| 초록 |
The concentration of volatile organic compounds (VOCs) that are off-gases from instruments as well as from the human metabolism are significantly considered when designing of spacecraft and spacesuit for long period mission such as planet exploration because they derive diseases such as central nervous disorder, irritation of mucosa and arrhythmia. As present VOCs control system that are composed a charcoal bed for adsorption, a sorbent bed(2kg of LiOH/day-person, LiOH affects irritation of eyes) and a catalytic oxidizer(operated at 400°C) is heavy and complex, thus, development of compact and efficient VOCs control system is important. As a results, we suggested that red TiO2 nanotubes enable to reduce weight of present VOCs control system and hazardous LiOH replacement. In this study, TiO2 nanotubes were used for decomposition of VOCs that confined at inside and outside tube walls to protect astronauts against VOCs. Blue/Red TiO2 nanotubes were prepared by alkaline based hydrothermal reaction in convection oven and subsequently it was annealed under hydrogen gas. VOCs for decomposition test were considered based on spacecraft maximum allowable concentrations table from NASA. Their efficiency of VOCs decomposition in both TiO2 nanoube-coated optical fibers and transparent glass tubes will be investigated and evaluated in the trace contaminant system of spacecrafts. Acknowledgement This research was supported by space Core Technology Development Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education Science and Technology(MEST) (2017M1A3A3A02016666) |
