SYNTHETIC METALS
·
2023
·
IF 4.4
Yongli Meng,Yin Liu,Chong Yang,Ling Bing Kong
Nickel ferrite/coal-based carbon (NiFe 2 O 4 /CBC) composites were synthesized by using microwave irradiation and simple hydrothermal method . The effects of reaction conditions on particle size, morphology, magnetic, and microwave absorption properties of the NiFe 2 O 4 /CBC composites were systematically studied. In all NiFe 2 O 4 /CBC composites, NiFe 2 O 4 microspheres with different shapes and sizes were anchored on the surface of CBC. By adjusting size of the NiFe 2 O 4 particles, dielectric and magnetic properties of the NiFe 2 O 4 /CBC composites could be optimized simultaneously. For the NiFe 2 O 4 /CBC sample with the average particle size of NiFe 2 O 4 to be 4.69 nm, when the thickness was 4.42 mm, the minimum reflection loss (RL min ) could reach − 63.15 dB at 9.89 GHz. Meanwhile, the maximum effective absorption bandwidth (EAB max ) was 4.91 GHz (6.31–11.22 GHz) at a thickness of 5 mm, which almost covered the whole X-band. The s-shaped hysteresis loop of the sample revealed that it had typical superparamagnetic characteristics. The possible mechanism of microwave absorption was also discussed. Our NiFe 2 O 4 /CBC composites could be used as a new and efficient microwave absorption material.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaoxiao Dong,Chang Lu,Shuaijie Guo,Siqi Zhang,Xuelian Hu,Wenliu Wang,Yiwei Tang,Shuo Wang,Xiuying Liu
A magnetic NiFe 2 O 4 @TiO 2 @Au composite was successfully synthesized via layer-by-layer assembly approach and exhibited excellent SERS performance. The composite was functionalized with an aptamer modified with Cy3, serving as the Raman signal reporter, and was hybridized with complementary DNA oligonucleotides (cDNA) to construct the NiFe 2 O 4 @TiO 2 @Au@ssDNA SERS aptasensor. This aptasensor enabled the development of a sensitive, specific, and straightforward SERS assay for acetamiprid detection, exhibiting good accuracy. Under optimized conditions, an inverse correlation was established between the acetamiprid concentration and the Raman intensity at the characteristic peak of 1132 cm −1 , spanning a range of 10 −1 -10 4 nmol/L with a LOD of 8.4 × 10 −1 pmol/L. Standard addition experiments to three types of leafy vegetables samples yielded recoveries ranging from 94.30 % to 111.83 %, with a relative standard deviation of <5.56 %. This method shows potential for detecting other hazardous substances in food and environmental samples by simply changing the corresponding aptamers and cDNA.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2024
·
IF 3.4
Zhan Tian,He Wang,Guoqiang Li,Hongrui Jia,Guoxin Zhang
NiFe 2 O 4 has emerged as an efficient oxygen evolution reaction (OER) electrocatalyst, with outstanding stability in alkaline media and excellent redox properties. In order to further improve the catalytic performance, thinly-walled NiFe 2 O 4 nanotubes (NiFe 2 O 4 -NTs), efficiently derivable from Ni, Fe, N-codoped carbon nanofibers, were innovatively synthesized through a sequential route combing hydrothermal, electrospinning, and high-temperature sintering in this work. The NiFe 2 O 4 -NTs possess large diameter of around 120 nm and their thickness of the tube wall is only about 10 nm. The surface properties of NiFe 2 O 4 can be adjusted by forming the Ni-N/Fe-N bonds. Excitingly, largely exposed active surface area and boosted catalytic reaction kinetics toward oxygen evolution reaction are realized. The required overpotential to deliver 10 mA cm −2 is only 331 mV, accompanied with favorable Tafel slope of only 51.8 mV dec −1 , small charge transfer resistance, and superior reaction stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 16
·3366-3379
·
IF 3.089
Wu Chenyan,Huang Feilong,Shen Qianhong,Yu LiXin,Zhang Changteng,Sheng Jiansong,Cheng Di,Yang Hui
