Formation and Magnetic Characterization of Magnesium Oxide / Iron Nano Composite Particles

2011 ◽  
Vol 236-238 ◽  
pp. 1927-1930
Author(s):  
Yuan Yuan Kong ◽  
Hao Zhou
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Drug Carriers ◽  
Spherical Particles ◽  
Reactant Ratio ◽  
Nano Composite ◽  
Future Drug ◽  
Micro Morphology

Nano-sized composite magnetic particles MgO /Fe were in-situ combustion synthesized at 620°Cfor the Mg-70.9wt%Fe3O4 system. In this paper, we discussed the reactant ratio on the influence of micro-morphology and the magnetic properties of nanoparticles. It was indentified that: Mg(29.1wt%) was the suitable reactant ratio, the sintered composite spherical particles with mean diameter 40nm distributed evenly, particles had good soft magnetic properties, and it was the future drug carriers materials.

Adsorption of Iron (II) Ion by Using Magnetite-Bentonite-Based Monolith from Water

2021 ◽  
Vol 892 ◽  
pp. 10-16
Author(s):  
Ismi Nurul ◽  
Syamsuddin Yanna ◽  
Adisalamun ◽  
Aulia Sugianto Veneza ◽  
Darmadi
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Solution Concentration ◽  
Iron Solution ◽  
Monolayer Adsorption ◽  
Coprecipitation Process ◽  
Non Linear ◽  
Magnetic Loading ◽  
Langmuir Constants

In this study, iron removal was carried out by the adsorption process as a well-known method of removing heavy metal. Natural bentonite with magnetic properties in a monolithic form or Magnetite-Bentonite-based Monolith (MBM) adsorbent was used as an adsorbent to remove Iron (II) ion from the aqueous solution. The magnetic properties of adsorbents are obtained by adding magnetite (Fe3O4), which is synthesized by the coprecipitation process. The characterization of magnetic properties was performed using the Vibrating Sample Magnetometer (VSM). VSM results showed that the magnetic particles were ferromagnetic. Adsorption efficiency, isotherm model, and adsorption kinetics were investigated in a batch system with iron solution concentration varied from 2 to 10 mg/L and magnetite loading at 2% and 5% w/w. The highest removal efficiency obtained reached 89% with a 5% magnetite loading. The best fit to the data was obtained with the Langmuir isotherm (non-linear) with maximum monolayer adsorption capacity (Qo) at 5% magnetic loading MBM adsorbent is 0.203 mg/g with Langmuir constants KL and aL are 2.055 L/g and 10.122 L/mg respectively. The pseudo-first-order (non-linear) kinetic model provides the best correlation of the experimental data with the rate of adsorption (k1) with magnetite loading 2% and 5%, respectively are 0.024 min-1 and 0.022 min-1.

Ultrafine magnetic particles dispersed in silica: Characterization of cobalt iron citrate precursor and magnetic properties

2008 ◽  
Vol 43 (5) ◽  
pp. 1112-1118 ◽  
Author(s):  
Sagrario M. Montemayor ◽  
L.A. García-Cerda ◽  
J.R. Torres-Lubián ◽  
O.S. Rodríguez-Fernández
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Iron Citrate ◽  
Cobalt Iron ◽  
Citrate Precursor

An Innovative Use of TDR Probes: First Numerical Validations with a Coaxial Cable

2018 ◽  
Vol 23 (4) ◽  
pp. 437-442
Author(s):  
Raffaele Persico ◽  
Iman Farhat ◽  
Lourdes Farrugia ◽  
Sebastiano D'Amico ◽  
Charles Sammut
Keyword(s):  
Magnetic Properties ◽  
Transmission Line ◽  
Time Domain ◽  
Numerical Data ◽  
Time Domain Reflectometry ◽  
Coaxial Cable ◽  
Transmission Line Model ◽  
Properties Of Materials

In this paper we propose a study regarding some possibilities that can be offered by a time domain reflectometry (TDR) probe in retrieving both dielectric and magnetic properties of materials. This technique can be of interest for several applications, among which the characterization of soil in some situations. In particular, here we propose an extension of the paper “Retrieving electric and magnetic propetries of the soil in situ: New possibilities”, presented at the IWAGPR, held in Edinburgh in 2017, and as a new contribution we will validate a transmission line model with numerical data simulated by the CST code.

