scholarly journals Theory, simulation and experiment of optical properties of cobalt ferrite (CoFe2O4) nanoparticles

2020 ◽  
Vol 57 ◽  
pp. 180-187
Author(s):  
Elham Gharibshahi ◽  
Brandon D. Young ◽  
Amar S. Bhalla ◽  
Ruyan Guo
Keyword(s):  
Optical Properties ◽  
Cobalt Ferrite ◽  
Cofe2o4 Nanoparticles ◽  
Simulation And Experiment

scholarly journals Impact of Magneto-optical Properties Depending on the Orientation in the Plane of Cobalt Ferrite Locked in a Silica Matrix

2021 ◽  
pp. 46-50
Author(s):  
Nandiguim Lamaï ◽  
Désiré Allassem ◽  
Alexis Mouangué Nanimina ◽  
Djimako Bongo ◽  
Togdjim Jonas
Keyword(s):  
Optical Properties ◽  
Faraday Effect ◽  
Cobalt Ferrite ◽  
Magnetic Moments ◽  
Silica Matrix ◽  
Preferential Orientation ◽  
Solid Matrix ◽  
Magnetic Orientation

In this work, we discuss the magneto-optical properties according to the orientation of 15nm-sized cobalt ferrite blocked in a silica matrix in comparison to the study done on 20nm-sized cobalt ferrite. This measurement shows that it is possible to increase the remanence of the Faraday effect by creating a magnetic orientation in the solid matrix, which is interesting for the production of self-polarized components. In addition, this remanence is greater for 15 nm than for 20 nm.A gelation field applied perpendicular to the plane of the layer therefore produces a preferential orientation of the magnetic moments in the direction of the field applied during the measurement.

Optical properties of Gd3+ substituted CoFe2O4 Nanoparticles

2019 ◽  
Author(s):  
Seema Josh ◽  
Manoj Kumar ◽  
Himanshu Pandey ◽  
Sandeep Chhoker
Keyword(s):  
Optical Properties ◽  
Cofe2o4 Nanoparticles

scholarly journals SINTESIS NANOPARTIKEL COBALT FERRITE (CoFe2O4) DENGAN METODE KOPRESIPITASI DAN APLIKASINYA SEBAGAI FOTOKATALIS

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Suaib Suaib ◽  
Henry Aritonang ◽  
Harry S. J. Koleangan
Keyword(s):  
Methylene Blue ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Exposure Time ◽  
Contact Time ◽  
Cobalt Ferrite ◽  
Cofe2o4 Nanoparticles ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Scanning Electron

ABSTRAKTelah dilakukan penelitian tentang kemampuan fotokatalis nanopartikel CoFe2O4 dalam mendegradasi zat warna sintetik Methylene Blue (MB) menggunakan metode kopresipitasi. Nanopartikel tersebut dikarakterisasi menggunakan X-Ray Diffractometry (XRD), Scanning Electron Microscope (SEM) dan spektroskopi UV-vis. Kemampuan fotokatalis dilakukan melalui penentuan konsentrasi Methylene Blue yang tersisa setelah waktu kontak nanopartikel CoFe2O4 dengan larutan Methylene Blue 5 ppm yang disinari sinar UV-A selama 30, 45, 60, 90 dan 120 menit.  Penentuan konsentrasi dihitung berdasarkan absorbansi yang didapatkan dari hasil pembacaan uji Spektrofotometri UV-vis lalu digunakan rumus menghitung % degradasi. Hasil penelitian menunjukkan bahwa kemampuan fotokatalis paling baik adalah nanopartikel CoFe2O4 dengan nilai % degradasi untuk variasi waktu penyinaran 60 menit adalah sebesar 40,72 %. ABSTRACTA research on the ability of CoFe2O4 nanoparticles degradation of as photocatalyst to dyemethylene Blue(MB) synthetic using coprecipitation method. The nanoparticles were characterized using X-ray diffractometry (XRD), Scanning Electron Microscope (SEM) and UV-Vis spectroscopy. The ability of the photocatalyst is done by determining the concentration of Methylene Blue residu after contact time of CoFe2O4 nanoparticleswith a solution of Methylene Blue 5 ppm irradiated UV-A for 30, 45, 60, 90 and 120 minutes. Determining the concentration is calculated based on the absorbance obtained from the results of analysis UV-vis spectrophotometry and then used a formula calculating the% degradation. The results showed that ability is the best photocatalyst CoFe2O4 nanoparticles with the value of% degradation for variations in exposure time of 60 minutes is equal to 40.72 %. 

Rheological behavior of magnetic pulp fiber suspensions

TAPPI Journal ◽  
2021 ◽  
Vol 20 (6) ◽  
pp. 393-403
Author(s):  
JORGE SANCHEZ ◽  
XIOMARA PINEDA ◽  
GERMAN QUINTANA ◽  
ADRIANA P. HERRERA
Keyword(s):  
Magnetic Field ◽  
Yield Stress ◽  
Applied Field ◽  
Cobalt Ferrite ◽  
Pulp Fiber ◽  
Fiber Suspensions ◽  
Cofe2o4 Nanoparticles ◽  
Pulp Suspensions ◽  
Loading Method ◽  
Negative Effect

This paper is focused on the rheology of magnetic pulp suspensions in absence and presence of an external magnetic field. Magnetic fibers were prepared by the lumen loading method using bleached eucalyptus fibers and cobalt ferrite (CoFe2O4) nanoparticles. The effect of mass consistency, temperature, concentration of magnetic fibers, and magnetic field strength on yield stress and apparent viscosity of the suspensions were investigated. In the absence of an applied field, a dependence of yield stress with consistency, as well as with the percentage of magnetic fibers present in the suspension, was found. In flow tests, all the suspensions exhibited shear-thinning behavior, showing that the viscosity is only affected by the consistency of the suspension. On the other hand, magnetorheological measurements show a negative effect of the applied magnetic field on the viscosity of the suspension.

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