First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules

The adsorption of surfactants onto a hydrophobic interface, already laden with a fixed number of polymers, is studied using the self consistent field (SCF) calculation method of Scheutjens and Fleer. For polymers having unfavourable interactions with the surfactant molecules, the adsorption isotherm...

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Detalles Bibliográficos
Autores principales: Ettelaie, Rammile, Dickinson, Eric, Pugnaloni, Luis
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: Journal of Physics: Condensed Matter 2018
Materias:
Mixed surfactant + biopolymer films; First-order phase transition; Colloidal steric interactions
Acceso en línea:http://hdl.handle.net/20.500.12272/2771
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-2771
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic Mixed surfactant + biopolymer films; First-order phase transition; Colloidal steric interactions
spellingShingle Mixed surfactant + biopolymer films; First-order phase transition; Colloidal steric interactions
Ettelaie, Rammile
Dickinson, Eric
Pugnaloni, Luis
First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
topic_facet Mixed surfactant + biopolymer films; First-order phase transition; Colloidal steric interactions
description The adsorption of surfactants onto a hydrophobic interface, already laden with a fixed number of polymers, is studied using the self consistent field (SCF) calculation method of Scheutjens and Fleer. For polymers having unfavourable interactions with the surfactant molecules, the adsorption isotherms show an abrupt jump at a certain value of surfactant bulk concentration. Alternatively, the same behaviour is exhibited when the number of polymers on the interface is decreased. We show that this sudden jump is associated with a first-order phase transition, by calculating the free energy values for the stable and the metastable states at both sides of the transition point. We also observe that the transition can occur for two approaching surfaces, from a high surfactant coverage phase to a low surfactant coverage one, at sufficiently close separation distances. The consequence of this finding for the steric colloidal interactions, induced by the overlap of two polymer + surfactant films, is explored. In particular, a significantly different interaction, in terms of its magnitude and range, is predicted for these two phases. We also consider the relevance of the current study to problems involving the competitive displacement of proteins by surfactants in food colloid systems.
format Artículo
publishedVersion
Artículo
author Ettelaie, Rammile
Dickinson, Eric
Pugnaloni, Luis
author_facet Ettelaie, Rammile
Dickinson, Eric
Pugnaloni, Luis
author_sort Ettelaie, Rammile
title First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
title_short First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
title_full First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
title_fullStr First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
title_full_unstemmed First order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
title_sort first order phase transition during displacement of amphiphilic biomacromolecules from interfaces by surfactant molecules
publisher Journal of Physics: Condensed Matter
publishDate 2018
url http://hdl.handle.net/20.500.12272/2771
work_keys_str_mv AT ettelaierammile firstorderphasetransitionduringdisplacementofamphiphilicbiomacromoleculesfrominterfacesbysurfactantmolecules
AT dickinsoneric firstorderphasetransitionduringdisplacementofamphiphilicbiomacromoleculesfrominterfacesbysurfactantmolecules
AT pugnaloniluis firstorderphasetransitionduringdisplacementofamphiphilicbiomacromoleculesfrominterfacesbysurfactantmolecules
bdutipo_str Repositorios
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