Using Mg(OH) 2 coating on Nb 2 O 5 particles as a model system, the effects of core particle size and that of aging on coating in an aqueous environment were investigated. Specifically, two Nb 2 O 5 particle sizes were used in this study: micron‐sized commercial Nb 2 O 5 powder and 17‐nm synthesized Nb 2 O 5 particles. Coating of Mg(OH) 2 on Nb 2 O 5 was carried out by precipitating Mg(OH) 2 from magnesium nitrate in an aqueous Nb 2 O 5 suspension. The coating behavior of Mg(OH) 2 on Nb 2 O 5 was examined with optical microscopy, zeta‐potential measurement, and local chemical analysis by energy dispersion spectroscopy (EDS). The results showed that the size of Nb 2 O 5 plays an important role in the coating behavior of Mg(OH)2. Optical micrographs, zeta‐potential measurements, as well as local EDS analysis all indicated that coating Mg(OH) 2 on micron‐sized Nb 2 O 5 particles was easier than on nanometer‐sized Nb 2 O 5 particles. We attribute the difficulty in coating Mg(OH) 2 on nanometer‐sized Nb 2 O 5 to the enhanced dissolution of Mg(OH) 2 by the nanometer particle size as a result of the Kelvin effect. Aging improved the coating on micron‐sized Nb 2 O 5 but did not exhibit significant improvement in the Mg(OH) 2 coating on nanometer‐sized Nb 2 O 5 particles. It is likely that aging modified the coating behavior of Mg(OH) 2 on Nb 2 O 5 via a dissolution‐re‐precipitation mechanism.
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Luo et al. (2004) studied this question.
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