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Background: Metal oxide itself and metal oxide nanoparticles are gaining significant importance due to their reusability and wide range of catalytic applications in many organic transformations. Objective: This study aimed to report a simple and efficient Fe3O4catalyzed one-pot fivecomponent reaction protocol for the synthesis of novel thiophene containing aminonaphthols under solvent-free conditions. Methods: To prepare the Fe3O4 nanoparticles by facile and simple co-precipitation method, surface characterization was done using FT-IR, XRD, BET, SEM, and TEM analysis techniques. Aminonaphthol derivatives bearing thiophene moiety were synthesized using Fe3O4 nanoparticles under solvent-free condition. Results: The prepared nanoparticles are smaller in size (15nm) and can be easily separated. They can be recycled and reused five times without any significant loss of catalytic activity with excellent yields in short time. The existing protocol for the synthesis of aminonaphthols becomes feasible and attractive due to reusability of catalyst, excellent catalytic performance, and eco-friendly procedure. Conclusion: In conclusion, Fe3O4 nanoparticles provide a simple, efficient and greener one-pot five component synthetic approach for the synthesis of thiophene containing aminonaphthols. Excellent catalytic activity was perceived in short reaction time without any co-catalyst or any other activator. Moreover, reusability of catalyst, high yields and environmentally benign solvent-free condition are key factors of this protocol.

Background Nanobiomedicines have gained increasing attention for their potential to improve efficacy and are emerging as a promising therapeutic paradigm. Magnetic nanoconjugates loaded with bioactive drugs have the advantage of sustained circulation in the bloodstream and significantly reduced toxicity of therapeutic agents in a precise manner. The well-developed surface chemistry of Fe3O4 has led to the development better tools, promoting them as nanoplatforms with potential technological applications in biomedical sciences. Results Fe3O4 phytohybrids with Laxmitaru extract as the primary coating and loaded with Eugenol and Ylang-Ylang essential oils were successfully synthesized. The X-ray diffraction technique has revealed the high purity nanoparticle materials, as no additional impurity peaks were observed. Fourier transform infra-red spectra have confirmed the presence of a primary coating of Laxmitaru extract and a secondary layer of essential oil, as additional peaks and broadening are observed in drug-loaded Fe3O4 nanoparticles. Magnetic susceptibility values indicate the material's superparamagnetic nature. Transmission electron microscopy images have ensured that the particles were spherical, monodispersed, and in the range of 4.30 nm to 13.98 nm. Antimicrobial studies show inhibition zones on the microorganisms S. Aureus and E. Coli with enhanced activity. Drug entrapment efficiency studies revealed the encapsulation of drug molecules onto Fe3O4-Laxmitaru composite. Dynamic light scattering studies confirm the increase in hydrodynamic size, indicating the loading of essential oils and the decrease in polydispersity index ensures monodispersed nanoparticles. The antioxidant study showed the essential oils retained their antioxidant activity even after they were conjugated on Fe3O4-Lax composites. Conclusions Laxmitaru phytochemical-coated Fe3O4 nanoparticles were successfully conjugated with Eugenol and Ylang-Ylang essential oils. Our results provide a model therapeutic approach for the development of new alternative strategies for enhancing antimicrobial and antioxidant therapy, with potential advantages in the field of nanobiomedicine.

In the present study, the thermal conductivity (knf) of hybrid nanofluids containing SWCNT and Fe3O4 nanoparticles with a ratio of 40%–60% in ethylene glycol base fluid was investigated in the laboratory and performance analysis. The knf of hybrid prepared nanofluids was measured using KD2 device with the error of 5%. Then, the price-performance analysis of the nanofluid was performed to evaluate the performance and efficiency of the present nanofluids and mono nanofluids (SWCNT/ethylene glycol). Then, using artificial neural network (ANN), experimental data are modeled and estimated in terms of temperature and volume fraction of nanoparticles ( ϕ ). Sensitivity analysis of experimental data was also performed to slope the knf changes to determine the best temperature and ϕ for nanofluid operation. Experimental data show that nanofluids with ϕ = 1 % show more than 40% increase in knf. Price-performance analysis that presented to provide capability in energy management shows that the use of hybrid nanofluids can be more economical than the cost of mono nanofluids.

