NDLI: Encapsulation and controlled release from core–shell nanoparticles fabricated by plasma polymerization

Content Provider	Springer Nature Link
Author	Shahravan, Anaram Matsoukas, Themis
Copyright Year	2012
Abstract	Core–shell nanostructures have been synthesized by plasma deposition in radio-frequency plasma reactor. Silica and KCl nanoparticles were encapsulated by deposition of isopropanol-based films of amorphous hydrogenated carbon. Through control of the deposition time, under constant deposition rate of 1 nm/min, particles are encapsulated in a layer of plasma polymer with thickness between 15 and 100 nm. Films are robust, chemically inert, thermally stable up to 250°C. The permeability of the shells is determined by depositing films of various thickness onto KCl nanoparticles and monitoring the dissolution of the core in aqueous solution. The dissolution profile is characterized by an initial rapid release, followed by a slow release that lasts up to 30 days for the thickest films. The profile is analyzed by Fickian diffusion through a spherical matrix. We find that this model captures very accurately the entire release profile except for the first 12 hours during which, the dissolution rate is higher than that predicted by the model. The overall diffusion coefficient for the dissolution of KCl is 3 × 10$^{−21}$ m$^{2}$/s.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	1
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-11
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Core–shell morphology Nano-hollow particle Encapsulation Controlled release Synthesis Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices Characterization and Evaluation of Materials Inorganic Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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