Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-01-05
Macromolecules 39, 463 (2006)
Physics
Condensed Matter
Soft Condensed Matter
18 pages, 5 figures
Scientific paper
10.1021/ma0519213
The build up of polyelectrolyte multilayers (PEMs) was observed by a silicon-on-insulator (SOI) based thin film resistor. Differently charged polyelectrolytes adsorbing to the sensor surface result in defined potential shifts, which decrease with the number of layers deposited. We model the response of the device assuming electrostatic screening of polyelectrolyte charges by mobile ions within the PEMs. The Debye screening length inside the PEMs was found to be increased compared to the value corresponding to the bulk solution. Furthermore the partitioning of mobile ions between the bulk phase and the polyelectrolyte film was employed to calculate the dielectric constant of the PEMs and the concentration of mobile charges.
Bausch Andreas R.
Ecker Christof
Klitzing Regine von
Naji Ali
Neff Petra A.
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