JOURNAL OF CHEMICAL RESEARCH
·
2024
·
IF 1
Liyuan Zhang,Xuewen Bai,Kai Zou,Linlin Zhu
Magnetic polymer microspheres have attracted a great deal of attention due to their magnetic properties and good biocompatibility. In this study, novel magnetic cross-linked poly(divinylbenzene-co-acrylic acid) microspheres were successfully prepared via improved emulsion polymerization. The microstructures of nanocomposites were characterized using scanning electron microscopy, transmission electron microscope, energy-dispersive X-ray spectrometry, X-ray diffraction, and saturation magnetization measurements. It was noteworthy that the nanocomposites displayed good water dispersibility, a rapid absorption rate, a high absorption capacity, and high magnetic separability, results that are promising in terms of these nanocomposites’ future application in biomedical fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Xin Tian,Zhengping Dong,Rou Wang,Jiantai Ma
A highly selective and sensitive method for recognition of Zn 2+ and hydrogen sulfide (H 2 S) in aqueous solution has been developed by using a quinoline fluorescent sensor functionalized magnetic silica nanoparticles ( R1 ). The chemosensor R1 shows excellent fluorescence sensitivity and selectivity toward Zn 2+ and H 2 S in aqueous media , and displays off–on–off type fluorescence change with alternately adding Zn 2+ and H 2 S to the media along with reversible association–dissociation of the complex. Furthermore, the magnetic nanocomposites can be easily separated from solutions by adding an external magnetic field . Finally, using Zn 2+ and H 2 S as inputs and the fluorescence intensity as output, an INHIBIT logic gate can be constructed at the nanoscale level.
研究领域:
分析化学
·
纳米技术
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 7
·1700117
·
IF 4.474
Yanning Qu,Renliang Huang,Wei Qi,Qi Qu,Rongxin Su,Zhimin He
Encapsulation of enzymes with enhanced activity and recyclability in water-in-oil Pickering emulsions is a simple and efficient method for their immobilization; however, the effect produced by the structure of colloidal particles on the stabilization of the Pickering emulsion for enzyme catalysis has not been investigated in detail. In this study, four types of hydrophobic Fe 3 O 4 @SiO 2 nanoparticles (NPs) with similar chemical compositions, particle diameters, but different surface characteristics have been prepared and utilized for enzyme encapsulation in various water-in-oil magnetic Pickering emulsions, after which the relationship between NPs structure, size of emulsions droplets, and enzyme activity is examined. The obtained results indicate that (i) the more hydrophobic Fe 3 O 4 @SiO 2 NPs cause the higher enzyme activity; (ii) the higher hydrophobicity of oil phase also increases the enzyme activity, especially for Fe 3 O 4 @w-SiO 2 NPs which form in the solvent of water. The results are mainly attributed to the higher specific surface area of emulsion droplets and interfacial mass transfer of substrates through the interfaces of droplets. The reported data provide new insights into the mechanism of stabilization of Pickering emulsions for enhancing enzyme activity and demonstrate efficient theoretical references for enzyme immobilization and synthesis of stable and active biocatalysts with high recyclability.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Maosai Zhang,Ye Yang,Wenchuan Guo
