Not All Anionic Polyelectrolytes Complex with DTAB

Yuguo Cui, Robert Pelton, T Cosgrove, RM Richardson, Sheng Dai, SW Prescott, Isabelle Grillo, Howard Ketelson, David Meadows

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)

Abstract

The influence of hydroxypropyl guar (HPG), with and without boric acid, on dodecyltrimethyl ammonium bromide (DTAB) micellization was characterized by surface tension measurements, isothermal titration calorimetry, and small-angle neutron scattering. Although HPG is a nonionic water-soluble polymer, borate ions form weak bonds with HPG, transforming it into ail anionic polyelectrolyte, HPG-borate. Surprisingly, the three independent measurements showed that HPG-borate does not promote DTAB micellization or phase separation normally seen when mixing oppositely charged polyelectrolytes and surfactants. However, the neutron scattering results suggested that HPG-borate binds to and flocculates existing DTAB micelles. The unusual behavior of HPG-borate with DTAB was underscored by showing that carboxymethyl guar (CMG) formed precipitates with DTAB
Translated title of the contributionNot All Anionic Polyelectrolytes Complex with DTAB
Original languageEnglish
Pages (from-to)13712 - 13717
JournalLangmuir
Volume25
Publication statusPublished - 2009

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