Abstract
| Language | English |
|---|---|
| Pages | 55-74 |
| Number of pages | 20 |
| Journal | Faraday Discussions |
| Volume | 128 |
| Early online date | 14 Sep 2004 |
| DOIs | |
| Publication status | Published - 2005 |
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Keywords
- acid
- ferrocyanide
- polyelectrolyte
- polymer
- sulfite
- gel
- molecular interaction
- neutron
- oscillation
- thermodynamics
Cite this
}
Responsive brushes and gels as components of soft nanotechnology. / Ryan, A.J.; Crook, C.J.; Howse, J.R.; Topham, P.; Jones, R.A.L.; Geoghegan, M.; Parnell, A.J.; Ruiz-Pérez, L.; Martin, S.J.; Cadby, A.; Menelle, A.; Webster, J.R.P.; Gleeson, A.J.; Bras, W.
In: Faraday Discussions, Vol. 128, 2005, p. 55-74.Research output: Contribution to journal › Article
TY - JOUR
T1 - Responsive brushes and gels as components of soft nanotechnology
AU - Ryan, A.J.
AU - Crook, C.J.
AU - Howse, J.R.
AU - Topham, P.
AU - Jones, R.A.L.
AU - Geoghegan, M.
AU - Parnell, A.J.
AU - Ruiz-Pérez, L.
AU - Martin, S.J.
AU - Cadby, A.
AU - Menelle, A.
AU - Webster, J.R.P.
AU - Gleeson, A.J.
AU - Bras, W.
N1 - Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005
Y1 - 2005
N2 - Progress in the development of generic molecular devices based on responsive polymers is discussed. Characterisation of specially synthesised polyelectrolyte gels, "grafted from" brushes and triblock copolymers is reported. A Landolt pH-oscillator, based on bromate/ sulfite/ferrocyanide, with a room temperature period of 20 min and a range of 3.1 <pH <7.0, has been used to drive periodic oscillations in volume in a pH responsive hydrogel. The gel is coupled to the reaction and changes volume by a factor of at least 6. A continuously stirred, constant volume, tank reactor was set-up on an optical microscope and the reaction pH and gel size monitored. The cyclic force generation of this system has been measured directly in a modified JKR experiment. The responsive nature of polyelectrolyte brushes, grown by surface initiated ATRP, have been characterised by scanning force microscopy, neutron reflectometry and single molecule force measurements. Triblock copolymers, based on hydrophobic end-blocks and either polyacid or polybase mid-block, have been used to produce polymer gels where the deformation of the molecules can be followed directly by SAXS and a correlation between molecular shape change and macroscopic deformation has been established. The three systems studied allow both the macroscopic and a molecular response to be investigated independently for the crosslinked gels and the brushes. The triblock copolymers demonstrate that the individual response of the polyelectrolyte molecules scale-up to give the macroscopic response of the system in an oscillating chemical reaction.
AB - Progress in the development of generic molecular devices based on responsive polymers is discussed. Characterisation of specially synthesised polyelectrolyte gels, "grafted from" brushes and triblock copolymers is reported. A Landolt pH-oscillator, based on bromate/ sulfite/ferrocyanide, with a room temperature period of 20 min and a range of 3.1 <pH <7.0, has been used to drive periodic oscillations in volume in a pH responsive hydrogel. The gel is coupled to the reaction and changes volume by a factor of at least 6. A continuously stirred, constant volume, tank reactor was set-up on an optical microscope and the reaction pH and gel size monitored. The cyclic force generation of this system has been measured directly in a modified JKR experiment. The responsive nature of polyelectrolyte brushes, grown by surface initiated ATRP, have been characterised by scanning force microscopy, neutron reflectometry and single molecule force measurements. Triblock copolymers, based on hydrophobic end-blocks and either polyacid or polybase mid-block, have been used to produce polymer gels where the deformation of the molecules can be followed directly by SAXS and a correlation between molecular shape change and macroscopic deformation has been established. The three systems studied allow both the macroscopic and a molecular response to be investigated independently for the crosslinked gels and the brushes. The triblock copolymers demonstrate that the individual response of the polyelectrolyte molecules scale-up to give the macroscopic response of the system in an oscillating chemical reaction.
KW - acid
KW - ferrocyanide
KW - polyelectrolyte
KW - polymer
KW - sulfite
KW - gel
KW - molecular interaction
KW - neutron
KW - oscillation
KW - thermodynamics
UR - http://www.scopus.com/inward/record.url?scp=19944434154&partnerID=8YFLogxK
UR - http://pubs.rsc.org/en/Content/ArticleLanding/2005/FD/b405700g#!divAbstract
U2 - 10.1039/b405700g
DO - 10.1039/b405700g
M3 - Article
VL - 128
SP - 55
EP - 74
JO - Faraday Discussions
T2 - Faraday Discussions
JF - Faraday Discussions
SN - 1359-6640
ER -