液態固體作為膠體懸浮液的分散機制

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姓名

林譽蓉(Yu-Jung Lin) 查詢紙本館藏

畢業系所

化學工程與材料工程學系

論文名稱

液態固體作為膠體懸浮液的分散機制
(Liquid-like solid as dispersing mechanism for colloidal suspension)

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至系統瀏覽論文 (2026-7-1以後開放)

摘要(中)

分散劑通常添加到膠體懸浮液中以防止顆粒聚集或沉降。在這項工作中，基於液體狀固體（LLS）的概念開發了一種新的分散劑機制。 LLS材料包括Carbopol溶液和乳化玻璃，他們的彈性模量超過了黏性模量。在形成LLS之後，通過自然沉降和離心檢查微米級顆粒如Al2O3，CuO和SiC的懸浮液的穩定性，另外還研究了高溫對懸浮液的影響。結果，至少三週沒有沉澱，並且以1000 rpm離心5分鐘不會出現固液分離。而且，該懸浮液可以在60℃保持穩定5個小時以上。基於LLS的分散體的高穩定性歸因於在Carbopol的填充顆粒狀微凝膠之間的堵塞結構以及在乳化玻璃中擁擠的液滴之間的堵塞結構。

摘要(英)

A dispersing agent (dispersant) is often added to a colloidal suspension to prevent the clustering or settling of particles. In this work, a new mechanism of dispersant is developed based on the concept of liquid-like solid (LLS). The LLS materials including Carbopol solution and emulsion glass possess the elastic modulus exceeding the viscous modulus. After the formation of LLS, the stability of the suspension of micron-sized particles such as Al2O3, CuO, and SiC is examined by sedimentation and centrifugation. The effect of high temperature is studied as well. In general, the sedimentation is absent for at least three weeks and no solid-liquid separation appears by centrifugation at 1000 rpm for 5 min. Moreover, the suspension can remain stable at 60 ℃ for more than 5 hours. High stability of the dispersion based on LLS is attributed to the jammed structure among packed granular-scale microgels of Carbopol and among crowed droplets in emulsion glass.

關鍵字(中)

★ 分散劑
★ 液態狀固體
★ 乳液
★ 微凝膠

關鍵字(英)

★ dispersing agent
★ liquid-like-solid
★ emulsion
★ microgel

論文目次

摘要......................................................i
ABSTRACT.................................................ii
致謝.....................................................iii
LIST OF CONTENTS..........................................iv
LIST OF FIGURES............................................v
CHAPTER 1 INTRODUCTION.....................................1
CHAPTER 2 EXPERIMENT.......................................4
2-1 Materials.............................................4
2-2 Preparation of the aqueous suspension with polymer
dispersant............................................4
2-3 Preparation of the suspension with 5 wt% non-aqueous
solution of Span 80...................................5
2-4 Rheological characterizations and Optical microscope..5
2-5 Centrifugation tests..................................5
CHAPTER 3 RESULT AND DICUSSION.............................6
3-1 AQUALAP TTV as dispersant.............................6
3-2 Microgel Carbopol as dispersant......................11
3-3 Non-aqueous surfactant solution as a dispersant......17
CHAPTER 4 CONCLUSION......................................25
CHPATER 5 REFERENCE.......................................26

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指導教授

曹恆光(Heng-Kwong Tsao)

審核日期

2021-6-30

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