Developing high-performance non-precious metal-based electrocatalysts for oxygen reduction reaction (ORR) is an urgent demand. In this study, we prepared highly efficient Fe3O4-nanoparticles-decorated Fe–N–C nanosheets (Fe3O4/CCOPHM-F127) from 2D covalent organic polymer (COP) for ORR via a facile impregnation method. The introduced anionic surfactant, i.e. F127, can effectively improve the distribution and size uniformity of Fe3O4 nanoparticles. The onset potential of Fe3O4/COPHM-F127 is 1.0 V, which is equivalent to that of commercial Pt/C. Moreover, the half-wave potential of Fe3O4/COPHM-F127 can reach up to 0.87 V, which is better than that of commercial Pt/C. Fe3O4/COPHM-F127 also exhibits excellent durability and methanol tolerance during the electrocatalytic process.

Cu(II) supported on 5-oxo-4,5-dihydro-pyrrole-3-carboxylic acid functionalized Fe3O4 nanoparticles (Cu(II)-OHPC-Fe3O4) as a new magnetic nanocatalyst was prepared and characterized by ICP-AES, FT-I...

This study focused on the synthesis of silica-coated magnetic Fe3O4 (Fe3O4@SiO2) nanoparticles and their application for the improvement of the vapor-phase adsorption of benzene. The magnetic Fe3O4@SiO2 nanoparticles were synthesized according to the co-precipitation method, while their characterization was performed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) surface area analyses. The experimental parameters were optimized to achieve the maximum adsorption capacity for the vapor-phase benzene by Box-Behnken design (BBD) under response surface methodology (RSM). The magnetic Fe3O4@SiO2 nanoparticles adsorbed 197.50 mg/g of the vapor-phase benzene under the following optimum conditions: 39.48 min residence time, 14.21 ppm initial benzene concentration and 26.51°C temperature. The Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were used to evaluate the adsorption equilibrium data, and the results were found to be well fitted to the D-R model. The kinetic data obeyed the pseudo-second-order kinetic model for the vapor-phase adsorption of benzene by magnetic Fe3O4@SiO2 nanoparticles. This study demonstrated the application potential of magnetic Fe3O4@SiO2 nanoparticles as promising low-cost nano-adsorbents for the vapor-phase adsorption of benzene.

