Plastic-to-elastic transition in aggregated emulsion networks, studied with atomic force microscopy-confocal scanning laser microscopy microrheology

Langmuir : the ACS Journal of Surfaces and Colloids
D FilipJ Mellema

Abstract

In this paper, we demonstrate how the simultaneous application of atomic force microscopy (AFM) and confocal scanning laser microscopy (CSLM) can be used to characterize the (local) rheological properties of soft condensed matter at micrometer length scales. Measurement of AFM force curves as a function of the indentation amplitude and speed (magnitude and direction) can produce a "mechanical fingerprint" that contains information about material stiffness, hysteretic losses, and time scales for stress relaxation and/or network recovery. The simultaneous CSLM visualization of changes in the material's structure provides complementary information about how the material accommodates the indentation load. Since these experiments are done on areas of O(100 microm2) on materials having a surface of O(1 cm2), the measurements can be repeated on "fresh" material many times, contrary to traditional rheometers where the whole sample is loaded at once. As a particular example, we consider the case of a network of aggregated water-in-oil (W/O) emulsion droplets, in which the mechanical behavior changes drastically over time. Whereas the freshly prepared material shows a soft plastic behavior, after a time lapse of several weeks, the very s...Continue Reading

References

Apr 18, 2000·Journal of Colloid and Interface Science·E Dickinson
Jun 21, 2001·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M J Solomon, P Varadan
Dec 17, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·S RamakrishnanC F Zukoski
Jun 23, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·John P Pantina, Eric M Furst
Jun 30, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·V I UricanuJ Mellema
Aug 11, 2005·Physical Review Letters·S ManleyD A Weitz
Aug 11, 2005·Physical Review Letters·S ManleyD A Weitz
Jan 13, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·D FilipF Mugele

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Citations

Dec 2, 2011·Annual Review of Food Science and Technology·H S Melito, C R Daubert
Aug 23, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·V I Uricanu, M H G Duits

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