Transmission electron microscopy and scanning electron microscopy were used
to investigate chemically cycled magnetite-based composites using mesoporo
us sulfonated styrene-divinylbenzene copolymer as template, The micron-size
d morphology of the template was investigated using scanning electron micro
scopy, while transmission electron microscopy provided useful information c
oncerning the nanoparticle size polydispersity profile and location of the
magnetite nanoparticles inside the template. The narrowing of the nanoparti
cle size distribution and the linear dependence of the magnetite mass incor
poration versus number of chemical cycles are supported by the transmission
electron microscopy data.