Abstract The magnetic photocatalysts play an important role in practical application. Herein, a novel magnetic hierarchical Z-scheme NiFe 2 O 4 @Bi 2 Sn 2 O 7 heterojunction photocatalyst was fabricated by hydrothermal strategy. The structure, micromorphology and physical properties of the as-prepared products were analysed, and the photocatalytic performance was carried out via photocatalytic degradation of tetracycline hydrochloride under visible-light irradiation. The longest average carrier lifetime of the NiFe 2 O 4 @Bi 2 Sn 2 O 7 composite is about 2.9 times longer than that of pure Bi 2 Sn 2 O 7 (2.45 ns), thereby achieving the enhanced photocatalytic activity. After a four-cycle photocatalytic degradation reaction, the NiFe 2 O 4 @Bi 2 Sn 2 O 7 composite still exhibits excellent photocatalytic activity and structural stability due to its magnetic property, and this feature is conducive to its practical application. The results demonstrate that NiFe 2 O 4 nanoparticles are uniformly loaded on flower-like hierarchical Bi 2 Sn 2 O 7 , and thus not only forming nanosized Z-scheme NiFe 2 O 4 @Bi 2 Sn 2 O 7 heterostructure, but also making the composite material magnetic. This work provided new perspectives about construction of heterojunction photocatalysts. Graphic Abstract
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 8
·2327-2339
·
IF 3.679
Caimei Zhao,Lei Chen,Chuanming Yu,Binghua Hu,Haoxuan Huang,Yongjie Chen,Xin Wang,Yongshi Ye,Xiaohui Zhuang,Yong Li
Super-hydrophobic porous absorbents are convenient, low-cost, efficient and environment-friendly materials in the treatment of oil spills. In this work, a simple Pickering emulsion template method was employed to fabricate an interconnected porous poly(DVB–LMA) sponge. A new co-Pickering stabilization system of Span 80 and NiFe2O4 nanoparticles was used to prepare ultra-concentrated internal phase water-in-oil (W/O) emulsions. After further polymerization, the resulting sponges were generated, which exhibited excellent adsorption selectivity due to the super-hydrophobicity and super-lipophilicity. Furthermore, the characterization results indicated that the composites had superior thermal stability, low density, high porosity and a flexible three-dimensional porous structure. Besides, the addition of nickel ferrite nanoparticles provided the materials with extra magnetic operability. High oil adsorption capacity (up to 36.9–84.2 g g−1), high oil retention, fast adsorption rate and superior reusability allowed the materials to be applied in the treatment of oily water.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 6
·
IF 2.7
Yu Qi,Tang Yiming,Nie Weicheng,Du Chenglong,Wang Yunlong
The graphene-based electromagnetic wave absorption materials have attracted extensive attention due to their lightweight, strong absorption, broadband, and thin thickness. In this work, graphene hollow microspheres anchored with FeNi-coupled nanocrystal (GHMs@FeNi 3 /NiFe 2 O 4 ) were synthesized using water-in-oil (W/O) emulsification and high-temperature calcination. The GHMs@FeNi 3 /NiFe 2 O 4 microspheres have a homogeneous spherical morphology and a pronounced hollow structure, and the FeNi-coupled nanocrystals are homogeneously embedded in a spongy shell assembled by rGO nanosheets. Owing to the optimized impedance matching and enhanced attenuation, the GHMs@FeNi 3 /NiFe 2 O 4 composites exhibit outstanding microwave absorption ability, particularly in the Ku band. The minimum reflection loss (RL min ) value can reach −58.96 dB at 14.43 GHz with a matching thickness of 2.25 mm, and the effective absorption bandwidth (lower than −10 dB) is up to 6.29 GHz (11.71–18 GHz) covering the whole Ku band. We believe that our work provides an idea for the design of high-performance absorbing composite materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xixi Ji,Yao Wan,Dan Xu,Xiaotong Pang,Yonggang Tong,Jingzhong Fang,Wei Xie,Yuanqiang Luo,Yaqi Ren,Yongle Hu
