Asymmetric Growth in Polyelectrolyte Multilayers.
Radioactive counterions were used to track the ratio of positive to negative polymer repeat units within a polyelectrolyte multilayer made from poly(diallyldimethylammonium chloride), PDADMAC, and poly(styrene sulfonate), PSS. For this widely employed pair of "linearly" assembled polyelectrolytes it...
| Publicado en: | Journal of the American Chemical Society Vol. 135; no. 20; pp. 7636 - 7647 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Chemical Society
5/22/2013
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=87965049&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 87965049 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 5/22/2013 vid: 135 iid: 20 pid: 997 pub: American Chemical Society artinfo: ui: 87965049 10.1021/ja401318m ppf: 7636 ppct: 11 formats: tig: atl: Asymmetric Growth in Polyelectrolyte Multilayers. aug: au: Ghostine, Ramy A. Markarian, Marie Z. Schlenoff, Joseph B. affil: Department of Chemistry and Biochemistry, The Florida State University, Tallahassee, Florida 32306-4390, United States su: Polyelectrolytes Multilayers Polystyrene Sulfonates Reaction-diffusion equations Stoichiometry Cations Chlorides sug: subj: Polyelectrolytes Multilayers Polystyrene Sulfonates Reaction-diffusion equations Stoichiometry Cations Chlorides ab: Radioactive counterions were used to track the ratio of positive to negative polymer repeat units within a polyelectrolyte multilayer made from poly(diallyldimethylammonium chloride), PDADMAC, and poly(styrene sulfonate), PSS. For this widely employed pair of "linearly" assembled polyelectrolytes it was found that the accepted model of charge overcompensation for each layer is incorrect. In fact, overcompensation at the surface occurs only on the addition of the polycation, whereas PSS merely compensates the PDADMAC. After the assembly of about a dozen layers, excess positive sites begin to accrue in the multilayer. Treating the surface as a reaction–diffusion region for pairing of polymer charges, a model profile was constructed. It is shown that different reaction–diffusion ranges of positive and negative polyelectrolyte charge lead to a blanket of glassy, stoichiometric complex growing on top of a layer of rubbery, PDADMAC-rich complex. Though overcompensation and growth was highly asymmetric with respect to the layer number, entirely conventional "linear" assembly of the multilayer was observed. The impact of asymmetric growth on various properties of multilayers is discussed. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2013 holdings: @attributes: islocal: N |
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