Article ID Journal Published Year Pages File Type
155539 Chemical Engineering Science 2013 5 Pages PDF
Abstract

The synthesis and in-situ organic surface modification of spinel cobalt aluminate nanoparticles were carried out under subcritical reducing hydrothermal conditions (250 °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.

► CoAl2O4 was obtained under subcritical reducing conditions using a flow reactor. ► Preventing the oxidation of Co2+ enabled the formation of a blue pigment. ► In-situ surface modification changed the surface of the nanoparticles into a hydrophobic surface. ► Nanoparticles modified by hexanoic acid were well dispersed in hexane. ► The particle size decreased to 10 nm.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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