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Nano-structured TiO2 coatings were produced by suspension high velocity oxy fuel (SHVOF) thermal spraying using water-based suspensions containing 30wt% of submicron rutile powders (~180nm). By changing the flame heat powers from 40kW to 101kW, TiO2 coatings were obtained with distinctive microstructures, phases and photocatalytic behaviour. Spraying with low power (40kW) resulted in a more porous...