Haw-Ming Huang,1,2 Ping-Han Wu,3 Po-Chien Chou,4 Wen-Tien Hsiao,5 Hsin-Ta Wang,4 Hsin-Pei Chiang,3 Chi-Ming Lee,6 Shwu-Huey Wang,6 Yu-Cheng Hsiao2,7 1School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei, Taiwan; 2Graduate Institute of Biomedical Optomechatronics, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan; 3Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan; 4School of Organic and Polymeric, National Taipei University of Technology, Taipei, Taiwan; 5Department of Medical Imaging and Radiological Technology, Yuanpei University of Medical Technology, Hsinchu, Taiwan; 6Core Facility Center, Office of Research and Development, Taipei Medical University, Taipei, Taiwan; 7Cell Physiology and Molecular Image Research Center, Taipei Municipal Wan Fang Hospital, Taipei Medical University, Taipei, TaiwanCorrespondence: Yu-Cheng Hsiao; Ping-Han WuTaipei Medical University, No. 250, Wu-Hsing Street, Taipei, 11031, TaiwanTel +886-291-937-9783Fax +886 2 27362295Email ychsiao@tmu.edu.tw; gahwclbjwph@gmail.comIntroduction: It has been reported that low-molecular-weight hyaluronic acid (LMWHA) exhibits a potentially beneficial effect on cancer therapy through targeting of CD44 receptors on tumor cell surfaces. However, its applicability towards tumor detection is still unclear. In this regard, LMWHA-conjugated iron (Fe3O4) nanoparticles (LMWHA-IONPs) were prepared in order to evaluate its application for enhancing the T2* weighted MRI imaging sensitivity for tumor detection.Methods: LMWHA and Fe3O4 NPs were produced using γ-ray irradiation and chemical co-precipitation methods, respectively. First, LMWHA-conjugated FITC was prepared to confirm the ability of LMWHA to target U87MG cells using fluorescence microscopy. The hydrodynamic size distribution and dispersion of the IONPs and prepared LMWHA-IONPs were analyzed using dynamic light scattering (DLS). In addition, cell viability assays were performed to examine the biocompatibility of LMWHA and LMWHA-IONPs toward U87MG human glioblastoma and NIH3T3 fibroblast cell lines. The ability of LMWHA-IONPs to target tumor cells was confirmed by detecting iron (Fe) ion content using the thiocyanate method. Finally, time-of-flight secondary ion mass spectrometry (TOF-SIMS) imaging and in vitro magnetic resonance imaging (MRI) were performed to confirm the contrast enhancement effect of LMWHA-IONPs.Results: Florescence analysis results showed that LMWHA-FITC successfully targeted the surfaces of both tested cell types. The ability of LMWHA to target U87MG cells was higher than for NIH3T3 cells. Cell viability experiments showed that the fabricated LMWHA-IONPs possessed good biocompatibility for both cell lines. After co-culturing test cells with the LMWHA-IONPs, detected Fe ion content in the U87MG cells was much higher than that of the NIH3T3 cells in both thiocyanate assays and TOF-SIMs images. Finally, the addition of LMWHA-IONPs to the U87MG cells resulted in an obvious improvement in T2* weighted MR image contrast compared to control NIH3T3 cells.Discussion: Overall, the present results suggest that LMWHA-IONPs fabricated in this study provide an effective MRI contrast agent for improving the diagnosis of early stage glioblastoma in MRI examinations.Keywords: hyaluronic acid, Fe3O4 nanoparticles, TOF-SIMS, MRI

The Fe3O4/ZnO/Ag nanocomposite has been successfully synthesized, and the material was applied as a photocatalyst to degrade titan yellow. The Fe3O4 was synthesized through sono-coprecipitation method using NH4OH as a precipitating agent. The synthesized ZnO/Ag was performed via coprecipitation method using ethylene glycol, zinc acetate, and silver nitrate as a reagent. This study investigated several parameters, such as the effect of time reaction, equilibrium state, and material responsiveness under visible light irradiation. The XRD measurement indicated the presence of ZnO, Ag, and Fe3O4, whereas the TEM image displayed the photocatalyst had a nanosized particle with approximately 17 nm. The photocatalyst activity has shown the equilibrium process at 60 minutes. The highest degradation (up to 90%) of titan yellow was achieved by Fe3O4/ZnO/Ag nanocomposite. The reusability test showed that Fe3O4/ZnO/Ag nanocomposite had high stability and could be used up to three times.

Green biosynthesis of Fe3O4nanoparticles (NPs) using plant extract is desired, as the plant extract is safe for humans and the environment. In this study, magnetite Fe3O4NPs were greenly prepared using Punica granatum L. fruit peel extract as a reducing and capping agent. The effect of iron precursor contraction (0.01–0.1 M, FeCl3) was studied. The Fe3O4crystalline with an average crystallite size range from 21 to 23 nm was proven by X-ray powder diffraction. Scanning electron microscopy images showed that the synthesized Fe3O4NPs were mostly cubical. Ultraviolet-visible spectra showed that the prepared Fe3O4NPs exhibit absorption at 270 nm related to the Fe3O4NPs with a direct bandgap ranging from 1.87 to 2.26 eV and indirect bandgap of 2.16–2.48 eV. Fourier transform infrared spectroscopy analysis showed two characteristic absorption bands at 515 and 567 cm−1, which proved the successful formation of Fe3O4. The proposed method using Punica granatum L. fruit peel extract offers an economical and environmentally friendly route for synthesizing many other types of metal oxides.

