| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 95 === A novel synthetic approach was successfully demonstrated as the efficient fabrication for Janus nanoparticles. Instead of using two-dimensional plane surfaces, one-dimensional polymer fibers provided even more interfacial area to confine or to encapsulate zero-dimensional colloids. A polymer-based electrospinning technique capable of making polymeric fiber mats was employed to produce substrates with high surface-to-volume ratio. A polymer blending system, the mixture of poly(methyl methacrylate) (PMMA) and poly(4-vinyl pyridine) (P4VP), was adapted to generate the electrospun fibers with desired surface properties.
Silica colloids were assembled onto the electrospun polymer substrates due to the interaction between silanol groups from silica colloid surface and pyridine groups from P4VP. The thermally-induced embedment under the precise temperature manipulation was conducted to protect one of the two hemispheres. Exposed hemispheric surface modification of embedded silica colloids was then carried out by the silanization reaction with 3-aminopropyl trimethoxysilane via a chemical vapor deposition. Uniform functionalization on Janus particles were further confirmed by the attachment of gold nanoparticles onto the amino-enriched hemispheric surfaces. Fabrication and characterization of Janus particles were discussed.
In this research, not only the fabrication of Janus particles from template-assisted method was demonstrated, but also the phase separation of fibers from emulsion electrospinning was discussed. Successful mass production of uniform Janus particles in this research work opens the great potentials of using these unique materials in the dual-functional devices, supra-structure materials, electronic papers, anisotropic image probes, and more.
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