RSC Advances
·
2022
·Vol. 12
·期 21
·13251-13260
·
IF 4.036
Xinglong Li,Mingming Li,Yuxin Liu,Yisi Feng,Pan Pan
5-Hydroxymethylfurfural (HMF) is one of the most important platform molecules and could be transformed into a variety of fuel additives and high value-added chemicals. Multiple catalyst systems have been developed for the conversion of carbohydrates to HMF, but there are still unavoidable problems, including high temperature and pressure, difficult recovery of solvent, corrosion of equipment, poor catalyst circulation, etc. Herein, a new magnetic Fe3O4@SiO2@mSiO2-TaOPO4 catalyst for the preparation of HMF from fructose in 2-pentanol was developed. The structures of the catalysts were characterized by FT-IR, TSM, EDS, SEM, XRD and VSM. The 2-pentanol solvent is not only conducive to the production of HMF, but also enables the reaction to be carried out at a lower pressure. The highest yield of HMF (85.4%) was obtained using 20 wt% catalyst under 10% substrate concentration (0.5 g of fructose) at 120 °C for 3 h. The catalysts can be easily separated by magnetism. The slight decrease in catalyst activity after 7 cycles was mainly due to the loss of catalyst during the cycle operation. Simultaneously, the total yield of HMF was 51.3% after scale-up to 15 g of fructose, showing the possible industrial application potential of this catalyst system.
研究领域:
化学工程
·
催化材料
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DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 12
·1978
·
IF 2.972
Wei Sun,Shaowen Huang,Siyu Zhang,Qi Luo
Nanomaterials extensively studied by nanotechnology scientists have been extensively applied in biomedicine, chemistry, physics and other fields nowadays. Magnetic nanoparticles, surpassing nano applications, are found to possess many advantages over nonmagnetic nanomaterials. Graphene oxide (GO), in particular, draws growing scholarly attention due to its large surface area, good water solubility and biocompatibility, rich surface functional group and easy-to-modify property. In this paper, we modify the Polyethylene mide (PEI) molecule on the surface of GO to increase its biocompatibility. The Au-Fe3O4nanoparticles and folic acid molecules on the ligand make the resulting composite applicable both in magnetic resonance imaging and in cancer cell targeting. In addition, the π-π accumulation of doxorubicin used to load the anticancer drug can release the drug under the acid condition of the cancer cells, detect the cancer cells by fluorescence and realize the multi-mode detection of cancer cells.Keywords:graphene oxide;Au-Fe3O4nanoparticles;targeting cancer cells;drug delivery
研究领域:
生物医学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 23
·10018-10025
·
IF 1.821
Junxia Guo,Yuzhi Wang,Yanjin Liu,Yigang Zhou
A surface molecularly imprinted polymer (MIP-Fe3O4@AA) was prepared on a magnetic material (Fe3O4@AA) surface for the selective recognition and adsorption of bovine hemoglobin (BHb). The acrylic acid (AA) monomer was directly grafted to the surface of Fe3O4 through a simple coordination reaction between the carboxyl group of AA and unsaturated iron ions (Fe3O4@AA). Then the composite of MIP-Fe3O4@AA based on BHb was successfully synthesized by the surface grafting copolymerization method. The amounts of raw materials were optimized. The characteristics of the obtained MIP-Fe3O4@AA were determined by Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA). The adsorption capacity of MIP-Fe3O4@AA was evaluated and well fitted by the Langmuir model. The maximum theoretical adsorption capacity (Qmax) was calculated to be 117.27 mg g−1 for MIP-Fe3O4@AA. The selectivity experiment showed that the MIP-Fe3O4@AA had an outstanding selectivity toward the template protein (BHb) with an imprinting factor of 4.43. The MIP-Fe3O4@AA was also used to capture BHb from the protein mixture and real sample with satisfactory results, which demonstrated its potential practical analytical performance.
