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Growth of zirconia particles by heterocoagulation, self-assembly, and convection-induced coagulation during forced hydrolysis in a refluxed reaction vessel

Published online by Cambridge University Press:  31 January 2011

Yu-Chen Chang  and
Kuei-Yuan Cheng
Yu-Chen Chang*
Affiliation:
Department of Chemical Engineering and Materials Science, Yuan Ze University, Chungli, Taiwan, Republic of China
Kuei-Yuan Cheng
Affiliation:
Department of Chemical Engineering and Materials Science, Yuan Ze University, Chungli, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

In literature related to forced hydrolysis of zirconia, heterocoagulation between large particulates and primary crystallites is generally accepted as the principal route of growth. Our dynamic light scattering (DLS) results revealed an S-shaped growth curve with the growth rate (slope) varying notably from one stage to the other, implying that other coagulation mechanisms may be present. Time-sequenced side-by-side electron microscopy and DLS analyses were conducted along the curves alongside with field emission scanning electron microscopy of full-grown particles. We find that particles growth follows a two-stage heterocoagulation process with primary crystallites and small particles produced from the first-stage serving as building blocks for the first and second stages, respectively. It interesting to note that growth during the second stage occurs by self-assembly and a hypothesis is proposed. Convection-induced coagulation leads to enhanced particle growth for a low precursor concentration but minimal growth for a higher one, both of which conform to the predictions of Melis et al. [AIChE J. 45, 1383 (1999)].

Keywords

HydrothermalOxideSelf-assembly
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1395 - 1404
Copyright
Copyright © Materials Research Society 2009

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