COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Wen Xue,Yang Hu,Fujun Wang,Xudong Yang,Lu Wang
High specific-surface-area porous poly(caprolactone) (PCL) membranes combined with Fe 3 O 4 nanoparticles were fabricated by electrospinning technology. Their applications as catalysts in Fenton reactions to degrade methylene blue (MB) were evaluated in the presence of H 2 O 2 and UV light . The results indicated that the fibrous catalyst system illustrated efficient MB removal performance (99% of MB degradation rate) and was viable after 6 cycles (96% of MB degradation rate). Besides, the morphology, chemical composition , magnetic and mechanical properties were also accessed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, magnetometry , and strain-stress curves. The outstanding catalytic behaviors of the composites are attributed to synergy of porous surface and embedded Fe 3 O 4 nanoparticles. It also shows advantages of being environment-friendly and separated easily without an external magnetic field.
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2018
·
IF 4.432
Huanhuan Wu,Keman Cheng,Yuan He,Ziyang Li,Huiling Su,Xiuming Zhang,Yanan Sun,Wei Shi,Dongtao Ge
Multifunctional nanoplatforms have attracted the interests of many scientists because they can achieve better therapeutic effect in the combined treatment of cancer. A novel cancer therapeutic strategy which combines an Fe3O4-based in vivo Fenton reaction with polypyrrole (PPy)-based photothermal therapy (PTT) was proposed. The multifunctional nanocomposite was comprised of Fe3O4 as the core, PPy as the shell, and polyethylene glycol. PPy could absorb near-infrared (NIR) light strongly and convert it into heat for tumor photothermal ablation, and Fe3O4 NPs were used as a target component to guide the nanoparticles to the tumor site under an external magnetic field. It was found that the PPy coating could be used not only for inducing PTT to ablate tumor cells but also for promoting Fe2+/3+ release from Fe3O4 nanoparticles. In vitro cell experiments confirmed that the increased Fe2+/3+ release could effectively enhance the Fe3O4-based Fenton reaction, which catalyzed the conversion of H2O2 into a highly toxic hydroxyl radical (•OH), thus inducing tumor cell apoptosis. Furthermore, our experiments also showed that the PPy coating could generate a photothermal effect to kill 4T1 tumor cells under NIR light exposure but did no harm to normal cells in the dark. Under the guidance of the magnet, we found Fe3O4@PPy-PEG (Fe3O4@P–P) nanoparticles could effectively enrich in the tumor site, and the therapeutic effect from PTT and the photothermal strengthened Fenton reaction was also verified in vivo. It is confirmed for the first time that the photothermal effect could promote the release of iron ions from Fe3O4 under acid conditions and enhance the Fenton reaction. Therefore, the Fe3O4@P–P nanoparticles, combined with the Fenton reaction and photothermal effect, and obviously the magnetic targeting and magnetic resonance imaging ability, are able to be a candidate for novel tumor theranostic agents.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2018
·
IF 2.785
Xiaojing Liu,Yangcheng Lu
Solvent exchange is widely used to synthesize magnetic nanoclusters (MNCs). However, it remains a challenge to increase the production and decrease the addition of surfactants, both of which are important for the application and functionalization of MNCs. Herein, we use a rapid and tunable mixing method to control the assembly of Fe 3 O 4 nanoparticles. This method involves shear-mixing in a channel of a T-junction micromixer. Smaller and more monodisperse MNCs were synthesized with less surfactant, when compared with conventional bulk synthesis. Varying the mixing rate and the formula of the magnetic suspension allowed for the flexible adjustment of the nanocluster size while maintaining a uniformly sized MNCs. The flow synthesis and ease of scale-up make this method potentially suitable for broad industrial application.
