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Synthesis and Magnetic Tuning in Superparamagnetic Cobaltocene–Mesoporous Niobium Oxide Composites
Author(s) -
Murray S.,
Trudeau M.,
Antonelli D. M.
Publication year - 2000
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(200009)12:18<1339::aid-adma1339>3.0.co;2-t
Subject(s) - cobaltocene , superparamagnetism , materials science , mesoporous material , oxide , paramagnetism , niobium , niobium oxide , composite material , chemical engineering , nanotechnology , magnetization , condensed matter physics , metallurgy , metallocene , polymerization , organic chemistry , polymer , magnetic field , catalysis , physics , chemistry , quantum mechanics , engineering
Superparamagnetic behavior in a molecular aggregate is reported here for the first time. Mesoporous niobium oxide loaded with increasing levels of cobaltocene contains varying ratios of Co II to Co III (see Figure). A subtle increase is seen to lead to a dramatic change in the magnetic properties—from paramagnetic to superparamagnetic, which makes the composites potentially useful in sensor technology.