NDLI: A bile acid-induced aggregation transition and rheological properties in its mixtures with alkyltrimethylammonium hydroxide

Content Provider	Royal Society of Chemistry (RSC)
Author	Hao, Jingcheng Liu, Changcheng Cui, Jiwei Song, Aixin
Copyright Year	2011
Abstract	A bile acid, lithocholic acid (LCA)-induced aggregation transition and rheological properties in the mixtures of LCA and alkyltrimethylammonium hydroxide were investigated. In the salt-free system of tetradecyltrimethylammonium hydroxide (TTAOH) and LCA at equimolar ratio, unilamellar vesicles were observed initially and then transferred to a suspension of tubes within several hours at 25 °C, even at a very low total concentration. When an equimolar amount of NaBr was added into the solutions at a higher temperature, huge vesicles with a diameter of tens to hundreds of micrometres were formed initially and crystals quickly emerged inside the vesicles when cooling to room temperature spontaneously. In the longer chain system of cetyltrimethylammonium hydroxide (CTAOH)/LCA, vesicles were also observed after the dissolution of LCA in CTAOH micelle solution, but the vesicles were transferred to helical ribbons after several days at higher concentrations and a lower temperature, and gel was obtained after a longer time of aging. The huge vesicles were more stable than those of the TTAOH/LCA system when an equimolar amount of NaBr was added. The tube suspensions of the TTAOH/LCA system at a high concentration formed a weak gel with relatively low viscoelastic properties, indicating a weak interaction between the aggregates. The tube and helical ribbon suspensions can quickly transfer to viscoelastic vesicular solutions when heated at 30 °C, indicating a reversible transition process.
Starting Page	8952
Ending Page	8960
Page Count	9
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	7
Issue Number	19
Journal	Soft Matter
DOI	10.1039/c1sm05635b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscoelasticity Rheology Weak interaction Micelle LCA Hydroxide
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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