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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳立仁 | zh_TW |
| dc.contributor.advisor | Li-Jen Chen | en |
| dc.contributor.author | 黃柏諺 | zh_TW |
| dc.contributor.author | Bo-Yan Huang | en |
| dc.date.accessioned | 2025-05-07T16:06:14Z | - |
| dc.date.available | 2025-05-08 | - |
| dc.date.copyright | 2025-05-07 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-04-25 | - |
| dc.identifier.citation | References
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97342 | - |
| dc.description.abstract | 疏水表面（hydrophobic surface）具有低表面能可以有效促進液滴的滑落。然而，疏水表面的低成核密度可能限制其在高效水收集系統中的應用。借鑒於生存在乾燥環境的甲蟲，雙親性表面（biphilic surface）結合了疏水與親水區域的特性，被認為能夠具備增強成核密度與液滴滑移能力，因此在同時提升水收集效率與熱傳效率方面具有潛在優勢。
NOA65平坦雙親性表面與溶膠凝膠法製備的平坦雙親性表面成功被製備透過以NOA65 光固化膠與二氧化矽奈米質地表面作為基材後續再進行疏水改質與多巴胺親水改質而成。然而，相較於NOA65雙親性表面，溶膠凝膠法製備的雙親性表面在增強親水點位的設計優化時有著顯著結構上穩定的優勢。藉由控制多巴胺反應濃度與時間來調控疏水表面上親水點位的密度與觀察其沉積生長的過程來進行一系列表面濕潤現象與凝結機制的探討。 研究結果顯示，在0.25 g/L 多巴胺濃度下，溶膠凝膠法製備的雙親性表面的 Cassie/Wenzel 濕潤現象轉換發生於多巴胺反應時間為22.5分鐘的時候。在凝結過程中，透過統計與量化不同凝結時間下液滴的數量與尺寸來分析表面上液滴數量密度、累積水量與液滴表面覆蓋率。此外，透過光學顯微鏡觀察下，疏水表面進行多巴胺親水改質後發現其成核密度有顯著提升。液滴式/薄膜式凝結模式的轉換界線延遲至多巴胺反應時間為27.5分鐘的時候。水收集效率隨著多巴胺反應時間的增加而提升，但液滴自然滑落直徑的最小值出現在20分鐘多巴胺反應條件下。在熱傳表現分析下，熱傳導係數在Cassie/液滴式凝結模式下皆有增加其中最大增幅41.7% 發生在10分鐘的多巴胺反應條件下。透過整合接觸角測量、收集水量與熱傳表現的結果進一步加深對雙親性表面獨特特性與其應用性。 | zh_TW |
| dc.description.abstract | A hydrophobic surface with low surface energy can improve the droplet removal capability. However, the low nucleation density of a hydrophobic surface can limit its application on high water harvesting efficiency. Inspired by the beetle living in a dehydrated environment, a biphilic surface with hydrophobic and hydrophilic properties is considered to enhance nucleation density and droplet mobility, thus providing significant potential for improving water harvesting efficiency and heat transfer performance.
