The influence of composition and porosity on the magnetic properties of FeCo-SiO2 nanocomposite aerogels

被引：27

作者：

Casu, Alberto ^{[1
,2
]}

Casula, Maria Francesca ^{[1
,2
]}

Corrias, Anna ^{[1
,2
]}

Falqui, Andrea ^{[1
,2
]}

Loche, Danilo ^{[1
,2
]}

Marras, Sergio ^{[1
,2
]}

Sangregorio, Claudio ^{[3
,4
]}

机构：

[1] Cittadella Univ, Univ Cagliari, Dipartimento Sci Chim, I-09042 Monserrato, CA, Italy

[2] Cittadella Univ, Univ Cagliari, INSERM, I-09042 Monserrato, Italy

[3] Univ Florence, Dipartimento Chim, I-50019 Sesto Fiorentino, FI, Italy

[4] Cittadella Univ, Univ Cagliari, INSERM, I-09042 Monserrato, CA, Italy

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2008年 / 10卷 / 07期

关键词：

D O I：

10.1039/b712719g

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

FeCo-SiO2 aerogel nanocomposites with different porosity were obtained using two different sol-gel procedures: the first involves a single acidic step and gives rise to relatively dense aerogels while the second procedure allows one to obtain highly porous aerogels using urea in the second step to promote fast gelation. Samples with different loading of FeCo equimolar alloy and with different Fe:Co ratios were prepared. The magnetic properties of all the nanocomposite aerogels were extensively studied as a function of porosity and composition. Particular attention was paid to the role played by the interparticle interactions, which are mediated by the silica matrix, in determining the collective magnetic behaviour. The kind and strength of magnetic interactions are affected by both the composition and the porosity of the matrix.

引用

页码：1043 / 1052

页数：10

共 47 条

[1] Magnetic properties of CoFe2O4 nanoparticles synthesized through a block copolymer nanoreactor route [J].