Synthesis of aqueous suspensions of magnetic nanoparticles with the co-precipitation of iron ions in the presence of aspartic acid

2016 ◽  
Vol 413 ◽  
pp. 65-75 ◽  
Author(s):  
Klementina Pušnik ◽  
Tanja Goršak ◽  
Miha Drofenik ◽  
Darko Makovec
Keyword(s):  
Magnetic Nanoparticles ◽  
Aspartic Acid ◽  
Iron Ions ◽  
Aqueous Suspensions ◽  
Co Precipitation

Template Induced Synthesis of Nano-Hydroxyapatite by Co-Precipitation Method

2011 ◽  
Vol 311-313 ◽  
pp. 1713-1716 ◽  
Author(s):  
Yan Rong Sun ◽  
Tao Fan ◽  
Chang An Wang ◽  
Li Guo Ma ◽  
Feng Liu
Keyword(s):  
Electron Microscope ◽  
Chondroitin Sulfate ◽  
Aspartic Acid ◽  
Transmission Electron Microscope ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Transmission Electron ◽  
Co Precipitation

Nano-hydroxyapatite with different morphology was synthesized by the co-precipitation method coupled with biomineralization using Ca(NO3)2•4H2O and (NH4)2HPO4 as reagents, adding chondroitin sulfate, agarose and aspartic acid as template. The structure and morphology of the prepared powders were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM).

Heating of Zn-Substituted Manganese Ferrite Magnetic Nanoparticles in Alternating Magnetic Field

2015 ◽  
Vol 233-234 ◽  
pp. 761-765
Author(s):  
T.M. Elkhova ◽  
A.K. Yakushechkina ◽  
A.S. Semisalova ◽  
Y.K. Gun’ko ◽  
Yu.I. Spichkin ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Specific Absorption Rate ◽  
Metal Salt ◽  
Relaxation Mechanism ◽  
Manganese Ferrite ◽  
Zn Content ◽  
Magnetic Liquids ◽  
Naoh Solution ◽  
Brown Relaxation ◽  
Co Precipitation

In this report, were studied the heating capability of magnetic nanoparticles (MNps) made from Zn-substituted manganese ferrite compounds ZnxMn1-xFe2O4 with Zn content varying from 0% to 90%. The MNps of diameter 5-25 nm were synthesized by co-precipitation of metal salt solution with NaOH solution. It was shown, that specific absorption rate (SAR) for the compound with Zn content of 20% is bigger than the other ones exhibited 1.5 W/g. Also SAR for the magnetic liquids made of the MNps shows bigger SAR values, which indicates the Brown relaxation mechanism in the system.

Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution

2014 ◽  
Vol 70 (6) ◽  
pp. 1004-1010 ◽  
Author(s):  
Th. I. Shalaby ◽  
N. M. Fikrt ◽  
M. M. Mohamed ◽  
M. F. El Kady
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Transmission Electron ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

Study on γ-Fe2O3 Magnetic Fluid by Thermal Oxidizing of Fe3O4 Nanoparticles

2015 ◽  
Vol 713-715 ◽  
pp. 2916-2919
Author(s):  
Hang Zheng ◽  
Hui Ping Shao ◽  
Zi Fen Zhao
Keyword(s):  
Surface Modification ◽  
Oleic Acid ◽  
Magnetic Nanoparticles ◽  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Silicone Oil ◽  
Precipitation Method ◽  
Carrier Liquid ◽  
Co Precipitation

In this paper, Fe3O4magnetic nanoparticles were synthesized by chemical co-precipitation method and their surface was modified by sodium oleate. The γ-Fe2O3magnetic nanoparticles were achieved by thermal oxidizing of Fe3O4. The γ-Fe2O3magnetic fluid was prepared by using silicone oil as carrier liquid and oleic acid as surface modification agent, and the saturation magnetization of prepared γ-Fe2O3magnetic fluid hits 14.25emu/g.

