CLINICA CHIMICA ACTA
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2016
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IF 2.799
Dongneng Jiang,Danni Ni,Fei Liu,Liqun Zhang,Linlin Liu,Xiaoyun Pu
Background Renal disease has become a global public health problem. Cast is a useful disease marker of kidney injury and renal failure. Hence, a cast-targeted fluorescent imaging assay is developed for the laboratory diagnosis of renal disease. Methods Firstly, graphene quantum dots (GQDs) were stripped from graphene oxide sheets and amine-modified. Then, anti-human IgG antibody was conjugated with Fe 3 O 4 nanoparticles to identify the cast in urine. Furthermore, the modified GQDs were linked onto the surface of Fe 3 O 4 /anti-IgG nanocomposites. Lastly, this Fe 3 O 4 /GQD fluorescent probe was added into the sample to detect the cast through fluorescent imaging. Results Preliminary application of this probe in clinical detection showed that the common types of casts in urine (including RBC , WBC, fatty and granular casts) could be detected by this fluorescent imaging assay. The method has the advantages of fast speed, high sensitivity (lowest detection limit to 2 casts/ml), good selectivity, and wide linear range (2–2000 casts/ml). Regression analysis also showed that there was a good linear relationship (y = 0.9495 × + 10.974, R 2 = 0.9879) between the fluorescent counts and the casts in urine. Conclusion This cast-targeted fluorescent imaging assay may be a potential method for the laboratory diagnosis of renal disease.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 10
·4014-4021
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IF 3.269
Fuchong Li,Yansheng Liu,Tianqiong Ma,Dianhong Xu,Xu Li,Guangbi Gong
Palladium nanoparticles (NPs) were applied for the hydrodechlorination of chlorophenols in contaminated water using H2 as a clean and sustainable reductant. In this study, a high-efficiency Pd-based catalyst (Pd/Fe3O4@C) was facilely synthesized and applied for the reduction of 4-nitrophenol and hydrodechlorination of 4-chlorophenol in an aqueous solution. Compared with most Pd-based catalysts, the Pd/Fe3O4@C nanocatalyst exhibits a higher catalytic performance. The well-dispersed Pd NPs were modified on the spherical carbon surface through coordination chemical bond. The superparamagnetic character of the Fe3O4 core enabled the Pd/Fe3O4@C nanocatalyst to be very easily separated and recovered from the reaction mixture. Thus, the nanocatalyst can be repeatedly used without significant weight loss. The high catalytic activity of the Pd/Fe3O4@C nanocatalyst indicates that noble metal nanoparticles supported on magnetic carbon sphere materials could act as promising catalysts and have potential applications in numerous Pd-based catalytic reactions.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Yi-Jun Liang,Fengguo Fan,Ming Ma,Jianfei Sun,Jun Chen,Yu Zhang,Ning Gu
A great deal of effort has demonstrated magnetite nanoparticles (Fe 3 O 4 NPs) are important subject applied in tumor hyperthermia due to their excellent magneto-thermal effect. Our previous study had ultrafast prepared 6nm Fe 3 O 4 NPs via microwave approach and found that these small size NPs are responsible for microwave energy conversion to accelerate NPs formation. Hence, we suppose that investigating the size-dependent behavior of Fe 3 O 4 NPs should be beneficial for developing their electromagnetic energy conversion application for hyperthermia. In this study, Fe 3 O 4 NPs with four sizes (i.e. 4nm, 20nm, 50nm and 200nm) were prepared by a rapid microwave synthetic strategy. The specific absorption rate (SAR) value and reflection loss (RL) value of samples were investigated by measuring the time-dependent temperature curves in alternating magnetic field (AMF, 390 and 780kHz, 12A) and via vector network analyzer (VNA) range from 2 to 18GHz, respectively. Results indicated that using magnetic induction hyperthermia frequency Fe 3 O 4 NPs with single domain size of 20nm possess maximum, whereas the RL value increases with the size at microwave frequency. More importantly, the frequency of maximum RL value was matched with the clinical microwave hyperthermia. We subsequently introduce the micromagnetic (OOMMF) simulation to help understanding the issue due to the fundamental importance of size effect for magnetic NPs in energy conversion. Simulation results suggested that coupling interaction and magnetic dipole-dipole interaction between magnetic NPs and electromagnetic field would be seen as synergistic effect to impact absorption behavior, and we believe that this work can provide a valuable reference for size selection of magnetic nanoparticles in clinical application of hyperthermia.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2017
·Vol. 34
·期 7
·1700117
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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.
