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|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
MAT.P-404 |
| Subject |
Silica coated CeO2 particles with highly negative surface charge for UV screen |
| Authors |
HYUNJIN JUNG, Song-ho Byeon*
Department of Applied Chemistry, Kyung Hee University, Korea
|
| Abstract |
Ceria (CeO2) has attracted extensive research attention due to its potential applications in a variety of research fields such as three-way automotive catalysts, solid oxide fuel cells, and optical and biomedical materials. In addition, ceria presents unique capabilities in the absorption of UV light. As UV-screen is needed as part of safe-sun practices to reduce the effects of carcinogenic and photodamaging solar UV radiation, there has been increasing research interest in employing ceria in anti-UV coating materials. Furthermore, when used as a coating material, ceria also displays effective corrosion protection properties. However, constructing composite coating films using ceria and inorganic species with accurate control in the coating structure has remained a challenge. In particular, layer-by-layer (LbL) deposition of alternating positive and negative layers require high difference in surface charge between layers. In this work, CeO2 nanoparticles smaller than 20 nm in diameter were prepared for LbL deposition of UV-blocking multifunctional films. To enhance the negative surface charge, CeO2 nanoparticles were coated with an amorphous silica (a-SiO2), and their surface charge was highly improved to show the low point of zero charge (pHpzc < 3). Thus, silica coated CeO2 nanoparticles is very challenging as a negative UV-blocking layer material over a wide pH range, for LbL deposition with a positively charged inorganic species. These particles were well dispersed into water to form stable colloidal solutions that effectively screen UV. |
| E-mail |
jhj41100@naver.com |
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120th General Meeting of the KCS