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2018
·
IF 7.051
Zisheng Zhao,Yaobin Zhang,Yang Li,Xie Quan,Zhiqiang Zhao
Anaerobic digestion is one of the most promising technologies to stabilize waste-activated sludge (WAS) and recover energy. However, the low efficiency of anaerobic digestion of WAS constrains its application. Supplementing zero valent iron (ZVI) and Fe 3 O 4 in digesters could improve the sludge digestion performance, which has recently been extensively studied. However, the mechanisms behind this improvement remain unclear. In this study, the effects of ZVI and Fe 3 O 4 on the four stages of anaerobic digestion of WAS (solubilization, hydrolysis, acidification and methanogenesis) were investigated. Results showed that ZVI had only a slight effect on the solubilization , hydrolysis and acidification processes, while ZVI significantly promoted the hydrogenotrophic methanogenesis , increasing methane production by 70%. Further investigation indicated that coenzyme F420 activity in the ZVI added reactor was 32.3% higher than in the blank. These results indicate that ZVI promoted anaerobic digestion of WAS through promoting hydrogenotrophic methanogenesis. On the other hand, Fe 3 O 4 obviously promoted the solubilization, hydrolysis and acidification of sludge. Vast Fe 2+ was detected in the aqueous phase of the Fe 3 O 4 digester which was a result of dissimilatory iron reduction that can utilize complicated matter as a substrate. This was in agreement with the acceleration of the solubilization, hydrolysis and acidification of the sludge. However, the acetoclastic and hydrogenotrophic methanogenesis with Fe 3 O 4 decreased by 27% and 22% compared to the Fe 3 O 4 -free digester, respectively. Further study indicated that Fe 3 O 4 competed with CH 3 ▪S▪CoM for electrons and thus inhibited the methanogenesis process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Sizhu Tian,Jia Jiang,Shuang Zang,Kun Wang,Yong Yu,Xuwen Li,Hanqi Zhang,Aimin Yu,Ziwei Zhang
A novel electron spin resonance (ESR) spectroscopy method for determination of rabbit IgG was presented. Anti-rabbit IgG antibody was bound to Fe 3 O 4 nanoparticles (FeNPs). The FeNPs were used as probe to give ESR signal . After the optimization of the assay, a molar ratio 500:1 of antibody to FeNPs was selected. The sepharose beads were used as solid phase and used to separate the analyte from the sample solution. Two typical immunoassay formats, sandwich and competitive formats, were applied to the determination of IgG. The analytical sensitivities obtained by sandwich and competitive formats were 0.13 μg mL −1 and 0.56 μg mL −1 , respectively. The two formats were applied to the determination of the rabbit IgG in rabbit serum. The diluted sample was directly analyzed and other additional sample treatment was not required. The analytical results of the spiked samples indicated that the recoveries of the analytes were acceptable. Furthermore, the sample preparation time used in this method is shorter than most existing immunoassay methods .
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Jianfeng Zhang,Qunling Fang,Jinyu Duan,Hongmei Xu,Huajian Xu,Shouhu Xuan
This work reports a novel Fe3O4@polydopamine/Au/polydopamine core/shell nanocomposite toward a magnetically separable nanocatalyst. Because the polydopamine (PDA) layer-sandwiched Au nanocrystals were prepared by a layer-by-layer method, the content of Au could be controlled by varying the Au shell number (such as burger-like Fe3O4@PDA/Au/PDA/Au/PDA). Fe3O4@PDA/Au/PDA exhibited excellent catalytic activity in reducing p-nitrophenol because the substrate could penetrate the PDA shell. Owing to the protection of the PDA shell, Fe3O4@PDA/Au/PDA presented higher cyclability than Fe3O4@PDA/Au. The activity of Fe3O4@PDA/Au/PDA maintained 95% after 7 cycles, while that of Fe3O4@PDA/Au was only 61%. The detailed cycling catalytic mechanism was investigated, and it was found that the catalytic rate of Fe3O4@PDA/Au/PDA/Au/PDA was faster than that of Fe3O4@PDA/Au/PDA because of the higher Au content. Interestingly, this method could be extended for other magnetic nanocomposites with two different kinds of noble metal nanocrystals integrated within one particle, such as Fe3O4@PDA/Au/PDA/Ag/PDA and Fe3O4@PDA/Au/PDA/Pd/PDA.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 2
