期刊論文

標題 A method for preparing self-assembled gels from opaque solutions with high concentrations of AOT
學年 102
學期 1
出版(發表)日期 2013/09/01
作品名稱 A method for preparing self-assembled gels from opaque solutions with high concentrations of AOT
作品名稱(其他語言)
著者 Lai, Wei-Chi
單位 淡江大學化學工程與材料工程學系
出版者 Amsterdam: Elsevier BV
著錄名稱、卷期、頁數 Colloids and Surfaces A: Physicochemical and Engineering Aspects 433, pp.139–144
摘要 We study the phase behavior, rheology and structure of self-assembled gels prepared by adding minute amounts of water to organic solutions of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) at high concentrations. Macroscopic phase separation (opacity) occurred at high AOT concentrations in a range of organic solvents, such as hexane, heptane, and isooctane. Here, we found that when trace amounts of water were added to these opaque, heterogeneous solutions, AOT reverse micelles formed, and self-assembled, homogeneous gels were obtained. Gels prepared from AOT in hexane, by adding different amounts of water, were chosen in this study. The rheological measurements demonstrated that the samples exhibited the gel-like behaviors. The tendency of G′ and G″ implies that the transition had a disperse spectrum of relaxation times. Small-angle X-ray scattering (SAXS) results attested that the gels showed a hexagonally closed-packed cylindrical structure, and that the structure was quite stable up to at least 75 ̊C. The radius of a micellar cylinder was around 1.35–1.40 nm, depending on the addition of different water contents by SAXS. However, the radius of a cylinder did not change significantly in solvents (heptane and isooctane) other than hexane. The AOT cylinders can self-assemble into fiber bundles of 1–10 μm in diameter with rough alignment, as observed by a polarized optical microscope (POM).
關鍵字 AOT; Self-assembled; Gels; Phase separation; SAXS
語言 英文
ISSN 0927-7757
期刊性質 國外
收錄於 SCI;EI
產學合作
通訊作者 Lai, Wei-Chi
審稿制度
國別 荷蘭
公開徵稿
出版型式 紙本