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

NCUIR > Engineering College > National Central University Department of Chemical & Materials Engineering > Electronic Thesis & Dissertation > Item 987654321/85660

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/85660

Title:	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
Authors:	林譽蓉;Lin, Yu-Jung
Contributors:	化學工程與材料工程學系
Keywords:	分散劑;液態狀固體;乳液;微凝膠;dispersing agent;liquid-like-solid;emulsion;microgel
Date:	2021-06-30
Issue Date:	2021-12-07 11:12:37 (UTC+8)
Publisher:	國立中央大學
Abstract:	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。;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.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	50	View/Open

社群 sharing

Loading...