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研究生:林書緯
研究生(外文):Shu-Wei Lin
論文名稱:靜電紡絲之操作視窗的建構與分析
論文名稱(外文):The construction and analysis of operating window of electrospinning
指導教授:蘇淵源
口試委員:鄭國忠簡煥聲
口試日期:2012-06-19
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:107
中文關鍵詞:靜電紡絲錐體-射流MHDDPM
外文關鍵詞:ElectrospinningCone-jetMHDDPM
相關次數:
  • 被引用被引用:6
  • 點閱點閱:414
  • 評分評分:
  • 下載下載:33
  • 收藏至我的研究室書目清單書目收藏:0
奈米纖維的應用從細胞培養基材、過濾材料、醫療敷材及電子材料等,用途十分廣泛。傳統紡織法無法紡出直徑達奈米級的纖維,因此須仰賴電紡絲技術。電紡絲的製造原理為,利用高壓電使高分子溶液因電斥力而產生鞭甩運動 (whipping motion),在鞭甩的過程中使溶劑蒸發,並將溶液拉伸以達到奈米尺寸。
本文探討針頭型電極之電紡絲製程,使用有限體積法Fluent套裝軟體模擬三維立體射流,並利用Magnetic Hydrodynamics模組中的電位 (Electrical Potential) 創造電場,提供粒子額外所受之靜電力。搭配分相模組 (Discrete Phase Model) 耦合模擬粒子運動軌跡,觀察粒子出紡口後,在電場作用力影響下之運動變化。藉由改變操作電壓、工作距離、材料導電度、黏度、表面張力以及質量流率,探討各個參數對錐體-射流 (Cone-jet) 狀態時的電壓範圍影響趨勢。接著,探討主題從單根針頭延伸至雙根針頭,觀察其相互影響之情形。
最後取模擬結果與實驗作比較,可發現其誤差僅12.06 %,並且趨勢一致。此外,經由Scanning Electron Microscope (SEM) 觀察實驗得到的纖維,可發現當流率越大其纖維越粗,與模擬所得趨勢亦相同。因此,實驗與模擬相輔相成,印證模擬並預測趨勢為本研究之目的。


Nano-fiber extensively used in cells culture, ultra thin filtration membrane, implantable scaffold, and biosensor etc. Electro-spinning process is generally regarded as an effective way to fabricate nano-fibers. The electro-spinning principle for manufacturing nano-fibers is using high-voltage, which causing polymer solution to bring out the whipping motion because of the repulsion among electrons. The solvent would vaporize in the process of whipping motion, and the solution would be stretched to reach nano-size level.
This article studied the three-dimensional injection of electro-spinning process for a syringe needle type electrode by using the finite volume method Fluent. Electrical potential in Magnetic Hydrodynamics module (MHD) to create electric field was used to provide additional electrostatic force to the dispersed particles. The voltage range of Cone-jet in stabilization was studied by changing operating voltage, working distance, electrical conductivity, viscosity, surface tension and mass flow rate. Discrete Phase Model (DPM), coupling the particle motion simulation, the particle motion, due to the influence of electric field, was observed when particles leave the spinneret. Then, the subject is extended to twin needles. The interaction between two needles was examined. Finally, the electro-spinning experiments are performed to prove the applicable range of the simulations developed in this study.


摘 要 I
Abstract II
誌 謝 IV
目 錄 V
圖目錄 VIII
第一章 緒論 1
1.1 前言 1
1.2 纖維 2
1.3 纖維之製造技術 3
1.4 非織物 4
1.5 非織物之製造技術 5
1.6 靜電紡絲之原理 6
1.7 研究動機與目標 8
第二章 文獻回顧 9
2.1 聚乙烯醇(PVA) 9
2.2 奈米材料 12
2.3 靜電紡絲 14
第三章 數值模擬原理 19
3.1 假設條件 19
3.2 統御方程式(Governing equation) 19
3.3 電場(Electric Field) 21
3.4 Discrete Phase Model 22
第四章 實驗設備與紡製 25
4.1 材料參數測量設備 25
4.1.1 黏度計 25
4.1.2 表面張力計 26
4.1.3 電導度計 27
4.2 電紡絲製程與設備 28
第五章 模擬方法 32
5.1 模擬流程 32
5.2 模具尺寸與邊界設定 33
5.2.1 模具尺寸 33
5.2.2 邊界條件設定 36
第六章 結果與討論 38
6.1 穩態流動與非穩態流動 38
6.2 問題定義 39
6.3 流率(Flow Rate) 42
6.4 黏度(Viscosity) 48
6.5 表面張力(Surface Tension) 54
6.6 電導度(Electrical Conductivity) 60
6.7 工作距離(Working Distance) 66
6.8 實驗與模擬之比較 72
6.8.1 錐體-射流電壓範圍 72
6.8.2 纖維粗細與孔隙度 76
6.8.3 噴發 85
6.8.4 纖維累積之現象 91
6.9 雙根針頭 95
6.10 收斂 100
第七章 結論 101
參考文獻 103
符號彙編 106


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