Production of Core-Shell Nanofibers by Coaxial Spinning

Electrospun nanofibers have shown remarkable properties as delivery systems for active substances contained in the polymeric fibers (e.g. antioxidants, antimicrobials). Recently, we demonstrated fabrication of nanoemulsion droplet-containing fibers with potential applications in food packaging. The objective of this study is to produce and characterize the structure and functionality of novel core-shell nanofibers composed of a polymer matrix core containing emulsion droplets surrounded by a polymeric shell. A double-nozzle was constructed and nanofibers spun using this custom-made coaxial spinarette. Eugenol-containing corn oil-in-water emulsions (d~85nm; 10vol%) are being mixed with polyvinylalcohol (PVA) and used as core material. PEO is dispersed in water and used as shell material. Spinning voltage (10-30kV) and core/shell polymer concentrations (2.5-10wt%) is being varied. Spun structures are being examined by Scanning and Transmission Electron Microscopy. Solutions properties (surface tension, conductivity and viscosity) are determined.