Synthesis and characterization of surface-modified ceria oxide nanoparticles using supercritical methanol in a continuous system

Title
Synthesis and characterization of surface-modified ceria oxide nanoparticles using supercritical methanol in a continuous system
Authors
밤방김재훈김재덕이윤우
Keywords
ceria oxide; nano particle; supercritical; methanol
Issue Date
2009-04
Publisher
한국화학공학회 2009봄학술대회
Citation
, 314
Abstract
Surface-modified ceria oxide (Ce02) nanoparticles were synthesized rapidly and continuously in supercritical methanol at 400 oC, 30MPA and a residence time of ~40s by using a hlow type reactor system. Oleic acid and decanoic acid were used to modify surface of Ce02. TEM showed that the usage of supercritical methanol and the addition of the surface modifiers changed drastically the shape and size of the nanoparticles. When 0.3 M of the surface modifiers were used, primary particles with diameter of 2-3nm were loosely aggregated and formed secondary particles with size of 30-50 nm. WAXD analysis revealed that the surface-modified nanoparticles retained Ce02 crystalline structure. FT-IR analysis indicated that reagents comprised of aliphatic, carbovylate and hydroxyl group chemically bounded onto the surface of Ce02 nanoparticles. The surface modified CeO2 nanoparticles showed a very high surface area (190 m2/g) compared with unmodified CeO2 particles synthesized with supercritical water (8.5m2/g). Dispersion test showed that the addition of organic mokifier into the reaction system significantly affected the dispersion stability of nanoparticles.
URI
http://pubs.kist.re.kr/handle/201004/41677
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KIST Publication > Conference Paper
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