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4733 |
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Tuesday, May 10, 2016, Auditorium 2:20 PM Suspension Spraying I |
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Comparison of SFS, SPS and HVSFS for the production of photocatalytic titania coatings |
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Ben Robinson / TWI, UK Andy Tabecki/ TWI, UK Ivan Parkin/ UCL, UK Steve Shi*/ TWI, UK Shiladitya Paul/ TWI, UK Jawwad Darr/ UCL, UK Heidi de Villiers Lovelock/ TWI, UK |
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The photocatalytic capabilities of titanium dioxide are widely published. Reported applications of titania coatings include, air purification, water purification, energy production and self-cleaning. Suspension spray has been highlighted as a possible route for the deposition of highly active nanostructured titania coatings. Published work has demonstrated the capabilities of suspension plasma spray (SPS) and high velocity suspension flame spray (HVSFS), however, little work exists for suspension flame spray (SFS). Herein, these three suspension spray processes are compared as regards their capability to produce photocatalytic titania coatings and their potential for scale up. A range of coatings was produced for each process, manipulating coating parameters in order to vary phase composition and crystal size, to effect activity. Coatings produced were found to vary significantly between the processes with SFS highlighted as the most effective technique with regards scale-up and coating photoactivity. SFS coatings were found to be up to 5 times more active than analogous coating produced by chemical vapour deposition. |