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Cracking in drying latex films

DSpace at IIT Bombay

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Field Value
 
Title Cracking in drying latex films
 
Creator TIRUMKUDULU, MS
RUSSEL, WB
 
Subject granular ceramic films
thin-films
colloidal suspension
process model
patterns
stress
shrinkage
fracture
fronts
 
Description Thin films of latex dispersions containing particles of high glass transition temperature generally crack while drying under ambient conditions. Experiments with particles of varying radii focused on conditions for which capillary stresses normal to the film deform the particles elastically and generate tensile stresses in the plane of the film. Irrespective of the particle size, the drying film contained, simultaneously, domains consisting of a fluid dispersion, a fully dried packing of deformed spheres, and a close packed array saturated with water. Interestingly, films cast from dispersions containing 95-nm sized particles developed tensile stresses and ultimately became transparent even in the absence of water, indicating that van der Waals forces can deform the particles. Employing the stress-strain relation for a drying latex film along with the well-known Griffith's energy balance concept, we calculate the critical stress at cracking and the accompanying crack spacing, in general agreement with the observed values.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-13T21:34:26Z
2011-12-26T12:48:09Z
2011-12-27T05:45:25Z
2011-07-13T21:34:26Z
2011-12-26T12:48:09Z
2011-12-27T05:45:25Z
2005
 
Type Article
 
Identifier LANGMUIR, 21(11), 4938-4948
0743-7463
http://dx.doi.org/10.1021/la048298k
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3777
http://hdl.handle.net/10054/3777
 
Language en