RSC Advances
·
2015
·Vol. 5
·期 106
·86885-86890
·
IF 3.84
Hechun Lin,Qianqian Luo,Wen-Yi Tong,Chunli Jiang,Rong Huang,Hui Peng,Lai-Chang Zhang,Jadranka Travas-Sejdic,Chun-Gang Duan
EuS and Gd2O2S nanocrystals with narrow size distribution are synthesized in high yields by the thermal decomposition of Eu(oleate)3 or Gd(oleate)3 in oleylamine using CS2 as the sulfur source. The dimensionalities of these nanocrystals can be facilely tuned by the addition of 1-dodecanethiol. The morphologies and crystal structures of EuS and Gd2O2S nanocrystals are characterized by TEM and XRD. The magnetic properties of the obtained nanocrystals are also investigated. The experimental results illustrate that CS2 is an effective sulfur source for the preparation of metal sulfide and lanthanide oxysulfide semiconductor nanocrystals.
研究领域:
材料科学
·
纳米科技
·
无机化学
·
半导体物理
·
磁性材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 68
·38850-38859
·
IF 2.936
Yaozu Guo,Dong Zhao,Junhua You,Wenli Pei,Yingdong Qu,Xiaoyang Wang,Qingyu Meng
Nd2Fe14B nanoparticles were successfully prepared by using a low-energy chemical method. The microscopic characteristics and formation mechanisms of the phases were investigated at each stage during the preparation of Nd-Fe-B nanoparticles. The Nd-Fe-B intermediates, Nd-Fe-B oxides and reduced Nd-Fe-B nanoparticles were detected and analyzed by using TEM, STEM, XRD, SEM, VSM and Rietveld calculations. The results showed that the intermediate of Nd-Fe-B consisted of Fe3O4 and Nd and Fe elements surrounded by nitrile organic compounds. The Nd-Fe-B oxide was composed of NdFeO3 (48.619 wt%), NdBO3 (31.480 wt%) and α-Fe (19.901 wt%), which was formed by the reaction among Nd, Fe3O4 and B2O3. NdFeO3 and NdBO3 exhibited a perovskite-like lamellar structure, and the grain size was smaller than that of α-Fe. Nd-Fe-B particles were mainly composed of Nd2Fe14B and α-Fe phases. The small particles of NdFeO3 and NdBO3 and the interstitial position between oxide particles and α-Fe were more favorable for the formation of Nd2Fe14B particles. At the same time, the surface of α-Fe particles can also diffuse to form Nd2Fe14B nanoparticles. The coercivity of Nd-Fe-B particles was 5.79 kOe and the saturation magnetization was 63.135 emu g−1.
研究领域:
材料科学
·
纳米材料
·
磁性材料
·
无机非金属材料
·
固体化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2011
·Vol. 86
·期 4
·1760-1767
·
IF 3.463
Wen Zhang,Shiyan Chen,Weili Hu,Bihui Zhou,Zhenhua Yang,Na Yin,Huaping Wang
Flexible magnetic membranes based on bacterial cellulose (BC) with amphiphobicity were prepared firstly by the in situ synthesis of the Fe 3 O 4 nanoparticles on the BC nanofibers and then the fluoroalkyl silane (FAS) modification. X-ray diffraction (XRD) patterns indicated the Fe 3 O 4 nanoparticles had a spinel structure and field emission scanning electron microscopy (FE-SEM) revealed the Fe 3 O 4 nanoparticles were homogeneously deposited on the BC nanofibers. FT-infrared (FTIR) spectra and energy-dispersive spectrum (EDS) demonstrated the presence of FAS. After FAS modification on the magnetic BC membrane prepared by the in situ synthesis of the Fe 3 O 4 nanoparticles, the surface wettability of BC membrane was converted from amphiphilicity to amphiphobicity. The fluorinated membrane with appropriate roughness showed the highest water contact angle (WCA) of 130° and oil contact angle (OCA) of 112°. Additionally, the magnetometric measurements revealed that the membranes exhibited the superparamagnetic behavior and can be magnetically actuated. Magnetically responsive BC membrane with hydrophobic and lipophobic surface would have potential applications in electronic actuators, magnetographic printing, information storage, electromagnetic shielding coating and anti-counterfeit.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
磁性材料
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Lei Zhang,Feng Xu,Jian Zhang,Baoru Bian,Yong Hu,Fei Xue,Juan Du
Magnetically anisotropic nanoparticle monolayer films are of great interest for the development of applications such as high-density data storage, sensors. However, the formation of large-scale magnetically anisotropic monolayer film is a challenging task. Here, we provide a new way to fabricate large-scale area of Fe 3 O 4 nanoparticle monolayer films by vacuum deposition technique (matrix-assisted pulsed laser evaporation, MAPLE). During the deposition process, only interactions between nanoparticles influence nanoparticle self-assembly behaviors. A strong magnetic anisotropy, characterized by in-plane and out-of-plane coercivity and saturation field obtained by DCM (dynamic cantilever magnetometry), was obtained both in cubic and spherical Fe 3 O 4 nanoparticle monolayer films. The inter-particle dipolar interaction but not crystal anisotropy is responsible for this effective magnetic anisotropy, which has been proved by Monte-Carlo simulations.
