Responsive brushes and gels as components of soft nanotechnology

A.J. Ryan, C.J. Crook, J.R. Howse, P. Topham, R.A.L. Jones, M. Geoghegan, A.J. Parnell, L. Ruiz-Pérez, S.J. Martin, A. Cadby, A. Menelle, J.R.P. Webster, A.J. Gleeson, W. Bras

Research output: Contribution to journalArticle

Abstract

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.
LanguageEnglish
Pages55-74
Number of pages20
JournalFaraday Discussions
Volume128
Early online date14 Sep 2004
DOIs
Publication statusPublished - 2005

Fingerprint

brushes
Brushes
nanotechnology
Nanotechnology
Gels
gels
Polyelectrolytes
Block copolymers
copolymers
Molecules
Polymers
Bromates
bromates
molecules
sulfites
Sulfites
Force measurement
Hydrogel
Atom transfer radical polymerization
polymers

Keywords

  • acid
  • ferrocyanide
  • polyelectrolyte
  • polymer
  • sulfite
  • gel
  • molecular interaction
  • neutron
  • oscillation
  • thermodynamics

Cite this

Ryan, A. J., Crook, C. J., Howse, J. R., Topham, P., Jones, R. A. L., Geoghegan, M., ... Bras, W. (2005). Responsive brushes and gels as components of soft nanotechnology. Faraday Discussions, 128, 55-74. https://doi.org/10.1039/b405700g
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. / Responsive brushes and gels as components of soft nanotechnology. In: Faraday Discussions. 2005 ; Vol. 128. pp. 55-74.
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Ryan, AJ, Crook, CJ, Howse, JR, Topham, P, Jones, RAL, Geoghegan, M, Parnell, AJ, Ruiz-Pérez, L, Martin, SJ, Cadby, A, Menelle, A, Webster, JRP, Gleeson, AJ & Bras, W 2005, 'Responsive brushes and gels as components of soft nanotechnology' Faraday Discussions, vol. 128, pp. 55-74. https://doi.org/10.1039/b405700g

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 journalArticle

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

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EP - 74

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T2 - Faraday Discussions

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