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Analytical Methods
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2017
·Vol. 9
·期 21
·3099-3104
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IF 1.9
Dong Li,Minghui Hua,Kun Fang,Rong Liang
High-performance magnetic resonance (MR) imaging contrast agents are the key to reliable and accurate diagnosis of diseases using the MR imaging technique. In particular, dual-modal MR imaging nanoprobes that integrated the advantages of a high contrast effect and impressive sensitivity of T1- and T2-weighted MR imaging, respectively, have attracted increasing attention in recent years. However, the current methods for the fabrication of the dual-modal MR imaging nanoprobes suffer from a tedious synthesis procedure, harsh synthesis condition and ambiguous toxicity, strongly hindering their clinic transformation. Herein, we proposed a biomineralization approach for the fabrication of bovine serum albumin (BSA)–Fe3O4 nanoparticles with undoubted biosafety and robust T1 and T2 MR imaging ability in a facile way under mild conditions. BSA not only served as a template to control the growth of nanocrystal, but also enabled the favorable water solubility of the nanoprobe. The outstanding biocompatibility of BSA–Fe3O4 nanoparticles was proven by systematic in vitro and in vivo toxicity assessments, and dual-modal T1 and T2 MR imaging in vivo was achieved successfully. In addition, the nanoprobe was successfully applied for in vivo MR imaging of liver with a broad time window, and the metabolic investigation of BSA–Fe3O4 nanoparticles revealed that they could be eliminated from the body, ensuring a negligible adverse effect. The proposed biomineralization approach opens a new way for the fabrication of dual-modal MR contrast imaging nanoprobe with undoubted biosafety, and other functional proteins also exhibit great potential for the fabrication of dual-modal MR contrast imaging nanoprobe with specific functions with respect to biomineralization.
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JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Shunlong Pan,Jiansheng Li,Gaojie Wan,Chao Liu,Wenhong Fan,Lianjun Wang
In this work, Fe 3 O 4 @Zr(OH) x yolk–shell nanospheres (YSNs) were synthesized via a two-step process and further examined as adsorbents for the removal of Pb(II). To understand the hollow structure on the adsorption properties of Pb(II), another adsorbent without hollow cavities, i.e., Fe 3 O 4 @SiO 2 @Zr(OH) x core–shell nanospheres (CSNs), was also prepared for comparison. The adsorption results showed that Fe 3 O 4 @Zr(OH) x YSNs exhibited 41.6% higher Pb(II) adsorption capacity as compared to that of Fe 3 O 4 @SiO 2 @Zr(OH) x CSNs. The isotherm was well fitted to Langmuir adsorption model with q max value of 310.8 mg/g after normalized by the weight of Zr in Fe 3 O 4 @Zr(OH) x YSNs. Scanning transmission electron microscopy (STEM) mapping results revealed that the existence of cavities between Fe 3 O 4 cores and Zr(OH) x shells is responsible for the improved adsorption performance. XPS analysis indicated the surface hydroxyl groups played a key role in the Pb(II) adsorption. The removal efficiency of Pb(II) was maintained above 90% in five consecutive adsorption–desorption cycles.
