Surface-modified cerium oxide nanoparticles synthesized continuously in supercritical methanol: Study of dispersion stability in ethylene glycol medium

Title
Surface-modified cerium oxide nanoparticles synthesized continuously in supercritical methanol: Study of dispersion stability in ethylene glycol medium
Authors
Bambang Veriansyah전명석김재훈
Keywords
Nanoparticle; Dispersion stability; DLVO interaction; Electrostatic repulsion; van der Waals attraction; Hydrophobic/hydrophilic interaction
Issue Date
2011-04
Publisher
Chemical engineering journal
Citation
VOL 168, NO 3, 1346-1351
Abstract
Dispersion stability of surface-modified cerium oxide (CeO2) nanoparticles in ethylene glycol is examined and the experimental stability results are compared with an extended DLVO model consisting of electrostatic, van der Waals, and hydrophobic/hydrophilic interactions. Unmodified, decanoic acid-modified and oleic acid-modifiedCeO2 nanoparticles are synthesized continuously in supercritical methanol (scMeOH). The surface charge of the surface-modified CeO2 particles changes from positive to negative with an increment in the medium pH while the surface charge of the unmodified CeO2 particle does not change with varying pH. Long-term dispersion stability test (up to 100 days) shows that the oleic acid-modified nanoparticle with a concentration of 0.3Mretains most stable dispersion in ethylene glycol. The unmodified and decanoic acid-modified nanoparticles with a concentration of 0.03M precipitate within 7–15 days. In contrast, initial short-term stability evolution reveals different stability behavior compared to the long-term stability. The unmodified and the decanoic acid-modified nanoparticles with a concentration of 0.03M were less attractive than the oleic acid-modified nanoparticle with 0.3 M. The experimental short-term stability data is in good agreement with the computational results of energy profiles for the CeO2 nanoparticle suspension.
URI
http://pubs.kist.re.kr/handle/201004/39608
ISSN
1385-8947
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KIST Publication > Article
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