研究领域:
材料科学
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生物技术
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分析化学
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产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Hongting Ye,Xiaoxing Zeng,Fei Feng,Yuanhang Li,Xiaofeng Gong
ABSTRACT In this study, novel recyclable composite BiOBr/chitin-Fe 3 O 4 was synthesized by a solvothermal method using magnetic chitin chelating bismuth oxybromide (BiOBr) as precursor. The morphology, structure, photoelectric properties and chemical composition of the obtained samples were explored extensively by various characterization techniques. Due to the introduction of Fe 3 O 4 and chitin, the composite BiOBr/chitin-Fe 3 O 4 has multi-functions in enlarging photo response performance, reducing the band gap, increasing specific surface area and inhibiting recombination rate, which are essential to improve the photocatalytic efficiency. Using ciprofloxacin as target pollutant, the composite showed excellent photocatalytic performance under visible light irradiation, the apparent rate constant value of BiOBr/chitin-Fe 3 O 4 is 5.8 times higher than that of pure BiOBr. The composite BiOBr/chitin-Fe 3 O 4 could be recycled and reused conveniently and effectively, and the catalyst possessed good photocatalytic stability with the degradation efficiency remaining unchanged even after five times circle. The possible degradation mechanism was discussed on the basis of experiments.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 14
·18741-18750
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IF 2.478
Qin Ruifei,Liu Lina
Multifunctional Fe 3 O 4 /Eu(DBM) 3 phen/PVP ((DBM: dibenzoylmethane, phen: 1,10-phenanthroline, PVP: polyvinyl pyrrolidone) microfibers were constructed by simple electrospinning process. The structure and morphology of the microfibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The diameters of pure PVP microfibers and the microfibers doped only with Fe 3 O 4 nanoparticles (NPs) were uniformly distributed, with an average diameter of about 360 nm. When 3% Eu(DBM) 3 phen complex and Fe 3 O 4 NPs were both added to the precursor for electrospinning, the microfibers became very inhomogeneous in diameter. The photoluminescent properties of pure Eu(DBM) 3 phen complex and composite microfibers were also studied. The characteristic emission peaks of Eu 3+ appeared in the composite microfibers. The intensities of emission and excitation spectra gradually decrease with adding more Fe 3 O 4 NPs. The unit mass of the pure europium complex in some composite microfibers gave stronger luminescence than the pure europium complex. The fluorescence lifetime of 5 D 0 state in the composite microfibers is longer than that of pure europium complex. Additionally, the magnetic properties of Fe 3 O 4 NPs and the composite microfibers were investigated. The saturation magnetization of the composite microfibers was smaller than that of pure Fe 3 O 4 NPs.
研究领域:
材料科学
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纳米技术
·
光学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2023
·
IF 8
Yunsheng Da,Qiang Liu,Ling Kong,Yiming Du,Xingyou Tian,Yanyan Liu,Hua Wang
In this work, a high-performance electromagnetic interference (EMI) latent curing epoxy composites with combination of modified Fe 3 O 4 and carboxylic carbon nanotube (CNTs) were prepared by magnetic orientation. The unique heterogeneous interface among magnetic nanoparticles and conductive nanowires facilitates the loss of interface polarization, the wave absorbance and the dipole polarization, makes EMI SE T of the material reach respectively 45.86 dB in X-band at the thickness of 2 mm ± 0.1 mm, significantly exceeding that of other epoxy-based shielding materials. In addition, the composites show excellent thermal capacity reaching 1.59 W/m·K. What's more, the oriented epoxy mixture can be preserved at room temperature for 40 days maintaining a low viscosity state without curing, which has a strong practical application prospect in the field of electronic packaging materials.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 1
·370-376
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IF 1.483
Xia Guo-Hua,Liu Wei,Jiang Xiao-Ping,Wang Xiang-Yu,Zhang Ye-Wang,Guo Jianyong
Magnetic Fe3O4 nanoparticles were prepared through hydrothermal method and coated with silica on the surface to obtain Fe3O4@SiO2 core–shell nanoparticles. After modification with different functional groups including aldehyde,
amine and diimide, the nanoparticles were used as carrier for covalent immobilization of lipase. The nanoparticles with aldehyde groups showed highest immobilization yield (52.8%) and efficiency (86.5%). And the immobilization conditions including pH, temperature and the concentration of enzyme
were optimized. After immobilization, the K
m of lipase was altered from 2.3 to 3.2 mM. The thermal stability and pH stability were enhanced by immobilization at the investigated conditions: pH 5.0–8.0 and temperature 30–70 °C. After 10 batches conversion of
4-Nitrophenyl palmitate into p-Nitrophenol, the immobilized lipase retained over 75% of the original activity. Compared with the commercial lipase Novozym435, the immobilized lipase showed better stability and higher catalytic efficiency. These results demonstrate that the immobilized lipase
on the modified Fe3O4@SiO2 magnetic nanoparticles has enhanced stability and reusability, which make lipase of potential interest in a number of industrial applications.
