Premium
CS‐Fe(II,III) complex as precursor for magnetite nanocrystal
Author(s) -
Wang Yongliang,
Li Baoqiang,
Zhou Yu,
Jia Dechang,
Song Yang
Publication year - 2011
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1657
Subject(s) - magnetite , nanocrystal , nucleation , chelation , x ray photoelectron spectroscopy , materials science , chitosan , alkali metal , inorganic chemistry , nuclear chemistry , chemical engineering , chemistry , nanotechnology , metallurgy , organic chemistry , engineering
Abstract Chitosan‐iron ions complex (CS‐Fe(II,III) complex) was used as precursor to synthesize magnetite nanocrystals and the mechanism was discussed. The magnetite nanocrystals have diameters of about 10 nm and clusters were formed due to slight aggregation of several magnetite nanocrystals. FT‐IR and X‐ray photoelectron spectrometer (XPS) investigations indicated that the Fe(II) and Fe(III) were chelated by NH 2 and OH groups of chitosan in CS‐Fe(II,III) complex, and the molar ratio of NH 2 /Fe(II,III) was approximately 2. This chelation effect destroyed the hydrogen bonds of chitosan. In the following alkali treatment process, the chelated Fe(II) and Fe(III) provided nucleation site and formed the magnetite nanocrystals. After alkali treatment, the chelation effect between iron ions and NH 2 groups disappeared and some kind of weak interaction formed between magnetite and NH 2 groups. Moreover, the OH groups of chitosan have an interaction with the synthesized magnetite nanocrystals. Copyright © 2010 John Wiley & Sons, Ltd.