Abstract
We combined noninvasive ultrasonic and optical measurements to estimate the mechanical properties of forming colloidal films. Light reflection measurements determined the stage of drying and film structure. A concurrent ultrasound measurement quantified the film stiffness. The main finding was that compressing capillary forces induced a temporal peak in film stiffness when air began to enter the pores in the film. We believe that empirically observing such a stiffening event has not been reported before. This finding advances the understanding of the physics of consolidating suspensions.
Original language | English |
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Article number | 174102 |
Journal | Applied Physics Letters |
Volume | 96 |
Issue number | 17 |
DOIs | |
Publication status | Published - 2010 |
MoE publication type | A1 Journal article-refereed |