Currently, one of the critical issues in the world is finding an appropriate green alternative to fossil fuels due to the concerns about global warming. As a hydrogen source, formic acid has been given particular attention owing to the attractive features such as high-energy density, no toxicity, high stability at ambient temperature and high hydrogen content. Introducing an affordable and highly efficient catalyst with easy recovery from the reaction mixture for selective dehydrogenation of formic acid is still demanding. In this report, we used a simple one-step process to synthesize Ni@Pd core shell nanoparticles on 3-aminopropyltriethoxysilane modified Fe3O4 nanoparticles. The existence of Ni and Pd results in a synergic effect on the catalytic activity. The NH2 groups play an important role for obtaining well-dispersed ultrafine particles with high surface area and active sites. In addition, Fe3O4 lead to convenient magnetic recovery of the catalyst from reaction mixture. Our results indicate that the as-prepared catalyst give the superb turnover frequency of 5367.8 h−1 with no additive, which is higher than most of the previously reported catalysts.

Corrosion-resistant electromagnetic shielding materials with high conductivity and excellent magnetic properties are urgently needed to resolve the issue of electromagnetic radiation pollution. Her...

Sulfamic acid 2-Aminobenzothiazole-6-carboxylic acid functionalized Fe3O4 nanoparticles as a novel organic-inorganic hybrid heterogeneous catalyst were manufactured and characterized by FT-IR, XRD,...

Here, we developed a one-step method to prepare a highly tough and magnetic (1.2 emu g–1) polyacrylamide-Fe3O4-alginate (PAAM-Fe3O4-ALG) double-network hydrogel. Magnetic Fe3O4 nanoparticles (MNPs)...

Recently, magnetic nanomaterials have emerged as multifunctional materials for a wide range of biomedical applications. Functional magnetic iron oxide nanoparticles (FMIONs) are typical magnetic nanomaterials with inherent advantages for disease diagnosis, prevention, and treatment: high specific surface area, excellent superparamagnetism, good colloidal stability, and remarkable biosafety. Therefore, FMION‐based biomedicine has advanced at an unprecedented rate in recent years. However, the performance of FMIONs cannot yet meet complicated physiological circumstances. To overcome these limitations, researchers have designed and manipulated the geometric shapes, sizes, compositions, and surfaces to endow these FMIONs with high performance. This review summarizes recent advances in the controlled synthesis of FMIONs, cover corresponding theories of nucleation and growth in solution, and the tuning of FMION properties for disease diagnosis and therapy. After discussing the biomedical applications in cancer theranostics—tumor hyperthermia, magnetic resonance imaging and drug delivery system—in detail, the review concludes with current challenges and outlooks for the development of FMIONs.

GO-Fc@Fe3O4 nanohybrid as a powerful and reusable nanocatalyst was synthesized. The graphene oxide (GO) sheets with meta-chloroperoxybenzoic acid (mCPBA) were treatment, afterward were chemically modified with 4-Fc derivative through the ring-opening reaction between GO nanosheets and 4-ferrocenylbutylamine. Then, the final nanocatalyst was obtained by synthesizing of Fe3O4 nanoparticles onto the modified GO surface. The structure and morphology of GO-Fc@Fe3O4 nanohybrid were characterized using different analysis, such as FT-IR, XRD, FE-SEM, EDX, and VSM techniques. Then, 2-amino-3-cyano-4H-pyran derivatives (4a–l) as a synthetic precursor were synthesized via multi-component reaction in the presence of GO-Fc@Fe3O4 nanohybrid as a novel heterogeneous nanocatalyst. Finally, according to the importance of finding a solution to treat Alzheimer’s disease, 14-aryl-10,11,12,14-tetrahydro-9H-benzo[5,6]chromeno[2,3-b]-quinolin-13-amines (5a–l) as new tacrine-naphthopyran hybrid analogs were designed and prepared as acetylcholinesterase inhibitors. These compounds were synthesized via Friedlander reaction of 2-amino-3-cyano-4H-pyran derivatives (4a–l) with cyclohexanone. HAChE inhibition assay was carried out in vitro on the synthesized compounds 5a–l. Among them, compound 5f exhibited potent hAChE inhibitors with IC50 values of 0.16 µM. Also, the molecular docking and kinetic studies performed for a better understanding of compound 5f as a representative compound.

