Journal of Materials Chemistry A
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2016
·Vol. 4
·期 37
·14392-14399
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IF 8.262
HaiPeng Bai,YaPing Zheng,TianYu Wang,NingKun Peng
A magnetic, solvent-free nanofluid with a core–corona–canopy structure based on Fe3O4/polyaniline is synthesized for the first time. The solvent-free nanofluid has magnetic properties owing to the Fe3O4 core, flow ability because of the flexible chain canopy, and conductivity due to the conductive polyaniline corona and Fe3O4 core. The canopy structure possesses a nanofluid fraction of 87.7 wt%, which is high enough for it to act as the continuous phase and thus warrant fluidity. The liquid property is verified by rheological test. The percentage of crystallinity of the solvent-free nanofluid is 43%. The electric conductivity of the solvent-free nanofluid changes with temperature. The conductivity of the aqueous solution of the nanofluid can be adjusted by changing the strength or direction of the magnetic field. The fabricated solvent-free nanofluid has wide potential for application; for example, its CO2 capture capacity can reach 3.1 mmol g−1. With magnetic responsiveness, the Fe3O4/polyaniline nanofluid aqueous solution can be used in magnetic field detection.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2017
·Vol. 5
·期 2
·487-496
·
IF 6.047
Changqing Zhu,Fuqiang Liu,Li Song,Hao Jiang,Aimin Li
Magnetic core–shell Fe3O4@polyanilines (Fe3O4@PANI) were controllably synthesized to harvest microwave (MW) energy for ultrafast Cr(VI) reduction. The nanocomposites are excellent MW acceptors due to the combination of the magnetic loss of Fe3O4 and dielectric loss of PANI. Under MW irradiation, abundant hot spots are generated on Fe3O4@PANI to accelerate the reduction of surface-bound Cr(VI). Moreover, Fe3O4@PANI is highly stable in an acidic solution and readily recoverable with an external magnet after use. The PANI shell possesses good enrichment ability for Cr(VI), creating a high Cr(VI) surface concentration which benefits the sequential reduction. Furthermore, an increase in the PANI coating amount from 24.78% to 55.15% increases the Cr(VI) adsorption capacity (qe) from 0.63 mmol g−1 to 1.68 mmol g−1, which linearly enhances the removal rate constant (k) of Cr(VI) under an MW field as k = 0.30qe − 0.03. The addition of oxalic acid as a sacrificial electron donor increases the Cr(VI) removal rate by 120.09% and protects the PANI shell from excessive oxidation by Cr(VI); this prolongs the lifetime of Fe3O4@PANI. In the presence of oxalic acid, the MW-driven Cr(VI) reduction on Fe3O4@PANI proceeds at a rate constant of 0.5773 min−1, which is much higher than that of palladium-based chemocatalysis. Moreover, Fe3O4@PANI can be in situ regenerated by MW and directly reused in the next cycle, and no efficiency loss occurs in 5 continuous runs. The mechanism study based on Cr species tracking and solid analyses indicates that a synergistic adsorption and reduction cycle proceed consecutively, contributing to the rapid Cr(VI) removal. This study demonstrates that Fe3O4@PANI is a promising alternative to utilize MW for ultrafast Cr(VI) reduction and has the advantages of time-saving and energy efficiency.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2024
·
IF 1.3
Bin Li,Pingxia Wang
Dexamethasone, a potent synthetic glucocorticoid, is widely used for its anti-inflammatory and immunosuppressive properties. However, its misuse as a performance-enhancing drug in sports has raised concerns among regulatory authorities. To address this issue, an electrochemical sensor based on Fe 3 O 4 /polyaniline (PANI)-Cu(II) microspheres and hematite nanoparticles was developed for the sensitive and selective detection of dexamethasone. The sensor exhibited excellent electrocatalytic activity towards the oxidation of dexamethasone due to the synergistic effect of the high conductivity and large surface area of the Fe 3 O 4 /PANI composite microspheres, the electrocatalytic properties of the loaded copper(II) ions, and the enhanced electron transfer of the hematite nanoparticles. Under optimized conditions, the sensor showed a wide linear range of 0.05–50 μM, with a detection limit of 0.015 μM. The sensor also demonstrated good selectivity, reproducibility (RSD = 3.2 %, n = 5), and long-term stability (92 % retention after 4 weeks). Furthermore, the sensor was successfully applied for the determination of dexamethasone in spiked human serum and urine samples, with recoveries ranging from 97.5 % to 103.5 % and RSDs less than 3.5 %.
