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

Research output: Contribution to journalArticleScientificpeer-review

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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stiffness
stiffening
optical measurement
compressing
drying
ultrasonics
mechanical properties
porosity
physics
air
estimates

Cite this

Karppinen, T. ; Pajari, Heikki ; Haapalainen, J. ; Kassamakov, I. ; Haggström, E. / Concurrent structural and mechanical characterization of forming colloidal film by ultrasound and light. In: Applied Physics Letters. 2010 ; Vol. 96, No. 17.
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Concurrent structural and mechanical characterization of forming colloidal film by ultrasound and light. / Karppinen, T. (Corresponding Author); Pajari, Heikki; Haapalainen, J.; Kassamakov, I.; Haggström, E.

In: Applied Physics Letters, Vol. 96, No. 17, 174102, 2010.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Concurrent structural and mechanical characterization of forming colloidal film by ultrasound and light

AU - Karppinen, T.

AU - Pajari, Heikki

AU - Haapalainen, J.

AU - Kassamakov, I.

AU - Haggström, E.

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

U2 - 10.1063/1.3387814

DO - 10.1063/1.3387814

M3 - Article

VL - 96

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

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