Direct Measurements of Critical Stresses and Cracking in Thin Films of Colloid Dispersions

by: Weining Man, William B Russel

Physical Review Letters, Vol. 100, No. 19. (2008)

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2008, colloids, drying, experiment

Abstract

Useful films can be formed by drying colloidal dispersions, but the negative capillary pressure generated often promotes cracks. Complex lateral flows during drying compromised previous measurements of the pressure required for cracking. Here we report data for the onset of cracking, and the additional cracks that appear at higher pressures, from high-pressure ultrafiltration experiments on homogeneously compressed films. A comparison of the data with expectations from theory confirms that cracking is controlled by elastic recovery, though an energy criterion only provides a lower bound. Our experiments also identify the role of flaws as nucleation sites that initiate cracks.

@article{citeulike:2811002, abstract = {Useful films can be formed by drying colloidal dispersions, but the negative capillary pressure generated often promotes cracks. Complex lateral flows during drying compromised previous measurements of the pressure required for cracking. Here we report data for the onset of cracking, and the additional cracks that appear at higher pressures, from high-pressure ultrafiltration experiments on homogeneously compressed films. A comparison of the data with expectations from theory confirms that cracking is controlled by elastic recovery, though an energy criterion only provides a lower bound. Our experiments also identify the role of flaws as nucleation sites that initiate cracks.}, author = {Man, Weining and Russel, William B. }, citeulike-article-id = {2811002}, doi = {http://dx.doi.org/10.1103/PhysRevLett.100.198302}, journal = {Physical Review Letters}, keywords = {2008, colloids, drying, experiment}, number = {19}, posted-at = {2008-05-18 19:20:44}, priority = {2}, publisher = {APS}, title = {Direct Measurements of Critical Stresses and Cracking in Thin Films of Colloid Dispersions}, url = {http://dx.doi.org/10.1103/PhysRevLett.100.198302}, volume = {100}, year = {2008} }

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TY - JOUR ID - citeulike:2811002 L3 - citeulike-article-id:2811002 TI - Direct Measurements of Critical Stresses and Cracking in Thin Films of Colloid Dispersions JF - Physical Review Letters VL - 100 IS - 19 PB - APS N2 - Useful films can be formed by drying colloidal dispersions, but the negative capillary pressure generated often promotes cracks. Complex lateral flows during drying compromised previous measurements of the pressure required for cracking. Here we report data for the onset of cracking, and the additional cracks that appear at higher pressures, from high-pressure ultrafiltration experiments on homogeneously compressed films. A comparison of the data with expectations from theory confirms that cracking is controlled by elastic recovery, though an energy criterion only provides a lower bound. Our experiments also identify the role of flaws as nucleation sites that initiate cracks. KW - 2008 KW - colloids KW - drying KW - experiment AU - Man, Weining AU - Russel, William PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevLett.100.198302 ER -

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