INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Dandan Wu,Yanqiao Zhang,Ming Wen,Hao Fang,Qingsheng Wu
To meet the requirement of high catalytic efficiency toward the reduction of p-nitrophenyl compounds, we designed a new one-dimensional Fe3O4/FeNi embedded-nanostructured catalyst synthesized by a one-pot controlling-growth-reduction process in a solvothermal system, in which Fe3O4 phase was implanted in the base of FeNi alloy. In the Fe3O4/FeNi catalyst system, the Fe3O4 embedded phase attracts the nitro group of p-nitrophenyl compounds by its high-density electrons, which can efficiently promote the activity of amorphous FeNi active centers for selective catalysis toward the reduction of a range of p-nitrophenyl compounds. Moreover, for the para-group in the nitrophenyl compounds, an increasing electron-donating power contributes to a higher catalytic activity, while electron-withdrawing power obtains the reverse case. Additionally, the Fe3O4/FeNi composite nanocatalyst exhibited an outstanding cycling performance over 20 times without obvious performance decay. This work opens an avenue to design more powerful non-noble metal catalysts for green chemistry.
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高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Shun Tang,Qian Lan,Jiyuan Liang,Shengrui Chen,Chang Liu,Jinxing Zhao,Qi Cheng,Yuan-Cheng Cao,Jiyan Liu
We report a facile method to synthesize polypyrrole-coated Fe 3 O 4 core-shell magnetic nanoparticles (Fe 3 O 4 @PPy). First, crude Fe 3 O 4 nanoparticles were synthesized by co-precipitation approach. PPy layers were generated and deposited on the surface of Fe 3 O 4 via in-situ electropolymerization and electrodeposition , to construct core-shell structure nanoparticles. TEM observations showed the Fe 3 O 4 nanoparticles changed from 15 nm to 120 nm in diameter after the PPy coating. The composition and morphology of Fe 3 O 4 @PPy nanoparticles were characterized by advanced spectroscopic and imaging techniques. The Fe 3 O 4 @PPy nanoparticles possess good dispersion property and acid stability in strong acid aqueous. The magnetic measurement at room temperature indicates that the Fe 3 O 4 @PPy nanoparticles exhibit superparamagnetic behavior, holding the saturation magnetization of 43.5 emu/g. All the results show great potentials of the Fe 3 O 4 @PPy nanoparticles in wide range of applications.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2016
·Vol. 122
·期 3
·1-6
·
IF 1.444
Yan Shaojiu,Wang Lina,Wang Tihong,Zhang Liqiang,Li Yongfeng,Dai Shenglong
We report a simple procedure to fabricate graphene oxide/carbon nanotube hybrids coated with cauliflower-like Fe 3 O 4 sphere. Characterizations have been carried out to investigate the morphology, crystalline structure of the composites by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. Fe 3 O 4 particles have the morphologies of multi-lacuna; moreover, some spheres are hollow. As a kind of potential microwave absorption material, the composites are lightweight and exhibit excellent microwave absorbing ability in the range of 2–16 GHz.
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Journal of the Taiwan Institute of Chemical Engineers
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2016
·
IF 2.848
Jia-liang Lv,Shang-ru Zhai,Yuan Fan,Zhi-min Lei,Qing-da An
There is an interesting but challenging task to develop a facile and cost-effective procedure for the making of multifunctional bio-adsorbents for environmental applications. Herein, low-temperature solution-carbonized rice husk (RH-c), β-cyclodextrins (β-CD) and Fe 3 O 4 were synergically combined to prepare a new kind of multifunctional bioadsorbent, i.e . RH-c/Fe 3 O 4 /CD, and applied for the adsorption of methylene blue (MB) from aqueous solution. The structure, morphology and magnetic properties were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), 13 C nuclear magnetic resonance spectra (NMR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM) techniques. Initial concentration of MB, contact time, pH effect, adsorption mechanisms and recycling test were also thoroughly investigated. The adsorption equilibrium data was best fitted by Langmuir isotherm model and the adsorption kinetics followed pseudo-second-order models for all samples. The maximum capacity predicted by the Langmuir model is 359.8 and 438.6 mg/g for RH-c/Fe 3 O 4 /CD and RH-c/CD2, respectively. The adsorption test suggested that resulting multifunctional RH-c/Fe 3 O 4 /CD is a promising bioadsorbent for dye molecules removal from aqueous system.
