scholarly journals Preparation of silica coated cobalt ferrite magnetic nanoparticles for the purification of histidine-tagged proteins

2015 ◽  
Vol 87 ◽  
pp. 64-71 ◽  
Author(s):  
Gülfem Aygar ◽  
Murat Kaya ◽  
Necati Özkan ◽  
Semra Kocabıyık ◽  
Mürvet Volkan
Keyword(s):  
Magnetic Nanoparticles ◽  
Cobalt Ferrite

scholarly journals The promoted synthesis of minoxidil by magnetic nanoparticles of cobalt ferrite(CoFe2O4) as a heterogeneous reusable catalyst

2019 ◽  
Vol 43 (5) ◽  
pp. 1425-1435
Author(s):  
Ronak EISAVI ◽  
Fatemeh AHMADI ◽  
Behzad ZEYNIZADEH ◽  
Mehri KOUHKAN
Keyword(s):  
Magnetic Nanoparticles ◽  
Cobalt Ferrite ◽  
Reusable Catalyst

scholarly journals Study of the anticorrosive properties of magnetic composites

2020 ◽  
pp. 13-18
Author(s):  
Miguel MARTINEZ-MORENO ◽  
Claudia L. GÁMEZ-DUEÑAS ◽  
Rosalba FUENTES-RAMÍREZ ◽  
David CONTRERAS-LOPEZ
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Butyl Acrylate ◽  
Cobalt Ferrite ◽  
Electrochemical Techniques ◽  
Metal Corrosion ◽  
Magnetic Composites ◽  
Ultrasonic Bath ◽  
Acrylate Copolymer ◽  
Copolymer Matrices

Metal corrosion affects various sectors: construction, ships, pipes in the chemical industry, etc. Organic materials have been used as coatings to counteract it; recently improvements have been observed when magnetic polymers are used. These are materials formed by a polymeric matrix and a metal with magnetic properties, such as magnetic nanoparticles. The metal is sacrificed, preventing contact with the surface. Here we show the results of composites formed by magnetic nanoparticles of cobalt ferrite and magnetite obtained by coprecipitation, immersed in polystyrene, butyl polyacrylate and styrene-butyl acrylate copolymer matrices. The nanoparticles were incorporated by ultrasonic bath using different weights of nanoparticles (0.05%, 0.25%, 0.5% and 1%) using toluene as solvent. There is an acceptable dispersion of the nanoparticles in the polyacrylate and copolymer after 4 hours of cavitation, the styrene had acceptable dispersion after 5 hours. The composites were tested on a 316 Cal. 14 stainless steel film of 6 cm2 area, the specimens were dipped in acid to evaluate the corrosion protection with electrochemical techniques, having good results in the ferrite and magnetite composites where the protection capacity was better in the styrene-butyl acrylate copolymer.

scholarly journals Study of the mechanical properties of magnetic composites supported on a PU matrix

2021 ◽  
pp. 8-13
Author(s):  
Miguel Martinez-Moreno ◽  
Rosalba Fuentes-Ramírez ◽  
David Contreras-Lopez ◽  
Rosario Galindo-Gonzalez
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Magnetic Nanoparticles ◽  
Phase Ii ◽  
Nickel Ferrite ◽  
Cobalt Ferrite ◽  
Magnetic Composites ◽  
Hardness Tester ◽  
Universal Machine ◽  
Tension Tests

Magnetic nanoparticles have been used to confer better properties to materials, particularly to polymers. Due the properties of the polymer, such as flexibility and lightness, combined, white nanoparticles provide other properties such as microhardness, corrosion resistance, among others. In this study, three types of nanoparticles were elaborated: magnetite, cobalt ferrite and nickel ferrite, through the coprecipitation method used in the elaboration of skin-like polyurethane (PU) -based composites. Specimens were made at different nanoparticle weights (0.1%, 0.3%, 0.5% and 1.0%). Likewise, the hardness was measured by means of a phase II Model PHT-2500 portable digital hardness tester and the tension tests were carried out on an Autograph Shimadzu universal machine. The stress results were plotted using the Jupyter Notebook for interpretation. Finding some improvements in the materials manufactured using the different ferrites already mentioned.

