A Study of Stationary Phase Coating for MEMS μ-Gas Chromatographic Column

• Main Authors: Fu Yu-Mao, 傅裕懋
• Other Authors: Lu Chia-Jung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/36414383281266062617

碩士 === 輔仁大學 === 化學系 === 96 === Our research is to study the stationary phase materials for MEMS fabricated column of a -GC. Dimethylpolysiloxane (Rtx-1) is dynamically coated on -column to form a finite thickness stationary phase. (2-phenylethyl)trimethoxysilane (PETMS) react directly with -column wall to form a monolayer stationary phase. We compare the resolution of two stationary phase materials, which chromatographically separate 10-mixture components within less then 3 minutes, and the performances are different. The non-polar compounds have greater resolution in Rtx-1 phase. On the other hand, the polar compounds retained better in PETMS phase. We also use different temperature programs to investigate the changes of the peak capacity using a series of n-alkanes. Under the different flow rate, we use air as carrier gas and n-octane as test compound to probe the height equivalent to a theoretical plate (HETP) using Golay and Spangler model to fit Van Deemter plot. It is found that Rtx-1 have 4473 theoretical plates per meter and PETMS have 3795 theoretical plates per meter at optimized flow velocity.