期刊
CHEMICAL ENGINEERING JOURNAL
卷 168, 期 3, 页码 1346-1351出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2010.12.055
关键词
Nanoparticle; Dispersion stability; DLVO interaction; Electrostatic repulsion; van der Waals attraction; Hydrophobic/hydrophilic interaction
资金
- Ministry of Education, Science and Technology [2010-0019131]
- Korean Government (MEST) [NRF-2009-C1A AA001-2009-0092935]
- National Research Foundation of Korea [2009-0092937, 2008-2002344] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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-modified CeO2 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 0.3 M retains most stable dispersion in ethylene glycol. The unmodified and decanoic acid-modified nanoparticles with a concentration of 0.03 M 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 0.03 M 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. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据