| Summary: | 博士 === 國立中央大學 === 化學工程與材料工程研究所 === 93 === This study was written to serve as a novel technique to fabricate nano-composite materials and photonic crystals via sol-gel process.
In Chapter 2, the organic-inorganic nano-composite materials have been prepared by using methyl methacrylate (MMA), 2-Hydroxyethyl methacrylate (HEMA) and tetraethoxysilane (TEOS) via the sol-gel process. Under the acid condition, 2,2’-azobisisobutyronnitrile (AIBN) was used as the initiator for the polymerization of MMA and HEMA monomer and various amounts of water was added for synthesizing the SiO2 network. It was found that transparent nano-composite materials could be prepared when acid catalyst and appropriate ethanol added into the reaction system. The products were characterized by GPC, ASAP, SEM and TGA thermograms. The results of TGA analysis show that the thermal properties of the PMMA-SiO2 and PHEMA-SiO2 nano-composite materials are improved.
In Chapter 3, the organic materials with SiO2 or ZrO2 highly coating microcapsule were successfully prepared in the alkaline condition. The products were characterized by SEM and TGA and DSC thermograms. The heat resistance of the products was improved more than 50℃,and the scale of the products were between 0.2~3 um.
In Chapter 4, I propose a novel technique to fabricate a free-standing three-dimensional photonic crystal by self-assembling the colloidal microspheres with controllable thickness from the air–liquid interface. Highly ordered three-dimensional photonic crystals are formed by polymethylmethacrylate or polystyrene monodisperse microspheres. We also demonstrate the fabrication technique of the free-standing inversed opals by removing the microspheres using calcination. The free-standing photonic crystal structures can be used for nano-photonic circuits, white-light LEDs or as a photocatalyst.
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