The hybrid polymer materials of nano-zinc oxide were synthesized via miniemulsion polymerization technique. Zinc oxide nanoparticles were encapsulated by polystyrene to introduce multi-function to the hybrid nano-zinc oxide. The contents of zinc oxide particles in the hybrid nano-zinc oxide were various from 1wt% to 40wt%. The particles sizes of hybrid nano-zinc oxide were determined by using dynamic light scattering. It was showed that the particle size of the hybrid nano-zinc oxide was in the range of 124-205nm. Scanning electron microscopy was employed to determine the topography and morphology of hybrid nano-zinc oxide. The crystal structure of hybrid nano-zinc oxide were explored by X-ray diffraction spectroscopy.
We report a new supramolecular method for the synthesis of well-defined pristine C 60/polymer colloid nanocomposites in water. The colloids include polymer micelles and emulsion particles. To a polymer colloid solution in water or alcohol, we introduced C 60 solution in a solvent that is miscible with water or alcohol. After the two solutions mixed, polymer colloids and C 60 spontaneously assembled into stable colloidal nanocomposites. After a dialysis process, a nanocomposite dispersion in pure water was obtained. As characterized by DLS and (Cryo-)TEM, the nanocomposites have a core-shell structure with C 60 aggregated on the surface of emulsion particles or micellar cores. The resulting nanocomposites have many potential applications such as biomedicals and photovoltaics.
Well-defined, water-soluble C(60)/micelle hierarchical colloids with varied amounts of C(60) sitting on the surface of micellar cores were prepared via the self-assembly of PS-b-PDMA block copolymer micelles and C(60). The composites can generate a significant amount of reactive oxygen upon irradiation with red light. Cell studies showed that the colloids were either strongly associated with, or internalized by, the cells after 2 h incubation, but did not show obvious toxicity in the dark. In contrast, efficient cell killing was observed when the colloid-incubated cells were exposed to red light. This indicates that the supramolecular colloids are promising as photosensitizers for photodynamic cancer therapy.
Poly(vinyl alcohol) nanowebs were prepared by electrospoinning technique. The electrospinning technique produced nanometer scale of polymer fibres. This technique used the electrostatic force draw the polymer solution from the needle tip and deposited on substrate to from nanowebs. The PVA nanowebs were prepared with various surfactant types (anionic, cationic and nonionic surfactant). The cetyltrimethylammonium bromide, polyethylene glycol sorbitanmonolaurate, polyoxyethylenesorbitanmonolaurate, sodium lauryl sulfate were employed as surfactants. The morphology of PVA nanowebs were investigated using scanning electron microscope (SEM). The SEM micrograph shows that PVA nanowebs with all surfactants were successfully prepared with no beat. Thermal properties were measured by using differential scanning calorimetry (DSC). The results show that the %crystalline of PVA with SLS surfactant was slightly decreased. The mechanical property of nanowebs were measured using universal testing machine. The structure of nanowebs were analyzed by x-ray diffraction technique.
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