Novel methods for in situ characterization of individual micro- and nanoscale magnetic particles

MRS Bulletin ◽  
2013 ◽  
Vol 38 (11) ◽  
pp. 933-937
Author(s):  
John Moreland ◽  
Yoshihiro Nakashima ◽  
Jacob W. Alldredge ◽  
Gary Zabow
Keyword(s):  
Magnetic Particles ◽  
In Situ Characterization ◽  
Novel Methods ◽  
Image Position

Abstract

Green Magnetic Composite Sheet from Durian Shell and Nano-Magnetite Particles

2015 ◽  
Vol 761 ◽  
pp. 515-519 ◽  
Author(s):  
Mohd Khairul Shahril ◽  
Rose Farahiyan Munawar ◽  
Muhd Hafez Mohamed ◽  
Afraha Baiti Arif ◽  
Noraiham Mohamad ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Added Value ◽  
Precipitation Method ◽  
Magnetic Composite ◽  
Great Success ◽  
Composite Sheet ◽  
Biomass Waste ◽  
Co Precipitation

Biomass-derived materials such as kenaf pulp and wood chips are a perfect candidate to produce magnetic paper. Furthermore, by using biomass waste, such as paddy straw, sugarcane, bagasse and durian shell, the cost of producing magnetic paper can be further reduced while giving added value to the waste. This paper investigates the potential of producing magnetic sheet from durian shell. Initially, durian shells were dried before undergoing the pulping process. The resulted sheet was then combined with magnetic particles, the nanomagnetite using either lumen loading or in-situ co-precipitation to produce a magnetic composite sheet. After being loaded with magnetic particles, the composite sheets were tested in terms of the homogeneity of the magnetic particles in the samples, degree of loading of the magnetic particles and the magnetic properties of the samples. Results obtained show a great success in producing the magnetic sheet from durian shell waste and nanomagnetite particles. It was also found that the lumen loading method gives better magnetic properties compared to the in-situ co-precipitation method.

Characterization of magnetic microstructure at high spatial resolution

1993 ◽  
Vol 51 ◽  
pp. 4-5
Author(s):  
M.R. Scheinfein
Keyword(s):  
Magnetic Properties ◽  
Magnetic Interactions ◽  
Magnetic Domains ◽  
Length Scales ◽  
Magnetic Microstructure ◽  
Contrast Mechanism ◽  
Engineered Structures ◽  
Low Dimensional

Advances in metal epitaxial growth techniques have produced renewed interest in magnetic materials through the unique properties of novel atomically engineered structures. Ultrathin layered and nanocrystalline, textured composites possess unique magnetic properties which are intimately connected to the physical microstructure on both the atomic and nanometer length scales. The length scales present in magnetic interactions span several orders of magnitude from the atomic length scales of the exchange interaction, to the mesoscopic length scales important in anti-ferromagnetic RKKY coupling between thin ferromagnetic films and small particles, to the macroscopic length scales determined by the long range magnetostatic interactions which are responsible for the formation of magnetic domains.Special characterization and computation techniques are required to analyze the micromagnetic and microstructural properties of these novel, low dimensional systems. In order to correlate the structure with the magnetic properties of any system, in-situ growth, structural, chemical and magnetic characterization is desirable.Most methods used for the observation of micromagnetic structure rely on a contrast mechanism derived from the magnetic fields present in ferromagnetic systems. We have implemented the conventional Fresnel, and less conventional Differential Phase Contrast modes of imaging magnetic microstructure in an HB5 STEM.

