Search: id:"swepub:oai:research.chalmers.se:cbf2ede5-f388-4a3e-a22b-06e62ff56209" >
Studies on an ester...
Studies on an ester-modified cationic amphiphile in aqueous systems: Behavior of binary solutions and ternary mixtures with conventional surfactants
-
- Lundberg, Dan, 1975 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Unga, Johan, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
Galloway, A. L. (author)
-
show more...
-
Menger, F. M. (author)
-
show less...
-
(creator_code:org_t)
- 2007
- 2007
- English.
-
In: Langmuir. - 1520-5827 .- 0743-7463. ; 23:23, s. 11434-11442
- Related links:
-
https://research.cha...
Abstract
Subject headings
Close
- The aqueous behavior of an ester-modified cationic amphiphile with the molecular structure CH3CH2O(C=O)(CH2)(6)(C=O)O(CH2)sN+(CH3)(3)Br-, in the following referred to as A, has been investigated. Systems with A as the only solute, as well as different aqueous mixtures with conventional cationic surfactants, primarily dodecyltrimethylammonium bromide (DTAB), were included in the study. Isotropic solution samples were characterized using H-1 NMR, C-13 NMR, NMR diffusometry, and conductivity measurements, whereas liquid crystalline samples were investigated by optical polarization microscopy and small-angle X-ray diffraction. The results are compared to the behavior of the binary system of DTAB and water. A does not exhibit a typical surfactant behavior. When it is present as the only solute in a binary aqueous system, it forms neither conventional micelles nor liquid crystalline phases. However; there is clear evidence that it assembles with lower cooperativity into loose clusters at concentrations above 25-30 mM. When A is mixed with DTAB in solution, the two amphiphiles form mixed assemblies, the structure of which varies with the total amphiphile concentration. In concentrated mixtures with alkyltrimethylammonium surfactants, A can participate in hexagonal liquid crystalline phases even when it constitutes a significant fraction of the total amphiphile content.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Keyword
- SOLUTIONS
- C-13
- BROWNIAN PARTICLES
- SELF-DIFFUSION
- FIELD GRADIENT
- NUCLEAR-MAGNETIC-RESONANCE
- WATER
- NMR
- MICELLAR
- ASSOCIATION
- BROMIDE
- STUDYING TRANSLATIONAL DIFFUSION
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
-
Langmuir
(Search for host publication in LIBRIS)
To the university's database