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.

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.

Role of SDS surfactant concentrations on the structural, morphological, dielectric and magnetic properties of CoFe2O4 nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 27060-27068 ◽  
Author(s):  
M. Vadivel ◽  
R. Ramesh Babu ◽  
M. Arivanandhan ◽  
K. Ramamurthi ◽  
Y. Hayakawa
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Sodium Dodecyl Sulfate ◽  
Cobalt Ferrite ◽  
Sodium Dodecyl ◽  
Cofe2o4 Nanoparticles ◽  
Dodecyl Sulfate ◽  
Sds Surfactant

Schematic illustration of the synthesis of sodium dodecyl sulfate (SDS) added to cobalt ferrite (CoFe2O4) magnetic nanoparticles at various concentrations (0.04 and 0.08 M) and their morphological and magnetic characterizations.

scholarly journals Effect of coverage on the magnetic properties of -COOH, -SH, and -NH2 ligand-protected cobalt nanoparticles

Nanoscale ◽  
2021 ◽  
Author(s):  
Barbara Farkas ◽  
Nora Henriette De Leeuw
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Cobalt Nanoparticles ◽  
Magnetic Behaviour

Implementation of magnetic nanoparticles in biomedicine requires their passivation, which often comes at a cost of diminished magnetic properties. For the design of nano-agents with targeted magnetic behaviour, it is...

Sign in / Sign up

Export Citation Format

Share Document