Analyzing the Compaction of High-Porosity Microscopic Agglomerates
Lars-Oliver Heim A C , Hans-Jürgen Butt A , Rainer Schräpler B and Jürgen Blum BA Max Planck Institute for Polymer Research, Polymerphysics, 55128 Mainz, Germany.
B Technical University of Braunschweig, Institute for Geophysics and Extraterrestrial Physics, 38106 Braunschweig, Germany.
C Corresponding author. Email: heim@mpip-mainz.mpg.de
Australian Journal of Chemistry 58(9) 671-673 https://doi.org/10.1071/CH05125
Submitted: 25 May 2005 Accepted: 14 July 2004 Published: 21 September 2005
Abstract
Highly porous agglomerates of silica microspheres (1.5 µm diameter) with a porosity of 0.85, formed by random ballistic hit-and-stick deposition, were deformed inside a scanning electron microscope using the cantilever of an atomic force microscope. The applied force and structural deformations with single particle resolution could be obtained simultaneously. First results indicate that whole blocks of many particles move collectively upon compression. Within these blocks the relative positions of the particles remain fixed. This results in a discontinuous force–compression curve.
Acknowledgments
Financial support from German Research Foundation (DFG) within the projects BU7011/19-4 and HE 4567/1-1 is gratefully acknowledged. The nanomanipulator was build under supervision of Michael Wilms.
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