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Polymer Mediated Surface Forces

Turesson, Martin LU (2008)
Abstract
The issue of controlling the stability between colloidal particles in solution is important, at least for industrial applications,

relying on efficient flocculation or stable dispersions.



The objective of this thesis is to shed some light on fundamental mechanisms behind the interplay between attractive and repulsive forces,

in solutions containing colloids and polymers.



We approach the problem from a theoretical point of view, developing powerful simulation techniques dealing with polymeric systems. In particular we mimic effects of full equilibrium situations, wherein

polymers are allowed to diffuse between a narrow slit and a

surrounding bulk solution.... (More)
The issue of controlling the stability between colloidal particles in solution is important, at least for industrial applications,

relying on efficient flocculation or stable dispersions.



The objective of this thesis is to shed some light on fundamental mechanisms behind the interplay between attractive and repulsive forces,

in solutions containing colloids and polymers.



We approach the problem from a theoretical point of view, developing powerful simulation techniques dealing with polymeric systems. In particular we mimic effects of full equilibrium situations, wherein

polymers are allowed to diffuse between a narrow slit and a

surrounding bulk solution.



We observe long ranged electrostatic repulsions in confined

polyelectrolyte solutions, as well as oscillatory surface forces.

This seems to be coupled with a strong polyelectrolyte chain affinity to the surfaces, leading to an appreciable degree of

surface charge inversion.



Effects of increasing the intrinsic chain stiffness are also studied, revealing a crossover between two fundamentally different mechanisms of attraction, namely polymeric bridging and charge-charge correlation.



Hard sphere polymer systems are also investigated with focus on varying

monomer-surface affinities, bulk concentrations and chain architectures. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Prof. Podgornik, Rudi, Faculty of mathematics and physics, Ljubljana, Slovenia
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Polyelectrolyte Solutions, Charge Inversion, Monte Carlo Simulations, Depletion Stabilization, Correlation Attraction, Colloid stability
defense location
Auditorium B, Chemical Center, Lund
defense date
2008-05-22 10:30
ISBN
978-97-7422-194-7
language
English
LU publication?
yes
id
3e75dc56-ef25-445d-af5b-ac0e8976330c (old id 1058576)
date added to LUP
2008-04-28 13:11:01
date last changed
2016-09-19 08:45:19
@phdthesis{3e75dc56-ef25-445d-af5b-ac0e8976330c,
  abstract     = {The issue of controlling the stability between colloidal particles in solution is important, at least for industrial applications, <br/><br>
relying on efficient flocculation or stable dispersions. <br/><br>
<br/><br>
The objective of this thesis is to shed some light on fundamental mechanisms behind the interplay between attractive and repulsive forces, <br/><br>
in solutions containing colloids and polymers.<br/><br>
<br/><br>
We approach the problem from a theoretical point of view, developing powerful simulation techniques dealing with polymeric systems. In particular we mimic effects of full equilibrium situations, wherein <br/><br>
polymers are allowed to diffuse between a narrow slit and a <br/><br>
surrounding bulk solution. <br/><br>
<br/><br>
We observe long ranged electrostatic repulsions in confined <br/><br>
polyelectrolyte solutions, as well as oscillatory surface forces. <br/><br>
This seems to be coupled with a strong polyelectrolyte chain affinity to the surfaces, leading to an appreciable degree of <br/><br>
surface charge inversion.<br/><br>
<br/><br>
Effects of increasing the intrinsic chain stiffness are also studied, revealing a crossover between two fundamentally different mechanisms of attraction, namely polymeric bridging and charge-charge correlation.<br/><br>
<br/><br>
Hard sphere polymer systems are also investigated with focus on varying <br/><br>
monomer-surface affinities, bulk concentrations and chain architectures.},
  author       = {Turesson, Martin},
  isbn         = {978-97-7422-194-7},
  keyword      = {Polyelectrolyte Solutions,Charge Inversion,Monte Carlo Simulations,Depletion Stabilization,Correlation Attraction,Colloid stability},
  language     = {eng},
  school       = {Lund University},
  title        = {Polymer Mediated Surface Forces},
  year         = {2008},
}