In:
Journal of the American Ceramic Society, Wiley, Vol. 94, No. 9 ( 2011-09), p. 2742-2745
Abstract:
We propose a simple and environmentally friendly method to prepare uniform‐sized spherical ceramic foams ( SCF s) with excellent pore properties by combining a drop‐in‐oil method with agar gelation. In addition, the change in size distribution and uniformity (characterized as coefficient of variation ( C.V. )) and the corresponding pore‐related properties for the SCF s were systematically investigated as functions of agar concentration (i.e., 0.50–1.50 wt% with respect to dry alumina). The results showed that uniform‐sized SCF s were successfully fabricated regardless of agar concentration, that pore‐related properties were gradually improved by increasing the agar content, and that the most uniform‐sized SCF s were obtained when the agar concentration was 1.00 wt%. The extent of the improvement in size uniformity was evaluated by comparing the C.V. value for the drop‐in‐oil method with that for the pseudo‐double‐emulsion ( PDE ) method, which is an alternative method to fabricate SCF s. The C.V. values for the SCF s prepared by the drop‐in‐oil and the PDE method were determined to be 7% and 31%, respectively. The results clearly indicate that the size uniformity of the SCF s has been much improved for the drop‐in‐oil method as compared to the PDE method.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.2011.94.issue-9
DOI:
10.1111/j.1551-2916.2011.04681.x
Language:
English
Publisher:
Wiley
Publication Date:
2011
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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