Influence of Annealing on Photocatalytic Performance and Adhesion of Vacuum Cold-Sprayed Nanostructured TiO2 Coating

Abstract

Composite powder was prepared using primary nanoTiO 2 powder and polyethylene glycol (PEG). The nanoTiO 2 coating was deposited through vacuum cold spray using both the composite powder and the primary nanopowder. The influence of annealing on the coating adhesion and photocatalytic activity was investigated. The coating adhesion was evaluated through erosion test by water jet. The photocatalytic performance of the coatings was evaluated through photodegradation of phenol in water. Results showed that annealing of the coating at a temperature from 450 to 500°C yielded both higher activity and better adhesion. The adhesion of the coating deposited using the composite powder was better than that using the primary nanoTiO 2 powder. It was found that the TiO 2 coating, resulting from the composite powder, presented much higher activity than that deposited with the primary nanopowder. The better activity is attributed to the existence of large pores resulting from the stacking of composite powder, which benefits the reactantsÕ transportation through the porous coating.

Influence of pore structure on ion diffusion property in porous TiO2 coating and photovoltaic performance of dye-sensitized solar cells

“…The system consisted of vacuum pump, vacuum chamber, powder feeder, accelerating gas feeding unit, particle accelerating nozzle, two dimensional worktable and control unit [21][22][23]. TiO 2 particles were accelerated by He gas at a flow rate of 3 L/min.…”

MD Simulation on Collision Behavior Between Nano-Scale TiO2 Particles During Vacuum Cold Spraying

“…20 21 Although some results obtained by MD simulation exhibit fragmentations of ceramic particles by high velocity collision, 15 there is no experimental result about particle fragmentation for nano-scale ceramic particles during depositing agglomerates. [18][19][20][21] The results obtained by HRTEM examination confirm that no particle fragmentation is found when nano-scale particles deposited onto the substrate by vacuum cold spraying. 22 Those phenomena imply that the particle fragmentation may be not the main reason for nano-scale ceramic particles bonding and deposition.…”

Ceramic Nano-particle/Substrate Interface Bonding Formation Derived from Dynamic Mechanical Force at Room Temperature: HRTEM Examination

“…Therefore, several indirect methods are employed to investigate the coating/substrate interface bonding. For example, the mechanical property of the coating/substrate interface was explored by an ultrasonic cleaning method (Ref [25][26][27][28]. Although this approach can qualitatively indicate the coating/substrate interface adhesion, it is a macroscopic method without the details for the coating/substrate microstructure.…”