氫氧基所造成之沸石外表面性質及其應用

Properties and Application of Hydroxyl Groups on the External Surface of Zeolites

張德安(Te-An Chang)

指導教授 ： 康敦彥

國立臺灣大學/工學院/化學工程學研究所/碩士(2020年)

https://doi.org/10.6342/NTU202002556

摘要

本研究探討沸石材料的外表面性質。過去沸石多以其高孔隙度與奈米等級孔徑而被應用於催化與分離等化工程序。然而，針對沸石外表面親水性的相關研究並不多，因此本研究探討沸石外表面親水特性的潛在應用價值。本研究的第一部分將研究純矽沸石外表面矽醇基對於水吸附的影響。我們透過設計實驗證實水分子主要吸附於純矽沸石的外表面。在本論文的第二部分，我們利用純矽沸石外表面超親水的特性，將其在玻璃基材上塗布成抗霧薄膜。我們利用濕式沉積法於玻璃基材上製備出高透明度、低霧度同時不受高溫環境限制的抗霧薄膜。此外，本論文也探討懸浮液的製備條件如何影響沸石晶體成膜時的堆積狀況與薄膜品質。我們期望透過本論文對於高密度親水基沸石的研究，未來能夠將外表面富含矽醇基的純矽沸石應用在水收集上。

關鍵字

沸石 ； 濕式沉積法 ； 沸石薄膜 ； 超親水表面 ； 抗霧塗層

並列摘要

Zeolites are crystalline microporous materials that can be used for catalysis and separation processes in the chemical industry owing to their high surface area and porosity. The hydroxyl groups on the external surface of zeolites, which makes them highly hydrophilic, have yet been well studied. In this thesis, we focus on the external surface properties of zeolite and explore the new applications based on their surface hydrophilicity. In the first part of this work, we discussed the water adsorption via silanol group on the external surface of pure silica zeolite. We designed experiments for demonstrating water mainly adsorbed on the external, instead of internal, surface of pure silica zeolites. In the second part, we utilized the pure silica with superhydrophilic external surface to form the anti-fogging coating on the glass substrate. We aimed to form high transmittance and low haze thin film with good thermal stability by direct wet deposition. We studied the droplet-spreading dynamics of the zeolite suspensions on a glass substrate to gain insight into the relationship between the physical properties of the cast solution and the quality of the film. The pure silica zeolite with silanol groups on the external surface can be used for the device of water harvesting.

並列關鍵字

Zeolites ； Direct wet deposition ； Zeolite thin film ； Super-hydrophilic surface ； Anti-fogging coating

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