Abstract
Film formation from waterborne colloidal polymers is a complex phenomenon [1] that is becoming better understood as a result of recent efforts employing magnetic resonance profiling and imaging. The first reported use of MR microscopy to study drying (which is the first step of the film formation process) in such a system was in 2000 [2]. This work showed that in an alkyd emulsion cast on a substrate to form a convex drop, water flowed laterally to replace the water depleted at the edges. The data were consistent with a model that considered the lateral flow. MR microscopy has more recently been used in a systematic study of the factors that influence the drying of colloidal films. Theory based on the lubrication approximation [3] predicts how particle size, film thickness, and evaporation rate, among other factors, determine the time it takes for water to recede from the edges of a wet film. Analysis of MR images [4] supports the prediction that uniform lateral drying is favoured by larger particles, slower evaporation rates and lower film thickness.
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© 2002 Springer Science+Business Media Dordrecht
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Gorce, JP., Keddie, J.L., McDonald, P.J. (2002). MR Profiling of Drying in Alkyd Emulsions: Origins of Skin Formation. In: Fraissard, J., Lapina, O. (eds) Magnetic Resonance in Colloid and Interface Science. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0534-0_26
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DOI: https://doi.org/10.1007/978-94-010-0534-0_26
Publisher Name: Springer, Dordrecht
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