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標題: | 石墨烯複合膜應用於鹽類離子篩除及阻氣之研究 Fabrication and characterization of graphene-nanosheets-based membranes for ion-sieving and gas-barrier applications |
作者: | 李承妍 Cheng-Yan Li |
指導教授: | 蔡豐羽 Feng-Yu Tsai |
關鍵字: | 石墨烯奈米片,篩鹽,阻氣,特定反向鹽通量,水氣滲透速率,高分子複材, graphene nanosheet,ion sieving,moisture barrier,specific reverse salt flux,water vapor transmission rate,polymer composite, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 由於石墨烯奈米片 (Graphene nanosheet, GNS) 具有不透氣性、疏水性、高長寬比的特性,以及堆疊成有序結構的傾向性,為篩鹽和阻氣方面的應用提供了強大的優勢。然而由於GNS之間具有強大的內聚力,難以將其分散在溶劑或聚合物基質中,故限制了GNS膜的開發。本研究通過溶劑製程、表面處理和聚合物分散穩定劑 (Dispersion-stabilizing agent, DSA) 的使用,開發了具有優異篩鹽和阻氣性能的GNS膜。基於理論估算和實驗驗證,我們確認N-乙烯基吡咯烷酮 (N-vinylpyrrolidone, NVP) 和溴苯為可分散GNS於親水和疏水環境中的良好溶劑。此外,我們發現聚乙烯吡咯烷酮 (polyvinylpyrrolidone, PVP)、乙烯基吡咯烷酮-乙酸乙烯酯共聚物 (poly(1-vinylpyrrolidone-co-vinyl acetate, PVPVA) 和環烯烃共聚物 (cyclic olefin copolymer, COC) 可作為有效的聚合物分散穩定劑,顯著增加NVP(對於PVP和PVPVA)和溴苯(對於COC)中GNS的最大分散濃度。加入DSA的GNS溶液被用於製備GNS/聚合物複合膜,其中GNS/PVPVA膜作為篩鹽膜,水通量和反向鹽通量比值 (Specific reverse salt flux, SRSF) 可達0.6 g L-1,與先進的正滲透篩鹽膜相當;而GNS/COC膜作為阻氣膜,水氣滲透速率可小於5 x 10-3 g/m2 day,比商用阻氣膜降低了數個數量級。此外,高環烯烴含量的COC複合薄膜相較於低環烯烴含量COC系統表現出更好的阻水氣性能,歸因於GNS在複合薄膜中增加的分散性。 Graphene nanosheet (GNS) offers strong advantages for ion-sieving and moisture-barrier applications owing to its gas-impermeable, hydrophobic, and high-aspect-ratio characteristics, and its tendency to stack into ordered structure with tunable nanochannels. However, the development of GNS-based films has been hampered by the difficulty of dispersing GNS in solvents or polymer matrices due to GNS’ strong cohesive forces. This study demonstrated GNS-based films with excellent ion-sieving and moisture-barrier properties through an approach combining solvent engineering, surface treatment, and exploring the use of polymer dispersion-stabilizing agents (DSA). Based on theoretical estimation and experimental verification, N-vinylpyrrolidone (NVP) and bromobenzene were identified as good solvents for dispersing GNS in hydrophilic and hydrophobic environment, respectively. Polyvinylpyrrolidone (PVP), poly(1-vinylpyrrolidone-co-vinyl acetate) (PVPVA), and cyclic olefin copolymer (COC) were found to be effective DSA in that they significantly increased the maximum dispersible GNS concentration in NVP (for PVP and PVPVA) and in bromobenzene (for COC). The DSA-added GNS solutions allowed casting of GNS/polymer composite films, of which GNS/PVPVA films achieved a specific reverse salt flux (SRSF) of 0.6 g L-1 as ion-sieving membranes, which was on par with that of the state-of-the-art ion-sieving membranes, while GNS/COC films exhibited a water vapor transmission rate of < 5 x 10-3 g/m2 day, an improvement over commercial moisture-barrier films by orders of magnitude. Moreover, the composite films with high-norbornene-content COC exhibited improved moisture-barrier performances compared to low-norbornene-content COC system, attributed to the enhanced dispersibility of GNS within the composite films. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/88560 |
DOI: | 10.6342/NTU202302698 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 材料科學與工程學系 |
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