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CARBON
·
2015
·
IF 6.196
Xiangcun Li,Le Zhang,Gaohong He
Double-shelled hollow carbon spheres with multiporosity, highly conductive graphite structure and Fe 3 O 4 species was initially prepared (C–C–Fe 3 O 4 ). The seamless combination between the Fe 3 O 4 species and the porous carbon network leads to a remarkably high capacitivity (1153 F g −1 at 2 A g −1 ) and good rate capability (514 F g −1 at 100 A g −1 ) of pseudocapacitive. In addition, the C–C–Fe 3 O 4 assembled asymmetric supercapacitor demonstrates excellent cycling stability (96.7% retention of the initial capacitance after 8000 cycles) and achieves high energy density (17–45 W h kg −1 ) at powder density of 400–8000 W kg −1 . The unique porous carbon structure and seamlessly integration between carbon and Fe 3 O 4 species generate synergistic effect to boost high performance and ideal durability, and high conductivity of the graphitized carbon, the large specific surface area of the hierarchical pore network and the perfectly distributed Fe 3 O 4 redox species in the carbon content also account for its ideal capacitive properties. The multiporous structure could allow efficient diffusion of electrolyte and promote interfacial redox reactions of supercapacitor by facilitating the accessibility of redox active sites, and the highly uniform distribution of Fe 3 O 4 species in the porous carbon makes the best use of conductive carbon network and facilitates good rate capability.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-12
·
IF 5.228
Yin Ting,Huang Peng,Gao Guo,Shapter Joseph G.,Shen Yulan,Sun Rongjin,Yue Caixia,Zhang Chunlei,Liu Yanlei,Zhou Sui,Cui Daxiang
The development of targeted nanoprobes is a promising approach to cancer diagnostics and therapy. In the present work, a novel multifunctional photo/magnet-diagnostic nanoprobe (MNPs-PEG 2K -FA@Ce6) has been developed. This nanoprobe is built using folic acid (FA), bifunctional polyethylene glycol (PEG 2K ) and photosensitizer chlorin e6 (Ce6). The MNPs-PEG 2K -FA@Ce6 nanoprobes are superparamagnetic, can be synthesized on a large scale by a one-pot hydrothermal process without further surface modification and are stable in an aqueous environment for eight months. Compared with free Ce6 nanoprobes in vitro studies, the MNPs-PEG 2K -FA@Ce6 nanoprobes significantly enhance cellular uptake efficiency and promote the effectiveness of photodynamic therapy (PDT) with the assistance of 633 nm laser irradiation. The unique nanoprobes show superior penetration and a retention time of more than six days with less accumulation in the liver allowing highly effective tumor recognition and monitoring. Additionally, there was little damage to healthy organs or tissues. These exciting new nanoprobes could be potential building blocks to develop new clinical therapies and translational medicine.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 89
·85917-85923
·
IF 3.289
Yaqin Chen,Li Zheng,Yuanyuan Fu,Rihui Zhou,Yonghai Song,Shouhui Chen
Fe3O4/carbon (C) nanocomposites with octahedral structure have been successfully prepared as anode materials for lithium-ion batteries (LIBs) by carbonizing hexagonal dipyramid Fe–metal organic frameworks (MOFs) under N2 directly. The prepared Fe–MOFs and Fe3O4/C octahedral nanostructures were carefully characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray powder diffraction, thermogravimetric analysis, N2 adsorption/desorption isotherms and electrochemical techniques. The results showed that octahedral Fe3O4 was encapsulated by carbon layers to form porous Fe3O4/C octahedral nanostructures. Benefiting from the high electrical conductivity of the carbon matrix and the porous structure of Fe3O4/C nanocomposites, the Fe3O4/C octahedral nanostructures demonstrated a lithium storage capacity of 861 mA h g−1 after 100 cycles at a specific current of 100 mA g−1, as anode for lithium ion batteries (LIBs), which is much higher than that of spindle-like Fe2O3 obtained via direct carbonization of Fe–MOFs under an air atmosphere (merely 603 mA h g−1 under identical conditions) and commercial Fe3O4. The elaborate and well-defined configuration also delivered a high rate capability and long cycling stability. Hence, the combination of Fe3O4 crystals with an octahedral nanostructure and the random doping of carbon could offer a valid method for the development of anode materials for high-performance LIBs.
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CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jiaming Wu,Zhengmao Ye,Wenxiu Liu,Zhifang Liu,Juan Chen
Ideal electromagnetic absorbing materials with lightweight and high efficiency have broad application outlook in military and civil fields. In this work, a 3D nanostructure material by hybridizing Fe 3 O 4 nanocrystals and reduced graphene oxide (Fe 3 O 4 /rGO) were synthesized through an environmental-friendly one-pot solvothermal method. The effect of GO loading on electromagnetic (EM) wave absorption characteristic of Fe 3 O 4 /rGO was investigated. The introduction of rGO sheets not only prevented Fe 3 O 4 from agglomerating, also improved the absorption performance of Fe 3 O 4 /rGO hybrids. With an appropriate addition, Fe 3 O 4 /rGO obtained a minimum reflection loss (RL) of −22.7 dB and the absorption bandwidth was 3.13 GHz (90% absorption).
