NANOTECHNOLOGY
·
2018
·Vol. 29
·期 29
·295603
·
IF 3.404
Huanqin Zhao,Yan Cheng,Wei Liu,Zhihong Yang,Baoshan Zhang,Guangbin Ji,Youwei Du
Special electric and magnetic characteristics make Fe3O4 widely applied in the electromagnetic (EM) wave absorption region. However, for pure Fe3O4, it is still a challenge to simultaneously obtain high absorption intensity and broadband absorption at a low thickness, owing to its low dielectric property. As we realized, flake configuration and the porous structure have obviously promote the EM wave absorption property. Because the former can lead to multi-reflection between flakes and the latter is conductive to interface polarization, flaky Fe3O4 with a porous and coarse surface was designed to overcome the deficiency of traditional Fe3O4 particles. The experimental results demonstrate that the flaky configuration is conductive to enhancing the dielectric coefficient and optimizing impedance matching. Moreover, the complex permittivity rises with the aspect ratio of the sheet. Under a suitable dimension, the flaky Fe3O4 could acquire targeted EM wave absorption capacity in the X band (8–12 GHz). In detail, the maximum reflection loss (RL) could reach a strong intensity of −49 dB at 2.05 mm. The effective absorption bandwidth (EAB) with RL below −10 dB is 4.32 (7.52–11.84) GHz, which is almost equivalent to the whole X band (8–12 GHz). Even more exciting, when regulating the thickness between 2.05 and 3.05 mm, the EAB could cover the entire C and X bands (4–12 GHz). This study provides a good reference for the future development of other ferromagnetic materials toward specific microwave bands.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 40
·405101
·
IF 3.44
Qi Zhang,Jian Liu,Kunjie Yuan,Zhengguo Zhang,Xiaowen Zhang,Xiaoming Fang
Herein a novel multi-controlled drug release system for doxorubicin (DOX) was developed, in which monodisperse mesoporous Fe3O4 nanoparticles were combined with a phase change material (PCM) and polyethylene glycol 2000 (PEG2000). It is found that the PCM/PEG/DOX mixture containing 20% PEG could be dissolved into water at 42 °C. The mesoporous Fe3O4 nanoparticles prepared by the solvothermal method had sizes of around 25 nm and exhibited a mesoporous microstructure. A simple solvent evaporation process was employed to load the PCM/PEG/DOX mixture on the mesoporous Fe3O4 nanoparticles completely. In the Fe3O4@PCM/PEG/DOX system, the pores of the Fe3O4 nanoparticles were observed to be filled with the mixture of PCM/PEG/DOX. The Fe3O4@PCM/PEG/DOX system showed a saturation magnetization value of 50.0 emu g−1, lower than 71.1 emu g−1 of the mesoporous Fe3O4 nanoparticles, but it was still high enough for magnetic targeting and hyperthermia application. The evaluation on drug release performance indicated that the Fe3O4@PCM/PEG/DOX system achieved nearly zero release of DOX in vitro in body temperature, while around 80% of DOX could be released within 1.5 h at the therapeutic threshold of 42 °C or under the NIR laser irradiation for about 4 h. And a very rapid release of DOX was achieved by this system when applying an alternating magnetic field. By comparing the systems with and without PEG2000, it is revealed that the presence of PEG2000 makes DOX easy to be released from 1-tetradecanol to water, owing to its functions of increasing the solubility of DOX in 1-tetradecanol as well as decreasing the surface tension between water and 1-tetradecanol. The novel drug release system shows great potential for the development of thermo-chemotherapy of cancer treatment.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xueying Li,Yalin Xu,Hui Wu,Xiu Qian,Lizhuang Chen,Yuanyuan Dan,Qing Yu
The porous Fe 3 O 4 nanoaggregates were fabricated by the carbon polyhedron as templates through the hydrothermal method . The carbon polyhedron was obtained by the carbonization of ZIF-67 and subsequent acid treatment. The finial porous Fe 3 O 4 nanoaggregates possess high specific area of 547.5 m 2 g −1 with pore volume of 0.375 cm 3 g −1 . Such unique structures facilitate electrode materials fully exposed to electrolyte solution and maintain the structural stability during fast electrochemical reaction processes. Thereby, porous Fe 3 O 4 nanoaggregates exhibit high specific capacity of 868.7 C g −1 at 2 A g −1 in the wide potential window of −0.90 - 0.45 V in 3 M KOH. After 3000 cycles at 2 A g −1 , the electrode material retains 771.8 C g −1 . Even at high current density of 20 A g −1 , the electrode still delivers 456.1 C g −1 , which is outstanding of other Fe 3 O 4 nanomaterial for supercapacitor . Furthermore, the Fe 3 O 4 //AC asymmetry supercapacitor (3 M KOH as electrolyte) exhibits high energy density of 24.2 Wh kg −1 at power density of 801.1 W kg −1 with excellent cycling performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT
·
2014
·
IF 1.526
Yixin Liu,Wenjuan Zhu,Dan Wu,Qin Wei
Amino-group functionalized mesoporous Fe 3 O 4 nanoparticles were prepared by a simple solvothermal method. Palladium (Pd)-loaded amino-group functionalized mesoporous Fe 3 O 4 nanoparticles (Pd@Fe 3 O 4 ) were prepared with ethanol as the reductant. Pd@Fe 3 O 4 modified the glassy carbon electrode (GCE) exhibited excellent electrochemical catalytic activities towards dopamine (DA) due to the synergetic effect between Pd and Fe 3 O 4 . Electrochemical behavior of Pd@Fe 3 O 4 /GCE towards DA was studied using square wave voltammetry and the selective determination of DA was carried out successfully at high concentration of uric acid. A wide concentration range (0.96–107 μmol/L) and low detection limit (0.41 μmol/L, S/N = 3) for the determination of DA were obtained. The advantageous properties of this electrode for the DA determination lie in its excellent catalytic activity, selectivity and simplicity. The prepared sensor had been applied to the analysis of DA in human serum samples with satisfactory results.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yarong Huang,Yongzhao Zhang,Dandan Liu,Menggang Li,Yongsheng Yu,Weiwei Yang,Haibo Li
Dopamine (DA) detection is significant for the prevention of unfavorable neuronal illness. However, the detection of DA with low concentration still face tremendous challenges. In this study, highly ordered mesoporous Fe 3 O 4 materials were synthesized as a biosensor by using mesoporous silica KIT-6 with different aging temperature as hard template. The ordered mesoporous Fe 3 O 4 with high surface area modified glassy carbon electrode shows the high sensitivity for detecting DA. Fe 3 O 4 -40 mesoporous material modified electrode has the highest catalytic activity to DA with a sensitivity of 0.053 nA nM −1 and a detection limit of 0.8 nM (S/N = 3). The results indicating that the mesoporous Fe 3 O 4 material modified electrode exhibits high sensitivity to determine DA at low levels, which can be used for DA real-time monitoring in neutral biological media.