In this work, a simple electrochemical sensing platform based on acid-treated Fe 3 O 4 @SiO 2 nanoparticles was successfully prepared for nitrite and sulfite detection. Fe 3 O 4 @SiO 2 nanoparticles were synthesized through the sol–gel and hydrothermal methods. Fe 3 O 4 @SiO 2 presented positive charges after acid treatment, which could enhance the electrostatic attraction between Fe 3 O 4 @SiO 2 and nitrite and sulfite. The Fe 3 O 4 @SiO 2 (acid-treated) modified magnetic glassy carbon electrode (MGCE) was applied to detect nitrite and sulfite using differential pulse voltammetry and cyclic voltammetry. Under optimized conditions, the developed electrochemical sensor presented good analytical properties for nitrite and sulfite detection with detection limits of 3.33 μmol/L and 31.57 μmol/L, respectively. The good recoveries varied from 85.18% to 111.02%, with a relative standard deviation of 0.23–4.80%. Furthermore, the Fe 3 O 4 @SiO 2 (acid-treated) modified MGCE showed better selectivity, reproducibility, and repeatability in nitrite and sulfite detection. Therefore, this proposed electrochemical sensor provides a new method for developing a nitrite and sulfite detection sensor.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jie Min,Wei Song,Tianding Hu,Yunfei Zhi,Zhenhao Xia,Tiecheng Zhang,Shaoyun Shan,Hongying Su
Magnetic nanoparticle-supported heterogeneous catalysts have been widely researched in green catalysis, due to their convenient magnetic separation and nanometer effects. Herein, a magnetic Co(III)-Salen heterogeneous catalyst with uniform spherical core-shell structure was synthesized for the chemical fixation of CO 2 into cyclic carbonate based on the sustainable protocol development and green chemistry principles. Fe 3 O 4 @SiO 2 nanoparticles with uniform spherical core-shell structure were prepared by the reverse microemulsion method, and Co(III)-Salen complexes were subsequently immobilized on the resulted Fe 3 O 4 @SiO 2 nanoparticles via covalent bonding, leading to Fe 3 O 4 @SiO 2 @Co(III)-Salen nanocomposites with particle size of 29 nm and saturation magnetization value of 27.2 emu/g. The catalytic performance study indicated that the catalyst exhibited high yield of 99% with selectivity of 100% for the ring-opening addition reaction of CO 2 and epoxide under solvent-free reaction condition. A plausible reaction mechanism was proposed that the Lewis acidic sites of Co(III)-Salen and nucleophilic bromine ion components played synergetic roles in promoting cycloaddition reactions. A stable geometry of the Co(III)-Salen complex and a detailed evidence for the reaction mechanism were provided by the density functional theory (DFT) calculations. Based on their excellent magnetic properties , the Co(III)-Salen nanocomposites could be easily recovered by using an external magnet and reused for 5 times without significant leaching of metal center and loss of catalytic activity.
研究领域:
材料科学
·
绿色化学
·
催化反应
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 20
·9905-9912
·
IF 3.3
Jun Tian,Yi Pang,Hongjuan Gu,Dongyan Tang,Zaiqian Yu
Nanoscale molecularly imprinted polymers (MIPs) could offer high binding capacity and fast mass transfer, but their removal after adsorption is costly and time-consuming. In this paper, Fe3O4@SiO2 nanoparticles were synthesized and a lysozyme-imprinted polymer was synthesized via surface initiated atom transfer polymerization on the surface of Fe3O4@SiO2. Temperature-controlled adsorption and desorption of lysozyme were measured, and the adsorption kinetics and isothermal adsorption were determined. The results indicate that the synthesized Fe3O4 has an inverse spinel crystalline structure and Fe3O4@SiO2 is a core–shell structured nanoparticle. The adsorption kinetics followed the Langmuir EXT1 model, and the equilibrium adsorption capacity of the Fe3O4@SiO2@MIP at 40 °C was 117.12 mg g−1 with an imprinting factor of 1.51. SDS-PAGE electrophoresis confirmed the specific adsorption of lysozyme, and 86% of the adsorbed lysozyme could be released by changing the temperature.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Xianfei Zeng,Yang Zhou,Wenhui Ma,Shixing Wang,Keqiang Xie,Jijun Wu,Kuixian Wei
