| dc.description.abstract | This thesis is sorted by two parts as below:
Part I: Single encapsulation of gold nanoparticle into robust Zr-based metal-organic framework：Evolution of the alignments toward a single Au nanoparticle embedded into an individual UiO-66 nanocrystal: The realization of metal NPs for specific catalytic application is an intensively studied field where numerous efforts are investigated in modulating their active site via the incorporation of the other materials. Additionally, as small sized NPs possess high surface energy, agglomeration during catalytic reaction is presented. Therefore, materials incorporated with metal NPs should either prevent the agglomeration or provide the specific mechanism to tune their catalytic nature. In this study, Zr-based metal-organic frameworks, UiO-66, with microposity and milder synthetic condition is here investigated as the incorporating compositions while the gold NPs is selected as the prototype. By controlling the crystallization of UiO-66 nanocrystal under organic solution, a single particle of UiO-66 nanocrystal is able to encapsulate only one gold NP inside, Au@UiO-66. Notably, the metal precursor of UiO-66 in this study is selected as ZrOCl2 rather than ZrCl4 which often lead to the erosion of gold NPs. Furthermore, to tune the alignments of the Au@UiO-66, the organic solution in previous experiment is switch to the water-based system which is able provide the polarity to modulate the surfactant CTAB and CTAC for the further advanced alignments of Au@UiO-66. Consequently, the resulting chemically robust Au@UiO-66 materials is expected to provide more scopes to tune the catalytic capability of metal NPs as well as be the prototype to establish other Metal NPs@MOFs.
Part ll: Synthesis of Hierarchical Micro/Mesoporous Structure: Zr-based Metal-Organic Framework on SBA-15 for Enhanced Pervaporation of Water/Ethanol Mixtures: A new type of hierarchical micro/mesoporous structure (UiO-66@CAR-10) was achieved by heteroepitaxial growth of Zr-metal organic framework, UiO-66, on the functionalized silica mesoporous material, CAR-10. The synthesized hierarchical micro/mesoporous UiO-66@CAR-10 structure was examined by various spectroscopic techniques. In addition, the pervaporation measurements of the liquid water/ethanol mixture show that UiO-66@CAR-10/PVA (poly(vinylalcohol) mixed-matrix membrane exhibits enhanced performance both on the permeability and separation factor. Compared to the previous reports, this study provides a simple approach for synthesizing novel hierarchical porous composites exhibiting both advantages of mesoporous materials and microporous materials, which is expected to be useful for gas adsorption, separation, and catalysis.
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