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Diblock polyampholytes grafted onto spherical particles: Effect of stiffness, charge density, and grafting density

Akinchina, Anna LU and Linse, Per LU (2007) In Langmuir 23(3). p.1465-1472
Abstract
The structure of spherical brushes formed by symmetric diblock polyampholytes end-grafted onto small spherical particles in aqueous solution is examined within the framework of the so-called primitive model using Monte Carlo simulations. The properties of the two blocks are identical except for the sign of their charges. Three different chain flexibilities corresponding to flexible, semiflexible, and stiff blocks are considered at various polyampholyte linear charge densities and grafting densities. The link between the two blocks is flexible at all conditions, and the grafted segments are laterally mobile. Radial and lateral spatial distribution functions of different types and single-chain properties are analyzed. The brush structure... (More)
The structure of spherical brushes formed by symmetric diblock polyampholytes end-grafted onto small spherical particles in aqueous solution is examined within the framework of the so-called primitive model using Monte Carlo simulations. The properties of the two blocks are identical except for the sign of their charges. Three different chain flexibilities corresponding to flexible, semiflexible, and stiff blocks are considered at various polyampholyte linear charge densities and grafting densities. The link between the two blocks is flexible at all conditions, and the grafted segments are laterally mobile. Radial and lateral spatial distribution functions of different types and single-chain properties are analyzed. The brush structure strongly depends on the chain flexibility. With flexible chains, a disordered polyelectrolyte complex is formed at the surface of the particle, the complex becoming more compact at increasing linear charge density. With stiff blocks, the inner blocks are radially oriented. At low linear charged density, the outer blocks are orientationally disordered, whereas at increasing electrostatic interaction the two blocks of a polyampholyte are parallel and close to each other, leading to an ordered structure referred to as a polyampholyte star. As the grafting density is increased, the brush thickness responds differently for flexible and nonflexible chains, depending on a different balance between electrostatic interactions and excluded volume effects. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
23
issue
3
pages
1465 - 1472
publisher
The American Chemical Society
external identifiers
  • wos:000243684100080
  • scopus:33847191785
ISSN
0743-7463
DOI
10.1021/la062481r
language
English
LU publication?
yes
id
0b275b81-2669-4994-a8c7-0d0c9a51d5d5 (old id 676120)
alternative location
http://cat.inist.fr/?aModele=afficheN&cpsidt=18473228
date added to LUP
2007-12-04 16:13:03
date last changed
2017-09-17 05:29:37
@article{0b275b81-2669-4994-a8c7-0d0c9a51d5d5,
  abstract     = {The structure of spherical brushes formed by symmetric diblock polyampholytes end-grafted onto small spherical particles in aqueous solution is examined within the framework of the so-called primitive model using Monte Carlo simulations. The properties of the two blocks are identical except for the sign of their charges. Three different chain flexibilities corresponding to flexible, semiflexible, and stiff blocks are considered at various polyampholyte linear charge densities and grafting densities. The link between the two blocks is flexible at all conditions, and the grafted segments are laterally mobile. Radial and lateral spatial distribution functions of different types and single-chain properties are analyzed. The brush structure strongly depends on the chain flexibility. With flexible chains, a disordered polyelectrolyte complex is formed at the surface of the particle, the complex becoming more compact at increasing linear charge density. With stiff blocks, the inner blocks are radially oriented. At low linear charged density, the outer blocks are orientationally disordered, whereas at increasing electrostatic interaction the two blocks of a polyampholyte are parallel and close to each other, leading to an ordered structure referred to as a polyampholyte star. As the grafting density is increased, the brush thickness responds differently for flexible and nonflexible chains, depending on a different balance between electrostatic interactions and excluded volume effects.},
  author       = {Akinchina, Anna and Linse, Per},
  issn         = {0743-7463},
  language     = {eng},
  number       = {3},
  pages        = {1465--1472},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Diblock polyampholytes grafted onto spherical particles: Effect of stiffness, charge density, and grafting density},
  url          = {http://dx.doi.org/10.1021/la062481r},
  volume       = {23},
  year         = {2007},
}