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Title: | 探討奈米流道內水之介電性質 A Study on Dielectric Behavior of Water in Microfluidic Channel |
Authors: | Cheng-Kuei Liu 劉政揆 |
Advisor: | 蔡定平(Din Ping Tsai) |
Keyword: | 微流體,水,介電常數, microfluidic channel,water,dielectric constant, |
Publication Year : | 2009 |
Degree: | 碩士 |
Abstract: | 在如今大量運用奈米科技於生物物理研究的同時,我們對水在奈米尺度侷限的介電行為產生了興趣。我們認為水在奈米侷限下的行為會和在大體積時有極大的不同。許多相關的模擬研究成果已經發表,然而有些認為其介電會較大體積時為大,有些則認為會較大體積時為小,相關的研究並沒有一致的結果而仍有爭議,而研究水在奈米流道介電行為的實驗也非常少。也因此,我們希望能夠對於水在奈米尺度侷限下的介電係數作直接的測量,對此一仍不清楚而有待研究的議題能夠提出直接可信的實驗數據。進而可藉此數據,探討水分子在奈米侷限下的行為和動力學。在應用方面,發展出可提供測量奈米流道下各種溶液介電行為的可靠裝置。
本研究選擇以微製程的方式,利用金和銦錫氧化薄膜(ITO)等材料製作電極,並利用光阻來製作流道,再利用奈米微壓印機來封裝裝置,製造出尺度最小為100nm的微流道測量裝置,配合阻抗分析儀來測量水的介電常數。本實驗製做了各個不同尺度微流道的裝置,不同尺度下的裝置對於水的測量結果和已知的量測結果有著穩定的一致,也因此說明本實驗自行製作的裝置和所提供的量測結果是可靠的。 至於誤差分析分面也被小心的估算及處理。本實驗利用各種模擬分析方法估算可能所引入的誤差,並且對這些誤差作了適當的排除及處理。 根據本實驗目前實驗的結果,直到100nm 水的介電行為和在大體積時沒有太大的差異。 The dielectric property of water in nanoscale confinement is not well studied, due to the lack of direct measurement of the dielectric constant of water in such an environment. Many simulations of the dielectric constant of water in the DC case have been reported with indications that the dielectric constant of water will be smaller in a confined environment, though others propose dielectric constant will be larger, than that in the bulk limit. This issue remains controversial and awaits more experimental investigations. Our goal is to directly measure the dielectric constant of water in quasi-2D confined nanoslits through fabricated fluidic devices. We employed patterned photoresist to fabricate the fluidic channel with electrodes, and bonding is done using nanoimprint. We use an impedance analyzer to perform the measurement, which can provide the precise capacitance of the sample in low frequency range, and the parallel capacitance model is used to transfer the capacitance to the dielectric constant. So far, my work has been down to 100nm. It still shows no discrepancy with the bulk water. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/23144 |
Fulltext Rights: | 未授權 |
Appears in Collections: | 物理學系 |
Files in This Item:
File | Size | Format | |
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ntu-98-1.pdf Restricted Access | 101.81 MB | Adobe PDF |
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