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 82
·期 2
·424-431
·
IF 1.575
Zhang Jing,Liu Mao,Liu Zhijie,Yang Tao,He Qiulai,Yang Kai,Wang Hongyu
Abstract This paper presents the synthesis of a novel core–shell covalently functionalized Fe 3 O 4 coated SiO 2 decorated graphene oxides (Fe 3 O 4 @SiO 2 –GO) adsorbent. The prepared Fe 3 O 4 @SiO 2 –GO was characterized by fourier transform infrared spectrum, X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), and magnetic measurements. And the adsorption properties of the Fe 3 O 4 @SiO 2 –GO toward malachite green were systematically investigated. Various factors possibly affecting the adsorption behavior (initial concentration, contact time, and adsorbent dosage) were also studied in detail. The adsorption capacity (q m ) of Fe 3 O 4 @SiO 2 –GO for malachite green was found to be 265.87 mg/g with best fit to Langmuir isotherm ( R
2 = 0.968), and the adsorption mechanism follows the pseudo-second-order model ( R
2 = 0.981). The results indicate that the Fe 3 O 4 @SiO 2 –GO adsorbent, which is easily separated via an external magnetic field, is a potential low-cost effective material for malachite green removal from contaminated water. Graphical Abstract
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ACS Applied Materials & Interfaces
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2017
·
IF 7.504
Peng Miao,Yuguo Tang,Lei Wang
Driven by the urgent need to detect trace heavy metal ions in various real water samples, this article demonstrates for the first time an electrochemical biosensor based on DNA modified Fe3O4@Au magnetic nanoparticles (NPs). Three DNA probes are designed to contain certain mismatched base pairs. One is thiolated and modified on the surface of Fe3O4@Au NPs (DNA 1). The other two probes (DNA 2 and 3) are labeled with two independent electrochemical species. Stable structures of cytosine–Ag+–cytosine and thymine–Hg2+–thymine formed in the presence of Ag+ and Hg2+ can assist the hybridization of DNA 1/DNA 2 and DNA 1/DNA 3, which locate corresponding electrochemical species onto the surface of the magnetic NPs. The achieved nanocomposites are then used as selective electrochemical probes for the detection of heavy metal ions by recording the square wave voltammetry signals. Simultaneous detection of Ag+ and Hg2+ is demonstrated without significant interference, and their individual high sensitivities are fundamentally preserved, which meet the requirements of U.S. Environmental Protection Agency (USEPA). Furthermore, the proposed method has been challenged by various real water samples. The results confirm the DNA modified magnetic NPs based sensing method may have potential applications for the monitoring of heavy metal ions in real sample analysis.
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RSC Advances
·
2016
·Vol. 6
·期 84
·81310-81317
·
IF 3.289
Yue Liu,Lu Li,Shiwei Liu,Congxia Xie,Shitao Yu
(3-Aminopropyl)-triethoxysilane (APTS) and (3-mercaptopropyl)-trimethoxysilane (MPTS) grafted SiO2-coated iron oxide (Fe3O4@SiO2) magnetic supports were prepared. Various noble metal nanoparticles such as Ru, Pt, Rh and Pd were directly grown on the surfaces of the magnetic supports with ultrasmall and nearly monodisperse sizes, especially the APTS grafted Fe3O4@SiO2 (Fe3O4@SiO2/APTS) nanospheres. The Fe3O4@SiO2/APTS/Ru catalyst demonstrated a high catalytic activity towards the hydrogenation of α-pinene to form cis-pinane. The conversion of α-pinene was 99.1% and the selectivity for cis-pinane reached 97.6% at 120 °C after 4 h. The Fe3O4@SiO2/APTS/Ru catalyst was easily separated from the reaction mixture when applying an external magnetic field, and the separated Fe3O4@SiO2/APTS/Ru had good reusability. After being reused eight times, the α-pinene conversion and the cis-pinane selectivity also can reach 97.8% and 96.9%, respectively.
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高影响因子
Oncotarget
·
2017
·
IF 5.168
Fuquan Yuan,Gang Zhao,Fazil Panhwar
Cryosurgery is a minimally invasive treatment that utilize extreme low temperatures to destroy abnormal tissues. The clinical monitoring methods for cryosurgery are almost based on the visualization of the iceball. However, for a normal cryosurgery process, the effective killing region is always smaller than the iceball. As a result, the end of the cryosurgery process can only be judged by the surgeons according to their experience. The subjective judgement is one of the main reasons for poor estimation of tumor ablation, and it sparks high probability of recurrence and metastasis associate with cryosurgery. Being different from the previous optimization studies, we develop a novel approach with the aid of nanoparticles to enlarge the effective killing region of entire iceball, and thus it greatly decrease the difficulty of precise judgement of the cryosurgery only by applying the common clinical imaging methods. To verify this approach, both the experiments on a tissue-scale phantom with embedded living HepG2 cells in agarose and on a cell-scale cryo-microscopic freeze-thaw stage are performed. The results indicate that the introduction of the self-synthesized Fe 3 O 4 nanoparticles significantly improved cell killing in the cryosurgery and the range of killing is extended to the entire iceball. The potential mechanism is further revealed by the cryo-microscopic experiments, which verifies the presence of Fe 3 O 4 nanoparticles can significantly enhance the probability of intracellular ice formation and the cell dehydration during freezing hence it promote precise killing of the cells. These findings may further promote the widespread clinical application of modern cryosurgery.
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高影响因子
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