Freestanding polyelectrolyte films as sensors for osmotic pressure

Titelangaben

Nolte, Marc ; Dönch, Ingo ; Fery, Andreas:
Freestanding polyelectrolyte films as sensors for osmotic pressure.
In: ChemPhysChem. Bd. 7 (2006) Heft 9 . - S. 1985-1989.
ISSN 1439-4235
DOI: https://doi.org/10.1002/cphc.200600300

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Abstract

Freestanding ultrathin polyelectrolyte-multilayer membranes, transferred to topographically structured polydimethylsiloxane (PDMS), are used as mechanical sensors. Due to the membranes' semipermeability, high-molecular-weight molecules can be either entrapped inside them or excluded, thus generating an osmotic pressure. This leads to a deformation. We investigate the deformotion as a function of the osmotic pressure and present an analytical theory that fully describes the data. Thus, osmotic pressures con be determined quantitatively. The individual osmotic-sensitive elements have only microscopic dimensions, and arrays con be easily produced.