Thermoresponsive PEG-based polymer layers: Surface characterization with AFM force measurements

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Stefanie Kessel - , Max Planck Institute of Colloids and Interfaces, University of Bayreuth (Author)
  • Stephan Schmidt - , University of Bayreuth (Author)
  • Renate Müller - , Max Planck Institute of Colloids and Interfaces, University of Bayreuth (Author)
  • Erik Wischerhoff - , Fraunhofer Institute for Applied Polymer Research (Author)
  • André Laschewsky - , Fraunhofer Institute for Applied Polymer Research, University of Potsdam (Author)
  • Jean François Lutz - , Fraunhofer Institute for Applied Polymer Research (Author)
  • Katja Uhlig - , Fraunhofer Institute for Biomedical Engineering (Author)
  • Andreas Lankenau - , Fraunhofer Institute for Biomedical Engineering (Author)
  • Claus Duschl - , Fraunhofer Institute for Biomedical Engineering (Author)
  • Andreas Fery - , Max Planck Institute of Colloids and Interfaces, University of Bayreuth (Author)

Abstract

Thermoresponsive polymer-coated surfaces based on poly(2-(2-methoxyethoxy) ethyl methacrylate-co-oligo(ethylene glycol) methacrylate) [P(ME0 2MA-co-OEGMA)] allow switching between cell attachment and detachment. Here, we investigate the temperature-dependent surface interactions between the polymer coating and a colloidal probe in an aqueous medium, by means of atomic force microscopy (AFM) force-distance measurements. The analysis of the adhesion forces from AFM. retraction curves indentifies two kinds of regimes for the copolymer at temperatures below and above the lower critical solution temperature (LCST). Whereas at 25 °C the surface interactions with the polymer in the swollen state are dominated by repulsive forces, at 37 °C the surface interactions switch to attractive forces and a stronger adhesion is detected by AFM. Running several heating/cooling cycles repeatedly shows that switching the surface properties provides reproducible adhesion force values. Time-dependent measurements give insight into the switching kinetics, demonstrating that the cell response is coupled to the polymer kinetics but probably limited by the cellular rearrangements.

Details

Original languageEnglish
Pages (from-to)3462-3467
Number of pages6
JournalLangmuir
Volume26
Issue number5
Publication statusPublished - 2 Mar 2010
Peer-reviewedYes
Externally publishedYes

External IDs

PubMed 19891449