Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
7632375
Reference Type
Journal Article
Title
Aggregation of novel betaine surfactants N-(3-alkoxy-2-hydroxypropyl)-N,N-dimethylglycines in aqueous solution: Micellization and microenvironment characteristics
Author(s)
Guan, JQ; Tung, CH; ,
Year
1999
Is Peer Reviewed?
1
Journal
Langmuir
ISSN:
0743-7463
EISSN:
1520-5827
Publisher
AMER CHEMICAL SOC
Location
WASHINGTON
Volume
15
Issue
4
Page Numbers
1011-1016
Language
English
DOI
10.1021/la971353n
Web of Science Id
WOS:000078682400021
Abstract
In aqueous solution aggregation behaviors and the microenvironment characteristics of the micelle assemblies of five novel betaine surfactants, N-(3-alkoxy-2-hydroxypropyl)-N,N-dimethylglycines, have been investigated by steady-state fluorescence and time-resolved fluorescence decay techniques using pyrene and 1,6-diphenyl-1,3,5-hexatriene as fluorescence probes. Critical micelle concentrations (cmc's), mean micelle aggregation numbers, micropolarities, and microviscosities of these surfactant micelles in the absence and presence of inorganic salt have been determined. Logarithmic cmc, logarithmic aggregation number, and logarithmic microviscosity of these surfactant micelles increase linearly with alkyl chain length but are moderately dependent on the concentration of added salt. The micropolarity of these surfactant micelles is also moderately dependent on salinity; however, contrary to cmc, aggregation number, and microviscosity, it is independent of the alkyl chain length. The microviscosity of these micelles is found to be severalfold higher than ionic micelles but is lower than that of nonionic micelles. These results suggest that those betaine zwitterionic surfactants are intermediate between ionic and nonionic surfactants in terms of aggregation behavior, micelle micropolarity, and micelle microviscosity.
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity