Influence of NH₄OH medium concentration on the gel phase formation and characterization after heated

The gel particles have been made at various NH₄OH medium concentration in the gelation process. The variables of NH₄OH concentration were 2, 4, 6, 8 and 10 N. The gels after dry were heated at 100, 400, 600 and 800°C during 3 hours. The gel characterizations were examined using an optic microscope and scanning electron microscope to know the shape and microstructure of the surface. The experiment result shown that the gel phase was formed using NH₄OH medium with concentration ≥ 8 N, and after be heated at 800°C it was unbreakable. It was also shown that the gel shape and surface morphology was spherical, homogeneous and un breakable after heated gel at 100 until 800°C. (author)