Materials
·
2021
·Vol. 14
·期 18
·5125
·
IF 3.623
Chenhua Deng,Linjie Hou,Caifeng Zhang
Recyclable, cheap, eco-friendly, and efficient adsorbent materials are very important for the removal of pollution. In this work, we report the design and implementation of ferrimagnetic-humic acid nanocomposites as superior magnetic adsorbent for heavy metals. Ferrimagnetic and ferrimagnetic-humic acid nanocomposite particles with different morphologies were prepared using the coprecipitation method and hydrothermal synthesis method, respectively. The results show that the morphology of the nanoparticles prepared by the coprecipitation method is more uniform and the size is smaller than that by the hydrothermal synthesis method. Adsorption experiments show that the ferrimagnetic-humic acid nanoparticles prepared by the coprecipitation method has high sorption capacity for cadmium, and the maximum adsorption capacity is about 763 μg/g. At the same time, magnetic technology can be used to realize the recycling of ferrimagnetic-humic acid adsorbents.Keywords:ferrimagnetic nanoparticle;heavy metal;magnetic;adsorption
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 5
·1716
·
IF 3.748
Wenda Zhou,Mingyue Chen,Cailei Yuan,He Huang,Jingyan Zhang,Yanfei Wu,Xinqi Zheng,Jianxin Shen,Guyue Wang,Shouguo Wang,Baogen Shen
Exploration for the new members of air-stable 2D antiferromagnetic magnets to widen the magnetic families has drawn great attention due to its potential applications in spintronic devices. In addition to seeking the intrinsic antiferromagnets, externally introducing antiferromagnetic ordering in existing 2D materials, such as structural regulation and phase engineering, may be a promising way to modulate antiferromagnetism in the 2D limit. In this work, the in situ nitrogen doping growth of ultrathin 2D Cr2S3nanoflakes has been achieved. Antiferromagnetic ordering in 2D Cr2S3nanoflakes can be triggered by nitrogen doping induced new phase (space group P3¯1c). This work provides a new route to realize antiferromagnetism in atomically thin 2D magnets and greatly extend applications of 2D magnets in valleytronics and spintronics.Keywords:2D magnetic materials;in situ nitrogen doping;antiferromagnetism
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 16
·9836-9844
·
IF 4.036
Zixu Ma,Beibei Yang,Junjiao Yang
Magnetic materials are being increasingly used in anti-counterfeiting coatings, but the dark colors of magnetic materials greatly limit their applications. This necessitates the development of light-colored magnetic materials. In this study, the heterogeneous precipitation method was used to deposit a layer of titanium dioxide (TiO2) on the surface of magnetic spherical metal particles, followed by the deposition of a layer of Ag by the reduction method, in order to achieve a light color. In the experiment, the particles were initially coated with a few tens of nanometers of TiO2 with a strong shading effect, followed by a further coating of Ag of the same thickness with a similar shading performance. Not only did this achieve a lighter color, but there was no reduction in the magnetic properties of the material after the application of the coating. Scanning electron microscopy (SEM), scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), X-ray diffractometry (XRD), and other methods were used to study the changes in morphology and composition before and after the magnetic material was coated. A magnetic tester was used to study the changes in magnetic strength before and after the magnetic material was coated.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 1
·715-719
·
IF 0
Zhao Dong,Pei Wenli,Wang Xiaoyang,Zheng Jian,Liu Chunhong,Wang Jianjun
NdFeB magnetic nanoparticles with a main phase of Nd2Fe14B have successfully been synthesized. The preparation includes the following processes. First, the NdFeB intermediate was synthesized by a wet-chemical method. The NdFeB intermediate was annealed at 800 °C,
which resulted in the formation of an NdFeB oxide. Then, the NdFeB oxide was reduced into NdFeB nanoparticles by a second-step reduction annealing with a CaH2 reductant. The second-step reduction annealing temperature was a key factor in preparing the NdFeB nanoparticles. A lower
reduction temperature of 900 °C could not completely reduce the NdFeB oxide into Nd2Fe14B. There were some residual unreduced nonmagnetic phases in the prepared materials, which resulted in obvious decreases of coercivity. A sufficiently high second-stage reduction
temperature resulted in an increased reduction, and more of the Nd2Fe14B phase could be obtained. In this work, nanoparticles with a uniform morphology and an increased Nd2Fe14B phase could be obtained at an optimum reduction temperature of 940 °C,
achieving a high coercivity of 5.4 kOe.
