Thermoresponsive PEG-based polymer layers: Surface characterization with AFM force measurements
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
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 language | English |
---|---|
Pages (from-to) | 3462-3467 |
Number of pages | 6 |
Journal | Langmuir |
Volume | 26 |
Issue number | 5 |
Publication status | Published - 2 Mar 2010 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
PubMed | 19891449 |
---|