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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 江宏仁 | |
| dc.contributor.author | Chiao-Ying Chien | en |
| dc.contributor.author | 錢巧縈 | zh_TW |
| dc.date.accessioned | 2021-06-16T03:49:59Z | - |
| dc.date.available | 2017-01-28 | |
| dc.date.copyright | 2015-01-28 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2015-01-22 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55174 | - |
| dc.description.abstract | 在眾多驅動微流體的方法中，雷射掃描驅動流體的技術為近年來較為新穎且易於控制的非接觸性的驅動方法，可直接以掃描頻率控制微流體與雷射掃描反方向流動的速度。本實驗中是對此技術的應用範圍做拓展，利用紅外雷射動態掃描加熱，研究在微尺度中驅動高分子溶液形成的二維流場，並了解高分子的熱響應對流場的影響，期望未來能使雷射流場操控技術在不同複雜系統裡能夠依不同溶質對溫度場的特性進行靈活運用。本實驗主要研究方法是藉由觀察螢光聚苯乙烯粒子懸浮在聚乙二醇溶液流場中的速度，了解改變不同的雷射掃描頻率與其他因子（例如高分子溶液濃度或分子量等），所造成的流場現象。在本實驗的主要研究結果中，當外加雷射掃描以低頻率驅動流體時，二維流場與加熱環形區域周圍幾乎沒有交互作用，此流動有別於一般傳統低雷諾數下的徹體力造成的微尺度流場，也與先前發展的雷射驅動流體技術的流動方向相反。我們提出了可能的機制模型描述這個現象：聚乙二醇高分子在雷射動態掃描的過程中會受到熱泳性質的影響逃離動態熱源，達到穩態平衡後在環形區域形成只有高分子的流動 ，此高分子流動的流場現象可以做為支持熱泳理論中提出的熱泳為無外力介入運動的直接證據。 | zh_TW |
| dc.description.abstract | In this report, we used IR laser scanning to heat PEG solution to drive 2D fluid in a micro scale chamber. We verified scanning velocity of IR laser in different concentrations of PEG solutions, and studied the induced flow field by observed fluorescent PS particles dispersed in solutions. As a result, we observed a special phenomenon in low scanning velocity region, the induced fluid flow had same direction with laser scanning. Unlike ordinary flow field, this net flow only occurred in the heating region without disturbing surrounding. We proposed an explanation to describe this phenomenon. PEG thermophoretically drifted away from laser moving spot due to the temperature was increased locally by laser. This leaded to the asymmetric distribution of PEG and caused a net flow in same direction of laser scanning. This observed unique flow field supported that thermophoretic drifting is a motion caused by zero net external force. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T03:49:59Z (GMT). No. of bitstreams: 1 ntu-103-R01543035-1.pdf: 3937341 bytes, checksum: 24277eaad21bbd10f147845341d0a49d (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
誌謝 ii 中文摘要 iii ABSTRACT iv 目錄 v 圖目錄 vii 表目錄 x 第一章 緒論 1 1.1 前言 1 1.2 雷射微流體（Laser Microfluidics） 2 1.2.1 概述 2 1.2.2 光驅動流體（Optically Driven Fluid Flow） 4 1.2.3 雷射局部加熱與高分子在微流道中的交互作用 6 1.3 熱泳（Thermophoresis） 8 1.3.1 概述 8 1.3.2 膠體粒子熱泳概述 11 1.3.3 膠體粒子-高分子溶液 15 1.3.4 高分子熱泳 16 1.4 研究動機 20 第二章 實驗材料、儀器與實驗架設設計 21 2.1 聚乙二醇 21 2.2 聚苯乙烯粒子 24 2.3 BCECF Acid 25 2.4 電子束蒸鍍機 27 2.5 光路設計 29 2.6 實驗晶片裝置設計 31 2.7 其他 32 第三章 實驗流程與分析方法 33 3.1 實驗流程與雷射掃描 33 3.1.1 實驗流程 33 3.1.2 雷射掃描控制 34 3.2 影像剪輯及流場速度分析 36 3.2.1 擷取影像方法 36 3.2.2 追蹤粒子速度計算 36 3.3 實驗溫度量測方法 38 第四章 實驗結果與討論 41 4.1 實驗系統流動機制觀察 41 4.1.1 流場現象觀察 41 4.1.2 流場現象機制推測 45 4.1.3 順向流場的發生頻率範圍 48 4.1.4 逆向流場 49 4.1.5 頻率與雷射線速度 52 4.2 高分子光熱泳模型 54 4.3 驗證流場流動機制 55 4.3.1 改變追蹤粒子大小 55 4.3.2 量測瞬間溫度及溫度梯度 56 4.3.3 模擬雷射掃描的局部濃度分布趨勢 58 4.3.4 固定雷射線速度改變雷射功率 60 4.3.5 改變高分子溶液濃度 63 4.3.6 解釋濃度趨勢與順向流場速度 65 4.3.7 改變PEG分子量 68 4.3.8 不同分子量在高頻區的逆向流場速度 75 4.3.9 其它測試 77 第五章 結論與未來展望 79 參考文獻 80 | |
| dc.language.iso | zh-TW | |
| dc.subject | 聚乙二醇 | zh_TW |
| dc.subject | 雷射微流體 | zh_TW |
| dc.subject | 熱泳 | zh_TW |
| dc.subject | 高分子 | zh_TW |
| dc.subject | Polymer | en |
| dc.subject | Laser Microfluidics | en |
| dc.subject | Thermophoresis | en |
| dc.subject | Polyethylene Glycol | en |
| dc.title | 利用高分子光熱泳驅動微流體 | zh_TW |
| dc.title | Optically Driven Fluid Flow by PEG Thermophoretic Drifting | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 103-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 李雨,黎璧賢 | |
| dc.subject.keyword | 雷射微流體,熱泳,高分子,聚乙二醇, | zh_TW |
| dc.subject.keyword | Laser Microfluidics,Thermophoresis,Polymer,Polyethylene Glycol, | en |
| dc.relation.page | 82 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2015-01-23 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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