研究领域:
分析化学
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药物分析
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 14
·4332-4338
·
IF 5.368
Feng Wang,Liyan Huang,Jun Li,Lina Lin,Zhengping Liu,Zhaoxia Dong
Well-defined superparamagnetic and conductive Fe3O4/polyaniline (PANI) hollow spheres were fabricated using positively charged polystyrene (PS) spheres as templates. The negatively charged Fe3O4 particles, which were decorated by citric acid, can be attached onto the surface of the PS spheres via electrostatic interaction. Subsequently, the PANI layer was coated onto the PS/Fe3O4 templates by in situ chemical oxidative polymerization. Finally, removal of the PS core by dissolving with tetrahydrofuran provided the electromagnetic hollow spheres. Morphologies and compositions of Fe3O4/PANI hollow spheres were investigated by using SEM, TEM, FTIR and XRD. Magnetic analysis demonstrates that the synthesized composite spheres possess the characteristic of superparamagnetism and the saturation magnetization value is 26.2 emu g−1. Batch adsorption shows that the Fe3O4/PANI hollow spheres exhibit high uptake property of Pb2+ in aqueous solution. The adsorption kinetics follows the mechanism of pseudo-second-order kinetics and the sorption agrees well with the Langmuir isotherm.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Tingting Wen,Wanying Zhu,Cheng Xue,Jinhua Wu,Qing Han,Xi Wang,Xuemin Zhou,Huijun Jiang
A novel electrochemical sensing platform based on magnetic field-induced self-assembly of Fe 3 O 4 @Polyaniline nanoparticles (Fe 3 O 4 @PANI NPs) has been for the first time fabricated for the sensitive detection of creatinine in biological fluids. The template molecule, creatinine, was self-assembled on the surface of Fe 3 O 4 @PANI NPs together with the functional monomer aniline by the formation of N–H hydrogen bonds . After pre-assembled, through the magnetic-induction of the magnetic glassy carbon electrode (MGCE), the ordered structure of molecularly imprinted polymers (MIPs) were established by the electropolymerization and assembled on the surface of MGCE with the help of magnetic fields by a simple one-step approach. The structural controllability of the MIPs film established by magnetic field-induced self-assembly was further studied. The stable and hydrophilic Fe 3 O 4 @PANI can not only provide available functionalized sites with which the template molecule creatinine can form hydrogen bond by the abundant amino groups in PANI matrix, but also afford a promoting pathway for electron transfer . The as-prepared molecularly imprinted electrochemical sensor (MIES) shows good stability and reproducibility for the determination of creatinine with the detection limit reached 0.35 nmol L −1 (S/N=3). In addition, the highly sensitive and selective MIES has been successfully used for the clinical determination of creatinine in human plasma and urine samples. The average recoveries were 90.8–104.9% with RSD lower than 2.7%.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO
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2020
·
IF 1.566
Wentong Yang,Xiansen Yang,Xiang Li,Md. Zahidul Islam,Yubing Dong,Yaqin Fu,Xiangdong Liu,Feiya Fu,Yaofeng Zhu
In this paper, we designed a core@double-shell nanostructure to enhance the electromagnetic wave absorption performance of hybrid nanospheres. Herein, the core@double-shell structured Fe 3 O 4 @polyaniline@MnO 2 nanospheres were successfully prepared by a facile solvothermal process and in situ polymerization methods. The morphology, structure, magnetism and microwave absorption properties were studied. The results reveal that the FPM nanospheres exhibit extraordinary microwave absorbing performance compared to those of either Fe 3 O 4 or Fe 3 O 4 @polyaniline nanospheres. The minimum reflection loss of the FPM nanospheres is − 14.7 dB at 15.76 GHz with the thickness of 3.5 mm, and the corresponding effective absorption bandwidth can reach 4.75 GHz. The perfect EMW absorption of nanospheres can be ascribed to multi-interface polarization, multiple reflections and good impedance matching originated from the core@double-shell nanostructure.
研究领域:
材料科学
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纳米技术
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电磁工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）