Coaxial electrospinning with organic solvent for controlling the size of self-assembled nanoparticlesElectronic supplementary information (ESI) available: Experimental procedures, characterization methods, and Fig. S1-S6. See DOI: 10.1039/c0cc03521a

We show that coaxial electrospinning using organic solvent as the sheath fluid is a viable way to produce tailor-made nanofibers composed of polyvinylpyrrolidine, tristearic and naproxen. Self-assembled hybrid nanoparticles are generated from the composite nanofibers under aqueous conditions and particle size has a linear relationship with fiber diameter. Sizes of self-assembled nanoparticles can be controlled by nanofibers produced by coaxial electrospinning process with pure solvents as sheath fluid.