New approach for understanding experimental NMR relaxivity properties of magnetic nanoparticles: focus on cobalt ferrite

2016 ◽  
Vol 18 (48) ◽  
pp. 32981-32991 ◽  
Author(s):  
Anne-Laure Rollet ◽  
Sophie Neveu ◽  
Patrice Porion ◽  
Vincent Dupuis ◽  
Nadine Cherrak ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Cobalt Ferrite ◽  
Nmr Relaxation ◽  
New Approach

Relaxivities r1 and r2 of cobalt ferrite magnetic nanoparticles (MNPs) have been investigated in the aim of improving the models of NMR relaxation induced by magnetic nanoparticles.

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 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 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.

A new approach for bioassays based on frequency- and time-domain measurements of magnetic nanoparticles

2010 ◽  
Vol 25 (5) ◽  
pp. 1008-1013 ◽  
Author(s):  
Fredrik Öisjöen ◽  
Justin F. Schneiderman ◽  
Andrea Prieto Astalan ◽  
Alexey Kalabukhov ◽  
Christer Johansson ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Time Domain ◽  
New Approach
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