Block polyelectrolytes and colloidal stability.
(2008) In Journal of Colloid and Interface Science 329(1). p.67-72- Abstract
- We simulate interactions between charged flat surfaces in the presence of block polymers, where the end blocks carry a charge opposite to the surfaces. Using a recently developed simulation technique, we allow full equilibrium, i.e. the chemical potential of the polyelectrolyte is retained as the separation is changed. In general, the block polyions will adsorb strongly enough to overcharge the surfaces. This results in a double layer repulsion at large separation, with a concomitant free energy barrier. At short separations, the surfaces are pulled together by bridging forces. We make some efforts to theoretically design the polymers to be efficient flocculants, i.e. minimize the free energy barrier and still allow for a long-ranged... (More)
- We simulate interactions between charged flat surfaces in the presence of block polymers, where the end blocks carry a charge opposite to the surfaces. Using a recently developed simulation technique, we allow full equilibrium, i.e. the chemical potential of the polyelectrolyte is retained as the separation is changed. In general, the block polyions will adsorb strongly enough to overcharge the surfaces. This results in a double layer repulsion at large separation, with a concomitant free energy barrier. At short separations, the surfaces are pulled together by bridging forces. We make some efforts to theoretically design the polymers to be efficient flocculants, i.e. minimize the free energy barrier and still allow for a long-ranged bridging attraction. Here, we also take into account the possibility of nonequilibrium circumstances, which may be relevant in practice. Our results suggest that short chains, with small charged end blocks and a (relatively speaking) long neutral mid block, are likely to promote rapid flocculation. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1262127
- author
- Turesson, Martin LU ; Åkesson, Torbjörn LU and Forsman, Jan LU
- organization
- publishing date
- 2008
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Colloid and Interface Science
- volume
- 329
- issue
- 1
- pages
- 67 - 72
- publisher
- Elsevier
- external identifiers
-
- pmid:18929372
- scopus:55349130287
- ISSN
- 1095-7103
- DOI
- 10.1016/j.jcis.2008.09.049
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)
- id
- 43bb7aa2-4ddf-42ea-a552-1a043e4a8ce7 (old id 1262127)
- date added to LUP
- 2016-04-01 12:34:21
- date last changed
- 2023-01-03 18:32:05
@article{43bb7aa2-4ddf-42ea-a552-1a043e4a8ce7,
abstract = {{We simulate interactions between charged flat surfaces in the presence of block polymers, where the end blocks carry a charge opposite to the surfaces. Using a recently developed simulation technique, we allow full equilibrium, i.e. the chemical potential of the polyelectrolyte is retained as the separation is changed. In general, the block polyions will adsorb strongly enough to overcharge the surfaces. This results in a double layer repulsion at large separation, with a concomitant free energy barrier. At short separations, the surfaces are pulled together by bridging forces. We make some efforts to theoretically design the polymers to be efficient flocculants, i.e. minimize the free energy barrier and still allow for a long-ranged bridging attraction. Here, we also take into account the possibility of nonequilibrium circumstances, which may be relevant in practice. Our results suggest that short chains, with small charged end blocks and a (relatively speaking) long neutral mid block, are likely to promote rapid flocculation.}},
author = {{Turesson, Martin and Åkesson, Torbjörn and Forsman, Jan}},
issn = {{1095-7103}},
language = {{eng}},
number = {{1}},
pages = {{67--72}},
publisher = {{Elsevier}},
series = {{Journal of Colloid and Interface Science}},
title = {{Block polyelectrolytes and colloidal stability.}},
url = {{http://dx.doi.org/10.1016/j.jcis.2008.09.049}},
doi = {{10.1016/j.jcis.2008.09.049}},
volume = {{329}},
year = {{2008}},
}