MATERIALS RESEARCH BULLETIN
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2012
·
IF 2.105
Jing Liu,Lu Wang,Jing Wang,Lantong Zhang
A new solvothermal method is proposed for the preparation of Fe 3 O 4 nanoparticles (NPs) from iron acetylacetonate in the presence of oleylamine and n- hexane. The products are characterized by X-ray powder diffraction, infrared (IR) spectroscopy, transmission electron microscopy, thermogravimetry/differential thermogravimetry (TG/DTG) analysis, and vibrating sample magnetometery. The new procedure yields superparamagnetic monodispersed Fe 3 O 4 particles with sizes ranging from 7 nm to 12 nm. The nanocrystal sizes are controlled by adjusting the volume ratio of oleylamine to n- hexane. IR and TG/DTG analyses indicate that the oleylamine molecules, as stabilizers, are adsorbed on the surface of Fe 3 O 4 NPs as bilayer adsorption models. The surface adsorption quantities of oleylamine on 7.5 and 10.4 nm-diameter Fe 3 O 4 NPs are 18% and 11%, respectively. The hydrophobic surface of the obtained nanocrystals is passivated by adsorbed organic solvent molecules. These molecules provide stability against agglomeration, enable solubility in nonpolar solvents, and allow the formation of magnetic polymer micelles.
研究领域:
材料科学
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纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 8
·5750-5762
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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
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Na Li,Zhenyuan Ji,Lizhi Chen,Xiaoping Shen,Yifei Zhang,Shiqing Cheng,Hu Zhou
In this study, highly dispersed Ag nanoparticles anchored on Fe 3 O 4 modified polydopamine sub-micrometer spheres (PSS) nanocomposites were fabricated by a facile two-step approach. The catalytic properties of the as-obtained PSS/Fe 3 O 4 /Ag ternary nanocomposites were evaluated with the reduction of 4-nitrophenol by NaBH 4 as a model reaction. It is shown that the presence of Fe 3 O 4 can significantly decrease the particle size of the in-situ formed Ag nanoparticles on PSS, and optimize the catalytic performance of PSS/Ag nanocomposites. Additionally, the as-synthesized PSS/Fe 3 O 4 /Ag ternary nanocomposites exhibit high catalytic stability for recycle. Magnetic study reveals that the ternary nanocomposites display room-temperature superparamagnetic behavior. It is believed that this simple and effective method can be extended for the preparation of other polydopamine-based multicomponent nanocomposites with intriguing property, which would hold great promise for a variety of applications.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Xiaoshuang Zhao,Jieying Zhang,Yifan Chen,Ziting Chen,Zhe Liu,Yi Xu,Xingjun Zhu,Yang Li,Xianqiang Mi
With the rapid development of precise medicine, microbeads-based fluorescence bio-coding technology for multiplexed detection has attracted increasing attentions. However, traditional multiplexed bio-analysis could not meet the demand for multiplexed detection due to the limitations of labeling dyes and microscope channels. Here, a novel fluorescence encoding strategy was proposed by using multi-color quantum dots (QDs) acted as fluorescence tags and micron sized superparamagnetic particle acted as encoding carrier. By adjusting the color and number of labeled QDs, fluorescence encoded superparamagnetic particles (FESPs) with distinct fluorescence colors and intensities were constructed. The FESPs were prepared by metal coordination-based layer-by-layer assembly with excellent binding effect. By binding DNA capture oligonucleotides, FESP probes were constructed for multiplexed detection of miRNA-21, miRNA-122 and miRNA-130b with excellent specificity. Moreover, the miRNA targets could be easily separated within 5 s originated from the excellent superparamagnetism, enabling great simplified bio-analysis process. The results demonstrated here will provide opportunities to realize the full potentials of fluorescence bio-coding in biomedical detection and diagnosis.
研究领域:
生物医学工程
·
分子诊断学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
·
IF 4.162
Xing-Yu Long,Jia-Yuan Li,Dong Sheng,Hong-Zhen Lian
The spinel-type magnetic manganese ferrite (MnFe 2 O 4 ) microspheres synthesized by simple solvothermal method were used as a novel adsorbent for selective enrichment and effective isolation of phosphopeptides. The uniform MnFe 2 O 4 magnetic affinity microspheres (MAMSs) had a narrow particle size distribution between 250 and 260 nm, and displayed superparamagnetism with a saturation magnetization value of 67.0 emu/g. Comprehensively, the possible formation mechanism of MnFe 2 O 4 microspheres with ferric and manganous sources as dual precursors was elucidated by comparison with those of Fe 3 O 4 nanoparticles and MnOOH nanosheets respectively with either ferric or manganous source as single precursor. It was suggested that the spherical or sheet nanostructures could be achieved via secondary recrystallization or Ostwald ripening . The MnFe 2 O 4 MAMSs probe exhibited excellent dispersibility in aqueous solution, and rapid magnetic separation within 15 s, as well as good reusability. More importantly, MnFe 2 O 4 was highly selective for phosphopeptides because of the strong coordination interaction between metal ions (Fe 3+ and Mn 2+ ) and phosphate groups of phosphopeptdies. This high specificity was demonstrated by effectively enriching phosphopeptides from digest mixture of β -casein and bovine serum albumin (BSA) with high content of non-phosphopeptides, and embodied further in phosphopeptides enrichment from non-fat milk digests and human serum. Consequently, the prepared MnFe 2 O 4 affinity materials are expected to possess great potential in phosphoproteome research.
