Issue 9, 2012
From the journal:

Physical Chemistry Chemical Physics

Slow complexation dynamics between linear short polyphosphates and polyallylamines: analogies with “layer-by-layer” deposits†

Nejla Cini,a   Tulay Tulun,a   Christian Blanck,b   Valérie Toniazzo,c   David Ruch,c   Gero Decherbde  and  Vincent Ball*c  

* Corresponding authors

a Faculty of Sciences and Letters, Department of Chemistry, Technical University of Istanbul, Istanbul, Turkey

b Centre National de la Recherche Scientifique, Institut Charles Sadron, 23 rue du Loess, F-67034 Strasbourg, France

c Departement for Advanced Materials and Structures, Centre de Recherche Public Henri Tudor, 66 rue de Luxembourg, Esch-sur-Alzette, Luxembourg
E-mail: vincent.ball@tudor.lu

d International Center for Frontier Research in Chemistry, 8 allée Gaspard Monge, F-67083 Strasbourg, France

e Université de Strasbourg, Faculté de Chimie, 1 rue Blaise Pascal, Strasbourg, France

Abstract

Polyelectrolyte “complexes” have been studied for almost a century and find more and more applications in cosmetics and DNA transfection. Most of the available studies focused on the thermodynamic aspects of the “complex” formation, mainly to determine phase diagrams and the influence of diverse physicochemical aspects on the formation of “complexes”, but conversely less effort has been given to the kinetics of such processes. We describe herein the “complexation” kinetics of a short linear sodium polyphosphate (PSP) with poly(allylamine hydrochloride) (PAH) in the presence of 10 mM, 0.15 M and 1 M NaCl. We find, by using a combination of physicochemical techniques, that mixtures containing a 1 to 1 molar ratio of phosphate and amino groups allow the formation of “complexes” having a few 100 nm in diameter which progressively grow to particles up to 1.5 microns in hydrodynamic diameter, the growth process being accompanied by some progressive sedimentation. During this slow aggregation kinetics, the polyelectrolytes undergo a release of counterions and the zeta potential changes from a positive value to a negative one of −20 mV which is close to the zeta potential of (PSP–PAH)n films deposited under identical physicochemical conditions. Even though the complexes have a negative electrophoretic mobility, they contain an equimolar amount of amino and phosphate groups. This allows us to make some assumption about the structure of such “complexes” and to compare them with other published structures. We will also compare them with the aggregates found during the “layer-by-layer” deposition of the same species under the same conditions.

Graphical abstract: Slow complexation dynamics between linear short polyphosphates and polyallylamines: analogies with “layer-by-layer” deposits

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Article information

DOI
https://doi.org/10.1039/C2CP23570F
Article type
Paper
Submitted
13 Nov 2011
Accepted
15 Dec 2011
First published
21 Dec 2011

Phys. Chem. Chem. Phys., 2012,14, 3048-3056

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Slow complexation dynamics between linear short polyphosphates and polyallylamines: analogies with “layer-by-layer” deposits

N. Cini, T. Tulun, C. Blanck, V. Toniazzo, D. Ruch, G. Decher and V. Ball, Phys. Chem. Chem. Phys., 2012, 14, 3048 DOI: 10.1039/C2CP23570F

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