+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Flocculation in mixtures of cationic polyelectrolytes and anionic surfactants



Flocculation in mixtures of cationic polyelectrolytes and anionic surfactants



Advances in Colloid and Interface Science 106: 1-22



The phase behavior of mixtures of a cationic polyelectrolyte ('Jaguar') and an anionic surfactant (either sodium dodecyl sulfate or sodium lauryl ether sulfate) has been studied. For a given polyelectrolyte (and added NaCl) concentration, with increasing surfactant concentration, three phase regions were identified. The first region is a single homogeneous phase. Within this region, at some surfactant concentration, above the critical aggregation concentration, stable open-network 'particles' form, typically approximately 100 nm in size, which are net positively charged. However, as the surfactant concentration is increased further, these particles aggregate and form a two-phase system, i.e. a separated gel phase, containing a high percentage of water, co-existing with an aqueous surfactant phase. At some higher surfactant concentration still, the particles become sufficiently negatively charged that they re-stabilize. Beyond this surfactant concentration, therefore, the system reverts to being a single, homogeneous phase. Within the two-phase (aggregated particle) region an iso-electric point for the particles has been observed at a certain surfactant concentration, by electrophoresis. Furthermore, in this aggregated, gel-phase region, there appear to be typically approximately 2-4 surfactant molecules associated with each cationic site of the polymer chains. It is postulated that association of the anionic surfactant molecules occurs within the polyelectrolyte chains, binding them together, to form the particles referred to. These associated surfactant structures have been referred to here as 'internal' micelles. A crude estimate has been made, based on turbidity/time measurements, that there may be up to approximately 1000 polymer chains in each primary particle, bound together by the internal surfactant micelles. Small-angle light scattering studies of the aggregating particles indicate a fractal dimension for the aggregates, which would correspond to a diffusion-limited aggregation process.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 049091654

Download citation: RISBibTeXText

PMID: 14672840

DOI: 10.1016/s0001-8686(03)00103-9


Related references

Effect of mixing on the formation of complexes of hyperbranched cationic polyelectrolytes and anionic surfactants. Langmuir 23(8): 4237-4247, 2007

Critical aggregation concentration in mixed solutions of anionic polyelectrolytes and cationic surfactants. Langmuir 20(20): 8496-8503, 2004

Structure and dynamics of aqueous mixtures of an anionic cellulose derivative and anionic or cationic surfactants. Colloids and Surfaces A: Physicochemical and Engineering Aspects 279(1-3): 40-49, 2006

Aggregates of cationic surfactants and anionic polyelectrolytes influenced by bulky head group modifications. Colloids and Surfaces A: Physicochemical and Engineering Aspects 224(1-3): 185-197, 2003

Phase behavior in mixtures of cationic surfactant and anionic polyelectrolytes. Colloids and Surfaces A: Physicochemical and Engineering Aspects 255(1-3): 181-191, 2005

Complexes between high charge density cationic polyelectrolytes and anionic single- and double-tail surfactants. Journal of Physical Chemistry. B 113(20): 7064-7070, 2009

Triphenyl- and tributyl-phosphonium head groups contributions in mixed cationic surfactants and anionic polyelectrolytes aggregates. Colloids and Surfaces A: Physicochemical and Engineering Aspects 227(1-3): 9-19, 2003

Solubilization capabilities of mixtures of cationic Gemini surfactant with conventional cationic, nonionic and anionic surfactants towards polycyclic aromatic hydrocarbons. Journal of Hazardous Materials 167(1-3): 575-581, 2009

The importance of adsorbed cationic surfactant structure in dictating the subsequent interaction of anionic surfactants and polyelectrolytes with pigment surfaces. Colloids and Surfaces A: Physicochemical and Engineering Aspects 203(1-3): 21-36, 2002

Surface deposition and phase behavior of oppositely charged polyion/surfactant ion complexes. 1. Cationic guar versus cationic hydroxyethylcellulose in mixtures with anionic surfactants. Acs Applied Materials and Interfaces 1(11): 2431-2442, 2009

Mixtures of cationic starch and anionic polyacrylate used for flocculation of calcium carbonateinfluence of electrolytes. Colloids and Surfaces A: Physicochemical and Engineering Aspects 234(1-3): 85-93, 2004

Phase Behavior in Mixtures of Cationic Dimeric and Anionic Monomeric Surfactants. Journal of Dispersion Science and Technology 30(5): 622-633, 2009

Formation of monodisperse charged vesicles in mixtures of cationic gemini surfactants and anionic SDS. Langmuir 27(2): 582-591, 2011

A study of anionic dyecationic surfactant interactions in mixtures of cationic and nonionic surfactants. Dyes and Pigments 54(3): 221-237, 2002

Spectrophotometric determination of cationic and anionic surfactants with anionic dyes in the presence of nonionic surfactants, part I: A general aspect. Microchimica Acta 106(1-2): 57-66, 1992