No abstract

No abstract

No abstract

No abstract

To prevent SiO 2 nanoparticle (SNP)s from aggregation, surface modification of them was performed using bio-safe citric acid (CA) and L(+)-ascorbic acid (vit C) for the first time.After that, NC films of well dispersed Modified SiO 2 (Mod-SiO 2 ) in the poly(vinyl alcohol) (PVA) matrix (PVA/Mod-SiO 2 ) were prepared using solution casting method.The prepared NC films loaded with different mass fractions (4, 8 and 12 wt%) of Mod-SiO 2 were analyzed by several techniques. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) showed that Mod-SiO 2 with size ranging between 23-27 nm is dispersed in the PVA matrix . With Thermogravimetric analysis (TGA) the amount of attached modifiers was estimated 13 wt%. TGA results also indicated that the incorporation of Mod-SiO 2 in the PVA matrix can improve its thermal stability.