Hybrid hollow nanospheres of chitosan-silica templated by chitosan-poly(acrylic acid) nanoparticles are fabricated in a complete aqueous system, which provide a pH-sensitive switch in physiological and sub-cell environments for the release of loaded drug.

In this study, we have synthesized highly photoluminescent TiO2/poly (phenylene vinylene) (PPV) hybrid nanoparticle‐polymer fibers by electrospinning a PPV precursor added to a TiO2 sol‐gel solution. The diameters of the hybrid fibers ranged from 100–300 nm and the average size of TiO2 nanoparticles within the fibers was 10–60 nm. FT‐IR analysis indicated that a new band around 1 632 cm−1 assigned to the TiOC vibration appeared, which resulted in the stronger luminance of the fluorescence of the TiO2/PPV hybrid fibers compared to free standing PPV nanofibers.

Highly fluorescent nanofibers were prepared by electrospinning the solutions containing poly(p-phenylene vinylene) (PPV) precursor and poly(vinyl pyrrolidone), followed by thermal conversion. Different morphologies from uniform helical to ultrathin straight ones were controllably prepared by adjusting the amount of PPV precursor in electrospinning solutions. The experimental data suggest that the viscosity and conductivity of electrospinning solution and the operating voltage are the main factors that affect the formation of the helical structures. These different nanofiber morphologies may be advantageous depending on the applications.

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