Effect of acid leaching time on pore diameter and volume of porous hollow glass microspheres

Porous hollow glass microspheres have attracted attention in many applications because of their wall structure and storage ability. In this study, The effect of acid leaching time on porosity properties of porous microspheres was investigated. Hollow glass microspheres with wall thickness of 0.5–2 µm were fabricated from borosilicate glass frits in oxy-acetylene flame. Microspheres were heat treated and acid leached to produce porous hollow glass microspheres. Thermal analysis indicated appropriate temperature for the heat treatment and creation of adequate phase separation. According to the results, the various acid leaching times lead to different range of pore volume and sizes.