title: Ostwald ripening of beta-carotene nanoparticles.
abstract: Ostwald ripening, the interfacial-energy-driven dissolution and reprecipitation of solutes, becomes an increasingly significant problem for nanoparticle formulations. We present the first quantitative study of Ostwald ripening for nanoparticle dispersions. The Lifshitz-Slyozov-Wagner (LSW) theory of particle growth driven by diffusion is applied to study beta-carotene nanoparticles with sizes of O(100 nm) formed by our block-copolymer protected Flash Nanoprecipitation process. A numerical implementation of the LSW theory that accounts for the original particle size distribution is presented. The predicted particle sizes from the numerical simulation are compared with the experimental results measured by dynamical light scattering. The results show quantitative agreement with no adjustable parameters. The addition of antisolvent results in the reduction of the ripening rate by dramatically decreasing bulk solubility.
authors.affiliation: Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Kendra
authors.initials: K
authors.lastname: Kathan
authors.forename: Walid
authors.initials: W
authors.lastname: Saad
authors.forename: Robert K
authors.initials: RK
authors.lastname: Prud'homme
mesh_terms: D011232:Chemical Precipitation; D008027:Light; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D012542:Scattering, Radiation; D012995:Solubility; D019207:beta Carotene / Q000737:chemistry*
chemical_list: D011137:Polystyrenes; D019207:beta Carotene; D011092:Polyethylene Glycols