ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaocheng Hu,Guodong Nian,Xueya Liang,Lei Wu,Tenghao Yin,Haotian Lu,Shaoxing Qu,Wei Yang
Magnetic hydrogels have promising applications in flexible electronics, biomedical devices, and soft robotics. However, most existing magnetic hydrogels are fragile and suffer insufficient magnetic response. In this paper, we present a new approach to fabricate a strong, tough, and adhesive magnetic hydrogel with nontoxic polyacrylamide (PAAm) hydrogel as the matrix and the functional additive [3-(trimethoxysilyl)propyl methacrylate coated Fe3O4] as the inclusions. This magnetic hydrogel not only offers a relatively high modulus and toughness compared to the pure hydrogel but also responds to the magnetic field rapidly because of high magnetic particle content (up to 60%, with respect to the total weight of the polymers and water). The hydrogel can be bonded to hydroxyl-rich hard and soft surfaces. Magnetic hydrogel with polydimethylsiloxane (PDMS) coating exhibits excellent underwater performance. The bonding between magnetic hydrogel and PDMS is very stable even under cyclic loading. An artificial muscle and its magnetomechanical coupling performance are demonstrated using this hydrogel. The adhesive tough magnetic hydrogel will open up extensive applications in many fields, such as controlled drug delivery systems, coating of soft devices, and microfluidics. The strategy is applicable to other functional soft materials.
研究领域:
材料科学
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生物医学工程
·
软体机器人技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1057
·
IF 3.9
Rongwei Zheng,Ruifan Tan,Yali Lv,Xiaoling Mou,Junqiao Qian,Ronghe Lin,Ping Fang,Weidong Kan
Iron-based materials are widely applied in Fenton chemistry, and they have promising prospects in the processing of wastewater. The composition complexity and rich chemistry of iron and/or oxides, however, hamper the precise understanding of the active sites and the working mechanism, which still remain highly controversial. Herein, iron oxides of four different model systems are designed through a conventional precipitation method plus H2reduction treatment. These systems feature Fe@Fe3O4with abundant oxygen vacancy, Fe0and Fe3O4particles with interface structures, and Fe3O4-dominated nanoparticles of different sizes. These materials are applied in the decomposition of methyl orange as a model reaction to assess the Fenton chemistry. The Fe@Fe3O4with core–shell structures exhibits significantly higher decomposition activity than the other Fe3O4-rich nanoparticles. A thin Fe3O4layer formed by auto-oxidation of iron particles when exposed to air can boost the activity as compared with the Fe0and Fe3O4particles with interface structures but poor oxygen vacancy. The unique hetero-structure with the co-existence of both metallic iron and oxygen vacancy displays excellent redox propensity, which might account for the superior Fenton activity. This finding provides a new perspective to understand and design highly efficient iron-based Fenton catalysts.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Tianhao Xia,Yuwen Yuan,Yunpeng Wang,Pragati Awasthi,Wenkun Dong,Xvsheng Qiao,Dong Chen,Shisheng Ling,Xianping Fan
This study aims to advance the development of magnetic fluorescent polymer microspheres for biomedical detection applications. Conventionally, dopants have utilized europium(III) (Eu(III)) organic complexes due to their high compatibility with polymers and strong fluorescence. However, as the common magnetic material Fe 3 O 4 can quench their fluorescence, it is hard to synthesize Eu complex-doped magnetic fluorescent materials. To maintain fluorescence in the presence of magnetic parts, in this work, we synthesized Eu-doped magnetic microspheres with multi-layered structure. Firstly, poly-(glycidyl methacrylate) (PGMA) microspheres were prepared as templates and subsequently coated with layers of Fe 3 O 4 and SiO 2 . Then, the synthesized Eu(TTA) 3 (TPPO) 2 were added into PGMA@Fe 3 O 4 @SiO 2 microspheres in either basic or acidic conditions, and covered them with an extra sol–gel layer of silica at the same time. The microspheres exhibit a core–shell structure with sub-micron dimensions (580 nm) and possess favorable superparamagnetic properties ( M s = 22.02 A·m 2 /kg, M r = 1.37 A·m 2 /kg, H c = 0.242 A/m). But the fluorescence of Eu 3+ are significantly quenched by Fe 3 O 4 , O–H oscillators, and N–H oscillators. Finally, to exclude the quenching mentioned above, the first pure SiO 2 shielding layer and the second Eu(TTA) 3 (TPPO) 2 -dispersed SiO 2 layer were coated onto PGMA@Fe 3 O 4 microspheres to prevent the energy transfer due to the quenching centers and hold the fluorescence of Eu 3+ . These findings underscore the considerable potential of these microspheres exhibiting rapid magnetic separation and stable fluorescence for bioimaging and biosensing applications.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jiancong Kang,Chuanshuang Hu,Xiaoqi Liu,Hongyang Zhou,Xiuyi Lin,Jin Gu
