Magnetic properties of Co nanoparticles in an AlMCM41 mesoporous host

Jin Seung Jung, Jun Yong Kim, Weon Sik Chae, Yong Rok Kim, Jong Ho Jun, Leszek Malkinski, Weilie Zhou, Amar Kumbhar, Marilena L. Viciu, John B. Wiley, Charles J. O'Connor

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)Y3.45.1-Y3.45.5
JournalMaterials Research Society Symposium - Proceedings
Volume676
DOIs
Publication statusPublished - 2001
EventSynthesis, Functional Properties and Applications of Nanostructures - San Francisco, CA, United States
Duration: 2001 Apr 172001 Apr 20

Bibliographical note

Funding Information:
This work was supported by grant No. 1999-2-121-004-5 from the interdisciplinary Research program of the KOSEF and also Konkuk Univ. ( J-H. J ), South Korea, and by the U.S Department of Defence ( DARPA MDA 972-97-1-0003 ).

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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