Premium
Experimental and modeling analysis of diffusive release from single‐shell microcapsules
Author(s) -
Tavera Enrique Muñoz,
Kadali Shyam B.,
Bagaria Hitesh G.,
Liu Amy W.,
Wong Michael S.
Publication year - 2009
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11914
Subject(s) - diffusion , spheres , planar , shell (structure) , nanoparticle , materials science , kinetics , nanotechnology , microsphere , chemical engineering , chemistry , composite material , thermodynamics , physics , engineering , computer science , classical mechanics , computer graphics (images) , astronomy
There is much experimental and mathematical work that describes chemical transport from multilayered films of planar geometries. There is less so, however, for chemical transport from multilayered spheres, a common structure for controlled‐release materials. Based on the Sturm–Liouville approach of Ramkrishna and Amundson (1974), explicit analytical solutions for the concentration profiles and release kinetics from spherical capsules are presented. Fluorescent dye‐release studies using single‐shelled microspheres called nanoparticle‐assembled capsules were performed to validate the model for uniformly and nonuniformly sized capsules. The combined experiment‐modeling approach allows optical microscopy images and release measurements to be readily analyzed for estimating diffusion coefficients in capsule core and shell walls. © 2009 American Institute of Chemical Engineers AIChE J, 2009