·260-268
·
IF 1.248
Ren Hejun,Ma Taigang,Zhao Jian,Zhou Rui
A simple and efficient colorimetric biosensing for hydrogen peroxide and glucose with peroxidase-like vitamin C(V c ) functionalized Fe 3 O 4 magnetic nanoparticles(V c Fe 3 O 4 MNPs) as a catalyst is reported. Compared with Fe 3 O 4 MNPs and other catalysts, V c Fe 3 O 4 MNPs exhibited superior catalytic properties. Kinetic studies indicated that vitamin C incorporated on Fe 3 O 4 MNPs improved the affinity toward H 2 O 2 . As low as 0.29 μmol/L H 2 O 2 can be detected with a wide linear range of 0.5―100 μmol/L H 2 O 2 ; moreover, as low as 0.288 μmol/L glucose can be detected with a linear range of 0.5―25 μmol/L glucose. The detection method was highly sensitive in sensing H 2 O 2 and glucose. The robustness of V c Fe 3 O 4 MNPs rendered them suitable for wide ranging applications.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yingqing Zhan,Zhihang Long,Xinyi Wan,Jiemin Zhang,Shuangjiang He,Yi He
To obtain high-performance electromagnetic shielding materials, structure and morphology are two key factors. We here developed an efficient and facial method to prepare high-performance 3D carbon nanofiber mats (CFM)/Fe 3 O 4 hybrid electromagnetic shielding materials. For this purpose, the CFM were chemically modified by mussel-inspired poly-dopamine coating, which were further used as templates for decoration of Fe 3 O 4 nanoparticles via solvothermal route. It was found that the Fe 3 O 4 nano-spheres with diameters of 200–250 nm were uniformly coated on the surface of 3D carbon nanofibers. More importantly, the morphology and structure of resulting 3D carbon nanofiber mats/Fe 3 O 4 hybrids could be easily controlled by altering the experiment parameters, which were examined by FT-IR, XPS, TGA, XRD, SEM, and TEM. The measured magnetic properties showed that saturation magnetism and coercivity increased from 13.4 to 39.7 emu/g and 85.3 to 104.6 Oe, respectively. The lowest reflectivity of resulting hybrid was calculated to be −47 dB at 10.0 GHz (2.5 mm). In addition, the reflectivity of 3D carbon nanofiber mats/Fe 3 O 4 hybrid was less than −25 dB in the range of 7–13 GHz. Moreover, the resulting 3D carbon nanofiber mats/Fe 3 O 4 hybrid exhibited an EMI shielding performance of −62.6 dB in the frequency range of 8.2–12.4 GHz. Therefore, 3D carbon fiber mats/Fe 3 O 4 hybrids can be ideal EMI materials with strong absorption, low density, and wide absorption range.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 17
·2421-2429
·
IF 3.304
Xiaojun Wei,Lihong Jing,Chunyan Liu,Yi Hou,Mingxia Jiao,Mingyuan Gao
Herein, a polyol method has been explored for producing magnetic iron oxide nanoparticle clusters that are potentially useful as contrast agents for magnetic resonance imaging (MRI), as drug carriers in tumor therapy, and for bioseparation. The oriented attachment growth of primary particles is widely accepted as a major driving force for the formation of clusters; on the other hand, the commonly used high-boiling point alcohols are used as high-temperature reaction media and reductants in particular for the formation of primary magnetite nanoparticles. However, the role of alcohols remains far from being understood. Herein, systematic studies were carried out to further reveal the molecular role of the high-boiling point alcohols and that of the commonly used stabilizing agent poly(acrylic acid) (PAA). The impact of the structure of alcohols, e.g., monohydric and dihydric alcohols with different chain lengths, on the morphology of the resulting clusters was investigated in detail. The experimental results reveal that the crosslinking effect of the oxidized dihydric alcohols determines the formation of Fe3O4 particle clusters, whereas PAA helps in the formation of spherical clusters by reducing the surface tension. Based on a combination of magnetic measurements and drug loading tests, the impacts of the structures of dihydric alcohols on the magnetic properties, especially on the magnetic response to external fields and drug loading capacities, have been disclosed; in brief, the current study clearly discloses the role of the high-boiling point alcohols in the formation of magnetite particle clusters for the first time, which is beneficial for fine tuning the overall morphology and internal molecular structure of the resulting particle clusters to improve their magnetic response, drug loading efficiency, and MRI contrast enhancing performance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 5
