Abstract:This work reports a simple and reproducible method for silica-coated multiwalled carbon nanotubes (MWCNTs) nanostructures by the sol-gel method using tetraethoxysilane and 3-aminopropyltriethoxysilane as organosilicon precursors of silica. The synthetic method is based on a noncovalent functionalization of the MWCNTs by the adsorption of the monolayers of different polyelectrolytes, such as poly(allylamine hydrochloride) and poly(sodium 4-styrene sulfonate), which are positively and negatively charged, respect… Show more
“…Different types of composites have been prepared due to their mechanical, structural, chemical, morphological and magnetic properties which are usually different compared to each phase taken alone. These advantages make nanocomposites one of the most promising candidates for the exploration of new applications compared to isolated solids containing a single phase [3][4][5][6][7] .…”
FeCo nanoparticles coated with (Fe,Co) 3 O 4 (magnetite doped with cobalt) were synthesized by the proteic sol-gel chemical route. The synthesized materials were characterized by Thermogravimetry (TG), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), vibrating-sample magnetometer (VSM) and Mössbauer spectroscopy (MS). The results show that the increase in temperature and the choice of the correct air/N 2 flow directly influence on the final physical-chemical properties of the nanocomposite. The SEM and TEM images confirmed that a thin layer of oxide was formed on the alloy, indicating that it was obtained a self-assembled FeCo-(Fe,Co) 3 O 4 nanocomposites. In addition, the VSM results show that a possible exchange-spring coupling in magnetic FeCo-(Fe,Co) 3 O 4 nanoparticles occurred with high saturation magnetization from FeCo alloy and high coercivity from (Fe,Co) 3 O 4. The rotary oven allows the uniform contact of the powder with the atmosphere of synthesis during the different oxidation-reduction steps, generating more homogeneous particles.
“…Different types of composites have been prepared due to their mechanical, structural, chemical, morphological and magnetic properties which are usually different compared to each phase taken alone. These advantages make nanocomposites one of the most promising candidates for the exploration of new applications compared to isolated solids containing a single phase [3][4][5][6][7] .…”
FeCo nanoparticles coated with (Fe,Co) 3 O 4 (magnetite doped with cobalt) were synthesized by the proteic sol-gel chemical route. The synthesized materials were characterized by Thermogravimetry (TG), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), vibrating-sample magnetometer (VSM) and Mössbauer spectroscopy (MS). The results show that the increase in temperature and the choice of the correct air/N 2 flow directly influence on the final physical-chemical properties of the nanocomposite. The SEM and TEM images confirmed that a thin layer of oxide was formed on the alloy, indicating that it was obtained a self-assembled FeCo-(Fe,Co) 3 O 4 nanocomposites. In addition, the VSM results show that a possible exchange-spring coupling in magnetic FeCo-(Fe,Co) 3 O 4 nanoparticles occurred with high saturation magnetization from FeCo alloy and high coercivity from (Fe,Co) 3 O 4. The rotary oven allows the uniform contact of the powder with the atmosphere of synthesis during the different oxidation-reduction steps, generating more homogeneous particles.
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