Synthesis of Ni–SiO2 composite microspheres in situ in ethylene glycol
| Autor: | Qingping Xiao, Dachuan Zhu, Jin Zhang, Tao Han, Mingjing Tu |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Polyvinylpyrrolidone Scanning electron microscope Composite number Biomedical Engineering Analytical chemistry Nanoparticle chemistry.chemical_element Bioengineering Condensed Matter Physics chemistry.chemical_compound Nickel chemistry Chemical engineering Transmission electron microscopy Stöber process medicine General Materials Science Ethylene glycol medicine.drug |
| Zdroj: | Micro & Nano Letters. 6:378 |
| ISSN: | 1750-0443 |
| DOI: | 10.1049/mnl.2011.0197 |
| Popis: | In this study, the Ni–SiO2 composite microspheres were synthesised in situ in ethylene glycol. The nickel colloidal suspension was synthesised by hydrazine reduction in ethylene glycol with the addition of polyvinylpyrrolidone, and then coated on by silica using the modified Stober process. The as-synthesised samples were characterised by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and vibrating sample magnetometer. XRD patterns showed that as-prepared nickel colloids are consistent with face-centred cubic phase and the broad peak at around 25° is attributed to amorphous SiO2 in Ni–SiO2 composite microspheres. TEM and SEM images indicated as-obtained Ni–SiO2 composite microspheres appear near spherical with a size of about 100–200 nm, and get well dispersed. Magnetisation curves demonstrated the saturation magnetisation value of as-prepared Ni–SiO2 composite microspheres is 4.4 emu/g with the content of nickel of about 20 wt.%. |
| Databáze: | OpenAIRE |
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