Electrostatic Interactions in Complex Liquids : A Thermodynamic Analysis Based on the Poisson-Boltzmann Equation and the Flexible Surface Model
(1998)- Abstract
- The aim of this study was to analyse physico-chemical properties of some complex liquids using the Poisson-Boltzmann (PB) cell model; to extend the theory to cover bilayer systems with complex global geometry; finally to apply this new extended model to such bilayer systems.
The PB cell model provides a practical tool to examine counterion association and phase behaviour for structures of simple geometries; cylindrical and spherical. The model applies to self-assembled aggregates of ionic surfactants as well as to a polyelectrolyte system.
The framework of the PB cell model provides a consistent route to derive the electrostatic contribution to Helfrich's bending energy at finite salt- and surfactant... (More) - The aim of this study was to analyse physico-chemical properties of some complex liquids using the Poisson-Boltzmann (PB) cell model; to extend the theory to cover bilayer systems with complex global geometry; finally to apply this new extended model to such bilayer systems.
The PB cell model provides a practical tool to examine counterion association and phase behaviour for structures of simple geometries; cylindrical and spherical. The model applies to self-assembled aggregates of ionic surfactants as well as to a polyelectrolyte system.
The framework of the PB cell model provides a consistent route to derive the electrostatic contribution to Helfrich's bending energy at finite salt- and surfactant concentrations. The bending energy concept, with the extension of a variable electrostatic contribution to the bending rigidity, the saddle splay modulus, and the product (bending rigidity)*Ho (where Ho is the spontaneous mean curvature) was adopted for the description of the fluid mono- and bilayer phases, bicontinous microemulsion and L3 (sponge), respectively.
This formalism successfully describes many features of a ionic microemulsion system and the inclusion of both salt and surfactant concentration dependence was necessary for this purpose.
The same formalism provided the basis for a model description of the ternary system AerosolOT/NaCl/Water. A theoretical phase diagram, containing the L3 phase in competition with the lamellar phase and dilute solution, was calculated. The calculations captured the features typical for L3: narrowness in the one phase region and the characteristic sequence of phase transitions. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/38358
- author
- Carlsson, Ingemar LU
- supervisor
- opponent
-
- Prof Evans, Fennell, Dept. of Chemical Engineering and Materials Science, University of Minnesota
- organization
- publishing date
- 1998
- type
- Thesis
- publication status
- published
- subject
- keywords
- AOT, AerosolOT, ionic surfactant, spontaneous curvature, bending modulus, bending energy, Helfrich curvature energy, fluid membrane, complex liquid, flexible surface model, micelle, counterion, Poisson-Boltzmann equation, cell model, L3 phase, sponge phas, Physical chemistry, Fysikalisk kemi
- pages
- 200 pages
- publisher
- Physical Chemistry 1, Lund University
- defense location
- Room E, Center for Chemistry and Chemical Engineering, Lund University
- defense date
- 1998-02-07 10:15:00
- external identifiers
-
- other:ISRN: LUNKDL/NKFK--98/1022--SE
- ISBN
- 91-628-2839-8
- language
- English
- LU publication?
- yes
- id
- 869fd17f-b211-47db-8c4e-30f82be1ad1c (old id 38358)
- date added to LUP
- 2016-04-04 10:36:40
- date last changed
- 2018-11-21 20:59:45
@phdthesis{869fd17f-b211-47db-8c4e-30f82be1ad1c,
abstract = {{The aim of this study was to analyse physico-chemical properties of some complex liquids using the Poisson-Boltzmann (PB) cell model; to extend the theory to cover bilayer systems with complex global geometry; finally to apply this new extended model to such bilayer systems.<br/><br>
<br/><br>
The PB cell model provides a practical tool to examine counterion association and phase behaviour for structures of simple geometries; cylindrical and spherical. The model applies to self-assembled aggregates of ionic surfactants as well as to a polyelectrolyte system.<br/><br>
<br/><br>
The framework of the PB cell model provides a consistent route to derive the electrostatic contribution to Helfrich's bending energy at finite salt- and surfactant concentrations. The bending energy concept, with the extension of a variable electrostatic contribution to the bending rigidity, the saddle splay modulus, and the product (bending rigidity)*Ho (where Ho is the spontaneous mean curvature) was adopted for the description of the fluid mono- and bilayer phases, bicontinous microemulsion and L3 (sponge), respectively.<br/><br>
<br/><br>
This formalism successfully describes many features of a ionic microemulsion system and the inclusion of both salt and surfactant concentration dependence was necessary for this purpose.<br/><br>
<br/><br>
The same formalism provided the basis for a model description of the ternary system AerosolOT/NaCl/Water. A theoretical phase diagram, containing the L3 phase in competition with the lamellar phase and dilute solution, was calculated. The calculations captured the features typical for L3: narrowness in the one phase region and the characteristic sequence of phase transitions.}},
author = {{Carlsson, Ingemar}},
isbn = {{91-628-2839-8}},
keywords = {{AOT; AerosolOT; ionic surfactant; spontaneous curvature; bending modulus; bending energy; Helfrich curvature energy; fluid membrane; complex liquid; flexible surface model; micelle; counterion; Poisson-Boltzmann equation; cell model; L3 phase; sponge phas; Physical chemistry; Fysikalisk kemi}},
language = {{eng}},
publisher = {{Physical Chemistry 1, Lund University}},
school = {{Lund University}},
title = {{Electrostatic Interactions in Complex Liquids : A Thermodynamic Analysis Based on the Poisson-Boltzmann Equation and the Flexible Surface Model}},
year = {{1998}},
}