Formation of titanium hydroxide nanoparticles in supercritical carbon dioxide
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Titanium isopropoxide [TIP, C12H28O₄Ti] hydrolysis in supercritical carbon dioxide (SCCO₂) was performed using an aerosol solvent extraction system (ASES). The experiments were conducted at a pressure of 80-150 bar and a fixed temperature of 35oC, with a nozzle size diameter that ranged from 0.007 inch (0.18 mm) to 0.04 inch (1.02 mm). The TIP concentration in the liquid solution was varied from 0.1 to 2 wt.%. In situ formation of titanium hydroxide (Ti(OH)₄) nanoparticles was found during the ASES process. The effect of pressure, TIP concentration in the liquid solution, and nozzle size diameter on Ti(OH)₄ particle size was investigated. Based on scanning electron microscope and electrophoretic light scattering analyses for particle size, non-faceted titanium hydroxide particles were obtained in the range 132-356 nm.
Abstract
Titanium isopropoxide [TIP, C12H28O₄Ti] hydrolysis in supercritical carbon dioxide (SCCO₂) was performed using an aerosol solvent extraction system (ASES). The experiments were conducted at a pressure of 80-150 bar and a fixed temperature of 35oC, with a nozzle size diameter that ranged from 0.007 inch (0.18 mm) to 0.04 inch (1.02 mm). The TIP concentration in the liquid solution was varied from 0.1 to 2 wt.%. In situ formation of titanium hydroxide (Ti(OH)₄) nanoparticles was found during the ASES process. The effect of pressure, TIP concentration in the liquid solution, and nozzle size diameter on Ti(OH)₄ particle size was investigated. Based on scanning electron microscope and electrophoretic light scattering analyses for particle size, non-faceted titanium hydroxide particles were obtained in the range 132-356 nm.
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