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Depth-sensing indentation response of ordered silica foam

Published online by Cambridge University Press:  03 March 2011

Yvete Toivola ,
Andreas Stein  and
Robert F. Cook
Yvete Toivola
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
Andreas Stein
Affiliation:
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
Robert F. Cook
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract

Depth-sensing indentation was applied to three-dimensionally ordered silica foams of two different pore diameters—500 nm and 850 nm—formed by colloidal crystal templating. The contact responses of indentations with Berkovich and hemispherical indentation tips are presented over a load range of 1 mN to 100 mN. Scanning electron microscopy images of residual indentation impressions showed homogeneous deformation for small loads in which the peak displacement was shallow relative to the film–substrate interface. The characteristics of the load–displacement responses changed from periodic discontinuities, associated with cell wall fracture and pore collapse, to smooth and increased stiffness, as a result of densification due to the accumulation of material under the indentation tip and proximity (and contact) of the substrate. Load–displacement responses were translated into pressure–volume space, in which the average pressure during indentation is a measure of the crushing pressure of the cell walls.

Keywords

NanoindentationPorosityCellular

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Type
Articles
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Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 260 - 271
Copyright
Copyright © Materials Research Society 2004

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