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《高分子科学(英文版)》 2016-09
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Influence of Mixed Common Solvent on the Co-assembled Morphology of PS-b-PEO and CdS Quantum Dots

Wei Liu;Hai-shan Zhang;Xiang-ling Ji;State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Department of Colorectal and Anal Surgery, China-Japan Union Hospital, Jilin University;  
The hybrid structures of polystyrene-b-poly(ethylene oxide)(PS-b-PEO) block copolymer and inorganic nanoparticles with good stability and biocompatibility have potential applications in drug delivery and bioimaging. Spherical co-assemblies of PS120-b-PEO318 and oleylamine-capped Cd S quantum dots(QDs) are produced successfully in this work by adding water to a mixed common solvent, such as N,N-dimethylmethanamide(DMF)/chloroform, DMF/tetrahydrofuran(THF), or DMF/toluene. The energy dispersive X-ray(EDX) spectrum indicates that QDs are located at the interface between the core and shell of the spherical co-assemblies. The co-assembly process during water addition is traced by transmission electron microscopy(TEM) and turbidity measurement. Spherical co-assemblies are formed through budding from bilayers of the block copolymer and QDs. The morphology of the co-assemblies is related to the miscibility of the QD-dispersing solvents with water and the morphology changes from a spherical to a vesicle-like structure with DMF/toluene. Increasing THF content in the mixed solvent causes morphological transitions from spherical co-assemblies to multi-branched cylinders and micelles where QDs are located in the central core. Increasing chloroform content yields vesicle-like structures with protruding rods on the surface. The mechanism of the morphological transitions is also discussed in detail.
【Fund】: financially supported by the National Natural Science Foundation of China(No.21274145)
【CateGory Index】: TB332
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