Concurrent structural and mechanical characterization of forming colloidal film by ultrasound and light

Karppinen, Timo; Pajari, Heikki; Haapalainen, Jonne; Kassamakov, Ivan; Hæggström, Edward
April 2010
Applied Physics Letters;4/26/2010, Vol. 96 Issue 17, p174102
Academic Journal
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.


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