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高影响因子
APPLIED CLAY SCIENCE
·
2017
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IF 3.101
Lei Li,Guangxia Qi,Masami Fukushima,Bangda Wang,Hui Xu,Yi Wang
As one of layered double hydroxides (LDH) based heterogeneous catalysts , transition metal oxide pillared LDH composite has attracted considerable research interests as its excellent catalytic efficiency and thermal stability. However, during the preparation especially by reconstruction techniques, abundant interlayer regions of LDH are contaminated by some unexpected anion such as LDH affinitive CO 3 2 − , which will result in inaccessible interlayer active site. In this paper, magnetic nanoparticle Fe 3 O 4 pillared LDH composite was synthesized with exchangeable NO 3 − as the main interlayer anion by decomposition and reconstruction route. The anion exchange, decomposition and reconstruction processes were comprehensively investigated. XRD , TG-DTA-MS, SEM and other methods have been employed to characterize materials. The results show that anion exchange between ferric citrate anion and LDH follows Langmuir isotherm model and pseudo-second-order model. The decomposition and oxidation of anion exchange product (LDH-Fe(C 6 H 4 O 7 ) − ) can be complete at 550 °C for 20 min and crystal Fe 3 O 4 with nanostructure is formed between 500 and 600 °C. When calcined product (LDO-Fe 3 O 4 ) is reconstructed by rehydration in 0.015 M HNO 3 -30 wt% NaNO 3 mixture aqueous solution, CO 3 2 − contamination derived from CO 2 in air can be averted and lamellar structure is successfully recovered with Fe 3 O 4 and NO 3 − remaining in the interlayer gallery of LDH.
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ELECTROCHIMICA ACTA
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2016
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IF 4.803
Yurong Ren,Jiawei Wang,Xiaobing Huang,Jianning Ding
The electrochemical performance of a material varies with its structural phase transition. It is found that the rhombohedral Fe 2 O 3 can transform to the cubic Fe 3 O 4 via a calcination treatment in a nitrogen atmosphere, and lithium-ion storage performances of Fe 3 O 4 get an obvious improvement due to its structural advantages. On the basis of data calculated by X-ray diffraction, the larger unit cell volume as well as the higher void fraction of cubic Fe 3 O 4 provides lithium-ions with more transport channels for Li ions diffusion and storage without serious volume change, and thus the cubic Fe 3 O 4 delivers an excellent reversible capacity of 921.1 mAh g −1 after 15 cycles at the current density of 50 mA g −1 , which is much higher than 328.3 mAh g −1 for the rhombohedral Fe 2 O 3 . To further enhance the structural stability of electrodes, reduced graphene oxide is introduced. The Fe 3 O 4 /reduced graphene oxide show an excellent specific capacity of 825.3 mAh g −1 after 40 cycles and impressive rate performance of 600 mAh g −1 at the current density of 400 mA g −1 , which are much higher than that of Fe 3 O 4 (417 and 300 mAh g −1 ), Fe 2 O 3 (137.4 and 95 mAh g −1 ) and Fe 2 O 3 /reduced graphene oxide (390.1 and 480 mAh g −1 ). These results demonstrate that the structural phase transition and reduced graphene oxide of Fe 3 O 4 /reduced graphene oxide composites offer unique characteristics suitable for high-performance energy storage application.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2016
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IF 5.267
Huanyu Zhang,Jianping Deng,Youping Wu
This contribution reports a novel category of sustainable aldehyde-containing magnetic microspheres (ACMMs) prepared through suspension polymerization. For preparing the ACMMs, lignin-derived vanillin methacrylate (VMA) was used as biobased monomer, while methacrylated-Fe3O4 NPs were used as magnetic supplier. The resulting microspheres were proved to have remarkable magnetic property and adsorption capacity toward paraanisidine, which was employed as a representative of amines. The maximum adsorption was found to be up to 433 mg/g (559 mg/g in theory). Also noticeably, the adsorption was realized by forming a reversible Schiff base under mild conditions. Desorption processes were performed conveniently, proving that the ACMMs can be easily recycled. This work demonstrates the remarkable potentials of ACMMs to be used as scavenger resins in absorbing amines. Also worthy to be highlighted is that the abundant aldehyde groups enable the microspheres to be a promising platform for further preparing functional polymers by employing the Schiff base structure as linking parts, e.g. as biomaterials for immobilizing enzymes.
