The Effect of Acid Concentration on Nano α-Alumina Particle Size in Sol-Gel Method

Nanocrystalline alumina was synthesized by a simple sol–gel method using aluminum nitrate in acetic acid mixed aqueous solutions. The alumina gel was then successfully transformed to α-Al2O3 through subsequent low temperature heat treatment. The obtained gel and powders were characterized by X-ray diffractometry (XRD), scanning electron microscopy and scanning probe microscopy. The XRD analysis showed that the alumina was completely transformed to mono-phase, nanocrystalline α-Al2O3 (10.5nm) at 1150°C. The concentration of acetic acid affects the amount of produced gel and the gelation time.

Keywords:

Sol-Gel , Alumina Nanocrystalls , α-Al2O3 , Acetic Acid