scholarly journals The Effect of SrO Impregnation on The Characteristics of Cobalt Ferrite (CoFe2O4) Nanoparticles Synthesized by Coprecipitation

2020 ◽  
Vol 833 ◽  
pp. 012086
Author(s):  
Thutug Rahardiant Primadi ◽  
Aman Santoso ◽  
Fauziatul Fajaroh
Keyword(s):  
Cobalt Ferrite ◽  
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.

scholarly journals The Effect of Sr-CoFe2O4 Nanoparticles with Different Particles Sized as Additives in CIP-Based Magnetorheological Fluid

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3684
Author(s):  
Kacuk Cikal Nugroho ◽  
Ubaidillah Ubaidillah ◽  
Retna Arilasita ◽  
Margono Margono ◽  
Bambang Hari Priyambodo ◽  
...  
Keyword(s):  
Room Temperature ◽  
Cobalt Ferrite ◽  
Iron Particle ◽  
Magnetorheological Fluid ◽  
Particle Sizes ◽  
Cofe2o4 Nanoparticles ◽  
Calcination Temperatures ◽  
Grain Sizes ◽  
Co Precipitation ◽  
Nanoparticle Additives

This study investigated the effect of adding strontium (Sr)-doped cobalt ferrite (CoFe2O4) nanoparticles in carbonyl iron particle (CIP)-based magnetorheological fluids (MRFs). Sr-CoFe2O4 nanoparticles were fabricated at different particle sizes using co-precipitation at calcination temperatures of 300 and 400 °C. Field emission scanning electron microscopy (FESEM) was used to evaluate the morphology of the Sr-CoFe2O4 nanoparticles, which were found to be spherical. The average grain sizes were 71–91 nm and 118–157 nm for nanoparticles that had been calcinated at 300 and 400 °C, respectively. As such, higher calcination temperatures were found to produce larger-sized Sr-CoFe2O4 nanoparticles. To investigate the rheological effects that Sr-CoFe2O4 nanoparticles have on CIP-based MRF, three MRF samples were prepared: (1) CIP-based MRF without nanoparticle additives (CIP-based MRF), (2) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 300 °C (MRF CIP+Sr-CoFe2O4-T300), and (3) CIP-based MRF with Sr-CoFe2O4 nanoparticles calcinated at 400 °C (MRF CIP+Sr-CoFe2O4-T400). The rheological properties of these MRF samples were then observed at room temperature using a rheometer with a parallel plate at a gap of 1 mm. Dispersion stability tests were also performed to determine the sedimentation ratio of the three CIP-based MRF samples.

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