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Measurement of Moisture Migration Kinetics in Environmental Scanning Electron Microscopy

Published online by Cambridge University Press:  01 February 2011

Xiaohu Tang  and
Mario de Rooij
Xiaohu Tang
Affiliation:
x.tang@citg.tudelft.nl, Delft University of Technology, Microlab, Civil Engineering, Stevinweg 1, Delft, N/A, Netherlands
Mario de Rooij
Affiliation:
m.derooij@citg.tudelft.nl, Delft University of Technology, Microlab, Faculty of Civil Engineering and Geosciences, Delft, N/A, Netherlands
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Abstract

Volume change of cereal materials caused by moisture migration is studied by Environmental Scanning Electron Microscopy (ESEM) using videomicroscopy and stereoscopy in combination with image processing. It is shown that the in situ volume change can be monitored by following the change of projection area, assuming isotropic volume change. Also the volume change measured by stereoscopy matches well with the measurement of the projection area change by videomicroscopy (after normalization). It is concluded that volume changes more in a higher relative humidity (RH) region with more active kinetic behavior. The exact volume change in between two relative humidities can be obtained by interpolating the equilibrium volumes. All the sorption/desorption curves can be well described by the ‘parallel exponential kinetics’ model (PEK model), which described two independent, parallel processes.

Keywords

scanning electron microscopy (SEM)diffusionkinetics
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 982: Symposium KK – Electron Microscopy Across Hard and Soft Materials , 2006 , 0982-KK07-10
Copyright
Copyright © Materials Research Society 2007

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References

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