A facile one-pot method was reported for synthesizing magnetic cellulose nanocrystals (CNC) loaded with iron tetroxide (Fe3O4) nanoparticles. Initially, microcrystalline cellulose (MCC) was treated with a 1 M solution of ferric chloride (FeCl3) and hydrolyzed into CNCs. The FeCl3 played a dual role, acting both as a cellulose hydrolytic medium and as an Fe3O4 precursor. Subsequently, CNCs served as a stabilizing and sole reducing agent for the in situ formation of Fe3O4 nanoparticles during the solvothermal reaction. The impact of the cellulose substrate, reaction solvent, solvothermal time, and MCC solid-to-liquid ratio on the growth, morphology, and crystal structure of ferrite was investigated. Pure and small sphere-like Fe3O4 (∼30 nm) nanoparticles were successfully immobilized and reduced on the CNC surface when ethanol was used, and the solvent heating time was extended to 3–30 h. Complete reduction of Fe3+ to Fe3O4 was achieved when the MCC solid to FeCl3 solution ratio was higher than 1 g:75 mL. Under optimized conditions, the resulting CNC/Fe3O4 hybrid contained 33.3% Fe3O4 and exhibited a maximum saturation magnetization (Ms) value of 22.0 emu/g with low coercivity, making it promising for a wide range of applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2011
·
IF 4.269
Jun Zhou,Xiuying Qiao,Bernard P. Binks,Kang Sun,Mingwen Bai,Yunlong Li,Yi Liu
Superparamagnetic Fe3O4 nanoparticles prepared by a classical coprecipitation method were used as the stabilizer to prepare magnetic Pickering emulsions, and the effects of particle concentration, oil/water volume ratio, and oil polarity on the type, stability, composition, and morphology of these functional emulsions were investigated. The three-phase contact angle (θow) of the Fe3O4 nanoparticles at the oil−water interface was evaluated using the Washburn method, and the results showed that for nonpolar and weakly polar oils of dodecane and silicone, θow is close to 90°, whereas for strongly polar oils of butyl butyrate and 1-decanol, θow is far below 90°. Inherently hydrophilic Fe3O4 nanoparticles can be used to prepare stable dodecane−water and silicone−water emulsions, but they cannot stabilize butyl butyrate−water and decanol−water mixtures with macroscopic phase separation occurring, which is in good agreement with the contact angle data. Emulsions are of the oil-in-water type for both dodecane and silicone oil, and the average droplet size increases with an increase in the oil volume fraction. For stable emulsions, not all of the particles are adsorbed to drop interfaces; the fraction adsorbed decreases with an increase in the initial oil volume fraction. Changes in the particle concentration have no obvious influence on the stability of these emulsions, even though the droplet size decreases with concentration.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Cheng-Lu Liang,Yang Liu,Rui-Ying Bao,Yong Luo,Wei Yang,Bang-Hu Xie,Ming-Bo Yang
Well dispersed Fe 3 O 4 nanoparticle suspensions with grain size of about 9 nm were coprecipitated and then compounded with different amount of GO (graphite oxide) followed by reduction of GO to obtain Fe 3 O 4 /rGO (reduced graphite oxide) composites with different component ratios. The as-obtained Fe 3 O 4 /rGO composites were used as anode materials for lithium ion batteries to investigate the best component ratio of the composite for the cycling performance. Fe 3 O 4 /rGO composite electrode containing 44.9 wt% Fe 3 O 4 displayed the best cycling capacity of above 300 mA h g −1 at 1000 mA g −1 after 100 cycles and it was interesting to find that the trend of impedance spectra of Fe 3 O 4 /rGO electrodes after some cycles of electrochemical reactions can be well related to the overall cycling performances.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Xiahong Shi,Xiaoting Zhang,Wei Gao,Yalin Zhang,Defu He
Microplastics (MPs) have been widely detected in aquatic environments, and become emerging contaminants of growing concern. It is urgently needed to explore how to effectively remove MPs from water. This study first established an alternative method of removing MPs by magnetic nano-Fe 3 O 4 . Results showed that 1.3 g·L −1 nano-Fe 3 O 4 and 150 min treatments caused optimal magnetization of MPs via surface absorption. Then, magnetized MPs in water can be conveniently removed by suction of the magnet. The average removal rate of four common types of MPs including polyethylene, polypropylene , polystyrene and polyethylene terephthalate in size of approximately 200–900 μm was 86.87 ± 6.92%, 85.05 ± 4.70%, 86.11 ± 6.21%, and 62.83 ± 8.34%, respectively. The removal rate varied among polymer- and size-different MPs, and was positively related to the density of nano-Fe 3 O 4 absorbed on MP surfaces. In addition, the removal rate of MPs in artificial seawater was relatively high in comparison to pure water. Furthermore, the established approach was effectively applied to remove MPs in environmental water bodies including river water, domestic sewage, and natural seawater, with the removal rate of higher than 80%. Altogether, this study provided a novel and simple removal approach to remove MPs in water, which has a certain application prospect.