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APPLIED SURFACE SCIENCE
·
2016
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IF 3.15
Yahui Zhang,Xiaoyan Lin,Quisheng Zhou,Xuegang Luo
The magnetic core-shell Fe 3 O 4 @Alg-La particles were fabricated successfully by a simple method of electro-coextrusion, and employed as an adsorbent for separation of fluoride from aqueous solution. Main factors affecting the removal of fluoride, including pH, adsorbent dosage, initial concentration, temperature and contact time were investigated. The adsorption isotherm and adsorption kinetics were studied to understand the adsorption process in detail. The experimental data were fitted well by the non-linear Freundlich isotherm and linear pseudo-second-order model, the maximum fluoride adsorption capacity was 45.230 mg/g at pH 4, 298.15 K. Thermodynamic parameters indicated that the fluoride adsorption process was feasible and spontaneous. The presence of other anions like Cl − , SO 4 2− , HCO 3 − and PO 4 3− had almost no effect on the fluoride adsorption. The adsorbent can be easily separated from the solution by a magnet. The magnetic core-shell Fe 3 O 4 @Alg-La particles before and after fluoride adsorption were studied by SEM, FTIR, EDX and XPS, which indicated that the adsorption mechanism may be related to electrostatic attraction and Lewis acid-base interaction.
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RSC Advances
·
2016
·Vol. 6
·期 65
·60200-60205
·
IF 3.289
Honglong Li,Lin Jin,Jinglong Dong,Liu Liu,Ming Li,Yu Liu,Linghan Xiao,Yuhui Ao
Poly(phenol-formaldehyde resin)/carbon fiber composites with different ratios of graphene–Fe3O4 were manufactured through a molding press process. Fe3O4 was introduced into the graphene to avoid recombination of the layers. The effects of the amount of added graphene–Fe3O4 on the morphology, thermal conductivity, friction performance and thermal properties of the composites were investigated via scanning electron microscopy, thermal constants analysis, tribology and thermogravimetric tests. Scanning electron microscopy confirmed the enhanced friction surface of the composites and the combination of the resin with the fibers. The thermal conductivity measurements showed that the best results were achieved with 2.0 wt% graphene–Fe3O4. The friction coefficient and wear rate also decreased with the addition of graphene–Fe3O4 based on the tribological results.
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JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
·
2016
·Vol. 34
·期 4
·
IF 1.724
Duan Chen-Long,Deng Zhang,Cao Kun,Yin Hong-Feng,Shan Bin,Chen Rong
Iron(II,III) oxide (Fe 3 O 4 ) nanoparticles have shown great promise in many magnetic-related applications such as magnetic resonance imaging, hyperthermia treatment, and targeted drug delivery. Nevertheless, these nanoparticles are vulnerable to oxidation and magnetization loss under ambient conditions, and passivation is usually required for practical applications. In this work, a home-built rotating fluidized bed (RFB) atomic layer deposition (ALD) reactor was employed to form dense and uniform nanoscale Al 2 O 3 passivation layers on Fe 3 O 4 nanoparticles. The RFB reactor facilitated the precursor diffusion in the particle bed and intensified the dynamic dismantling of soft agglomerates, exposing every surface reactive site to precursor gases. With the aid of in situ mass spectroscopy, it was found that a thicker fluidization bed formed by larger amount of particles increased the residence time of precursors. The prolonged residence time allowed more thorough interactions between the particle surfaces and the precursor gas, resulting in an improvement of the precursor utilization from 78% to nearly 100%, even under a high precursor feeding rate. Uniform passivation layers around the magnetic cores were demonstrated by both transmission electron microscopy and the statistical analysis of Al mass concentrations. Individual particles were coated instead of the soft agglomerates, as was validated by the specific surface area analysis and particle size distribution. The results of thermogravimetric analysis suggested that 5 nm-thick ultrathin Al 2 O 3 coatings could effectively protect the Fe 3 O 4 nanoparticles from oxidation. The x-ray diffraction patterns also showed that the magnetic core crystallinity of such passivated nanoparticles could be well preserved under accelerated oxidation conditions. The precise thickness control via ALD maintained the saturation magnetization at 66.7 emu/g with a 5 nm-thick Al 2 O 3 passivation layer. This good preservation of the magnetic properties with superior oxidation resistance will be beneficial for practical magnetic-based applications.
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