Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 072100-072103 |
| Numero di pagine | 4 |
| Rivista | JOURNAL OF PHYSICS. CONFERENCE SERIES |
| Volume | 200 |
| Stato di pubblicazione | Published - 2010 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Magnetic properties of colloidal cobalt nanoclusters. / Turco Liveri, Vincenzo; Ruggirello, Angela Monia; Capellini; Neisius; García Prieto; Fdez-Gubieda; Mobilio; Longo, Alessandro; Meneghini; Alonso; Torchio.
In: JOURNAL OF PHYSICS. CONFERENCE SERIES, Vol. 200, 2010, pag. 072100-072103.Risultato della ricerca: Article
}
TY - JOUR
T1 - Magnetic properties of colloidal cobalt nanoclusters
AU - Turco Liveri, Vincenzo
AU - Ruggirello, Angela Monia
AU - Capellini, null
AU - Neisius, null
AU - García Prieto, null
AU - Fdez-Gubieda, null
AU - Mobilio, null
AU - Longo, Alessandro
AU - Meneghini, null
AU - Alonso, null
AU - Torchio, null
PY - 2010
Y1 - 2010
N2 - Abstract. Co nanoclusters were synthesized by an inverse-micelle chemical route. The magnetic and microstructural properties of the nanoparticles have been analyzed as a function of the surfactant (AOT and DEHP) and the drying method. Microstructural analysis has been performed by TEM and XANES; magnetic properties have been studied by hysteresis loops and zero-field cooling - field cooling (ZFC-FC) curves. TEM images show 2 to 4 nm sized particles spherical in shape. XANES measurements point out a significant presence of Co3O4 with metallic Co and some Co2+ bound to the surfactant. The presence of antiferromagnetic Co3O4 explains the magnetic transition observed at low T in both ZFC-FC measurements and hysteresis loops. Finally, the presence of magnetic interactions explains the bigger effective cluster size obtained from hysteresis loops fits (6-10 nm) compared to the sizes observed by TEM (2-4 nm).
AB - Abstract. Co nanoclusters were synthesized by an inverse-micelle chemical route. The magnetic and microstructural properties of the nanoparticles have been analyzed as a function of the surfactant (AOT and DEHP) and the drying method. Microstructural analysis has been performed by TEM and XANES; magnetic properties have been studied by hysteresis loops and zero-field cooling - field cooling (ZFC-FC) curves. TEM images show 2 to 4 nm sized particles spherical in shape. XANES measurements point out a significant presence of Co3O4 with metallic Co and some Co2+ bound to the surfactant. The presence of antiferromagnetic Co3O4 explains the magnetic transition observed at low T in both ZFC-FC measurements and hysteresis loops. Finally, the presence of magnetic interactions explains the bigger effective cluster size obtained from hysteresis loops fits (6-10 nm) compared to the sizes observed by TEM (2-4 nm).
KW - cobalt nanoparticles
UR - http://hdl.handle.net/10447/50909
M3 - Article
VL - 200
SP - 72100
EP - 72103
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
ER -