奈米流體親水液滴的蒸發沉積圖案：溫度與表面活性劑的作用

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陳育澤(Yu-Ze Chen) 查詢紙本館藏

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能源工程研究所

論文名稱

奈米流體親水液滴的蒸發沉積圖案：溫度與表面活性劑的作用

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至系統瀏覽論文 (2025-11-9以後開放)

摘要(中)

液滴蒸發的咖啡環現象不只在日常生活中出現，對於噴墨列印、塗層技術等應用中，咖啡環現象的出現會降低產品品質或是性能等因素。因此，本研究在不同溫度的基板上，以及在懸浮溶液中添加不同濃度的表面活性劑(sodium dodecyl sulfate, SDS)兩種抑制咖啡環效應的方法，以達到獲得均勻沉積圖案的目的。在液滴蒸發的過程中，主要受到毛細流、表面張力梯度、溫度梯度引發的馬倫哥尼流以及液滴界面下降四種因素的影響，這些因素都會對液滴沉積的結果產生影響。
本文實驗在三種基板的溫度(30˚C、50˚C和70˚C)以及四種SDS濃度(0 wt %、0.05 wt %、0.50 wt %和1.00 wt %)下進行實驗。實驗結果顯示，只有在基板溫度為30˚C且SDS濃度為低濃度(0 wt %和0.05 wt %)時，沉積圖案為咖啡環。而提高SDS濃度(0.50 wt %和1.00 wt %)或是提高基板溫度(50˚C、70˚C)，實驗結果皆顯示大多數的粒子沉積於液滴內部或是中心區域，呈現了抑制咖啡環現象。

關鍵詞：咖啡環現象、噴墨列印、表面活性劑

摘要(英)

The coffee ring phenomenon observed during the evaporation of droplets occurs not only in everyday life but also in applications such as ink-jet printing and coating technologies. The coffee ring effect in these applications can negatively affect product quality and performance, among other factors. In this study, we employed two methods to suppress the coffee ring: varying the substrate temperature and adding different concentrations of surfactant (sodium dodecyl sulfate, SDS). The aim is to achieve a uniform deposition pattern. During the droplet evaporation process, four major factors influenced the droplet: capillary flow, surface tension gradients, Marangoni flow induced by temperature gradients, and the descent of the droplet interface. All of these factors can affect the final droplet deposition.
This study conducted experiments at three different temperatures (30˚C, 50˚C, and 70˚C) and with four different SDS concentrations (0 wt %, 0.05 wt %, 0.50 wt %, and 1.00 wt %). The experimental results reveal that coffee ring deposition pattern only occurs when the substrate temperature is at 30˚C and the SDS concentration is low (0 wt % and 0.05 wt %). Increasing the SDS concentration or raising the substrate temperature leads to most particles being depositing within the droplet or in its central region, demonstrating the suppression of the coffee ring phenomenon.

Keywords: coffee-ring phenomenon, inkjet printing, surfactant

關鍵字(中)

★ 咖啡環現象
★ 噴墨列印
★ 表面活性劑

關鍵字(英)

★ coffee-ring phenomenon
★ inkjet printing
★ surfactant

論文目次

摘要 ⅰ
Abstract ⅱ
目錄 ⅲ
圖目錄 ⅵ
表目錄 ⅹ
第一章緒論 1
1-1 研究動機 1
1-2 文獻回顧 3
1-2-1 改變粒子形狀與大小 8
1-2-2 溶質的影響 9
1-2-3 溫度效應 13
1-3 研究目的 14
第二章實驗系統 15
2-1 實驗裝置 15
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 17
2-1-4 影像系統 17
2-2 溶液調配 17
2-3 實驗條件設置 18
2-4 數據量測 19
第三章結果與討論 21
3-1 基板溫度30˚C 21
3-2 基板溫度50˚C 31
3-3 基板溫度70˚C 42
3-4 沉積圖案的表面均勻度 52
3-5 花瓣圖案的產生與消失 54
3-5-1 SDS濃度為0 wt % ~ 0.35 wt % 55
3-5-2 SDS濃度為0.50 wt % ~ 1.00 wt % 59
3-5-3 花瓣圖案的表面均勻度 62
3-5-4 液滴接觸角與直徑的變化 63
第四章結論與未來展望 66
4-1 結論 66
4-2 未來展望 66
參考文獻 68
附錄 72

參考文獻

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指導教授

鍾志昂(Chih-Ang Chung)

審核日期

2023-11-9

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