Nanocrystalline powder of neodymium substituted iron oxides samples were synthesized through the microwave approach. The synthesized pristine Fe3O4 and Nd-doped Fe3O4 structural properties were analyzed by the X-ray diffraction technique. The microstructural details, morphology and elemental composition were assessed by transmission and scanning electron microscopy attached with EDX. The Fe3O4 nanostructures possess spherical morphology as well as consistent particle size distribution, which is confirmed by HR-SEM. The formation of Fe3O4 with high purity was confirmed by EDX and XRD analysis. The particle size calculated by HR-TEM images and crystallite size through the XRD study showed that the value obtained by both the methods is nearly the same. The catalytic properties of Fe3O4 nanoparticles are examined in the selective oxidation of styrene.

Bu çalışmada öncelikle halka açılma polimerizasyon yöntemiyle poli (ԑ-kaprolakton) (PCL) sentezlendi. Ardından PCL’ ye siyanürik klorür (CC) bileşiği bağlandı ve 3-aminopropil trimetoksisilan ile kaplanmış manyetik Fe3O4 nanopartikülleri (MNP) ile modifiye edildi. Sentezlenen polimerlerin karekterizasyonu FT-IR, 1H-NMR ve 13C-NMR ile yapıldı. Termal veriler a-MNP’ nin termal kararlılığının (PCL-g-CC) bağlandıktan sonra düştüğünü gösterdi. Titreşimli numune manyetometre (VSM) ölçümlerinden (a-MNP)’ nin doygunluk manyetizasyon değeri (Ms) 52.07 emug-1 ve [PCL-g-CC-g-(a-MNP)]’ nin Ms değerinin ise 32.08 emug-1 olduğu belirlendi. Ayrıca VSM ölçümlerinden partikül boyutları a-MNP ve [PCL-g-CC-g-(a-MNP)] için sırasıyla 15.98 nm ve 21.41 nm olarak hesaplandı. [PCL-g-CC-g-(a-MNP)] SEM görüntüsünde a-MNP’ nin polimer içerisinde hapsolduğu belirlenirken, EDX verilerinde görülen Fe atomu, yapıda MNP’ nin olduğunu kanıtlar niteliktedir.

A 2D/0D heteronanostructure (HNS) employing WSe2 as 2D nanosheets and Fe3O4 as 0D nanoparticles has been facilely synthesized at room temperature using a simple wet chemical route. The process invo...

A type of magnetic composite Fe3O4@MOFUIO-66@TzDa-COF with a matryoshka structure was successfully synthesized by following a specific synthesis order. The Fe3O4@MOFUIO-66@TzDa-COF still has an eff...

The fabrication of the inorganic metal oxide nanoparticles by using extract of the different part of the plant was gaining an overwhelming response from the last few years. Magnetic iron oxide nano...

Methionine-coated Fe3O4 nanoparticles, a magnetically reusable and environmentally friendly heterogeneous catalyst, was synthesized. The new catalyst was characterized by FT-IR spectra, XRD, SEM, and EDX analysis and was used to catalyze the cycloaddition of nitriles and sodium azide in DMSO at 120°C to give the corresponding 5-substituted 1H-tetrazoles. Methionine-coated Fe3O4 nanoparticles proved to be highly efficient for this organic reaction. The catalyst can be easily separated and reused several times without loss of activity. The proposed procedure also offers several benefits such as quick reaction, high yields, clean process, low-cost heterogeneous catalyst, low loading of catalyst, and simple operation.

