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

T. Karppinen (Corresponding Author), Heikki Pajari, J. Haapalainen, I. Kassamakov, E. Haggström

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    2 Citations (Scopus)

    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 languageEnglish
    Article number174102
    JournalApplied Physics Letters
    Volume96
    Issue number17
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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