Nanostructured titania powders by hydrothermal processing and spray drying

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Titania (TiO2) nanostructured granules are crucial for various applications.
• Controlling the physical properties of TiO2 granules is essential for performance.
• Sol-gel and hydrothermal methods offer pathways for tailored nanomaterial synthesis.

Purpose of the Study:

• To investigate the impact of hydrothermal processing parameters on titania granule properties.
• To synthesize spherical, micron-size nanostructured titania granules.
• To characterize the structural and thermal properties of the synthesized granules.

Main Methods:

• Preparation of titania precipitates using sol-gel method with organometallic precursors.
• Hydrothermal crystallization of the precipitates.
• Spray drying to form spherical granules.
• Characterization using X-ray diffraction, nitrogen adsorption, and microscopy.

Main Results:

• Increased hydrothermal processing time led to larger anatase crystallite size and enhanced thermal stability.
• Higher hydrothermal processing temperatures reduced crystallite growth and elevated the anatase-to-rutile transformation temperature.
• Spherical, micron-size nanostructured titania granules were successfully produced.

Conclusions:

• Hydrothermal processing time and temperature significantly influence titania granule properties.
• Optimized hydrothermal conditions can improve thermal stability and control crystallite size.
• The study provides insights into tailoring titania nanomaterials for specific applications.