Iron oxide nanoparticles embedded onto 3D mesochannels of KIT-6 with different pore diameters and their excellent magnetic properties

Alam, Sher, Anand, Chokkalingam, Zaidi, S. M. J., Naidu, Talapaneni Siddulu, Al-Deyab, Salem S. and Vinu, Ajayan (2011) Iron oxide nanoparticles embedded onto 3D mesochannels of KIT-6 with different pore diameters and their excellent magnetic properties. Chemistry - An Asian Journal, 6 3: 834-841. doi:10.1002/asia.201000456


Author Alam, Sher
Anand, Chokkalingam
Zaidi, S. M. J.
Naidu, Talapaneni Siddulu
Al-Deyab, Salem S.
Vinu, Ajayan
Title Iron oxide nanoparticles embedded onto 3D mesochannels of KIT-6 with different pore diameters and their excellent magnetic properties
Journal name Chemistry - An Asian Journal   Check publisher's open access policy
ISSN 1861-4728
1861-471X
Publication date 2011-03-01
Sub-type Article (original research)
DOI 10.1002/asia.201000456
Volume 6
Issue 3
Start page 834
End page 841
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley
Language eng
Abstract Here, we report the results of our detailed study on the fabrication of iron oxide magnetic nanoparticles confined in mesoporous silica KIT-6 with a 3D structure and large, tunable pore diameters. It was confirmed by XRD, nitrogen adsorption, high-resolution (HR) TEM, and magnetic measurements that highly dispersed iron oxide nanoparticles are occupied inside the mesochannels of KIT-6. We also demonstrated that the size of the iron oxide nanoparticle can be controlled by simply changing the pore diameter of the KIT-6 and the weight percentage of the iron oxide nanoparticles. The effect of the weight percentage and size of the iron oxide nanoparticles, and the textural parameters of the support on the magnetic properties of iron oxide/KIT-6 has been demonstrated. The magnetization increases with decreasing iron content in the pore channels of KIT-6, whereas coercivity decreases for the same samples. Among the KIT-6 materials studied, KIT-6 with 7.5 wt % of iron showed the highest saturation magnetic moment and magnetic remanence. However, all the samples register a coercivity of around 2000 Oe, which is generally observed for the hard magnetic materials. In addition, we have found a paramagnetic-to-superparamagnetic transition at low temperature for samples with different iron content at low temperature. The cause for this exciting transition is also discussed in detail. Magnetic properties of the iron oxide loaded KIT-6 were also compared with pure iron oxide and iron oxide loaded over SBA-15. It was found that iron oxide loaded KIT-6 showed the highest magnetization due to its 3D structure and large pore volume. The pore diameter of the iron oxide loaded KIT-6 support also plays a critical role in controlling the magnetization and the blocking temperature, which has a direct relation to the particle diameter and increases from 48 to 63 K with an increase in the pore diameter of the support from 8 to 11.3 nm.
Keyword Iron oxide
Magnetic properties
Mesoporous materials
Nanocomposites
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 8 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Tue, 16 Oct 2012, 11:04:49 EST by System User on behalf of Aust Institute for Bioengineering & Nanotechnology