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Sensing surface PEGylation with microcantilevers.

Natalija Backmann¹, Natascha Kappeler, Thomas Braun

¹National Centre of Competence in Research in Nanoscale Science, Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland.

Beilstein Journal of Nanotechnology

|October 7, 2011

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This study developed a microcantilever sensor to analyze polyethylene glycol (PEG) coatings on gold surfaces. The sensor successfully monitored PEG layer formation and conformational changes in different solvents.

Area of Science:

Surface Science
Polymer Chemistry
Materials Science

Background:

Polymers modify surface properties for applications in tribology, colloidal stability, and medicine.
Polyethylene glycol (PEG) is a protein-resistant coating known for low toxicity and biocompatibility.
Controlling polymer conformation is key to tailoring surface functionalities.

Purpose of the Study:

To develop a microcantilever-based sensor for in situ characterization of PEG monolayer formation on gold.
To monitor conformational changes of grafted PEG layers under varying solvent conditions.
To investigate the reversible collapse of PEG in response to solvent quality.

Main Methods:

Utilizing a microcantilever sensor for real-time analysis of PEG grafting.

Keywords:

AFM cantilever sensor polyethylene glycol polymer brush reversible collapse static mode

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Employing the "grafting to" approach for PEG monolayer formation on gold surfaces.

Complementary characterization using Atomic Force Microscopy (AFM) and force-distance curves.

Main Results:

Successful in situ characterization of PEG monolayer formation on gold.
Demonstrated the ability of microcantilevers to monitor PEG conformational transitions.
Observed reversible PEG collapse in poor solvent conditions, confirmed by AFM.

Conclusions:

Microcantilever sensors are effective tools for characterizing polymer interfaces.
PEG layers exhibit solvent-dependent conformational changes, crucial for surface property control.
This technique offers insights into polymer behavior at interfaces for diverse applications.