According to the escalating concern regarding the health hazards associated with electromagnetic radiation , the significance of absorbing materials underscores which could mitigate the healthy risks. While magnetic materials offer excellent absorption performance, their high density poses challenges to achieving optimal absorption efficiency. Conversely, carbon-based materials are known for their lightweight and versatile but face impedance matching issues. To address these obstacles, carbon/magnetic composite materials have been explored. However, their absorption performance has not fully met requirements due to weaker magnetic properties and increased density. Herein, we synthesized a porous carbon material embedded with magnetic FeNi/NiFe 2 O 4 and dielectric SiO 2 nanoparticles (FeNi-NiFe 2 O 4 -SiO 2 @PC) using carbonthermal method. By adjusting the ratio of polyvinylpyrrolidone to nitrates, the electromagnetic wave (EMW) absorption performance is adjusted. The FeNi-NiFe 2 O 4 -SiO 2 @PC composites display remarkable EMW absorption properties, achieving a minimum reflection loss of −69.9 dB at a thin thickness of 1.495 mm and a maximum effective absorption bandwidth of 5.68 GHz, covering the range from 12.32 to 18.0 GHz at a thickness of 1.92 mm. This outstanding performance can be attributed to the favorable impedance matching and the three-dimensional porous structure, which facilitates a 3D transmission network for multiple reflections. Additionally, the presence of FeNi, NiFe 2 O 4 , and SiO 2 nanoparticles enhances magnetic loss, conductive loss, interface polarization, and dipolar polarization, leading to excellent ab. Hence, this work offers insights into the composition design of high-performance absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2024
·Vol. 150
·期 6
·04024020
·
IF 1.6
Dawei Wang,Tingyue Chen,Yilan Jiang,Xinyang Cai,Yingying Li,Yuanyuan Chen,Guang Yang,Feng Pan
Promoting the Fe(II)/Fe(III) cycle efficiency is of wide interest for the broader applications of the Fenton process in water treatment sector. In this study, the alternating magnetic field (AMF) was employed to accelerate the reduction from Fe(III) to Fe(II). To achieve this purpose, a composite of nano-zero valence iron and NiFe2O4 was fabricated (denoted as Fe@NiFe2O4). Under the optimal reaction conditions, bisphenol A (BPA) was removed completely within 15 min by the Fe@NiFe2O4/H2O2 system in the presence of AMF, while only ∼60% was removed in the absence of AMF. The faster removal rate in the presence of AMF was ascribed to the elevated temperature caused by the inductive heating of Fe@NiFe2O4 (∼41°C according to the simulation). The simulator of the Fenton process was considered to be the leaked Fe(II) from the Fe part of the composite, as an equal concentration of Fe(II) (∼5.7 mg/L) resulted into a similar removal kinetic. However, the system with Fe@NiFe2O4 as the catalyst consumed less H2O2 in this process, indicating its different activation pathway from the conventional Fenton process. Electrochemical analysis confirmed that the AMF can generate the internal electric field within the composite particle. This field may facilitate the reduction from Fe(III) to Fe(II), which further benefitted the Fenton reactions.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Beili Pang,Meili Zhang,Cheng Zhou,Hongzhou Dong,Shuai Ma,Jianguang Feng,Yingjie Chen,Liyan Yu,Lifeng Dong
The development of low cost electrocatalysts with excellent I − /I 3 − redox reaction efficiency is critically important for practical applications of dye-sensitized solar cells (DSSCs). Nevertheless, it is difficult to simultaneously improve the activity and stability of catalysts. Herein, heterogeneous FeNi 3 /NiFe 2 O 4 nanoparticles are successfully embedded in modified graphene (mGr) matrix with network structure. As-prepared FeNi 3 /NiFe 2 O 4 @mGr shows excellent electrocatalytic activities and high stability. The DSSCs with FeNi 3 /NiFe 2 O 4 @mGr as counter electrodes demonstrate a high power conversion efficiency of 12.14%, which is superior to that of platinum (Pt, 8.31%). Also, the FeNi 3 /NiFe 2 O 4 @mGr device remains 90% efficiency up to 42 days under ambient conditions without encapsulation. Therefore, the FeNi 3 /NiFe 2 O 4 @mGr composite can be further developed as an environmentally friendly, inexpensive, and efficient counter electrode material for DSSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Songlin Zhao,Changhua Ge,Zhenzhong Yan,Jie Zhang,Shibin Ren,Huading Liang,Fushan Chen,Xiaonian Li