A facile, cost-effective, and eco-friendly method was proposed to synthesize Fe3O4@tannic acid@Au nanocomposites (Fe3O4@TA@Au). First, Fe3O4 nanoparticles with diameters of 20 and 200 nm were synthesized by co-precipitation and solvothermal methods, respectively. Gold nanoparticles were deposited on magnetic Fe3O4 through tannic acid-metal-polymer intermediate-layer-mediated reductions. The catalytic activities of the as-prepared Fe3O4@TA@Au were investigated by spectroscopically monitoring the reduction of 4-nitrophenol (4-NP) and methylene blue (MB), which could be achieved within several minutes with an excess of NaBH4. The impact of the Fe3O4 size on the overall catalytic ability of the Fe3O4@TA@Au was systematically studied. The reaction rate constants of the Fe3O4-20 nm@TA@Au for 4-NP and MB reduction were 0.432 and 0.543 min–1, respectively. For the Fe3O4-200 nm@TA@Au nanocomposite, the optimized reaction rate constants for 4-NP and MB reduction were 3.09 and 0.441 min–1, respectively. Due to magnetic separation, the Fe3O4@TA@Au could be easily harvested and recycled. After five recycling cycles, the catalytic ability remained over 90%, and the recycling process could be completed in several minutes, highlighting its potential as a catalyst for 4-NP and MB removal.

Water pollution and its hazardous effects due to inadequate disposal of toxic arsenic (As) species is a severe environmental concern globally. In the present study, magnetic Fe3O4 nanoparticles (NP...

Poly(acryloyl chloride) (PAC) was first reacted with oxidized MWCNT to form oxidized MWCNT-g-PAC. Then, aminated MNP were bonded to the oxidized MWCNT-g-PAC to form oxidized MWCNT-g-PAC-g-aminated MNP. The chemical characterization for primary and the product materials was performed using FT-IR spectroscopy. SEM images and SEM–EDX were used for the surface morphology and elemental characterization, respectively. Vibrating sample magnetometer measurements showed that aminated MNP and oxidized MWCNT-g-PAC-g-aminated MNP have magnetic saturation values of 52.07 emu/g and 20.38 emu/g, respectively. Both of the two samples indicated the superparamagnetic nature. TGA measurements were accomplished to compare the thermal stability of materials. Also, the DSC measurements were performed to compare Tg temperatures. While AC conductivity values of the oxidized MWCNT-g-PAC and oxidized MWCNT-g-PAC-g-aminated MNP increased by increasing frequency, it has not changed with increasing temperature. This result indicates that these materials act as electrical insulators.

In the last decades, biotechnological applications have led to the optimization of the cultural conditions for the production of exopolysaccharides (EPSs) by cyanobacteria. Nostoc is a genus of cyanobacteria found in various environments that forms colonies composed of filaments of moniliform cells in a gelatinous sheath. The effect of some important nutritional and growth beside iron nanoparticles on production by Nostoc sp. was studied. Optimization of the cultural conditions was carried out using Central Composite Design (CCD), and it was achieved at pH 8.39, 1% of NaCl and 0.8 g.l-1 nitrate based in modified BG0 medium and more than 12 g.l-1 of EPS was obtained by phenol-sulphuric acid method. The present research investigated the possibility of inducing EPS production in the presence of Fe3O4 nanoparticles from optimized microalga cultures. This study revealed that Nostoc sp. treatment with 10 mg.l-1 Fe3O4 NPs induced maximal EPS production (4 µg.ml-1).

Iron-supported catalysts exhibit good catalytic performance in direct coal liquefaction (DCL), but the effect of the carrier on the performance of the composite catalyst is unclear. In this paper, a simple solid-state synthesis strategy for the preparation of coal-loaded Fe3O4 nanoparticles (Fe3O4/Coal) and the hydrochloric acid treatment of coal-loaded Fe3O4 nanoparticles (Fe3O4/Coal-HCl) is presented. The resulting composite was used as a catalyst for DCL. The effects of supports on the structure and performance of iron-supported catalysts have been illustrated. After the acid pretreatment of the catalyst carrier coal, the surface structure and functional groups changed, which affected the aggregation morphology of the Fe3O4 active component. The Fe3O4/Coal-HCl catalyst improved the catalytic performance of DCL with conversion and oil yield of 98.02 and 49.96 wt %, respectively. The result shows that pretreatment can be an effective way to modify the surface of the catalyst carrier coals, thereby further improving the catalytic performance of composites. The iron-based composites prepared by the solid-state route show great potential as supported catalysts in DCL.

