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Magnetic Properties of Co Nanoparticles in an AlMCM41 Mesoporous Host

Published online by Cambridge University Press:  21 March 2011

Jin-Seung Jung
Affiliation:
Department of Chemistry, Kangnung National University, Kangnung 210-702, South Korea Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
Jun-Yong Kim
Affiliation:
Department of Chemistry, Kangnung National University, Kangnung 210-702, South Korea
Weon-Sik Chae
Affiliation:
Department of Chemistry, Yonsei University, Seoul 120-749, South Korea
Yong-Rok Kim
Affiliation:
Department of Chemistry, Yonsei University, Seoul 120-749, South Korea
Jong-Ho Jun
Affiliation:
Department of Applied Chemistry, Konkuk University, Chungju 380-701, South Korea
Leszek Malkinski
Affiliation:
Institute of Physics, Polish Academy of Sciences, 02-668 Warszawa, Poland
Weilie Zhou
Affiliation:
Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
Amar Kumbhar
Affiliation:
Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
Marilena L. Viciu
Affiliation:
Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
John B. Wiley
Affiliation:
Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
Charles J. O'Connor
Affiliation:
Advanced Material Research Institute/ Department of Chemistry, University of New Orleans, LA 70148, USA
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Abstract

Ultrafine cobalt particles in AlMCM41 silica tubes have been synthesized by ion exchange and the reduction with sodium borohydride. The role of this stable host matrix of AlMCM41 silica is to prevent agglomeration of the magnetic particles attached to the walls of AlMCM41 silica pores. The size of the host pores naturally limits the particle dimensions and thus improves their size distribution. Both magnetic susceptibility measurements and transmission electron microscopy (TEM) show a narrow distribution size of the nanoparticles. Well controlled insertion of the magnetic material to the host channel excludes formation of bulk particles outside the host material grains, which was confirmed by the TEM studies. X-ray diffraction data did not show peaks corresponding to a crystalline cobalt, but this maybe due to small size of particles and their relatively small volume fraction. The content of Co in the AlMCM41 host was measured using both magnetic measurements and elemental analysis.

Type
Research Article
Copyright
Copyright © Materials Research Society 2001

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