2006-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/713093摘要：奈米粒子的純化(purification)對奈米科技產業而言相當重要，本計畫運用精良的流道設計得到奈米粒子篩選的有效成果，使奈米流體中的奈米粒子在篩選後，能嚴謹及精密地達到分類與收集的目的。在本計畫中，將利用微流道與中繼湖泊的想法及設計，以光阻製作微流道，並使用原子力顯微鏡(AFM)的量測探針頭（tip）控制流道的寬度，其寬度約為1 ，並推擠奈米粒子，讓較小的粒子在推擠過程中，更易於向下游移動，利於有效篩選奈米粒子粒徑的大小。除此，並會採用雷射聚焦提供奈米粒子吸引或利用外加電場的方式，配合篩選出奈米粒子。再者，將奈米粒子的收集成果，透過紫外-可見光譜圖(UV-Vis)分析對樣品鑑定，並進一步藉由穿透式電子顯微鏡(TEM)，電子繞射儀(ED)、元素分析儀(EDX)對其粒徑、成份及結晶結構分析和探討，配合適當的調整及設計，以完成符合需求的流道篩選技術。<br> Abstract: In many applications of nanotechnology, it becomes important to have a uniform size of nanoparticles in base fluids and on the substrate surfaces. The aim of this study is to sieve nanoparticles that are fabricated through either chemical or physical approach. In this study, a careful design of combinations of microchannels and microlakes can be used to separate nanoparticles that are either suspended or floating in the fluid flow in microchannels. The width of microchannel is around 1 mm. It is expected that smaller nanoparticles move faster than larger nanoparticles if microchannels can be designed properly. If possible, the nanoparticles with a uniform size can be collected in either microlakes or downstream exits. The microchannels and microlakes will be fabricated with photoresist. In addition, an AFM probe tip will be used to push the size walls of microchannels to control the channel width. In addition, the squeezing mechanism can push smaller nanoparticles to move ahead of larger nanoparticles suspended or floating in the fluid flow. An online optical system, UV-Vis spectrometer, will be installed to inspect the size of nanoparticles that flow through the measuring spot. After collecting the nanoparticles from the sieving process, TEM, ED, and EDX will be used to inspect the size, constitution, and crystal structure of the collected nanoparticles respectively. With an appropriate design of microchannels and microlakes, this study aims to sieve suspended or floating nanoparticles in a continuous flow through a squeezing mechanism on channel walls, a focused laser spot on nanoparticles, or an applied electrical field on the flow.微流道設計篩選奈米粒子microchannel designsieving nanoparticles