Assessment of polydopamine coated magnetic nanoparticles in doxorubicin delivery

RSC Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 5936-5943 ◽  
Author(s):  
Radosław Mrówczyński ◽  
Justyna Jurga-Stopa ◽  
Roksana Markiewicz ◽  
Emerson L. Coy ◽  
Stefan Jurga ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Hela Cells ◽  
Oxidative Polymerization ◽  
Precipitation Method ◽  
Doxorubicin Delivery ◽  
Co Precipitation

Magnetic nanoparticles coated with bioinspired polydopamine were obtained via a co-precipitation method and oxidative polymerization of dopamine. Obtained particle were used for carrying doxorubicin to HeLa cells.

Synthesizing Magnetic Nanocomposite Fibers by Electrospinning Method

2008 ◽  
Author(s):  
R. Asmatulu ◽  
W. Khan ◽  
K. D. Nguyen ◽  
M. B. Yildirim
Keyword(s):  
Magnetic Nanoparticles ◽  
Ammonium Hydroxide ◽  
Magnetic Nanocomposite ◽  
Ferrous Chloride ◽  
Inorganic Particles ◽  
Electrospinning Method ◽  
Nanocomposite Fibers ◽  
Co Precipitation ◽  
Chloride Salts ◽  
Poly Acrylonitrile

Flexible magnetic nanocomposite fibers were produced by electrospinning method using a polymeric solution containing poly(acrylonitrile) and magnetite nanoparticles. Magnetic nanoparticles (∼10 nm) were prepared by a chemical co-precipitation of ferric and ferrous chloride salts in the presence of an ammonium hydroxide solution. The effect of magnetic particle concentrations (e.g., 0%, 1%, 5%, 10%, 20% and 30%) on nanocomposite fibers, distribution and morphology were studied using scanning electron microscopy (SEM). The experimental study indicated that the average diameters of the magnetic nanocomposite fibers were between 400 nm and 1.08 μm. The magnetic responds were also found to increase linearly with increasing percent loading of the magnetic nanoparticles. It is concluded that this study provides promising results for various applications, such as filtration and separation of micron and nanosize organic and inorganic particles, HF antenna fabrication and biomedical.

scholarly journals MAGNETIC NANOPARTICLES IN BIOCATALYSIS

2021 ◽  
pp. 66-72
Author(s):  
Александрина Михайловна Сульман ◽  
Ольга Валентиновна Гребенникова ◽  
Анастасия Евгеньевна Филатова
Keyword(s):  
Magnetic Nanoparticles ◽  
Horseradish Peroxidase ◽  
Kinetic Parameters ◽  
Magnetic Particles ◽  
Ph Value ◽  
Co Precipitation ◽  
Optimal Ph

В работе изучены свойства ферментативных систем на основе иммобилизованной на магнитные частицы пероксидазы корня хрена (HRP). Магнитные наночастицы FeO были синтезированы методом соосаждения. Затем на их поверхность двумя способами была иммобилизована пероксидаза корня хрена путем ковалентной сшивки. Для этого, в первом случае, FeO последовательно обрабатывали тетраэтоксисиланом, 3-аминопропилтриэтоксисиланом, глутаровым диальдегидом и HRP. Во втором, перед иммобилизацией HRP на поверхность носителя были последовательно нанесены 3-аминопропилтриэтоксисилан, глутаровым диальдегидом и HRP. Активность синтезированных биокатализаторов оценивалась спектрофотометрически в реакции окисления 2,2'-азино-бис(3-этилбензотиазолин-6-сульфонат) аммония пероксидом водорода. В работе также были рассчитаны кинетические параметры K и V для всех типов катализаторов, в том числе для нативной HRP. Среди всех биокаталитических систем лучшие значения, по сравнению с нативным ферментом (K = 4 ммоль/л и V = 12.6∙10, ммоль/л∙с) , были получены для первого типа биокатализатора (K = 5 ммоль/л и V = 2.5∙10, ммоль/л∙с). Было также определено, что оптимальным значением рН является 7.2. The synthesis of biocatalytic systems based on horseradish peroxidase immobilized on magnetic particles was investigated. The method of co-precipitation was used to obtain magnetic nanoparticles. Two types of magnetic particles were studied: untreated and pretreated with tetraethoxysilane. The basic kinetic parameters KM and Vm were calculated for all types of biocatalysts. The optimal pH value was determined for the biocatalyst that showed the greatest activity during oxidation

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