrated excellent detection selectivity . The fabricated immunosensor was also applied to detect the 5hmC in genomic DNA of cancer tissue, which indicated that the immunosensor possess potential applications in clinical detection.
研究领域:
分析化学
·
生物化学
·
分子生物学
·
癌症研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yangyang Li,Jiaqian You,Huixin Lv,Chong Wang,Shaobo Zhai,Sicong Ren,Xiuyu Liu,Yidi Zhang,Yanmin Zhou
Currently, treating irregular bone defects with a critical size is still challenging as material implantation in the complex defects with irregular shapes, effective osteogenesis and sufficient vascularization cannot be easily achieved simultaneously via a simple strategy. Herein, a dual-responsive bone tissue engineering scaffold is developed using a 4D printing strategy by intergrating a single type of multifunctional magnetic nanoparticles, Fe 3 O 4 @SiO 2 , with printing inks made of bioceramics and biopolymers. Minimally invasive implantation, fluent navigation of scaffolds as well as the precise boundary matching between scaffolds and the irregular defects are achieved through near-infrared (NIR) irradiation-based temperature responsive shape recovery and static magnetic field (SMF) stimulation. Moreover, improved bone regeneration in critical-sized bone defects is successfully achieved through the activation of PI3K/AKT pathway which significantly promotes osteogenic differentiation and vascularization. Besides, NIR-based photothermal stimulation upregulates the expression of heat shock protein (HSP90) and further promotes the osteogenesis and vascularization. The in vivo study also confirms that our scaffold can precisely fit the bone defect, and induce satisfactory osteogenesis and angiogenesis. This work provides a facile strategy to simultaneously-realize easy scaffold implantation in irregular bone defects and improves osteogenesis and angiogenesis by integrating a single type of multifunctional nanoparticles with scaffold matrices.
研究领域:
组织工程
·
生物医学工程
·
材料科学
·
再生医学
✓ 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）