Surface-modified cerium oxide nanoparticles synthesized continuously in supercritical methanol: Study of dispersion stability in ethylene glycol medium
- Surface-modified cerium oxide nanoparticles synthesized continuously in supercritical methanol: Study of dispersion stability in ethylene glycol medium
- Bambang Veriansyah; 전명석; 김재훈
- Nanoparticle; Dispersion stability; DLVO interaction; Electrostatic repulsion; van der Waals attraction; Hydrophobic/hydrophilic interaction
- Issue Date
- Chemical engineering journal
- VOL 168, NO 3, 1346-1351
- 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.
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