Free-standing block copolymer films containing magnetic
iron oxide nanoclusters within
the microdomains were produced by static casting. The thickness of
the nanocomposite films
was easily controlled to make optically transparent thin films.
The size distribution of the
nanoclusters was relatively narrow and the nanoclusters were uniformly
distributed within
the films. The spherical nanoclusters, ca. 5 nm in diameter, were
identified as γ-Fe2O3 and
had a well-defined crystalline structure. Magnetic measurements
revealed that the
nanocomposite films are superparamagnetic.
Silver cluster formation in bulk block copolymer films (static-cast) and in thin films (microtomed or spin-coated) was investigated by transmission electron microscopy. In all cases, the silver clusters were formed predominantly within the original silver-containing microdomains. A greater degree of control of cluster formation and a narrower cluster size distribution were achieved in the thin films of block copolymers. The interfaces between domains of the heterogeneous copolymers and the free interfaces of the thin film specimens all played an important role in nucleation and growth of clusters.Das Bitch spricht insbesondere fortgeschrittene Studenten der IngeiiieiiMiissenschafleri an, die einen fundierten Einstieg in dieses dktuelle Forschungsthema suchen. Auch geslatidene Fachleute kiinneri sich hier einen guien Uberblick uber die theoretischen uiid experimentellen Grundlagen der Mikrosysletiitechtiik verschaffen. W i s s e n i s t Z u k u n f t Acta Polymer., 47, 340-343 (1996) Silver nanocluster formation
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