Background:In the past few years, Magnetite (Fe3O4) nanoparticles have gained a significant research interest in the field of biology, chemistry, metallurgy due to their wide range of applications. Some of their important applications include drug delivery, chemotherapy, low-friction seals, magnetic fluid, adsorbent, recovery of hazardous wastes, etc.Methods:In the present paper, we reported an eco-friendly route of preparing magnetite nanoparticles by using leaves of Tilia Tomentosa (Ihlamur) followed by calcination at 400 ˚C for 15 minutes.Results:The bandgap energy of the prepared Fe3O4nanoparticles was studied by UV–Visible spectroscopy and the value was found to be 3.31 eV. The scanning electron microscopy (SEM) image showed the spherical magnetite nanoparticles with an average size of 25 nm. The phases and thermal properties of Fe3O4nanoparticles were studied by using X-ray diffraction, thermogravimetric (TG) and differential thermal analysis (DTA). The enthalpy change of Fe3O4nanoparticles was calculated by using the DTA curve and the value was found to be 4.97 kJ/mol at 8˚C/min heating rate. The antimicrobial activity of Fe3O4nanoparticles was carried out by the minimum inhibition concentration (MIC) assay method. Except for B. subtilis, Fe3O4nanoparticles demonstrated significant antibacterial property.Conclusion:The prepared magnetite nanoparticles showed excellent thermal stability and less weight loss over a 30–1000 ˚C temperature range. The size of the prepared magnetite nanoparticles is very less therefore they interacted effectively with the organelle, enzymes, and cells of bacteria and inhibited bacterial growth by killing them.

Three different composites (5, 10, and 20 wt. %) were prepared using purified PVC and POH-g-N3PTMS-g-Fe3O4. Firstly, 3-azidopropyltrimethoxysilane was synthesized under reflux from 3-chlorotrimethoxysilane and sodium azide. Then, magnetic nanoparticle was bonded with the silane group of 3-azidopropyltrimethoxysilane. After that the 3-azidopropyltrimethoxysilane bearing magnetic nanoparticle undergo click reaction with propargyl alcohol, and then the composites were prepared. Some characterization, including FT-IR spectroscopy, SEM, Differential scanning calorimetry (DSC), vibrating sample magnetometer (VSM), and EDX images was performed to the composites. The DSC measurements showed that the click reaction of the 3-azidopropyltrimethoxysilane graft magnetic nanoparticles (N3PTMS-g-Fe3O4) reduced the glass transition temperature (Tg). Click reaction reduced the thermal stability of N3PTMS-g-Fe3O4. The thermal stabilities of the composites increased by increasing the compositional rate. It was found that the 10% PVC /POH-g-N3PTMS-g-Fe3O4 reached saturation magnetization (Ms) at 5.12 emu/g. The dielectric constant (ε´) and dielectric loss (″) of POH-g-N3PTMS-g-Fe3O4 rapidly decreased with increasing applied frequency and then remain more or less constant. Also, the AC conductivity (ac) increased sharply with increasing the applied frequency. While the ε´ decreased slightly for the composites by increasing the applied frequency and the ac increase dramatically with an increase in applied frequency at room temperature.

Polythiophene@Fe3O4 (PTh@Fe3O4) nanocomposites with different morphologies were prepared via in-situ oxidative polymerization by using Fe3O4 nanoparticles with spherical and flower-like morphologie...

In this article, water-based epoxy–acrylate (EP/AC) emulsion coatings and its nanocomposites with Fe3O4 nanoparticles, graphene oxide nanosheets and graphene oxide which was decorated with Fe3O4 na...

The tetrafluoroterephthalonitrile cross-linked β-cyclodextrin was first subjected to the carboxylation reaction, followed by the deposition of the Fe3O4 nanoparticles on its surface to obtain the n...

