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Ice-templated silicon foams with aligned lamellar channels

Published online by Cambridge University Press:  08 November 2017

Fernando L. Reyes Tirado Open the ORCID record for Fernando L. Reyes Tirado [Opens in a new window] ,
Jiaxing Huang  and
David C. Dunand
Fernando L. Reyes Tirado
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Dr., Evanston, Illinois 60208, USA
Jiaxing Huang
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Dr., Evanston, Illinois 60208, USA
David C. Dunand*
Affiliation:
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Dr., Evanston, Illinois 60208, USA
*
Address all correspondence to David C. Dunand at dunand@northwestern.edu
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Abstract

An aqueous suspension of 5 vol% silicon (Si) nanoparticles was directionally solidified at substrate temperatures between −10 and −25 °C, resulting in colonies of aligned pure ice dendrites separated by interdendritic Si particles packed walls. Channels are created by sublimation of the dendrites, and the surrounding Si walls are densified by sintering. The resulting Si foams exhibit a 76 ± 2% macroporosity, with the width of the ice-templated channels and the Si walls decreasing with solidification temperature, from 106 to 60 µm and from 34 to 17 µm, respectively. Si walls show high surface roughness from inverse templating of short secondary ice dendrite arms.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 4 , December 2017 , pp. 928 - 932
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Copyright
Copyright © Materials Research Society 2017 

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