The use of a laponite dispersion to increase the hydrophilicity of cobalt-ferrite magnetic nanoparticles

2020 ◽  
Vol 193 ◽  
pp. 105663 ◽  
Author(s):  
A.S. Aguiar ◽  
L. Michels ◽  
F.G. da Silva ◽  
C. Kern ◽  
G. Gomide ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Cobalt Ferrite

scholarly journals Synthesis and characterization of magnetic nanoparticles of cobalt ferrite coated with silica

2019 ◽  
Vol 10 (1) ◽  
pp. 4908-4913
Keyword(s):  
Particle Size ◽  
Magnetic Nanoparticles ◽  
Cobalt Ferrite ◽  
Silica Coating ◽  
Ferrite Nanoparticles ◽  
Synthesis And Characterization ◽  
Mean Particle Size ◽  
Cobalt Ferrites ◽  
Coated Nanoparticle

There are several methods available for magnetic nanoparticles (MNP) synthesis, and in this study the coprecipitation method is employed. The cobalt ferrites (CF) were prepared using aqueous solutions of Co2+ and Fe3+ chloride with a stoichiometry proportion of Co:Fe = 1:2. Thus, the aging temperatures were 27, 27/98, 60, 80 and 98 ºC, during which the precipitation occurred at 27 °C and the aging one at 98 °C for the FC27/98 sample. As a result, the study showed that a single crystal phase material was obtained at the aging temperature of 98 °C during 1 h and with a mean particle size of 42 nm ± 7.4 nm and degree of polydispersity of 18%. The FC98/SiOH coated nanoparticle had a surface area of 11 m2 g-1, saturation magnetization of 10.05 emu g-1 a mean particle size of 773.4 nm ± 131.1 nm and a degree of polydispersity of 17 %. It was possible to confirm that it had a silica coating of cobalt ferrite nanoparticles by DRIFT and EDX indicated the presence of silica.

Application of nickel ferrite and cobalt ferrite magnetic nanoparticles in C–O bond formation: a comparative study between their catalytic activities

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59142-59153 ◽  
Author(s):  
Firouz Matloubi Moghaddam ◽  
Ghazal Tavakoli ◽  
Ali Aliabadi
Keyword(s):  
Magnetic Nanoparticles ◽  
Comparative Study ◽  
Nickel Ferrite ◽  
Cobalt Ferrite ◽  
Bond Formation ◽  
Coupling Reaction ◽  
Ferrite Nanoparticles ◽  
Catalytic Activities ◽  
Cobalt Ferrite Nanoparticles ◽  
First Time

Magnetic reusable nickel- and cobalt ferrite nanoparticles were used as catalysts for the first time in the C–O coupling reaction successfully.

scholarly journals Green Synthesis of Co-Zn Spinel Ferrite Nanoparticles: Magnetic and Intrinsic Antimicrobial Properties

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5014
Author(s):  
Alexander Omelyanchik ◽  
Kateryna Levada ◽  
Stanislav Pshenichnikov ◽  
Maryam Abdolrahim ◽  
Miran Baricic ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Chemical Composition ◽  
Saturation Magnetization ◽  
Cobalt Ferrite ◽  
Spinel Ferrite ◽  
Ferrite Nanoparticles ◽  
Ferromagnetic Behavior ◽  
Wide Range ◽  
Auto Combustion

Spinel ferrite magnetic nanoparticles have attracted considerable attention because of their high and flexible magnetic properties and biocompatibility. In this work, a set of magnetic nanoparticles of cobalt ferrite doped with zinc was synthesized via the eco-friendly sol-gel auto-combustion method. Obtained particles displayed a room-temperature ferromagnetic behavior with tuned by chemical composition values of saturation magnetization and coercivity. The maximal values of saturation magnetization ~74 Am2/kg were found in cobalt ferrite nanoparticles with a 15–35% molar fraction of cobalt replaced by zinc ions. At the same time, the coercivity exhibited a gradually diminishing trend from ~140 to ~5 mT whereas the concentration of zinc was increased from 0 to 100%. Consequently, nanoparticles produced by the proposed method possess highly adjustable magnetic properties to satisfy the requirement of a wide range of possible applications. Further prepared nanoparticles were tested with bacterial culture to display the influence of chemical composition and magnetic structure on nanoparticles-bacterial cell interaction.

Microwave absorbers designed from PVDF/SAN blends containing multiwall carbon nanotubes anchored cobalt ferrite via a pyrene derivative

2015 ◽  
Vol 3 (23) ◽  
pp. 12413-12426 ◽  
Author(s):  
Sourav Biswas ◽  
Goutam Prasanna Kar ◽  
Suryasarathi Bose
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Nanoparticles ◽  
Polyvinylidene Fluoride ◽  
Cobalt Ferrite ◽  
Multiwall Carbon Nanotubes ◽  
Electromagnetic Shielding ◽  
Microwave Absorbers ◽  
Multiwall Carbon

Lightweight and flexible electromagnetic shielding materials were designed by selectively localizing multiwall carbon nanotubes (MWNTs) anchored magnetic nanoparticles in melt mixed co-continuous blends of polyvinylidene fluoride (PVDF) and poly(styrene-co-acrylonitrile) (SAN).

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