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Preparation of Janus Nanoparticles by Using Amphiphilic Block Copolymer as Templates

Author: FuXiaoNing
Tutor: LiXue
School: Jinan University
Course: Polymer Chemistry and Physics
Keywords: Nanoparticles Amphiphilic block copolymer Self-assembly Janus particles
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 178
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Abstract


In this thesis, template preparation of various asymmetric nanoparticles self-assembled block copolymer and inorganic components, especially metal - metal oxide Janus nanoparticles. Optional polyvinyl pyridine-b-poly (ethylene oxide) (PVP-b-PEO), polystyrene-b-poly (ethylene oxide) (PS-b-PEO), polystyrene-b-polyvinylpyridine (PS-B -PVP) the HAuCl 4 , the TiO 2 , the FeCl 3 and other inorganic component self-assembly as a model to study the block copolymer Self-assembly is formed from a variety of composite micelles with an inorganic component structure and process of conducting the shape and dimensional change, discussed the mechanism for the formation of asymmetric Janus particles, prepared by asymmetric metal - metal oxide nano-particles or order, and catalytic properties of asymmetric metal - metal oxide nanoparticles. (1) Au-TiO 2 eccentric core-shell nanoparticles preparation method. The use of block copolymer PVP-b-PEO as a template, the formation of functional groups of PVP and gold chloride acid (the HAuCl 4 ) the interaction to PVP / HAuCl 4 Nuclear, PEO-shell composite micelles. After UV irradiation, the HAuCl 4 in situ reduction of single qualitative Au. The sol-gel method, TiO 2 selective adhesion on the PEO shell, forming a core-shell composite nanoparticles. The core-shell composite nanoparticles spin-coated to form a thin film irradiated with UV light to remove the block copolymer can be prepared eccentric asymmetric Au-TiO is 2 core-shell nanoparticles. This particular Au-TiO 2 core-shell structure can effectively prevent the aggregation of the Au nanoparticles, at the same time has a higher photocatalytic properties. (2) the use of block copolymer PS-b-PEO preparation of the precious metal - metal oxide Au-TiO the 2 Janus nanoparticles array. First PS-b-PEO/HAuCl 4 solution, TiO 2 precursor solution mixed, the HAuCl 4 and TiO , 2 selectively into the PEO microdomains formed a PEO / the HAuCl 4 / TiO the 2 nuclear PS-shell nano-composite micelles. This composite micelle by spin coating preparation monolayer organic - inorganic hybrid film, and placed under UV light irradiation, when the organic substrate is completely removed to form a Au-TiO 2 Janus Nanoparticles . The results show that, with the TiO 2 and Au-TiO 2 Composite Nanoparticles au-TiO , 2 Janus nanoparticles with higher photocatalytic activity. (3) the use of a block copolymer PS-b-PVP is prepared nanoscale organic - inorganic Janus particles. First PS-b-PVP/FeCl 3 in toluene, PVP and the FeCl 3 exist complexation by self-assembly can be formed to the PVP / FeCl 3 as the core and PS shell symmetry of spherical micelles, followed by adding a certain amount to the micellar solution of NaOH solution. NaOH on the one hand to adjust the pH value of the solution, on the other hand, can react with the FeCl 3 , and in this process, the micelles by the symmetrical structure becomes an asymmetric structure. Block copolymer PS-b-PVP and organic iron compound with - Janus inorganic particles having both the characteristic of nanometer sizes, and having anisotropic characteristics, and therefore has an important aspect in the preparation of the new nano material significance.

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