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Swelling of micro-hydrogels with a crosslinker gradient

Boon, Niels LU and Schurtenberger, Peter LU (2017) In Physical Chemistry Chemical Physics 19(35). p.23740-23746
Abstract

A heterogeneous distribution of crosslinker in micro-hydrogels (microgels) results in a non-uniform polymer density inside the particles. Identifying the morphology of the hydrogel backbone enables a bottom-up approach towards the structural and rheological properties of microgel systems. On a local level we use a Flory-Rehner inspired model that focuses on highly swollen networks, characterized by a Poisson's ratio of 1/4. Our ab initio calculations take account for the nonuniform distribution of crosslinker species during the synthesis of poly(N-isopropylacylamide) (PNIPAM) microgels, yet the method is also applicable to other microgel architectures. We recover a single-particle density profile that is in close agreement with SAXS... (More)

A heterogeneous distribution of crosslinker in micro-hydrogels (microgels) results in a non-uniform polymer density inside the particles. Identifying the morphology of the hydrogel backbone enables a bottom-up approach towards the structural and rheological properties of microgel systems. On a local level we use a Flory-Rehner inspired model that focuses on highly swollen networks, characterized by a Poisson's ratio of 1/4. Our ab initio calculations take account for the nonuniform distribution of crosslinker species during the synthesis of poly(N-isopropylacylamide) (PNIPAM) microgels, yet the method is also applicable to other microgel architectures. We recover a single-particle density profile that is in close agreement with SAXS data. Comparison with experimental data confirms that the surface of the cross-linked particle is decorated with dangling polymers ends of considerable size.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
19
issue
35
pages
7 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85029444447
  • wos:000410585900016
ISSN
1463-9076
DOI
10.1039/c7cp02434g
language
English
LU publication?
yes
id
8b943402-9da6-408f-a05d-6a4539a7fa4e
date added to LUP
2017-10-04 10:23:52
date last changed
2018-01-16 13:20:35
@article{8b943402-9da6-408f-a05d-6a4539a7fa4e,
  abstract     = {<p>A heterogeneous distribution of crosslinker in micro-hydrogels (microgels) results in a non-uniform polymer density inside the particles. Identifying the morphology of the hydrogel backbone enables a bottom-up approach towards the structural and rheological properties of microgel systems. On a local level we use a Flory-Rehner inspired model that focuses on highly swollen networks, characterized by a Poisson's ratio of 1/4. Our ab initio calculations take account for the nonuniform distribution of crosslinker species during the synthesis of poly(N-isopropylacylamide) (PNIPAM) microgels, yet the method is also applicable to other microgel architectures. We recover a single-particle density profile that is in close agreement with SAXS data. Comparison with experimental data confirms that the surface of the cross-linked particle is decorated with dangling polymers ends of considerable size.</p>},
  author       = {Boon, Niels and Schurtenberger, Peter},
  issn         = {1463-9076},
  language     = {eng},
  number       = {35},
  pages        = {23740--23746},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Swelling of micro-hydrogels with a crosslinker gradient},
  url          = {http://dx.doi.org/10.1039/c7cp02434g},
  volume       = {19},
  year         = {2017},
}