研究领域:
材料科学
·
磁学
✓ 已验证
DOI
PubMed
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 8
·5750-5762
·
IF 2.779
Ling Chen,Yimin Dai,Qi Lu,Chengqian Fang,Zhiheng Wang,Yaqi Li,Ling Cai,Bo Liu,Yue-fei Zhang,Yan Li,Li Wan
A new environmental-friendly magnetic cellulosic adsorbent MnFe 2 O 4 @Cel-g-p(AA-DMC) was easily synthesized via natural cellulose and easy-recovered magnetic particles MnFe 2 O 4 . Magnetic cellulose composites were characterized by SEM, TEM, XPS, XRD, BET, VSM, TGA and FTIR. The effect of pH, contact time and PMS dosage on adsorption was investigated. Besides, the adsorption kinetic model was well-fitted to the pseudo-second-order model, and the adsorption isotherm were matched with the Frenudlich isotherm model. The MnFe 2 O 4 @Cel-g-p(AA-DMC) posseses the excellent stability, reusability and superior superparamagnetic behavior and its possible adsorption mechanism for the adsorption of CR was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 6
·2039
·
IF 3.748
Yueqi Zhang,Bin Du,Yuting Wu,Zhiwei Liu,Jiang Wang,Jianjie Xu,Zhaoyang Tong,Xihui Mu,Bing Liu
Bacterial infection is a significant cause of morbidity and mortality to humans worldwide. Thus, a method for nonspecific, sensitive, and rapid enrichment of such bacteria is essential for bacteria detection and treatment. This study demonstrates a self-made core-shell Fe3O4@Polydopamine@Polyethyleneimine magnetic beads (Fe3O4@PDA@PEI MBs) with a high density positive charge-based magnetic separation scheme for the broad-spectrum rapid enrichment of microorganisms in the liquid phase. MBs with a high-density positive charge have a strong electrostatic attraction to most microorganisms in nature. Our scheme is as follows: (1) wrapping dopamine (DA) on the iron oxide through self-polymerization and wrapping PEI on the outermost shell layer in a mode of crosslinking with the PDA; (2) subsequently, the Fe3O4@PDA@PEI MBs were used to concentrate microorganisms from the sample solution; (3) performing magnetic separation and calculating the adsorption efficiency. The as-prepared Fe3O4@PDA@PEI MBs composite was carefully characterized by zeta potential analysis, Value stream-mapping (VSM), transmission electron microscopy (TEM), and Fourier transforms infrared spectrometry (FT-IR). In this study, both gram-positive and gram-negative bacteria could be captured in three minutes through electrostatic interaction. Furthermore, the adsorption efficiency on gram-negative (>98%) is higher than that on gram-positive (>95%), allowing for a simple, rapid assay to enrich organisms in resource-limited settings.Keywords:magnetic beads;bacterial enrichment;magnetic separation;electrostatic interaction
研究领域:
微生物学
·
医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2024
·
IF 3.8
Tianlei Yang,Yueping Guan,Buhui Ren,Yifan Sun,Xinping Jiang,Tao Li
For the application needs of histidine-rich protein separation, this study proposes to prepare a magnetic adsorbent enriched with copper ions and small particle size. Using a compression nebulizer, the magnetic + sodium alginate solution was broken into micrometer-sized droplets and cross-linked and cured with copper ion solution. The magnetic copper alginate microspheres (Cu 2+ -Alg@Fe 3 O 4 ) were obtained with an average particle size of 7.1 μm, a magnetic saturation intensity of 36.9 emu·g −1 , and a Cu 2+ content of 149.2 mg·g −1 .The adsorption equilibrium time of the Cu 2+ -Alg@Fe 3 O 4 microspheres on bovine hemoglobin(BHb) was 90 min, and the maximum adsorption amount was 4318.5 mg·g −1 . The Cu 2+ -Alg@Fe 3 O 4 microspheres also showed stable and good adsorption performance in five cyclic adsorption experiments.
研究领域:
生物材料
·
分离科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Wanjie Xu,Mingwei Ji,Yuanzhi Chen,Hongfei Zheng,Laisen Wang,Dong-Liang Peng
The construction of magnetic colloidal superparticles can utilize the properties from both individual assembly units and their collective interactions; thus, it can meet wider demands in multiple fields. Although many studies have focused on the magnetic oxide superparticles, very limited study has been conducted on magnetic metal superparticles. Herein, we report on the microemulsion-based preparation of Ni colloidal superparticles with tunable sizes and magnetic properties. The prepared Ni colloidal superparticles have a spherical morphology with an average size that can vary from 130 to 700 nm. The key influential factors in the formation of superparticles are being investigated. Magnetic measurements reveal room-temperature superparamagnetic characteristics for all superparticle samples. The calculated interaction energy values indicate that strong magnetic interactions are present in Ni superparticles. Although Ni superparticles with a size of about 700 nm are still room-temperature superparamagnetic, annealed Ni superparticles with a much smaller size of about 390 nm instead exhibit room-temperature ferromagnetic characteristics. This behavior is quite different from that of magnetic nanoparticles. Our results demonstrate that the construction of magnetic colloidal superparticles through adjustments to the parameters of the assembling units may provide them with rich magnetic properties, thus making them useful in a wider range of applications.
