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聚乙烯醇複合血管支架之製備技術及其特性評估

為了解決zero two and hiro co的問題，作者林美辰 這樣論述：

本論文之目的為製備一具有核殼結構的複合支架。實驗方法為使用可降解的PVA紗線，以紗線加撚與緯編針織織造進行加工。再經由LFT製程製備內層為PVA紗線，而外層為PCL/PEG混合物的複合支架。研究評估PEG濃度對於複合支架之形貌、機械及生物特性。結果顯示，複合支架具備PVA紗線的柔軟性，以及緯編針織物的彈性，並且PEG的添加成功改善複合支架的性能。於PEG濃度為30 wt%時，複合支架的壓縮強力達到6.15±0.28 N，且細胞經過24小時之後的存活率達到97.32±5.39 %。此外，緯編針織及熱處理製程被用於支架型態的建立，最終將PEO透過靜電紡絲於支架外層。結果顯示，經由LFT技術加工之

支架仍具備長纖維的柔軟特性，可以進行織造。混合物的包覆以及PEO的紡絲對於組織工程支架之性能有良好的改善，支架的拉伸及壓縮強力分別可達到59.93±2.45 N及6.10±0.69 N，體外降解之過程穩定且水接觸角達到20.33o，細胞經過24小時之後的存活率達到80 %以上。而加載肝素鈉於固含量8 wt%之PEO靜電紡絲膜中，經過24小時之後的藥物釋放率達到28.09 %，顯示靜電紡絲藥物複合支架之功能性。經由本論文評估之靜電紡絲藥物複合支架具備良好的發展潛力，適合作為血管支架之結構。

以深共晶溶劑合成具層狀奈米結構的可見光釩酸鉍基光觸媒並應用於有機污染物去除之研究

為了解決zero two and hiro co的問題，作者Dhayanantha Prabu Jaihindh 這樣論述：

Photocatalysis is a series of advanced light-induced redox reaction processes resulting in the degradation and mineralization of organic pollutants in the presence of oxygen and water. Due to their capability to destroy contaminants under mild conditions, photocatalytic processes have attracted con

siderable attention in the field of waste-water treatment. However, photocatalytic reactions using the traditional pure TiO2 photocatalyst suffer from low energy efficiencies under solar irradiation. This low efficiency in the utilization of solar energy lies in its incapability in absorbing visible

lights and also the high recombination rate of photo-excited species in photocatalysts. In addition, difficulties in the separation of fluids from micro- or nano-scale catalysts in large scale systems substantially impact cost efficiency in practice.In this thesis, strategies are explored which add

ress these issues in order to improve the feasibility of solar photocatalysis. The preparation photocatalytic transition metal-oxide semiconductor materials are investigated, namely bismuth-based heterogeneous photocatalysts using Deep eutectic solvents (DESs) as green solvents. This research is foc

used on the design of visible-light-active metal-oxide photocatalysts to increase the absorption of visible light and to decrease the rates of electron-hole recombination, resulting in a high photocatalytic efficiency in regards to the degradation of organic pollutants. In First study deals synthesi

s of BiOCl/BiVO4 n- p heterojunction photocatalysts was synthesized using DESs reline (Choline chloride: Urea, 1:2) via simple one-pot sol-gel method at room temperature. BiOCl/BiVO4 sheet like structure was characterized and experimentally investigated for the degradation of Methylene blue, rhodami

ne B under visible light irradiation and also the mechanism was investigated using scavenger experiment. To improve the photocatalytic activity and electron-hole pair recombination time, the silver nanowires combined with BiOCl/BiVO4. Here, we report a one dimensional (1D) AgNWs combined with BiOCl/

BiVO4 photocatalysts. The BiOCl/BiVO4@5% Ag NWs photocatalysts exhibited the highest photoactivity, and the degradation efficiency of MB and RhB was 97% and 96% as compared to bare BiVO4 and BiOCl/BiVO4, respectively. The appearance of elemental AgNWs during the photocatalytic reaction would be in f

avor to enhanced visible light absorption, the facilitated photoinduced electrons transfer, and the enhanced separation of photoinduced electron−hole pairs contributed to the improvement of photocatalytic activities.Also, BiOCl/BiVO4@AgNWs photocatalysts are attributed to the formation of p-n hetero

junctions between BiOCl and BiVO4, leading to an effective separation of photo-generated electron hole pair. The significantly enhanced photocatalytic activity should be ascribed to thefabrication of a BiOCl/BiVO4 heterojunction, which can result in an efficient interfacial charge transfer, and it c

an be proved by Photoluminescence, Linear Sweep Voltammetry and Electrochemical Impedance Spectroscopy.The second study proposed, the preparation of hierarchically nanostructured shuriken like bismuth vanadate (BiVO4) as a bifunctional catalyst for photocatalytic degradation and electrochemical dete

ction of highly toxic hexavalent chromium (Cr(VI)) using the green Deep Eutectic Solvent reline by Solvothermal method, which allows morphology control in one of the less energy-intensive routes. The reline solvents leads the role of a latent supramolecular catalysts where the enhance in reaction ra

te from solvent driven pre-organization of the reactant is most remarkable. The SEM results showed a good dispersion of BiVO4 catalyst and the HR-TEM revealed an average particle size of ca. 5–10 nm. As a result, the BiVO4 exhibited good photocatalytic activity under UV-light about 95% reduction of

Cr(VI) to Cr(III) was observed in 160 min. The recyclability of BiVO4 catalyst exhibited an appreciable reusability and stability of the catalyst towards the photocatalytic reduction of Cr(VI). Also, the BiVO4-modified screen printed carbon electrode (BiVO4/SPCE) displayed an excellent electrochemic

al performance towards the electrochemical detection of Cr(VI). Besides, the BiVO4/SPCE demonstrated tremendous electrocatalytic activity, lower linear range (0.01–264.5 µM), detection limit (0.0035µM) and good storage stability towards the detection of Cr(VI). Importantly, the BiVO4 modified electr

ode was also found to be a good recovery in water samples for practical applications. The shape dependent nanostructured BiVO4 catalyst could also be used an effective electrode material for energy storage and hybrid capacitor in future.Keywords: Deep eutectic solvents, Bismuth based photocatalysts,

p-n heterojunction, organic pollutant removal, Cr(VI) removal, electrochemical sensing