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SIZE MODIFICATION AND COATING OF TITANIUM DIOXIDE



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Abstract Title of Thesis SIZE MODIFICATION AND COATING OF TITANIUM DIOXIDE USING A PREMIXED HYDROGEN AIR FLAME Seungchan Lee Master of Science 2006 Thesis directed by Dr Sheryl H Ehrman Department of Chemical Engineering A study was conducted of the effect of flame processing on the size distribution of titania nanoparticles and a flame process was developed for producing TiO2 SiO2 coreshell particles from aqueous suspensions of TiO2 and SiO2 nanoparticles Both were performed using a premixed hydrogen air flame At the adiabatic flame temperature of 2400 K the number mean diameter of titania primary particle increased considerably from an initial value of 44 nm to 96 nm presumably by atomic diffusion and viscous flow coalescence Moreover the majority of product particles from this high flame temperature were smooth and spherical Based on the results of size modification experiments coating experiments were performed The dominant morphology observed in the product particles from coating experiments was silica coated titania The silica coating was very smooth and dense The total particle size and the shell volume of the product particles were in reasonable agreement with values predicted from the atomized droplet size distribution and the droplet concentration SIZE MODIFICATION AND COATING OF TITANIUM DIOXIDE USING A PREMIXED HYDROGEN AIR FLAME by Seungchan Lee Thesis submitted to the Faculty of the Graduate School of the University of Maryland College Park in partial fulfillment of the requirements for the degree of Master of Science 2006 Advisory Committee Professor Sheryl H Ehrman Chair Advisor Professor Michael R Zachariah Professor Mikhail Anisimov Professor Srinivasa R Raghavan Copyright by Seungchan Lee 2006 Acknowledgements I am deeply grateful for the meticulous guidance and true encouragement of my academic advisor Dr Sheryl H Ehrman I also would like to thank Dr Michael R Zachariah who is my co advisor He who has extensive knowledge in various areas and a



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