研究领域:
生物传感
·
材料科学
·
神经生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Hao Ying,Tingting Chen,Chenyun Zhang,Jiahui Bi,Zhonghao Li,Jingcheng Hao
The production of ammonia through electrocatalytic nitrogen reduction reaction (NRR) is environmentally friendly and energy-saving, but it still suffers from the low NH 3 yield rate and poor selectivity. Herein, enlightened by the unique solubility of Fe 3 O 4 in deep eutectic solvent (DES), we, for the first time, reported a DES-based regeneration strategy to fabricate porous Fe 3 O 4 nanosheets utilizing commercial Fe 3 O 4 powder as raw materials. The as-regenerated porous Fe 3 O 4 nanosheets exhibited satisfactory electrocatalytic performance toward NRR, affording a NH 3 yield rate of 12.09 μg h −1 mg −1 cat along with an outstanding Faradaic efficiency (FE) of 34.38% at −0.1 V versus reversible hydrogen electrode (RHE), in the 0.1 M Na 2 SO 4 electrolyte. The superior electrocatalytic activity of the as-regenerated Fe 3 O 4 nanosheets mainly resulted from their unique sheet-like morphology with large active surface area, high porosity, and abundant oxygen vacancies. Our proposed DES-based regeneration strategy opens a new avenue for the construction of high-performance electrocatalyst from commercial raw materials, holding great promise in NRR.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2023
·
IF 4.7
Xueqi Yin,Guoke Wei,Aijun Gong,Xianglin Zhou
This paper focuses on the effect of the porosity of Fe3O4 on electromagnetic wave (EMW) loss. The pore structures were based on the Voronoi method by MATLAB, and the electromagnetic fields were constructed based on COMSOL Multiphysics. The energy loss of EMWs with frequencies of 2–18 GHz through Fe3O4 nanoparticles with different porosities was simulated and analyzed. Well-defined porous Fe3O4 nanostructures were synthesized by heating FeCl3·6H2O, urea, and surfactant (TBAB) in an ethylene glycol solution. Then, the prepared samples were eroded with oxalic acid to obtain different porosities. The electromagnetic parameters of the experimental samples were tested to validate the simulation results. The results showed that increasing the porosity, to some extent, was beneficial to the impedance matching characteristics, thus improving the EMW loss. The simulation results with different porosities and the experimental results with varying pore volumes had some consistency. When the porosity of the digital model was 30.63% and the pore volume of the experimental samples was 0.3102 cm3/g, |Zin/Z0| was the closest to 1, indicating that the impedance matching was the best. At the same time, it was found that the pore volume of the material can be used to characterize the porosity during the experimental preparation, thus simplifying the data processing.
研究领域:
材料科学
·
电磁学
·
纳米技术
·
模拟与建模
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yang Liu,Zhuo Chen,Wenhan Xie,Shaokun Song,Yang Zhang,Lijie Dong
Biomass waste has emerged as a novel sustainable and renewable material for fabricating functional materials because of the lightweight and easy manufacturing. Herein, we synthesize a porous Fe3O4/carbon fiber (Fe3O4/CF) composites derived from bagasse waste by in-situ growth and a graphitization process. The Fe3O4 nanocrystals uniformly embedded in porous CF significantly construct the multiple interfaces and hierarchical microstructure of Fe3O4/CF composites. Fe3O4/CF composites exhibit a maximum reflection loss value of −48.2 dB at 15.6 GHz with a thin thickness of only 1.9 mm. Meanwhile, a broad effective absorption bandwidth of 5.1 GHz covering the frequency range of 12.9–18.0 GHz is achieved. The rough surface, porous structure, and proper component contribute to the improved impedance matching. Meanwhile, the Debye relaxation and interfacial polarization dominantly promote the attenuation ability of the microwave. The enhancement of attenuation ability and impedance matching together account for the superior microwave absorption performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）