研究领域:
生物化学
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纳米材料科学
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Liang Bao,Chengkun Wang,Yaoming Zhang,Shoubing Chen,Liming Tao,Lihe Guo,Rui Yang,Peng Liu,Qihua Wang,Tingmei Wang
Magnetic PAO10@PSF/Fe 3 O 4 microcapsules (MMCs), loaded with PAO10, were prepared by solvent evaporation method using PFOTES/Fe 3 O 4 particles stabilized oil-in-water emulsion as template, and embedded into epoxy (EP) to prepare self-lubricating composites. Further, the tribological properties of the MMCs were analyzed, and the wear mechanism were discussed in detail. When the content of microcapsules was 20 wt%, compared with pure epoxy resin, the friction coefficient (COF) and wear rate of epoxy/magnetic microcapsule composites (EP/MMCs) decreased by 91.2 % and 92.9 %, respectively, primarily attributed to the formation of lubricating oil film during friction, and the internal lubricating oil and the Fe 3 O 4 nanoparticles on the shell were formed a coordinated solid-liquid lubrication effect. During the preparation of EP/MMCs, MMCs could respond to the external magnetic field, the distribution of the microcapsules in the composites could be controlled by the magnetic field, thereby affecting the tribological properties of the composites at different positions. In addition, the composite material had light stimulation response performance. Under the irradiation of near-infrared (NIR) light, the friction coefficient of EP/MMCs decreased rapidly and responded quickly. This study provides a high-performance friction material, which is expected to regulate the tribological properties of the material according to external stimuli to achieve intelligent lubrication.
研究领域:
材料科学
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摩擦学
·
智能材料
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产品关联
DOI
高影响因子
ChemPlusChem
·
2023
·Vol. 88
·期 7
·e202300247
·
IF 3.4
Libao Han,Minghuo Wu,Yufeng Hu
Graphical A colorimetric detection method based on Fe 3 O 4 /SnS 2 composites was established for the detection and discrimination of ten phenols for the first time. The incorporation of the photo catalyst SnS 2 significantly improved the peroxidase-like activity of Fe 3 O 4 , leading to an enhancing efficiency of the colorimetric detection method. The developed method could rapidly determine the total phenols in real water samples. Phenols pose a great threat to human and environment due to their high toxicity and low bio-degradability. Therefore, the development of a rapid and sensitive detection method for multiple phenols is of great importance. Here, a colorimetric detection method based on Fe 3 O 4 /SnS 2 composites was established for the detection and discrimination of ten phenols for the first time. The results demonstrated that the incorporation of the photo catalyst SnS 2 significantly improved the peroxidase-like activity of Fe 3 O 4 , leading to an enhancing efficiency of the colorimetric detection method. The developed method was capable of detecting phenol within a concentration range of 0.5–2000 μM, with detection limit as low as 0.06 μM. This method was successfully applied to detect total phenols in samples obtained from two sewage treatment plants and seawater. Furthermore, by employing principal component analysis, the established colorimetric method enabled the simultaneous discrimination of all ten phenols. The performance was further evaluated by accurately identifying binary or ternary mixtures of phenols, and even identifying the type of phenol in 10 unknown samples containing one of the ten phenols. These findings highlight the potential of the Fe 3 O 4 /SnS 2 composite as a promising candidate for the simultaneous detection of multiple phenols in liquid samples.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Kejia Zhou,Junfu Li,Wangming Li,Yudong Zhang,Kuangbing Wang,Xinyi Xiong,Shijiao Li,Xiaoyang Chen,Hsien-wei Cheng,Jingjiang Qiu,Ronghan Wei
