Detachment of a single polyelectrolyte chain adsorbed on a charged surface
Institut Charles Sadron (CNRS UPR 22), 6 rue Boussingault,
67083 Strasbourg Cedex, France
Accepted: 4 December 1997
We study both experimentally, with an atomic force microscope (AFM), and theoretically, using scaling arguments, the stretching of a single polyelectrolyte chain adsorbed at a planar charged surface. The main result is that the force needed to pull a monomer of the chain at a distance z from the surface reaches a plateau at distances larger than the Debye screening length of the solution.
PACS: 68.45.-v – Solid-fluid interfaces / 82.65.Dp – Thermodynamics of surfaces and interfaces / 82.70.Dd – Colloids
© EDP Sciences, 1998