| Abstrak/Abstract |
Nano-sized chitosan has been prepared by ball mill (High Energy Milling) with 1500 rpm
to determine itsgrainz size and functional group. A nanopowder sample was prepared in the various
milling time of the precusor. The milling time were 60, 120, 180, 240, 300 and 360 minutes. The
Scanning Electron Microscopy (SEM)images indicated that the microstructures and grain size of asprepared chitosan changed by increasing the milling time. The average of grain size is 15,1 nm. The
Fourier Transform Infra-Red (FTIR) spectra showedthat the -OH bond shifted after milling process.
The new C=O groups formedduring the milling process, because of the ordered microstructures in
the nano-sized chitosan granules weredestroyed after ball millingThe surface area of the nano-sized
chitosan was high, the particles tend to agglomerate since the ionic electrostatic could not prevent to
form the agglomeration. The ball milling treatment was an effective method to reduce the grain size
of chitosan, and functional groups will not automatically change during the milling process. |