Core–shell microspheres refer to duo-layer or multilayer microspheres, which are widely used in drug delivery, microreactors, etc. Accurate manipulation of microspheres is a research hot spot, while traditional manipulation methods including ultrasonic manipulation and laser manipulation still face some limitations. In this study, magnetic core–shell microspheres were adopted to realize the accurate manipulation of microspheres. Combined with microfluidic technology, polystyrene sulfonic acid (PSSA)/Fe3O4 magnetic fluid was utilized as the core material and photosensitive acrylic resin became the shell material. After UV curing, a magnetic core–shell microsphere with an average size of 55 μm could be achieved, and the diameter was uniform and controllable. By adjusting the flow rate of the dispersed phase, the dual-core microspheres with different core particle sizes that ranged from 9.3 to 28.4 μm could be prepared. Experimental results showed that the prepared Fe3O4/acrylic resin core–shell microspheres can be used as functionalized microspheres that have good magnetic response properties and self-assembly ability. In addition, the magnetic manipulation and self-assembly of the prepared core–shell microspheres were presented with different external magnetic fields. The magnetic core–shell microspheres have shown great potential in the fields of biomedical engineering and targeted delivery of drugs.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ye Xu,Qiyuan Gui,Xiaoling Peng,Jing Li,Shan Tao,Jingcai Xu,Bo Hong,Xinqing Wang
This study reports on the synthesis and electromagnetic wave-absorbing properties of Ag/Fe 3 O 4 /SiO 2 under various magnetic field intensities. The nanocomposites were prepared via a solvothermal method followed by a Stober proces, during which uniform magnetic fields were applied to induce the formation of one-dimensional nanochain structures. Results indicate that the Ag/Fe 3 O 4 /SiO 2 exhibit enhanced wave-absorbing capabilities under strong magnetic fields. Specifically, at a magnetic field of 600 mT, the composite achieves a minimum reflection loss value of −48.61 dB, accompanied by a broad effective absorption bandwidth. Furthermore, the microwave absorption performance of samples oriented horizontally along the circumference surface during preparation shows a significant improvement compared to non-oriented samples. It is attributed to the optimized electromagnetic wave transmission pathways and improved electrical conductivity and magnetic loss capabilities facilitated by the nanochain structures. Specifically, the nanochains effectively lengthen the wave propagation distance, promote charge migration, and intensify natural and exchange resonance effects. This research not only broadens the design paradigm for electromagnetic wave-absorbing materials but also offers novel strategies for their development.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2020
·Vol. 93
·期 9
·1399-1411
·
IF 0.69
Sun Li,Wu Xiaohong,Zhou Youning,Wang Chunpu,Meng Zhonghua,He Jian
Abstract The halloysite-iron oxide (Fe 3 O 4 –HNTs) hybrid material is prepared using a halloysite nanotube as precursor, and the Fe 3 O 4 is immobilized on the halloysite with subsequent modification using 3-aminopropyltriethoxysilane. The influence of pH, urea hydrolysis, and the concentration of ferric chloride, polyvinyl alcohol on the synthesis of Fe 3 O 4 –HNTs hybrid materials were investigated. FT-IR was used to understand the modification of surface functionality, while the surface morphology and surface heteroatom were investigated through SEM and XPS, respectively. The phase purity of the hybrid material was studied using XRD pattern. The investigation demonstrated that the dispersion of Fe 3 O 4 –HNTs composite in epoxy resin is better than HNTs, and a significance improvement in corrosion resistance of epoxy coatings (EP) was observed. Moreover, an attempt was made to understand the mechanism of Fe 3 O 4 –HNTs/epoxy coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
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