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Defect and microstructural evolution during drying of soapnut-based alumina foams

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Title Defect and microstructural evolution during drying of soapnut-based alumina foams
 
Creator PRADHAN, M
BHARGAVA, P
 
Subject reticulated porous ceramics
phosphate ceramics
tailored porosity
aqueous foams
silicon
wood
infiltration
fabrication
carbide
suspensions
al2o3
soapnut
foam stability
drying
defects
cell size gradient
cell connectivity
 
Description The present study demonstrates the use of soapnut, a naturally occurring surfactant for producing alumina ceramic foams. A range of slurry compositions with soapnut amounts ranging from 2 to 20 wt% in water, alumina loading of 35-55 vol% were studied. Though all slurry compositions foamed when subjected to mechanical agitation the formation of green ceramic foams free of macroscopic defects was found to be strongly dependent on conditions during drying of foamed slurries. Addition of guar gum to the slurries was shown to enhance foam stability and thus produce defect-free foams from compositions that otherwise either collapsed or resulted in other macroscopic defects during drying. Drying conditions also had a strong effect on microstructural parameters such as cell size and cell connectivity. Soapnut-based foams appear to have a greater connectivity between cells than foams produced by other comparable processes. (c) 2008
 
Publisher ELSEVIER SCI LTD
 
Date 2011-07-21T23:22:33Z
2011-12-26T12:52:12Z
2011-12-27T05:39:16Z
2011-07-21T23:22:33Z
2011-12-26T12:52:12Z
2011-12-27T05:39:16Z
2008
 
Type Article
 
Identifier JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 28(16), 3049-3057
0955-2219
http://dx.doi.org/10.1016/j.jeurceramsoc.2008.05.025
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6031
http://hdl.handle.net/10054/6031
 
Language en