In this study, NOA65 flat biphilic surface and sol-gel flat biphilic surface are successfully fabricated by using Norland Optical Adhesive 65 (NOA65) and silica nano-textured surface as substrates, followed by hydrophobic modification and dopamine- hydrophilic treatment. In comparison with the NOA65 biphilic surface, the sol-gel biphilic surface offers a significant advantage in structural stability, allowing for the design of optimized hydrophilic sites. By adjusting the dopamine concentration and reaction time, a series of investigations are conducted to examine surface wettability and condensation mechanism, with the objective of controlling the nucleation density and observing the growth of deposition on the hydrophobic surface. This study demonstrates that, at a fixed dopamine concentration of 0.25 g/L, the Cassie/Wenzel transition boundary of the sol-gel biphilic surface occurred at 22.5 minutes of dopamine reaction time. During the condensation process, the droplet number density, accumulative water volume, and surface coverage were analyzed by statistically quantifying the number and size of droplets at different condensation times. The nucleation density on dopamine-treated substrates shows a notable enhancement under microscopy observation. The dropwise/filmwise condensation transition boundary is extended to 27.5 minutes of dopamine reaction time. The water harvesting efficiency exhibits a positive correlation with dopamine reaction time, but the lowest natural departure diameter is recorded at 20 minutes of dopamine reaction time. The heat transfer analysis reveals that the heat transfer coefficient (HTC) increased under Cassie /dropwise condensation mode, with the maximum enhancement of 41.7% at 10-minute of dopamine reaction time. The integration of contact angle measurements, water harvesting efficiency, and heat transfer performance can provide a deeper understanding of unique characteristics and further applications of biphilic surface. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-05-07T16:06:14Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-05-07T16:06:14Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Contents
論文口試委員審定書 i 謝辭 ii 摘要 iii Abstract iv Contents vi List of Figures viii List of Tables xvi Chapter 1 Introduction 1 Chapter 2 Literature Review 4 2.1 Wetting phenomenon and contact angle 4 2.1.1 Ideal solid surface 4 2.1.2 Non-ideal solid surfaces 6 2.1.3 Advancing/receding contact angles and contact angle hysteresis 8 2.2 Introduction of biphilic surfaces 9 2.2.1 Layer-by-layer assembly method 12 2.2.2 Electrospinning method 14 2.2.3 Etching method 14 2.2.4 Selective modifications of surface substance 15 2.3 Atmospheric water condensation on hybrid surface 17 2.3.1 Heat transfer efficiency 17 2.3.2 Water collection performance 20 2.4 Hydrophilicity modification with polydopamine deposition 22 Chapter 3 Experimental Method 25 3.1 Materials 25 3.2 Scientific instruments 27 3.3 Experiment procedure 28 3.3.1 Biphilic surface from NOA65 surface with superhydrophobic coating 28 3.3.2 Biphilic surfaces from sol-gel method with silanization 34 3.3.3 Contact angle measurement 37 3.3.4 Sliding angle measurement 38 3.3.5 Condensation process 38 Chapter 4 Results and Discussion 41 4.1 Biphilic surface from NOA65 surface with superhydrophobic coating 41 4.1.1 The contact angle measurement and wetting states 41 4.1.2 Condensation analysis 51 4.2 Biphilic surface using sol-gel method with silanization 72 4.2.1 Effects of surface treatments with various conditions 72 4.2.2 The contact angle measurement and wetting states 85 4.2.3 Horizontal condensation analysis 90 4.2.4 Vertical condensation analysis for dopamine concentration 98 4.2.5 Heat transfer analysis for dopamine concentration 108 4.3 Comprehensive discussion 112 Chapter 5 Conclusion 120 References 123 | - |
| dc.language.iso | en | - |
| dc.subject | 多巴胺 | zh_TW |
| dc.subject | 熱傳 | zh_TW |
| dc.subject | 收集水效率 | zh_TW |
| dc.subject | 凝結過程 | zh_TW |
| dc.subject | 濕潤現象 | zh_TW |
| dc.subject | 雙親性表面 | zh_TW |
| dc.subject | condensation | en |
| dc.subject | surface wettability | en |
| dc.subject | dopamine | en |
| dc.subject | biphilic surface | en |
| dc.subject | heat transfer | en |
| dc.subject | water harvesting efficiency | en |
| dc.title | 表面濕潤性與凝結行為之研究：雙親性表面的設計與最佳化 | zh_TW |
| dc.title | Study of Surface Wettability and Condensation Behavior: Design and Optimization of Biphilic Surfaces | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 林析右;蔡瑞瑩;葉冠瑜 | zh_TW |
| dc.contributor.oralexamcommittee | Shi-Yow Lin;Ruey-Yug Tsay;Kuan-Yu Yeh | en |
| dc.subject.keyword | 雙親性表面,多巴胺,濕潤現象,凝結過程,收集水效率,熱傳, | zh_TW |
| dc.subject.keyword | biphilic surface,dopamine,surface wettability,condensation,water harvesting efficiency,heat transfer, | en |
| dc.relation.page | 132 | - |
| dc.identifier.doi | 10.6342/NTU202500866 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2025-04-25 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 化學工程學系 | - |
| dc.date.embargo-lift | 2029-04-24 | - |
| 顯示於系所單位： | 化學工程學系 | |
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|---|---|---|---|
| ntu-113-2.pdf 未授權公開取用 | 10.59 MB | Adobe PDF | 檢視/開啟 |
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