親水膠體液滴的蒸發特性及沉積圖案:溫度與表面活性劑的影響

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林宏瑋(Hong-Wei Lin) 查詢紙本館藏

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能源工程研究所

論文名稱

親水膠體液滴的蒸發特性及沉積圖案:溫度與表面活性劑的影響
(Evaporation characteristic and deposition pattern of hydrophilic colloid droplet: the effect of temperature and surfactant.)

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[相關文章]

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[完整記錄]

[館藏目錄]

至系統瀏覽論文 (2026-12-18以後開放)

摘要(中)

液滴蒸發在生活當中無所不在，而其中主要的現象「咖啡環效應」更是影響廣泛。
對於噴墨技術、表面塗層技術等領域，咖啡環效應會降低成品品質。因此本研究想要探
討溫度以及表面活性劑SDS(sodium dodecyl sulfate, SDS)兩種抑制咖啡環的因素，從而
獲得更加均勻的沉積圖案。在液滴蒸發的過程中，主要受到毛細流、表面張力梯度和溫
度梯度所引發的馬蘭戈尼流以及液滴擴展行為等因素的影響，從而改變液滴蒸發特性和
沉積圖案的結果。
本文實驗探討低於臨界膠束濃度(Critical micelle concentration，簡稱 CMC)下四種
SDS 濃度(0、0.025、0.05、0.15 wt%)以及四種基板溫度(25、35、40、50 °C)下進行實驗。
實驗結果顯示，在低SDS濃度(0、0.025 wt%)以及未加熱基板(25°C)條件下，沉積圖案
為咖啡環。而基板溫度上升後(35、40、50 °C)，則形成咖啡眼的沉積圖案。在高SDS濃
度(0.05、0.15 wt%)以及未加熱條件(25°C)下，液滴蒸發初期會產生擴展行為，沉積圖案
面積增加。而基板溫度上升後(35、40、50 °C)，液滴的擴展行為會減小。

摘要(英)

Droplet evaporation is ubiquitous in daily life, and the main deposition phenomenon
"coffee ring " usually appears. However, coffee ring effect will lower the quality of the products
in some application like inject printing, surface coating, etc. Therefore, the effect of temperature
and surfactant SDS (sodium dodecyl sulfate, SDS) for suppressing coffee ring effect is
considered in this study. During the droplet evaporation process, droplet is mainly affected by
capillary flow, and Marangoni flow which is induced by the gradient of surface tension, etc.
These mechanisms change the results of droplet evaporation characteristic and deposition
pattern.
In this experiment, four kinds of SDS concentration (0, 0.025, 0.05, 0.15 wt%) below the
critical micelle concentration (CMC) and four kinds of substrate temperature (25, 35, 40, 50 °C)
is considered. Experiment results show in lower SDS concentration (0, 0.025 wt%) and non
heated substrate temperature (25°C) cases, deposition pattern reveals coffee ring. For heated
substrate cases (35, 40, 50 °C), deposition pattern reveals coffee eye. In higher SDS
concentration (0.05, 0.15 wt%) and non-heated substrate temperature cases (25°C), contact line
spreading behavior is observed at the early stage of the droplet evaporation, lead to a larger area
pattern. For the heated substrate cases (35, 40, 50 °C), the spreading behavior is weakened.

關鍵字(中)

★ 液滴蒸發
★ 表面活性劑
★ 液滴擴展
★ 親水
★ 基板溫度

關鍵字(英)

★ droplet evaporation
★ surfactant
★ droplet spreading
★ hydrophilic
★ substrate temperature

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vi
第一章緒論 1
1-1 研究動機 1
1-2 文獻回顧 2
1-2-1咖啡環的產生與抑制 5
1-2-2 液滴的擴展行為 12
1-3 研究目的 13
第二章實驗系統 14
2-1 實驗裝置 14
2-1-1 注射系統 16
2-1-2 溫控系統 16
2-1-3 環境控制系統 16
2-1-4 影像系統 16
2-2 溶液調配 17
2-3 基板處理 18
2-4 實驗條件 18
2-5 數據測量 18
第三章結果與討論 19
3-1 液滴的初始條件和蒸發時間 19
3-2 蒸發過程和沉積圖案 21
3-2-1 溫度效應 22
3-2-2 表面活性劑濃度效應 33
3-3 液滴表面溫度分布 60
3-3-1 未添加SDS 60
3-3-2 SDS濃度0.025、0.05、0.15 wt% 63
3-4 沉積圖案的表面粗糙度 70
3-5 沉積樣態圖 74
3-6 接觸線擴展行為的削弱 75
第四章結論與未來展望 78
4-1 結論 78
4-2 未來展望 79
參考文獻 80
附錄 84
附錄A 溶液調配計算 84
附錄B 液滴接觸角的測量 86
附錄C 平均高度、平均粗糙度、均方根粗糙度的計算 88

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指導教授

鍾志昂(Chih-Ang Chung)

審核日期

2024-12-19

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