Di(2-picolyl)amine derivates functionalized inorganic/organic hybrid magnetic network was prepared for selective detection and removal of Zn (II). A significant visual color change from colorless to pink-red was observed under the irradiation of 365 nm UV lamp. The inorganic/organic hybrid Fe 3 O 4 @SiO 2 nanoparticles were characterized by TEM, XRD, VSM, FT-IR, and TGA techniques. The fluorescence photograph showed that di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 nanoparticles were sensitive and selective to Zn 2+ in acetonitrile solution. The di(2-picolyl)amine functionalized Fe 3 O 4 @SiO 2 nanoparticles with high saturation magnetization can conveniently separate metal ions from aqueous solution. Fluorescence spectra showed that the intensity varied obviously with the concentration of Zn 2+ . The removal efficiency of Zn 2+ can reach as high as 97.1% and the saturated adsorption amount of Zn 2+ is 161.6 mg/g. Langmuir linear fitting can illustrate the well consistent with the adsorption results.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Wen-Lin Wang,Li-Long Gao,Hai-Lin Cong,Bing Yu,Chun-Bo Mou
Magnetic polyurea microspheres (MPUMs) were prepared by one-step precipitation polymerization of isophorone diisocyanate (IPDI) with water in the mixed solvent of water and acetone. Pre-prepared monodisperse and magnetic Fe3O4@SiO2 nanoparticles were added before polymerization. Then the surface morphologies of MPUMS were characterized by scanning electron microscopy (SEM). MPUMs exhibit good recycling stability assisted by the convenient magnetic separation. Therefore, MPUMs can serve as a promising carrier candidate for adsorption of dyes and treating sewage.
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
ChemMedChem
·
2017
·Vol. 12
·期 19
·1600-1609
·
IF 3.225
Xinyu Hu,Yongmei Wang,Liangliang Zhang,Man Xu,Jianfa Zhang,Wei Dong
Graphical The power of attraction : Salecan-based composite hydrogels have magnetic-field-responsive properties due to the introduction of Fe 3 O 4 @SiO 2 nanoparticles into the hydrogel system. As a model anticancer drug, doxorubicin (DOX) was loaded into the composite hydrogels with high efficiency via strong electrostatic interactions between the amine group in DOX and carboxyl groups present in the hydrogels. These DOX-loaded salecan-g-PPH/Fe 3 O 4 @SiO 2 composite hydrogels show pH-responsive controlled drug release, and the liberated DOX can be effectively taken up by A549 cells. Salecan is a water-soluble extracellular β-glucan and has excellent physicochemical and biological properties for hydrogel preparation. In this study, a new pH/magnetic field dual-responsive hydrogel was prepared by the graft copolymerization of salecan with 4-pentenoic acid (PA) and N -hydroxyethylacrylamide (HEAA) in the presence of Fe 3 O 4 @SiO 2 nanoparticles for doxorubicin hydrochloride (DOX) release. Integration of Fe 3 O 4 @SiO 2 nanoparticles in salecan-g-poly(PA-co-HEAA) copolymers afforded magnetic sensitivity to the original material. DOX-loaded hydrogels exhibited a clear capacity for pH/magnetic field dual-responsive controlled drug release. Lowering the pH to acidic conditions or introducing an external magnetic field caused an enhancement in DOX release. This salecan-g-poly(PA-co-HEAA)/Fe 3 O 4 @SiO 2 composite hydrogel is a promising drug carrier for magnetically targeted drug delivery with enhanced DOX cytotoxicity against A549 cells.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Xiongfei Liu,Yi Zhang,Yongling Guo,Xiaozhong Wang
In this study, the focus is on enhancing the microwave absorption performance of magnesium phosphate cement (MPC) by incorporating Fe 3 O 4 @SiO 2 nanocomposites . The resulting MPC, fortified with hollow glass microspheres (HGM) and Fe 3 O 4 @SiO 2 , demonstrates remarkable improvements in absorption efficiency, rapid hardening, early strength , and bonding properties. Through thorough characterization using SEM, XRD, FTIR, and XPS, the uniform distribution and morphology of the Fe 3 O 4 @SiO 2 nanocomposites within the MPC matrix are confirmed. Compared to MPC treated solely with Fe 3 O 4 , the modified MPC shows a 104% increase in absorption peak value with a bandwidth of 1.20 GHz (<10 dB). The addition of SiO 2 promotes the hydration process of Fe 3 O 4 @SiO 2 within MPC, forming a uniform absorption network that enhances electromagnetic absorption efficiency. Moreover, the synergistic effects of impedance matching, multiple scattering, and interfacial polarization contribute to further enhancing microwave absorption performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jia Deng,Shaoge Fu,Yifan Zhong,Ming Jiang,Tao Chen,Haili Zhao