A NiFe 2 O 4 and reduced graphene oxide (RGO) composite has been synthesized by one-pot microwave-assisted combustion method, characterized and tests for thiophenes capture from model diesels. The composite exhibits excellent performance for adsorption desulfurization. When 100 mg-S/Kg of thiophenes in n-octane used as model fuel, the maximal adsorption capacities are about 1.05 mmol-S/g (which are 3–4 times higher than that of RGO) and less affected by the competitive adsorption of the added p -xylene. The adsorption kinetics and the equilibrium isotherm data for all species over the composite are well compliant with the pseudo-second order model and the Freundlich model, respectively. Additionally, the composite could be easily separated by external magnetic field. The regeneration of the composite by solvent extraction afforded 89-80% of the initial adsorption capacities after the first three regeneration cycles.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wangchang Li,Xiang Zhou,Yue Kang,Ting Zou,Wanjia Li,Yao Ying,Jing Yu,Jingwu Zheng,Liang Qiao,Juan Li,Shenglei Che
Novel FeSiAl soft magnetic composites (SMCs) with a phosphate insulation coating doped with magnetic NiFe2O4 nanocrystalline particles were prepared. They exhibited high permeability, ultra-low loss, and high thermal stability. The saturation magnetization of the FeSiAl SMC increased, while the coercivity decreased due to the exchange coupling of the magnetic nanocrystalline particles. The total loss of the novel SMC decreased to 139.93 kW/m3 at 100 mT and 100 kHz, which is only one-third of that of common commercially available Sendust composites, while the permeability was up to 62 for the reduced demagnetization field. Furthermore, three-dimensional loss separation was performed based on the nonlinear regression method, and the complex permeability was separately addressed as the domain-wall movement and spin resonance parts. The minimum total loss was ascribed to the significantly reduced hysteresis loss and the slightly reduced eddy current loss, corresponding to the low coercivity (Hc = 0.341 Oe) and high impedance (|Z| = 67.1 MΩ). This was attributed to the improved magnetic properties and resistance of the insulation coating, which was related to the magnetic nanoparticles embedded in the insulation coating. The permeability was mainly derived from the spin resonance due to the complete insulation coating and ultrafine particles. This novel SMC with a phosphate insulation coating doped with magnetic NiFe 2 O 4 nanocrystalline particles provides a high-efficiency, high-frequency, and high-saturation soft magnetic device for switching power supplies, photovoltaic inverter boost inductors, and other applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Shuping Zhang,Yizhe Shang,Jiaxing Wang,He Chen,Yuanquan Xiong,Huiyan Zhang
Biofuels or chemicals from biomass resources is a perfect substitute for fossil resources to achieve carbon neutrality. Gasification is an important approach to realize the high-value utilization of biomass, but tar is the bottleneck problem. Herein, a char-supported NiFe-NiFe 2 O 4 catalyst was constructed to accomplish the efficient tar catalytic cracking at the relative low temperature. The evolution process of NiFe-NiFe 2 O 4 hybrid active sites and composite char support with core–shell structure of catalyst was revealed. The optimized f600Fe-Ni@Char catalyst exhibited the high tar conversion efficiency of 92.54% at 600 °C. Meanwhile, the catalyst displayed the stable catalytic activity of approximately 80% after initial 3 cycles. The structure–property relationships of catalyst indicated that the superior catalytic behavior was ascribed to the protective effect of carbon nanofibers shell layer and the activation effect of NiFe-NiFe 2 O 4 hybrid active sites. This work provided useful information on solving the bottleneck derived from tar for biomass gasification.
研究领域:
能源科学
·
催化化学
✓ 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）