Colloidal stability of amino acid coated magnetite nanoparticles in physiological fluid

We investigated the surface charge effect of surface coating ligands on the colloidal stability of magnetite nanoparticles in a physiological saline solution. We employed the l-lysine and the l-glutamic acid as the surface coating ligands. We investigated the colloidal stability of the l-lysine and...

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Bibliographic Details
Published in:Materials letters 2009-02, Vol.63 (3), p.379-381
Main Authors: Park, Ja Young, Choi, Eun Sook, Baek, Myung Ju, Lee, Gang Ho
Format: Article
Language:English
Subjects:
Coatings
Colloidal stability
Nanomaterials
Surface charge effect
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Summary:We investigated the surface charge effect of surface coating ligands on the colloidal stability of magnetite nanoparticles in a physiological saline solution. We employed the l-lysine and the l-glutamic acid as the surface coating ligands. We investigated the colloidal stability of the l-lysine and the l-glutamic acid coated magnetite nanoparticles by measuring their precipitation times, hydrodynamic diameter distributions, and zeta potentials in a physiological saline solution. From these three measurements, we found that the l-lysine coated magnetite nanoparticles are more stable as colloids than the l-glutamic acid coated magnetite nanoparticles. Based on the bonding structures of the l-lysine and the l-glutamic acid to magnetite nanoparticles, we successfully discussed the colloidal stability in terms of the surface charge effect of the amino acids.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2008.10.057