TGA sample was prepared by removing an aliquot amount (1 mL) of the
aqueous dispersion using a pipette to a clean scintillation vial and
drying it under high vacuum at room temperature. When the sample was
completely dry, the residue was dissolved in minimum amount of CHCl3 and the solution was carefully transferred into the TGA heating
pan, at which time the solution was completely evaporated in air before
the TGA experiment was started. The TGA experiment was performed on
a Shimadzu TGA-50 analyzer. The weight loss was analyzed by heating
the sample from room temperature to 500 °C at the rate of 5 °C/min.