研究生: |
陳鴻麟 Hung-Lin Chen |
---|---|
論文名稱: |
界劑擴散行為之形狀效應暨奈米顏料之研磨與分散 The Effect of Bubble Shape on Surfactant Diffusion and the Grinding and Dispersion of Nano-Pigment |
指導教授: |
林析右
Shi-Yow Lin |
口試委員: |
陳崇賢
Chorng-Shyan Chern 黃炳照 Bing-Joe Hwang 蔡瑞瑩 none 徐敬添 Ching-Tien Hsu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 148 |
中文關鍵詞: | 形狀效應 、擴散行為 、分散 、研磨 |
外文關鍵詞: | Diffusion, Effect of Bubble Shape, Dispersion, Grinding |
相關次數: | 點閱:173 下載:5 |
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第一部份本實驗室利用影像數位化懸掛氣泡表面張力測量儀,量測氣-液界面間的動態與平衡表面張力,再經由平衡表面張力γ(C)計算獲得吸附恆溫線Frumkin isotherm 理論模式之最適化參數,以傳統球狀氣泡模型(classical spherical model )來討論界劑吸附至氣泡表面的動態表面張力變化,並模擬出的擴散係數,但真實系統尚須考慮到針頭之存在與懸掛氣泡之真實氣-液界面。本研究使用CSM 系統之最佳參數和擴散係數,再以懸掛氣泡之有限元素模擬模型(pendant bubble finite element model)進一步探討針頭效應與真實氣泡的形狀效應對動態表面張力變化之影響。
在第二部份本研究使用濕式研磨技術將紅色顏料微粒分散至奈米級尺度後,再利用動態光散射儀來觀察顏料微粒顆粒大小之變化情形。研磨槽內使用平均粒徑為50 µm 的二氧化矽之間的撞擊力和介質與分散液間的剪切力,搭配對於紅色顏料具有高分散性與穩定性的分散劑A,使紅色顏料能穩定分散至奈米尺度。
Dynamic surface tension (DST) profiles were simulated based on an actual shape of pendant bubble and the existence of a needle. A time dependent finite element method was applied for this DST simulation in order to study more precisely the bulk diffusion of surfactant molecules. This numerical simulation resolves further the time-dependent concentration distribution of surfactant in bulk phase and the depth of solution needed in order to satisfy the infinite-solution assumption. The simulation data indicate that the needle size and bubble shape are the two major factors affecting the DST of surfactant bulk diffusion.
In the second part of this work, the dispersion of nano-magenta pigment was studied. By the beads milling technology with the help of a nonionic surfactant, the magenta pigment particles are dispersed and broken down to < 50 nm. The particle size and the size distribution of pigment were monitored by a dynamic light scattering during the milling process.
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