کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1441913 | 1509421 | 2012 | 8 صفحه PDF | دانلود رایگان |
We reported on the synthesis and detailed physicochemical characterization of poly(1-vinyltriazole)-grafted iron oxide nanoparticles. Superparamagnetic iron oxide nanoparticles (SPION) were fabricated by gel-to-crystalline conversion method. Telomerization of poly(1-vinyltriazole) on iron oxide nanoparticles was achieved via silanization process. XRD analysis confirmed the crystalline phase as magnetite, and FT-IR analysis confirmed the presence of PVTri on nanoparticles. Particle morphology was observed to be polygonic, due to the synthesis process, while average size estimated from TEM micrographs is 7 nm. Agreement between crystallite size estimated from XRD and particle size from TEM affirms single crystalline character of these nanoparticles. Dependence of conductivity on temperature showed a strong evidence for thermally activated polarization mechanism. Temperature and frequency dependence of dielectric permittivity revealed interfacial polarization and temperature-assisted-reorganization effects. Magnetic evaluation showed non-saturation and superparamagnetic characteristics of nanoparticles as well as magnetic particles being single domains.
Synthesis scheme of poly(1-vinyltriazole)-grafted SPION.Figure optionsDownload as PowerPoint slideHighlights
► Superparamagnetic iron oxide nanoparticles (SPION) were fabricated by gel-to-crystalline conversion method.
► Telomerization of poly(1-vinyltriazole) on iron oxide nanoparticles was achieved via silanization process.
► Silica was coated on Fe3O4 nanoparticles to avoid the aggregation of the particles.
Journal: Synthetic Metals - Volume 162, Issues 7–8, May 2012, Pages 590–597