- Title
- Oscillatory packing and depletion of polyelectrolyte molecules at an oxide water interface
- Creator
- Biggs, Simon; Dagastine, Raymond R.; Prieve, Dennis C.
- Relation
- Journal of Physical Chemistry B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical Vol. 106, Issue 44, p. 11557-11564
- Publisher Link
- http://dx.doi.org/10.1021/jp026425k
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2002
- Description
- Total internal reflection microscopy (TIRM) has been used to study the interactions between a 5 μm borosilicate glass sphere and a silica slide in the presence of a nonadsorbing polyelectrolyte, sodium (polystyrene sulfonate) (NaPSS). The effect of the polymer concentration, within the dilute solution regime, on the observed interactions was investigated. In all cases, the interactions displayed a short-range electrostatic repulsion followed immediately, at larger separations, by a decaying oscillatory interaction that is attributed to structuring of the polyelectrolyte in solution. The periodicity of the oscillations, as a function of concentration, indicates that at large surface separations the polymer chains are ordered as a nonintermixing, space-filling, latex. At polymer concentrations of between 200 and 1000 ppm, a transition to a system of ordered rods, parallel to the interface was seen for the final layer of polymer molecules.
- Subject
- otal internal reflection microscopy; electrostatic repulsion; polymer molecules; polyelectrolyte; oscillatory interaction
- Identifier
- http://hdl.handle.net/1959.13/33341
- Identifier
- uon:3208
- Identifier
- ISSN:1520-6106
- Language
- eng
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