Micro/mesoporous quasi-zero-dimensional AlOOH and Al₂O₃ nanoparticles

Abstract

The operational condition in hydrothermal synthesis method is critically determining the morphology and the structure of the synthesized powders. Quasi-zero-dimensional boehmite (γ-AlOOH) and γ-alumina (γ-Al₂O₃) nanocrystallines with porous structure have been synthesized by applying strong bases as precipitant in simple hydrothermal synthesis method. The samples were well characterized by using XRD, FTIR, SEM, TEM, TGA, and N₂ adsorption/desorption techniques. The γ-AlOOH nanoparticles were successfully converted into γ-Al₂O₃ with the same morphology via thermal post-treatment. No impurities were detected for the synthesized γ-AlOOH and γ-Al₂O₃ nanoparticles using XRD analysis and both presented narrowly distributed particle size with high crystallinity and micro/mesoporous structure. Effect of precipitant showed that potassium hydroxide creates high porosity and high specific surface area for nanoparticles of AlOOH. The effect of different synthesis methods and their operational condition on the morphology of AlOOH and Al₂O₃ was comprehensively investigated.

Keywords:

• Quasi-Zero-Dimensional
• Al₂O₃
• AlOOH
• micro/mesoporous

Acknowledgements

The authors gratefully acknowledge the Islamic Azad University, Kermanshah Branch for their supports.