Record Details

Role of capillary stresses in film formation

DSpace at IIT Bombay

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Field Value
 
Title Role of capillary stresses in film formation
 
Creator TIRUMKUDULU, MS
RUSSEL, WB
 
Subject organic coatings
latex
evaporation
 
Description Stresses generated during film formation were deduced from the deflection of a copper cantilever coated with a drying latex. Experiments with particles of varying radii and glass transition temperatures (T-g) focused on conditions for which capillary stresses normal to the film deform the particles to close the voids. Soft particles (low Tg) formed continuous films, but hard ones (high Tg) produced fascinating arrays of cracks. For both soft and rigid particles, the lateral stresses were tensile and scaled on the surface tension divided by the particle radius. Clearly, tensile stresses in the plane of the film responsible for cracking arise from the same capillary pressure that drives compression in the normal direction. Solving the model (Routh & Russel 1996, 1999) for lateral flow of the fluid dispersion prior to close packing and deformation of the solid beyond close packing yields volume fraction, film thickness, and stress profiles for comparison with observations for both film-forming and film-cracking cases.
 
Publisher AMER CHEMICAL SOC
 
Date 2011-07-14T18:49:04Z
2011-12-26T12:47:34Z
2011-12-27T05:36:38Z
2011-07-14T18:49:04Z
2011-12-26T12:47:34Z
2011-12-27T05:36:38Z
2004
 
Type Article
 
Identifier LANGMUIR, 20(7), 2947-2961
0743-7463
http://dx.doi.org/10.1021/la0356250
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4039
http://hdl.handle.net/10054/4039
 
Language en