| Title |
Hydrophobicity Behavior in the Crystalized CeO2-Na2O-SiO2 Glass |
| Authors |
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) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.4.237 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
glasses; crystal growth; wetting; scanning electron microscopy; SEM; CeO2 |
| 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) |