Epoxy nanocomposites functionalized with in situ generated magnetite nanocrystals: Microstructure, magnetic properties, interaction among magnetic particles

Polymer ◽  
2015 ◽  
Vol 59 ◽  
pp. 278-289 ◽  
Author(s):  
Corrado Sciancalepore ◽  
Federica Bondioli ◽  
Massimo Messori ◽  
Gabriele Barrera ◽  
Paola Tiberto ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Particles ◽  
Epoxy Nanocomposites ◽  
Magnetite Nanocrystals

scholarly journals PHYTOSYNTHESIS AND CHARACTERIZATION OF IRON NANOCOMPOSITES BY IRVINGIA GABONENSIS (OGBONO) AQUEOUS AND ETHANOL LEAF EXTRACTS

2020 ◽  
Vol 8 (5) ◽  
pp. 256-265
Author(s):  
Sifon Emem Ebong ◽  
Pereware Adowei ◽  
Gloria Ukalina Obuzor
Keyword(s):  
Broad Band ◽  
Visual Observation ◽  
Spherical Particles ◽  
Nano Composites ◽  
Leaf Extracts ◽  
Nano Composite ◽  
Alcohol Extract ◽  
Irvingia Gabonensis ◽  
Ethanol Extracts

The need for emerging materials based on nano-composites from green plants, or non-useful materials for adsorption process is on the increase. The objective of this research was to evaluate the phytosynthesis and characterization of iron nano-composites (Fe.NCs) formed by aqueous and ethanol extracts of Irvingia gabonensis (Ogbono) tree leaves. The composites were characterized by visual observation, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Visual observation of the iron oxide nano-composites synthesized was confirmed by change in colour from yellow to brown within minutes of formation. The FTIR characterization showed that, phenolic groups were involved in the phytosynthesis of the iron nano-composites with the presence of –OH and –NH groups at 3348.54cm-1 and -C-N- group at 1635.69 cm-1 for aqueous extract and broad band of –OH and -NH stretch at 3363.97cm-1 and -C-H-stretch at 2978-2901.04cm-1 attributed to alkanes in alcohol extract. There was also –OH stretch at 2885.60cm-1 and Fe-O group at 671.25cm-1 in Fe. NCs with Fe-O stretch observed at 583.33cm-1 in I. gabonensis iron nano-composite. Cube-like structures, irregular shapes and sizes with individual, spherical particles forming aggregates and chains were revealed by the SEM micrographs, these are recognized attributes of strong magnetic properties of iron. The particle sizes are 30 and 45 nm for aqueous and alcohol extracts respectively, which could provide large surface area for contaminant adsorption. Conclusively, photosynthesis of Fe. NCs using water and ethanol extracts of I. gabonensis (Ogbono leaves) could be an effective one-step pathway for nano-composite production from eco-friendly, safe and less toxic green plant material.

Selective laser sintering of bonded anisotropic permanent magnets using an in situ alignment fixture

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Martin Christopher Mapley ◽  
Geoff Tansley ◽  
Jo P. Pauls ◽  
Shaun D. Gregory ◽  
Andrew Busch
Keyword(s):  
Magnetic Properties ◽  
Packing Density ◽  
Magnetic Particles ◽  
Permanent Magnets ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Powder Layer ◽  
Residual Induction ◽  
Content Type

Purpose Additive manufacturing (AM) techniques have been developed to rapidly produce custom designs from a multitude of materials. Bonded permanent magnets (PMs) have been produced via several AM techniques to allow for rapid manufacture of complex geometries. These magnets, however, tend to suffer from lower residual induction than the industry standard of injection moulding primarily due to the lower packing density of the magnetic particles and secondly due to the feedstock consisting of neodymium-iron-boron (Nd-Fe-B) powder with isotropic magnetic properties. As there is no compaction during most AM processes, increasing the packing density is very difficult and therefore the purpose of this study was to increase the magnetic properties of the PMs without increasing the part density. Design/methodology/approach Accordingly, this research investigates the use of anisotropic NdFeB feedstock coupled with an in-situ alignment fixture into an AM process known as selective laser sintering (SLS) to increase the magnetic properties of AM magnets. A Helmholtz coil array was added to an SLS machine and used to expose each powder layer during part fabrication to a near-uniform magnetic field of 20.4 mT prior to consolidation by the laser. Findings Permeagraph measurements of the parts showed that the alignment field introduced residual induction anisotropy of up to 46.4 ± 2.2% when measured in directions parallel and perpendicular to the alignment field. X-ray diffraction measurements also demonstrated a convergence of the orientation of the crystals when the magnets were processed in the presence of the alignment field. Originality/value A novel active alignment fixture for SLS was introduced and was experimentally shown to induce anisotropy in bonded PMs. Thus demonstrating a new method for the enhancement in energy density of PMs produced via AM methods.

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