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Modeling of bottle-brush polymer adsorption onto mica and silica surfaces
YKI – Ytkemiska institutet.
2009 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 42, no 16, p. 6310-6318Article in journal (Refereed)
Abstract [en]

The adsorption of a series of charged bottle-brush polymers with side chains of constantlength on mica and silica surfaces is modeled using a lattice mean-field theory, and the predicted results are compared to corresponding experimental data. The bottle-brush polymers are modeled as being composed of two types of main-chain segments: charged segments and uncharged segments with an attached side chain. The composition variable X denotes the percentage of charged main-chain segments and ranges from X=0 (uncharged bottle-brush polymer) to X=100 (linear polyelectrolyte). The mica-like surface possesses a constant negative surface charge density and no special affinity, whereas the silica-like surface has a constant negative surface potential and a positive affinity for the side chains of the bottle-brush polymers. The model is able to reproduce a number of salient experimental features characterizing the adsorption of the bottle-brush polymers for the full range of the composition variable X on the two surfaces, and thereby quantifying the different nature of the two surfaces with respect to electrostatic properties and nonelectrostatic affinity for the polymer. In particular, the surface excess displays a maximum atX≈50 for the mica surface and at X≈10 for the silica surface. Moreover, the thickest adsorbed layer is obtained at X=10-25.

Place, publisher, year, edition, pages
2009. Vol. 42, no 16, p. 6310-6318
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27304DOI: 10.1021/ma900896yOAI: oai:DiVA.org:ri-27304DiVA: diva2:1054308
Note
A2016Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2017-11-29Bibliographically approved

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