·3505-3510
·
IF 1.354
Guo Jian,Wang Yu,Liu Dan-Dan,Wan Rong,Han Guo-Zhi
We report a simple and green approach to synthesize stable water-dispersible silver nanoparticles decorated by magnetic Fe3O4 and graphene oxide (GO). These results of UV-Vis spectra, along with TEM and SEM indicated that the water-dispersible silver nanoparticles
had cluster flat structure and retained the optical properties of the original silver particle. Combining the advantages of Fe3O4 and GO, the composite nanoparticles showed enhanced catalytic activity with good recycling utilization rate by magnetic separation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 1
·407-413
·
IF 1.354
Zhu Yuanna,Wang Jianrong,Wang Yingzi,Song Xueling,Xu Yanan,Yang Ping
Fe3O4@AlOOH adsorbent with high efficient adsorption capacity was successfully synthesized by controlling the hydrolysis rate for aluminum isopropoxide (AIP) and introducing inductive agent thioglycolic acid (TGA). Al(OH)3-TGA clusters played a key role
in the formation of Fe3O4@AlOOH adsorbent with lamellar structure. Morphology characterization revealed that magnetic Fe3O4 nanoparticles were uniformly deposited on the surface of AlOOH. The lamellar structure of AlOOH and the strong magnetic intensity
of Fe3O4 were helpful for its rapid separation from solution under external magnetic field. Hence, the sample could be regenerated easily and reused in the later adsorption–desorption cycles. The as-prepared sample exhibited ultrafast adsorption rate and high adsorption
capacity in the removal of Congo Red (CR) from aqueous solution. The maximum adsorption capacity of Fe3O4@AlOOH towards CR was 280.90 mg/g and CR was completely removed from the aqueous solution within 60 seconds. The adsorption process was well described by the Langmuir
isotherm model. Electrostatic adsorption was considered as the main adsorption mechanism. Moreover, Fe3O4@AlOOH sample tended to adsorb CR more effectively in the neutral and acidic solution.
✓ 已验证
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2018
·
IF 2.969
Shuai Zhang,Shoulian Wei,Hao Cheng,Wei Li
Nano-scaled Fe 3 O 4 were synthesized using solvothermal synthesis, and amino-modification of nano-scaled Fe 3 O 4 was conducted with APTES. With Fe 3 O 4 -NH 2 and Zn 2+ as the metal centers, 2,6-pyridinedicarboxylic acids as the organic ligand, and using the one-step ultrasonic-assisted method, a new magnetic zinc pyridinedicarboxylic acid nanocomposite (Zn-(PDC) 2 @Fe 3 O 4 ) was synthesized. The structure, composition and morphology of the products were characterized using methods such as X-ray single crystal diffraction, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction, and scanning electron microscope. The results showed that the Zn-(PDC) 2 was almost an octahedron, and the Zn-(PDC) 2 @Fe 3 O 4 looked like a nanoflower. The mimetic peroxidase properties of Zn-(PDC) 2 @Fe 3 O 4 were studied with H 2 O 2 solution and TMB solution as the substrates, and the results showed that: the Michaelis constant of H 2 O 2 by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.411 mM, the maximum reaction rate: v max = 3.440 × 10 −8 M s −1 ; the Michaelis constant of TMB by Zn-(PDC) 2 @Fe 3 O 4 was: K m = 0.189 mM, and the maximum reaction rate: v max = 2.419 × 10 −8 M s −1 , both of which were lower than those of H 2 O 2 and TMB by Fe 3 O 4 and Horseradish Peroxidase (HRP). Based on the reduction of the absorbance of original solution due to the consumption of H 2 O 2 in oxidation-reduction reaction between SO 3 2− and H 2 O 2 under acid conditions, a new method for determining the content of SO 3 2− was established. The linear range of SO 3 2− was 8 × 10 −7 ∼8 × 10 −5 mol/L, the detection limit of SO 3 2− was 8 × 10 −8 mol/L, and the RSD of SO 3 2− was 2.7–9.2%.
✓ 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）