Photonic crystal (PC) hydrogels with unique micro/nanostructures have excellent prospects in many fields, such as sensing, displays, anticounterfeiting, information encryption, and adaptive camouflage. Herein, magnetic core–shell Fe3O4/SiO2 nanoparticles with a controlled size were synthesized, followed by PC hydrogels of arbitrary structures that were fabricated via the magnetically inducing self-assembly of magnetic nanoparticles in the poly(ethylene glycol) diacrylate (PEGDA) pregel solution and a subsequent digital micromirror device (DMD)-based UV polymerization process. By controlling the size of nanoparticles and magnetic field intensity, various PC hydrogel patterns with tunable structural colors were fabricated. Combining magnetic field control with DMD-based light modulation, high-throughput preparation of structural color PC hydrogels was achieved. Furthermore, the Fe3O4/SiO2 nanoparticles were assembled into poly(2-hydroxyethyl methacrylate) (PHEMA) with solvent responsiveness. Interestingly, the obtained PC hydrogels could swell in ethanol, resulting in a change in the structural color. Meaningfully, a dual-component PC hydrogel consisting of a PEGDA pattern and a PHEMA background was fabricated, and the invisible pattern in the initial state could be displayed and hidden through cyclic exposure to ethanol and ethylene glycol. The presented strategy for constructing the PC hydrogels from Fe3O4/SiO2 nanoparticles could provide valuable insights for the development of intelligent structural color materials, which exhibit significant potential in applications such as information storage, visual sensing, and anticounterfeiting.
研究领域:
材料科学
·
纳米技术
·
光学
·
化学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yuqi Zhuang,Sinuo Li,Eldon R. Rene,Shuoyu Dong,Weifang Ma
Porous organic polymers (POPs) present superior adsorption performance to steroid endocrine disruptors . However, the effective recovery and high cost have been a big limitation for their large-scale applications. Herein, magnetic azo-linked porous polymers (Fe 3 O 4 @SiO 2 /ALP-p) were designed and prepared in a green synthesis approach using low-price materials from phloroglucinol and pararosaniline via a diazo-coupling reaction under standard temperature and pressure conditions, which embedded with Fe 3 O 4 @SiO 2 nanoparticles to form three-dimensional interlayer network structure with flexible-rigid interweaving. The saturated adsorption capacity to bisphenol-A (BPA) was 485.09 mg/g at 298 K, which increased by 1.4 times compared with ALP-p of relatively smaller mass density. This enhanced adsorption was ascribed to increment from surface adsorption and pore filling with 2.3 times of specific surface area and 2.6 times of pore volume, although the total organic functional groups decreased with Fe 3 O 4 @SiO 2 amendment. Also, the adsorption rate increased by about 1.1 and 1.5-fold due to enhancement in the initial stage of surface adsorption and subsequent stage pore diffusion, respectively. Moreover, this adsorbent could be used in broad pH (3.0–7.0) and salinity adaptability (<0.5 mol/L). The loss of adsorption capacity and magnetic recovery were lower than 1.1% and 0.8% in each operation cycle because of the flexible-rigid interweave . This excellent performance was contributed by synergistic effects from physisorption and chemisorption , such as pore filling, electrostatic attraction, π–π stacking, hydrogen bonding, and hydrophobic interaction. This study offered a cost-effective, high-performing, and ecologically friendly material along with a green preparation method.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）