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Vol.53, No.4, 237 ~ 244, 2015
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| Title |
| Hydrophobicity Behavior in the Crystalized CeO2-Na2O-SiO2 Glass |
| 박현준 Hyun Joon Park , 김영석 Young Seok Kim , 김종환 Jong Hwan Kim , 김일구 Il Gu Kim , 정재엽 Jae Yeop Jung , 최수연 Su Yeon Choi , 류봉기 Bong Ki Ryu |
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| Abstract |
| Metal atoms in rare-earth oxides (REOs) have a different electronic structure, where the unfilled 4f orbitals are shielded from interactions with the surrounding environment by the full octet of electrons in the 5 s2 p6 outer shell. Thus, these metal atoms would have a lower tendency to exchange electrons and form a hydrogen bond with interfacial water molecules. In this study, we have prepared (10+x)CeO2-30Na2O- (60-x)SiO2 (in mol%, x=0,5,10) glass system and examined the characterization of hydrophobicity behavior of crystallized Na2O-SiO2 glass containing CeO2. In addition, we confirmed the change in the wettability of the glass surface due to change the heat treatment time for crystallization and a change amount of CeO2. It was found that the contact angles of crystallized specimens (CNS glasses) got higher by about 40~50° by the addition of CeO2 and 0~18 hr-heating, compared with the specimens without CeO2 and 0~8 hr heat treatment. In order to explain the hydrophobicity behavior of CNS glasses, surface structure through FT-IR ATR ranging from 3000 cm-1 to 4000 cm-1 was examined. The band characteristic of -OH bridges at about 3200 cm-1, 3400 cm-1 and 3600 cm-1 are attributed to the existence of hydrogen bond. At 3700 cm-1, as the intensity of peaks (0.006~0.036) gets higher, the contact angles increase by 51° to 73°. (Received July 1, 2013) |
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| Key Words |
| glasses, crystal growth, wetting, scanning electron microscopy, SEM, CeO2 |
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