In this study, a "sprayable" fast-responding pressure-sensitive paint (PSP) has been systematically investigated to achieve the same time response as anodized-aluminum PSP (AA-PSP). A sprayable fast-responding PSP such as polymer/ceramic PSP (PC-PSP) has been eagerly studied because it is applicable to complex 3D models made of various materials while AA-PSP is applicable only to models made of aluminum or aluminum alloys. However, conventional PC-PSP is more than ten times slower than AA-PSP. In addition, PC-PSP has higher temperature sensitivity than standard polymer-based PSP. To solve these issues, Tris(4,7-diphenyl-l,10-phenanthroline) ruthenium(II) dichloride (Ru(dpp)_3)-based PC-PSP with the various combinations of polymers and particles were investigated by varying particle ratio in the binder layer, and their static and dynamic characteristics were evaluated. Obtained results revealed that Ru(dpp)_3)-based PC-PSP with RTV as a polymer and meso-structured silica as particle achieved a response time of 5 μs, which is comparable to that of AA-PSP and a high pressure sensitivity of 0.85 %/kPa. In addition, the novel PC-PSP showed a low temperature sensitivity of 1.0 %/°C while conventional PC-PSP exhibited a temperature sensitivity from 1.5 to 3.0 %/°C.
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