Distribution of Colloidal Particles during Solvent Evaporation
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This Demonstration examines the underlying processes that take place when a colloidal dispersion of uniform thickness consolidates as solvent is removed. The overlying gas phase is assumed to be unsaturated with vapor, thereby providing the driving force for solvent evaporation to take place. The evaporation rate can be expressed as , where is an appropriate mass transfer coefficient and and are the vapor pressures at the interface and in the bulk air, respectively. As the solvent evaporates (), the film thins and particles begin to consolidate at the gas–liquid interface . The distribution of particles at any instant in time is denoted by .
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Contributed by: Brian G. Higgins and Housam Binous (September 2016)
Open content licensed under CC BY-NC-SA
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Reference
[1] A. F. Routh and W. B. Zimmerman, "Distribution of Particles during Solvent Evaporation from Films," Chemical Engineering Science, 59(14), 2004 pp. 2961–2968. doi:10.1016/j.ces.2004.04.027.
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