In this work, an appropriate method for the synthesis of benzo[d]imidazo[2,1-b]thiazole-1-ium hydroxide derivatives has been developed using a benzoylthiourea Cu(ΙΙ) complex immobilized on silica-coated Fe3O4 nanoparticles (Fe3O4@SiO2-BTU-Cu(II)) as a highly stable, heterogeneous and magnetically recoverable nanocatalyst. The constructed superparamagnetic nanocatalyst was characterized by VSM, ICP, FT-IR, TGA, SEM–EDX, TEM and XRD analyses. The nanocatalyst was easily recoverable through an external magnet and reused at least 6 times regardless of any considerable loss of its catalytic activity.

The TiO2/Fe3O4 nanoparticle has been successfully synthesized and the material is then applied as a photocatalyst to reduce Pb(II). The Fe3O4 was synthesized through sono-coprecipitation method using NH4OH as a precipitating agent. The coating TiO2 onto Fe3O4 was performed respectively via hydrolysis reaction and sol-gel process using ammonium sulfate and TTIP as a reagent of TiO2. This study investigated several parameters such as the effect of time, equilibrium state and material responsiveness toward ultraviolet light. The XRD measurement indicated the presence of Fe3O4 and TiO2 while TEM image displayed the photocatalyst had a nanosized particle with approximately 60 nm in size. An activity test at pH 4, the equilibrium of photoreduction process showed at 60 minutes. The kinetic parameter of Pb(II) reduction at various catalyst presented that TiO2/Fe3O4 nanoparticle had better reduction rate constant than that of TiO2. Reusing of TiO2/Fe3O4 photocatalysts showed the results of Pb (II) photoreduction were not significantly decrease and the results of photocatalysis were still better than TiO2.

Magnetic nanomaterials are studied extensively because of their wide range of possible applications. Synthesis of Fe3O4 with citrate and polyethylene glycol (PEG) as stabilizing agents was carried out. In this study, the effect of media of water, sodium citrate and polyethylene glycol as stabilizing agents on the shape and size of Fe3O4 magnetite nanoparticles was investigated. The synthesis of Fe3O4, Fe3O4/citrate, and Fe3O4/PEG was carried out by the coprecipitation method at controlled pH. The products were characterized by infrared spectrophotometry, X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX). Qualitative test of magnetism was also carried out on the three materials. The results showed that Fe3O4 nanoparticles prepared with sodium citrate and PEG have a diameter of 12 and 10 nm, respectively. In the sodium citrate medium, it gives Fe3O4 colloidal nanoparticle with electrostatic stabilization mode, while in the PEG medium it shows steric stabilization mode. Magnetite produced in PEG medium has the homogeneous size and is much more stable than that obtained in citrate medium

To elevate the accurate diagnosis of tumors, nanomaterial-based magnetic resonance imaging (MRI) contrast agents are being rapidly developed. In this paper, we report the large-scale synthetic meth...

The bio-inspired synthesis of Fe3O4 nanoparticles using a common kitchen waste, Bengal gram bean (Cicer arietinum L.) extract (BGBE) for enhanced adsorption of toxic indigo carmine dye is reported....

This paper aims to improve medical strategies regarding cancer treatment, by developing new targeted cancer therapy nanostructured systems, based on magnetite and natural catabolism products as coating agents (glutamic acid, tartaric acid), with induced cellular internalization. In order to create hydrophilic, biocompatible systems, suitable for targeted cancer therapy, and minimize the negative side effects of current approaches, a one-pot synthesis by co-precipitation technique, starting from Fe2+ and Fe3+ inorganic precursors and multifunctional organic compounds, carefully controlling the reaction parameters (concentration of precursors, pH, temperature etc.) was performed. The obtained Fe3O4 stabilised nanoparticles were subjected to morphological and structural characterization. The formation of inorganic-organic hybrid systems was evaluated using FTIR spectroscopy and complex thermal analysis (TG / DSC) for determining the content of the organic component, while X-ray Diffractometry and Scanning and Transmission Electron Microscopy were used to characterize the crystallinity and particle dimensions and distribution. The magnetic properties at room temperature were also evaluated, recording the magnetic susceptibility relative to the applied magnetic field.