研究领域:
材料科学
·
磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 20
·2405686
·
IF 26.8
Heng Zhang,Yiying Zhang,Yong Zhang,Bo Chen,Jingwen Guo,Yu Du,Jiajun Li,Fuwei Zhou,Fengyi Guo,Yongxin Zhang,Zixiang Zhao,Hangkai Xie,Zhixin Zhang,Tianqi Wang,Wuyi Qi,You Song,Fucong Fei,Xuefeng Wang,Fengqi Song
MnBi 2n Te 3n+1 is a representative family of intrinsic magnetic topological insulators, in which numerous exotic phenomena such as the quantum anomalous Hall effect are expected. The high-quality crystal growth and magnetism manipulation are the most essential processes. Here a modified chemical vapor transport method using a feedback-regulated strategy is developed, which provides the closed-loop control of growth temperature within ± 0.1 °C. Single crystals of MnBi 2 Te 4 , MnBi 4 Te 7 , and MnBi 6 Te 10 are obtained under different temperature intervals respectively, and show variable tunability on magnetism by finely tuning the growth temperatures. Specifically, the cold-end temperatures not only vary the strength of antiferromagnetic coupling in MnBi 2 Te 4 , but also induce magnetic ground state transitions from antiferromagnetism to ferromagnetism in MnBi 4 Te 7 and MnBi 6 Te 10 . In MnBi 2 Te 4 with optimized magnetism, quantized transport with Chern insulator state can be easily replicated. These results provide a systematic picture for the crystal growth and the rich magnetic tunability of MnBi 2n Te 3n+1 family, providing richer platforms for the related researches combining magnetism and topological physics.
研究领域:
凝聚态物理
·
拓扑材料
·
晶体生长
·
磁性
·
量子输运
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei-Bin Wu,Yuan-Qiao Chen,Qi-Ling Xiao,Jun-Yi Ge
The Co-Te system has become a prominent field of research in recent times. CoTe 2 is confirmed to be a Dirac semimetal, while Co 2 Te is predicted to host the quantum anomalous Hall effect. Here, we have successfully grown high-quality Co 2 Te 3 single crystals using the solid-state reaction method and have characterized them using the energy dispersive X-ray spectroscopy, the X-ray diffraction and Laue diffraction. The X-ray rocking curve with a full-width at half-maximum of 0.067° shows Co 2 Te 3 single crystals have good crystalline quality and mosaicity. Co 2 Te 3 single crystals possess a hexagonal structure with the space group of P 6 3 / mmc . Resistivity measurements reveal typical metallic behavior with a transition from Non-Fermi liquid to low-temperature Landau Fermi-liquid behavior around 50 K, which can be fitted by the parallel resistance model. Magnetic measurements show no obvious anisotropy between the in-plane and out-of-plane directions with the presence of a small magnetic hysteresis at 1.8 K. Furthermore, Co 2 Te 3 single crystals undergo a magnetic phase transition around 50 K and an antiferromagnetic transition modulated by the magnetic field below 8 K.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Zuxue Mo,Hongwei Guo,Yufei Wang,Hairong Yin,Chen Yang,Jianbo Song
Magnetic paper manufactures are nowadays widely used in information storage, electromagnetic shielding and security industry for its outstanding performances. In this article, Tb-doped germanium borosilicate glass was prepared by melt quenching technique and they were used as magnetic sources of magnetic paper to loading into the bamboo fibers. Magnetic paper has been successfully produced by adding inorganic magnetic particles modified by different concentrations of graphene oxide (GO) solution. The samples were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy , Superconducting Quantum Interferometer Device (SQUID) and Scanning Electron Microscope (SEM). The results shown that the structure of magnetic particle are made from [BO 3 ], [BO 4 ], [A1O 6 ], [SiO 4 ] and [GeO 4 ]. GO sheets had been successfully immobilized on magnetic particles (MPs) surface via electrostatic interaction . SQUID indicated that the magnetic particles and papers were paramagnetic materials . SEM images clearly shown that the MPs loaded into the lumen of bamboo fibers and the interstitial of fibers. Bridge-fibers that connecting other cellulose fibers and MPs by hydrogen bonds were formed in the network of paper due to the functional groups on surface of magnetic particles. The mechanical properties of papers increased with the increment of GO concentration, which is correlated with the hydrogen-bonding that forming by bridge-fibers and other cellulose fibers in network of paper.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 35
·21476-21483
·
IF 3.108
Mingsen Chen,Guisheng Gong,Li Zhou,Faai Zhang
This study proposes a simple method to fabricate a magnetic self-healing poly(vinyl alcohol) (ms-PVA) composite hydrogel. The obtained ms-PVA hydrogel was characterized by vibrating sample magnetometery and transmission electron microscopy. The self-healing property was investigated using a rheometer and tensile strength tests. Results showed that the ms-PVA hydrogel exhibited an excellent self-healing property and controllable magnetic intensity by adjusting the Fe3O4 particle content. The added Fe3O4 particles did not participate in hydrogen bond interactions but did cause the magnetic properties of the hydrogel. The hydrogel showed the best self-healing performance when the amount of Fe3O4 particles was 5 wt% (based on ms-PVA). The ms-PVA composite hydrogel presents a new application of the PVA hydrogel given its facile fabrication process and excellent performance.
研究领域:
材料科学
·
生物医学工程
✓ 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）