請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59571
標題: | 開發Nafion®除水裝置並應用於微型氣相層析儀 Development of Nafion® Dehydrator for Micro Gas Chromatography |
作者: | Kuan-Ju Chiu 邱冠儒 |
指導教授: | 田維誠(Wei-Cheng Tian) |
關鍵字: | 微型氣相層析儀,除水,納菲薄膜R,濕氣,聚二甲基矽氧烷, micro gas chromatography,dehydration,NafionR,moisture,PDMS, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 近年來人們為了追求更好的生活,應用於環境監測與檢測人體呼吸之氣體檢測技術日益受到重視。在環境中根據不同的汙染物揮發性有機氣體 (VOCs) 特性及濃度,受曝者輕則身體不適,重則致命;在人體呼吸中氣體檢測技術亦可提供一早期診斷工具使病患提早治療。然而在此兩應用中水氣是影響檢測的因素,對於氣體檢測技術中的氣相層析儀之關鍵組件皆有一定影響。
氣體樣品中的水氣去除方式有許多種,然而不同的方式有對應的問題存在。本研究中利用市售之全氟磺酸聚四氟乙烯共聚物 (Nafion®) 薄膜作為水氣選擇性通透膜,搭配鍍有聚一氯對二甲苯 (Parylene C) 之聚二甲基矽氧烷 (PDMS) 為流道結合而成一除水裝置。除水裝置由PDMS之上下流道中間夾入一層Nafion®薄膜所組成,整體裝置體積10 cm × 5 cm × 3 cm,流道寬度為1 mm,流道之水氣交換區域面積為1 mm × 60 mm。依據採樣流量、乾空氣流量與濕度梯度差之不同,設計之除水裝置能使樣品濕度下降20% ~ 70%。以微型氣相層析儀進行實驗,在流速100 ml/min 及50 ml/min之採樣流量下,無論如何調變乾燥空氣流量其除水效果皆無顯著差異。以潮濕之六種標準品與除水後之六種標準品訊號相比,水氣訊號雖仍存在但訊號明顯下降,且除水後之丙酮訊號可明顯辨認,潮濕標準品則否。在長期使用下,潮濕樣品使系統訊號逐採樣次數而遞減最終下降至初始訊號之20% 後飽和;除水後之樣品以同一實驗流程操作則在60% 時達到飽和。將水氣交換區域提升二倍對於末端之水氣訊號變化並無顯著差異。本實驗成功將Nafion®結合低成本技術製造一可用於微型氣相層析儀之初代除水裝置,實驗中可將濕度約85%之水氣降為30%。未來可以將除水裝置進一步微小化並提高除水效率為目標。 In recent years, detection technologies for environment monitoring and human breath analysis have become increasingly crucial. In the ambient, there exists various volatile organic compounds (VOCs) that can probably cause the illness or even death of the human. From human breath analysis, the composition of VOCs in the exhaled air can be an early diagnostic indicator for personal health status. When performing VOCs detection, water vapor can interfere the performance of a detection such as a gas chromatography (GC). Several methods are applied to remove the water vapor, but they all can not solve the issues for our applications. Nafion® is selected as a selective water diffusion membrane in this study. By combining a Nafion® membrane with parylene C and PDMS, a complete dehydrator is formed to remove water vapor. The dehydrator is assembled by a Nafion® membrane sandwiched between two PDMS flow channels. The volume of the whole dehydrator is 10 cm × 5 cm × 3 cm, with a channel width of 1 mm, and a water exchange area of 60 mm 1 mm. This device is proved to lower the relative humidity (R.H.) from 20% to 70% based on the optimization of sampling flow rate, dry air flow rate and gradient of R.H. With our design of experiments, it is observed that the humidified sample mixture (water vapor with 6 VOCs) lower the intensity of the signal to 20% of the original signal while the dehydrated sample mixture decrease the intensity of the signal to 60% of the original signal. It is demonstrated that we have successfully developed a cost effective dehydrator prototype for a micro GC system and the water vapor in a compound mixture can be reduced from 85% to 30%. Further miniaturization and enhanced dehydration is analyzed and can be explored in the future. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/59571 |
DOI: | 10.6342/NTU201700745 |
全文授權: | 有償授權 |
顯示於系所單位: | 生醫電子與資訊學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-106-1.pdf 目前未授權公開取用 | 4.19 MB | Adobe PDF |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。