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Modeling of Bottle-Brush Polymer Adsorption onto Mica and Silica Surfaces
KTH, Skolan för kemivetenskap (CHE), Kemi, Fysikalisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
2009 (Engelska)Ingår i: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 42, nr 16, s. 6310-6318Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The adsorption of a series of charged bottle-brush polymers with side chains of constant length 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 at X approximate to 50 for the mica surface and at X approximate to 10 for the silica surface. Moreover, the thickest adsorbed layer is obtained at X = 10-25.

Ort, förlag, år, upplaga, sidor
2009. Vol. 42, nr 16, s. 6310-6318
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URN: urn:nbn:se:kth:diva-18693DOI: 10.1021/ma900896yISI: 000269043200056Scopus ID: 2-s2.0-68949188136OAI: oai:DiVA.org:kth-18693DiVA, id: diva2:336740
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QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Linse, PerClaesson, Per M.
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