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

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Stefanie Kessel - , Max Planck Institute of Colloids and Interfaces, Universität Bayreuth (Autor:in)
  • Stephan Schmidt - , Universität Bayreuth (Autor:in)
  • Renate Müller - , Max Planck Institute of Colloids and Interfaces, Universität Bayreuth (Autor:in)
  • Erik Wischerhoff - , Fraunhofer-Institut für Angewandte Polymerforschung (Autor:in)
  • André Laschewsky - , Fraunhofer-Institut für Angewandte Polymerforschung, Universität Potsdam (Autor:in)
  • Jean François Lutz - , Fraunhofer-Institut für Angewandte Polymerforschung (Autor:in)
  • Katja Uhlig - , Fraunhofer-Institut für Biomedizinische Technik (Autor:in)
  • Andreas Lankenau - , Fraunhofer-Institut für Biomedizinische Technik (Autor:in)
  • Claus Duschl - , Fraunhofer-Institut für Biomedizinische Technik (Autor:in)
  • Andreas Fery - , Max Planck Institute of Colloids and Interfaces, Universität Bayreuth (Autor:in)

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

OriginalspracheEnglisch
Seiten (von - bis)3462-3467
Seitenumfang6
FachzeitschriftLangmuir
Jahrgang26
Ausgabenummer5
PublikationsstatusVeröffentlicht - 2 März 2010
Peer-Review-StatusJa
Extern publiziertJa

Externe IDs

PubMed 19891449