研究领域:
环境科学
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材料科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 5
·2644-2649
·
IF 3.108
Guodong Wei,Lin Wei,Dong Wang,Yufeng Tian,Yanxue Chen,Shishen Yan,Liangmo Mei,Jun Jiao
In this report, a reversible control of Fe3O4 saturated magnetization by Li ions is demonstrated. A miniature Li ion battery (LIB) was assembled using a Fe3O4 nanoparticle layer as the active cathode. A stable magnetism modulation is realized by a nondestructive electrochemical process in which the lithium insertion results in a valence change and partial redistribution of Fe cations in the crystal structure. The relation between the discharge voltage and the chemical phases were studied by ex situ X-ray diffraction and magnetic measurement. In a suitable discharge potential range, a reversible control of Fe3O4 saturated magnetization was obtained without structural damage to the magnetic electrode. The experimental results indicate by further optimizing the LIB's performance, a large reversible change in magnetization could be realized at room temperature, suggesting the potential for future practical applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 22
·10857-10865
·
IF 3.3
Jinglin Zhu,Meng Zhu,Juanjuan Peng
Developing highly active Fenton-like materials for the decontamination of water is a hot topic. Nanosized Fe3O4 particles are green catalysts for environmental remediation, but their application is limited by their low catalytic activity. Herein, Fe3O4 rhombic dodecahedral nanoparticles (Fe3O4-R) with exposed {110} facets were synthesized via the solvothermal method and used as a Fenton-like catalyst for the degradation of bisphenol A (BPA). Consequently, ∼100% of BPA was removed using Fe3O4-R/H2O2 at pH = 5.0, which was higher than that by commercial Fe3O4. Multiple experiments confirmed the presence of abundant Fe(II) active sites on the surface of Fe3O4-R, but they were unstable, resulting in the dissolution of Fe(II) from the solid surface via oxidation, and thus the homogeneous reaction was not negligible in the Fe3O4-R/H2O2 process. However, hydroxyl radicals (HO˙) were still the primary reactive species, playing a dominant role in the removal of BPA. Consequently, the degradation of BPA was easily disturbed by HCO3− and natural organic matter (NOM). Unfortunately, the inactivation of Fe3O4-R was observed in cycle experiments, which is ascribed to the stabilization of the surface of Fe3O4-R during the oxidation process, reducing the surface active sites of Fe(II). Therefore, this study provides new insight into the Fenton-like oxidation process for the degradation of pollutants by regulating the morphology of Fe3O4 nanoparticles.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2011
·
IF 3.068
Jun Zhou,Lijun Wang,Xiuying Qiao,Bernard P. Binks,Kang Sun
Unmodified Fe 3 O 4 nanoparticles do not stabilize Pickering emulsions of a polar oil like butyl butyrate. In order to obtain stable emulsions, the Fe 3 O 4 nanoparticles were modified by either carboxylic acid (RCOOH) or silane coupling agents (RSi(OC 2 H 5 ) 3 ) to increase their hydrophobicity. The influence of such surface modification on the stability of the resultant Pickering emulsions was investigated in detail for both a non-polar oil (dodecane) and butyl butyrate in mixtures with water. The stability of dodecane-in-water emulsions in the presence of carboxylic acid-coated particles decreases as the length of the alkyl group (R) and the coating extent increase. However, such particles are incapable of stabilizing butyl butyrate-water emulsions even when the carboxylic acid length is decreased to two. However, the silane-coated Fe 3 O 4 nanoparticles can stabilize butyl butyrate-in-water emulsions, and they also increase the stability of dodecane-in-water emulsions. Thermal gravimetric analysis indicates that the molar quantity of silane reagent is much higher than that of carboxylic acid on nanoparticle surfaces after modification, raising their hydrophobicity and enabling enhanced stability of the resultant polar oil–water emulsions.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
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
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuling Chen,Tian Gao,Ying Ren,Changjiang Xiao
The demand for high-performance electromagnetic wave absorbent materials continues to grow with advancing technology. This study reports the synthesis of Bi 2 Fe 4 O 9 /Fe 3 O 4 nanoflower to enhance electromagnetic wave absorption. Bi 2 Fe 4 O 9 , synthesized via a hydrothermal method, was composited with different content Fe 3 O 4 nanocrystals. The strong binding between sheets of nanoflowers provides large surface area and active sites for electromagnetic wave absorption (EMA). The combination of Bi 2 Fe 4 O 9 and Fe 3 O 4 markedly enhanced the dielectric and magnetic properties, resulting in exceptional EMA performance. The sample achieved a minimum reflection loss (RL min ) of −75 dB at 7.0 GHz with a thickness of just 2.5 mm, along with a maximum effective absorption bandwidth (EABW) of 9.2 GHz. The broadband and strong absorption on electromagnetic wave is attributed to the synergistic effects of ferroelectric properties from Bi 2 Fe 4 O 9 and spinel structure of Fe 3 O 4 , supported by strong dipole coupling, interfacial polarization, and high-spin states of Fe ions. The underlying mechanism is thoroughly discussed, and the results demonstrate superior performance compared to similar studies in the field.
研究领域:
材料科学
·
电磁学
✓ 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）