2.2.10. Thermogravimetric analysis (TGA)
Small amount of samples were placed in open pans and heated in Netzsch STA 409 PG (Netzsch, Selb, Germany), from 30 °C to 110 °C with isothermal segments at the beginning and ending of each measurement. The heating rate was set at 5 K/min. All samples were analyzed in duplicate.