研究领域:
材料科学
·
纳米技术
·
磁性材料
·
薄膜沉积
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ben Chen,Tingting Lin,Haibo You,Liqun Fang,Chu Chu,Jintao Yang,Shengqiang Tong
The surface of SiO 2 coated magnetic nanoparticles (NMPs) was modified by bonding with sulfobutylether- β -cyclodextrin (SBE- β -CD) via carbodiimide activation for the first time. The magnetic nanoparticles were synthesized by chemical coprecipitation method under alkaline condition, and the magnetic particles were modified by citric acid . Then the surface of obtained magnetic nanoparticles was coated with SiO 2, and SBE- β -CD modified by citric acid was bonded to the surface of Fe 3 O 4 /SiO 2 MNPs under carbodiimide activation method. The synthesized functionalized magnetic nanoparticles were characterized by X-ray Diffraction, Fourier Transform Infra-Red spectroscopy, thermogravimetric analyses and transmission electron microscopy . These functional nano-sized particles were scrutinized for enantioselective liquid-liquid extraction of five racemic drugs/intermediates, including trans -paroxol, N-methyl duloxetine , fluoxetine , tropic acid and acetyltropic acid, and it was found that compared with traditional SBE- β -CD, the present magnetic silica nanoparticles bonded with SBE- β -CD showed higher enantiorecognition with some racemates using enantioselective liquid-liquid extractions. To our knowledge, this is the first-time report on preparation and application of magnetic nanoparticles bonded with SBE- β -CD in enantioselective liquid-liquid extraction for chiral separations .
研究领域:
纳米材料
·
分析化学
·
手性分离
·
磁性材料
·
超分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hongwei Yang,Meijun Guo,Fang Xu,Yulong Liao,Yong Ren,Guixiang Liu,Honglan Lai,Bochengwen Sun,Bo Dai
In this study, nanoparticles of LiZn ferrite (nano-LiZn, 0.0–10.0 wt. %) fabricated via the sol-gel method and V 2 O 5 particles were added into a Li 0.43 Zn 0.27 Ti 0.13 Fe 2.17 O 4 (LiZnTi) ferrite to realize low temperature sintering . The effects of the nano-LiZn ferrite addition on the crystalline phase formation, microstructure, and magnetic properties of LiZnTi ferrite were systematically investigated. X-ray diffraction results reveal that the LiZnTi ferrite doped with nano-LiZn and V 2 O 5 additives present a pure spinel structure, which can be explained by liquid phase of V 2 O 5 and spinel structure of nano-LiZn, as revealed by high-resolution transmission electron microscopy and selected area electron diffraction data. Scanning electron microscopy images show that the addition of nano-LiZn leads to a change in the microstructure, with the grains becoming uniform and dense. Additionally, the variation in the saturation magnetization ( M s ) depends on the LiZn content. In particular, M s increases with increasing LiZn content from 2.0 to 10.0 wt. %. Finally, the LiZnTi ferrite doped 4.0 wt. % nano-LiZn and 0.60 wt. % V 2 O 5 possesses a narrow ferromagnetic resonance linewidth of 197 Oe, a reduced coercivity of 192.6 A/m, and an improved bulk density of 4.73 g/cm 3 .
