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Liquid infiltration into small scale structure is important process in the various manufacturing process. However, there are lack of experimental study, especially, the effect of pressure, even in the real process utilized the external pressure like droplet impact. In this study, we examined the liquid infiltration properties from the millimeter to micrometer scale into closed end tubes by applying pressure under two conditions, i.e. gradual and stepwise change, and discussed the gas dissolution effects. As a result, it is found that the amount of dissolved air by applying pressure is small, and it has little effect on the liquid infiltration in millimeter and sub-millimeter size of tubes. The main contribution to the liquid infiltration is gas compression. On the contrary, the micrometer scale of tubes with low aspect ratio, the liquid perfectly infiltrated into small tube by applying three times pressure owing to the gas dissolution. This results indicate that the gas dissolution is the main factor for liquid infiltration into nano-scale structure. Furthermore, we confirmed that the gas compression process well reproduced by the isothermal process.

Gas compression and dissolution in closed end tubes by applying pressure (Liquid infiltration characteristics into fine structure by pressure)