A platinum-based fast-response pressure-sensitive paint containing hydrophobic titanium dioxide

A single-component pressure-sensitive paint (PC-PSP) based on a platinum complex was developed. This sprayable, fast-response PSP exhibited a short-response time, high robustness, and high-pressure sensitivity and was subsequently applied to the time-resolved measurement of pressure distribution. The binder of the proposed PC-PSP was prepared by mixing poly(isobutyl methacrylate) with titanium dioxide (TiO2) particles in various proportions. The effects of a particle mass content on the properties of the PSP, including response time, pressure sensitivity, and luminescent intensity, were investigated. The effects of applying hydrophilic and hydrophobic surface treatments to the TiO2 particles on the structure and mechanical robustness of the binder layer were also studied. A PC-PSP having practical applications was produced using hydrophobic TiO2. This material is straightforward to apply and shows strong adhesion to the substrate together with a fast response. Hydrophobic TiO2 particles, which had a polarity similar to that of the toluene used to make the binder, provided better adhesion because they could maintain a dense binder structure even when the particle mass content was increased to 97 wt%. A particle mass content of 93 wt% gave a high performance from the point of view of response time and roughness.