研究领域:
材料科学
·
磁性材料
·
陶瓷
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qianqian Wang,Lidong Yang,Ben Wang,Edwin Yu,Jiangfan Yu,Li Zhang
Dynamic self-assembly represents an effective approach to form energy-dissipative structures by introducing interactions among multiple building blocks with a continuous energy supply. Time-dependent magnetic fields are treated as convenient energy inputs to construct such a dynamic self-assembled system. The induced interactions can be further tuned by modulating the input field, resulting in a diversity of assembled patterns. However, formation of a functional dynamic pattern with controllability remains a challenge. Herein, we report the formation and pattern control of dynamically self-assembled magnetic droplets at an air–liquid interface, energized by a precessing magnetic field. The formation process involves the assembly of magnetic microparticles into particle chains inside droplets, and then highly ordered patterns are generated by balancing the induced interactions among droplets. By modulating the input field, the interactions and collective behaviors are adjusted and the pattern can be reversibly tuned, i.e., expand and shrink, in a controlled manner. Furthermore, the assembled droplets are able to be steered in two-dimensional as an entity by applying a magnetic field gradient. Utilizing dynamic pattern control and steerability of the assembled structure, cargoes are successfully trapped, transported, and released in a noncontact fashion, indicating that the dynamically assembled droplets can act as a reconfigurable untethered robotic end-effector for manipulation.
研究领域:
软物质物理
·
微型机器人
·
活性物质
·
磁性材料
·
自组装
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2024
·
IF 2.5
Jitao Zhang,Xingkui Mu,Qingfang Zhang,Natallia Poddubnaya,Dmitry Filippov,Jiagui Tao,Fang Wang,Liying Jiang,Lingzhi Cao
Development of high-quality ferrites behaved enhanced properties via inclusion of ions in 3d n and 4f n series are desirable for efficient power conversion solid-state devices. Nevertheless, inadequate microscopic behaviors with complex chemistry in materials enables researchers to design and produce the macroscopic target device that remained rudimentary and mindless. In this work, the microscopic properties in nickel-zinc spinel ferrite series of Ni 0.8 Zn 0.2 Sm x Fe 2- x O 4 ( x = 0, 0.02, 0.04, 0.06, 0.08) encompassing XRD, SEM, EDS, VSM, FTIR and ESR were systemically characterized, and the evolutionary mechanism of the corresponding structural, micro-structure, elemental composition and distribution, magnetic, cations exchange, and micro-magnetic behavior was profoundly revealed. Under microscopic examinations, the optimum composition at x = 0.02 with well-arranged spinel structure, dense texture with expected elemental composition, favorable soft magnetic properties and micro-magnetic behaviors is evident. Fortunately, this optimum is in coincidence with the achievable maximum magneto-mechanical coefficient, even the macroscopic electric properties with stronger magnetoelectric (ME) interactions and higher power conversion efficiency (PE) in tri-layered ME samples as expected. Experimental results show that the eventual PE reaches its maximum of 75.67 % under R opt = 33kΩ for samples at x = 0.02, and exhibit a 2.24 times higher PE than that of sample without samarium substitution. These findings provide a holographic perspective to connect the microscopic beneficial effects of materials to bulk device that are promising for efficient power conversion solid-state electronics.
研究领域:
材料科学
·
磁性材料
·
固态电子学
·
功能陶瓷
·
能源转换技术
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2013
·
IF 2.072
Jun Liang,Huiru Ma,Wei Luo,Shouling Wang
Magnetite submicrospheres with an average size range of 90–490 nm were obtained by a facile polyol process. The effects of reaction conditions on the morphology and static magnetism of magnetite submicrospheres were studied when the reaction time, the concentration of component, and the types of the solvent or surfactant changed. The average size of primary crystals was controlled by changing the concentration of surfactant thus the superparamagnetism was obtained, meanwhile the average size of secondary clusters was tuned by changing the concentration of ferrous precursor FeCl 3 ·6H 2 O. The ratio of ethylene glycol and diethylene glycol , the concentration of NaAC, and the reaction time all exhibited novel effects on the morphology of magnetite submicrospheres facilitating our understanding about the synthesis mechanism. The synthesized magnetite submicrospheres were successfully used for photonic crystal .
