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Oxygen-Controlled Phase Segregation in Poly(N‑isopropylacrylamide)/Laponite Nanocomposite Hydrogels

Mauroy, Henrik ; Zbigniew, Rozynek ; Plivelic, Tomás LU ; Fossum, Jon Otto ; Helgesen, Geir and Knudsen, Kenneth D. (2013) In Langmuir 29. p.371-379
Abstract
The combination of nanoparticles and polymers into nanocomposite

gels has been shown to be a promising route to creating soft materials with new or improved properties. In the present work, we have made use of Laponite nanoparticles in combination with a poly(N-isopropylacrylamide) (PNIPAAM)polymer and describe a phenomenon taking place during the polymerization and gelling of this system. The presence of small amounts of oxygen in the process induces two distinctly separated phases, one polymer-rich and one polymer-deficient water−clay phase. Complex interactions among clay, oxygen, and the polymer are found to govern the behavior of these phases. It is also observed that the initial clay concentration can be used to control the... (More)
The combination of nanoparticles and polymers into nanocomposite

gels has been shown to be a promising route to creating soft materials with new or improved properties. In the present work, we have made use of Laponite nanoparticles in combination with a poly(N-isopropylacrylamide) (PNIPAAM)polymer and describe a phenomenon taking place during the polymerization and gelling of this system. The presence of small amounts of oxygen in the process induces two distinctly separated phases, one polymer-rich and one polymer-deficient water−clay phase. Complex interactions among clay, oxygen, and the polymer are found to govern the behavior of these phases. It is also observed that the initial clay concentration can be used to control the volume fraction of the

polymer-deficient phase directly. The dynamics of the phase boundary is found to be dependent on water penetration and in general to exhibit non-Fickian behavior. An approach using video recording to monitor hydrogel swelling is also presented, and its advantages are addressed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Nanocomposite hydrogel, clay, Laponite, PNIPAAM, phase segregation, small angle x-ray scattering
in
Langmuir
volume
29
pages
371 - 379
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000313305900044
  • scopus:84872117103
  • pmid:23210524
ISSN
0743-7463
DOI
10.1021/la303889s
language
English
LU publication?
yes
id
1f04074f-81b9-45a0-9f8d-944ce2e607ee (old id 3411241)
date added to LUP
2016-04-01 10:42:45
date last changed
2020-01-12 05:10:42
@article{1f04074f-81b9-45a0-9f8d-944ce2e607ee,
  abstract     = {The combination of nanoparticles and polymers into nanocomposite<br/><br>
gels has been shown to be a promising route to creating soft materials with new or improved properties. In the present work, we have made use of Laponite nanoparticles in combination with a poly(N-isopropylacrylamide) (PNIPAAM)polymer and describe a phenomenon taking place during the polymerization and gelling of this system. The presence of small amounts of oxygen in the process induces two distinctly separated phases, one polymer-rich and one polymer-deficient water−clay phase. Complex interactions among clay, oxygen, and the polymer are found to govern the behavior of these phases. It is also observed that the initial clay concentration can be used to control the volume fraction of the<br/><br>
polymer-deficient phase directly. The dynamics of the phase boundary is found to be dependent on water penetration and in general to exhibit non-Fickian behavior. An approach using video recording to monitor hydrogel swelling is also presented, and its advantages are addressed.},
  author       = {Mauroy, Henrik and Zbigniew, Rozynek and Plivelic, Tomás and Fossum, Jon Otto and Helgesen, Geir and Knudsen, Kenneth D.},
  issn         = {0743-7463},
  language     = {eng},
  pages        = {371--379},
  publisher    = {The American Chemical Society (ACS)},
  series       = {Langmuir},
  title        = {Oxygen-Controlled Phase Segregation in Poly(N‑isopropylacrylamide)/Laponite Nanocomposite Hydrogels},
  url          = {https://lup.lub.lu.se/search/ws/files/2071011/3411898.pdf},
  doi          = {10.1021/la303889s},
  volume       = {29},
  year         = {2013},
}