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Studies on an ester...
Studies on an ester-modified cationic amphiphile in aqueous systems: Behavior of binary solutions and ternary mixtures with conventional surfactants
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- Lundberg, Dan, 1975 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Unga, Johan, 1976 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Galloway, A. L. (författare)
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visa fler...
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Menger, F. M. (författare)
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visa färre...
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(creator_code:org_t)
- 2007
- 2007
- Engelska.
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Ingår i: Langmuir. - 1520-5827 .- 0743-7463. ; 23:23, s. 11434-11442
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Nyckelord
- SOLUTIONS
- C-13
- BROWNIAN PARTICLES
- SELF-DIFFUSION
- FIELD GRADIENT
- NUCLEAR-MAGNETIC-RESONANCE
- WATER
- NMR
- MICELLAR
- ASSOCIATION
- BROMIDE
- STUDYING TRANSLATIONAL DIFFUSION
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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