研究领域:
材料科学
·
纳米技术
·
磁性材料
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Fang Xu,Shuai Xiong,Yan Yang,Hongwei Yang,Yong Ren,Fei Xie,Guixiang Liu,Bo Dai
In this work, LiZnTi ferrites doped with various V 2 O 5 additives were successfully prepared using hot-press sintering. The influences of V 2 O 5 dopant amount and holding time on phase composition, microstructure and gyromagnetic properties of the low-sintered LiZnTi ferrite were studied. Results showed that the grain growth behavior of the LiZnTi ferrites was closely interrelated with dopant amount and holding time as result of changes of critical driving force ( Δg c ). Moreover, the relative density of all the ferrite samples was very high ( ρ r >99 %). However, we found that the longer holding time (can reduce Δg c ), which is benefit for grain growth and improvement of saturation magnetization (4π M s ) of LiZnTi ferrites, resulted in the deterioration of ferromagnetic resonance (FMR) linewidth ( ΔH ) instead. Finally, due to synergistic effect of applied pressure and V 2 O 5 dopant, the LiZnTi ferrite ( x = 0.10) sintered at 900 °C for 10 mins possessed a small average grain size (GS ave. = 0.69 μm ), very high relative density ( ρ r = 99.35 % ) , high saturation magnetization (4π M s = 4193.2 G s) and a relatively low ferromagnetic resonance linewidth ( ΔH = 449.1 Oe).
研究领域:
材料科学
·
无机非金属材料
·
磁性材料
·
电子陶瓷
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhixin Yao,Yuandong Peng,Chao Xia,Xuwu Yi,Shenghua Mao,Miantuan Zhang
The effect of calcination temperature on the coating layer and the phase of the alloy matrix is the main problem to improve the heat treatment process of SMCs and obtain excellent magnetic properties . In this study, FeNiMo@Al 2 O 3 powders which were coated by sol-gel and calcined at 900–1300 °C were prepared and these powders were pressed into SMCs. The results showed that the surface of the powder was uniformly coated with Al 2 O 3 . As the heat treatment temperature increases, the phase of the coating changed from AlOOH to γ-Al 2 O 3 , δ-Al 2 O 3 , θ-Al 2 O 3 , and α-Al 2 O 3 . Meanwhile, the new phase γ-Fe, Ni appeared in the alloy matrix. The magnetic permeability of the sample is very stable in the frequency range of 10–500 kHz. The magnetic loss decreases first and then increases, with a minimum at 1100 °C. The permeability and magnetic loss of the sample pressed from the powder obtained by calcination at 1100 °C are 321.78 mw/cm 3 and 87.61 (50 kHz, 100 mT) at the typical industrial application conditions of Iron–Nickel SMCs. The microstructure and the magnetic properties show that the obtained α-Al 2 O 3 have excellent insulation and heat resistance. This resulted in a significant reduction in core losses of FeNiMo SMCs.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
·
粉末冶金
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2020
·Vol. 126
·期 11
·826
·
IF 1.81
Cheng Chen,Dai Jianfeng,Feng Wei,Li Zengpeng,Wen Xinchao
In this paper, different forms of fibers can be obtained by adjusting the rotating speed of the collecting cylinder. This is due to the centripetal force generated by the collecting cylinder when the precursor colloid is on the collecting drum, which makes the diameter of nanofibers change significantly, thus forming different nanofibers and nanobelts. The average diameter of nanofibers increased from 0.09 μm to 0.79 μm, and finally decreased to 0.17 μm. The results show that the morphology of nanofibers also has a significant effect on the magnetic properties of the materials, which is due to the interaction of domain rotation and fiber crystallization. The coercivity of nanoribbons is 1145.39 Oe. The research in this field is of great significance to the industrial production of nanofibers and the morphology and application of nanofibers.
研究领域:
材料科学
·
纳米科技
·
磁性材料
·
功能材料
·
高分子材料
·
凝聚态物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）