| 초록 |
In this study, the pyrolytic carbon-silica membranes were modified by oxidation with an air at 400 ℃ as a function of oxidation time. The pyrolytic carbon-silica membranes were consisted of a carbon-rich phase and a silicon-rich phase, and were testified that they had a high oxygen permeabilities and oxygen/nitrogen selectivities. By the thermogravimetric analysis, the Si-polyimide heated in the presence of air showed the different thermal decomposition curves as compared with that heated in the presence of nitrogen. In addition, the oxidation of carbon membrane is effective in terms of increasing permeability, keeping selectivity. To reveal the structural characteristics, the carbon-silica membranes modified by oxidation were characterized by FT-IR spectroscopy, 29Si-NMR, X-ray diffraction, ESCA, FE-SEM, and TEM. |
