Journal
CHEMICAL ENGINEERING SCIENCE
Volume 85, Issue -, Pages 50-54Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2012.01.061
Keywords
Cobalt aluminate; Surface modification; Mixing; Dispersion; Particle; Materials processing
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Funding
- Grants-in-Aid for Scientific Research [20226015] Funding Source: KAKEN
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The synthesis and in-situ organic surface modification of spinel cobalt aluminate nanoparticles were carried out under subcritical reducing hydrothermal conditions (250 degrees C, 30 MPa). Single nanoparticles of cobalt aluminate were obtained using a continuous flow-type reactor; in contrast, Co1-xAlx layered double hydroxide (Co-Al-LDHs) became the main product when a batch-type reactor was used. The addition of a surface modifier, hexanoic acid, to the flow-type reaction system changed the hydrophilic surface of the nanoparticles to a hydrophobic surface. Cobalt aluminate nanoparticles modified with hexanoic acid were well dispersed in hexane. The in-situ surface modification during the synthesis of the nanoparticles reduced the particle size from 15 nm to 10 nm. (C) 2012 Elsevier B. V. All rights reserved.
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