研究领域:
生物化学
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材料科学
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蛋白质组学
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产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 23
·5157
·
IF 2.217
Yongpeng Chen,Jianguo Zhang,Zhixin Wang,Zunning Zhou
Superparamagnetic iron oxide nanoparticles are of great interest in magnetic targeted drug delivery due to their unique properties. In this paper, size-controlled superparamagnetic iron oxide nanoparticles were synthesized in an ethylene glycol/diethylene glycol (EG/DEG) binary solvent system via a facile solvothermal method. X-ray diffraction (XRD), a scanning electron microscope (SEM), and a vibrating sample magnetometer (VSM) were used to confirm that the prepared samples were superparamagneticFe3O4nanospheres. When theVEG/VDEGwas varied from 100/0 to 80/20, 60/40, and 40/60, the average diameters of the resultingFe3O4nanospheres were approximately 700, 500, 300, and 100 nm, respectively. In addition, the saturation magnetization (Ms) ofFe3O4nanoparticles with a size of 100, 300, 500, and 700 nm was 72.14, 75.94, 80.28, and 85.41 emu/g, and the corresponding remanent magnetization (Mr) was 3.34, 3.97, 3.26, and 4.28 emu/g, respectively. The relevant formation mechanisms ofFe3O4nanoparticles are proposed at the end. These superparamagneticFe3O4nanoparticles with high saturation magnetization may have use as targeted drug carriers.Keywords:targeted drug delivery;superparamagnetic;size-controlled;solvothermal method
研究领域:
材料科学
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纳米医学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 1
·248
·
IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
研究领域:
材料科学
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环境科学
✓ 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
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分离科学
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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
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磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23981-23993
·
IF 2.914
Li Lincheng,Zhong Dengjie,Xu Yunlan,Zhong Nianbing
In order to improve the adsorption efficiency of the adsorbent and solve the problem of separation difficulty, a novel superparamagnetic micro-nano-bio-adsorbent (PDA/Fe 3 O 4 /BC) was prepared by in situ self-assembly of polydopamine (PDA). The results of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and vibrating sample magnetometer (VSM) characterization showed that the size of bio-adsorbent was about 200 nm. PDA and Fe 3 O 4 modifications increased the specific surface area of adsorbent, changed the surface functional group of biochar (BC), and made the adsorbent have super-high magnetization (294.76 emu g −1 ). PDA/Fe 3 O 4 /BC was applied to treat Cr wastewater. The results show that the adsorption of Cr by PDA/Fe 3 O 4 /BC includes single-layer and multilayer adsorption. The adsorption follows the pseudo-second-order kinetic model. The adsorption is spontaneous and endothermic, and its maximum adsorption capacity and activation energy are 25.25 mg g −1 at 318 K and 23.108 kJ mol −1 , respectively. After adsorption treatment, PDA/Fe 3 O 4 /BC still possesses high magnetization (233.04 emu g −1 ). PDA/Fe 3 O 4 /BC can treat actual electroplating wastewater with Cr(VI) concentration from 20 mg L −1 to less than 0.2 mg L −1 , which met the PRC discharge standard (GB/21900-2008) of electroplating pollutants.
Graphical abstract
研究领域:
环境科学
·
环境工程
·
纳米材料
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水污染治理
·
应用化学
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 6
·585
·
IF 2.935
Xiaoqiao Fan,Jinqiu Xiao,Wentao Wang,Yuang Zhang,Shufen Zhang,Bingtao Tang
Superparamagnetic materials have elicited increasing interest due to their high-efficiency magnetothermal conversion. However, it is difficult to effectively manage the magnetothermal energy due to the continuous magnetothermal effect at present. In this study, we designed and synthesized a novel Fe3O4/PEG/SiO2composite phase change material (PCM) that can simultaneously realize magnetic-to-thermal conversion and thermal energy management because of outstanding thermal energy storage ability of PCM. The composite was fabricated by in situ doping of superparamagnetic Fe3O4nanoclusters through a simple sol–gel method. The synthesized Fe3O4/PEG/SiO2PCM exhibited good thermal stability, high phase change enthalpy, and excellent shape-stabilized property. This study provides an additional promising route for application of the magnetothermal effect.Keywords:superparamagnetic Fe3O4nanocluster;magnetothermal conversion;phase-change material;thermal energy management
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 133
·期 1
·
IF 1.768
Caideng Yuan,Mingtong Cui,Longlong Feng,Jingpeng Wang,Yan Peng
An amino-functionalized nano-adsorbent (DETA-MNPs) was prepared by a process involving: (1) synthesis of superparamagnetic Fe 3 O 4 nanoparticles; (2) introduction of amino groups after which ATRP initiator was anchored; (3) grafting of glycidyl methacrylate (GMA) via SI-ATRP; and (4) ring-opening reaction of epoxy groups with diethylenetriamine (DETA). The nano-adsorbent was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM) and applied to remove Cu(II) in batch experiments. The effects of pH, Cu(II) concentrations, solution ionic strength, and contact time were investigated. The results show that the DETA-MNPs are spherical with cubic spine structure, high saturation magnetization (41.9 emu g −1 ), and an average diameter of 10 nm. The maximum Cu(II) adsorption capacity achieves 83.33 mg g −1 at pH 5.0 by Langmuir model. The adsorption process is highly pH-dependent and reaches equilibrium within 20 min. Furthermore, the DETA-MNPs exhibit excellent dispersibility and reusability. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 132 , 42859.
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
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