Effects of charge ratios of xylan-poly(allylamine hydrochloride) complexes on their adsorption onto different surfaces

María Verónica Galván, María Soledad Peresin (Corresponding Author), Paulina Mocchiutti, Niko Granqvist, Miguel Ángel Zanuttini, Tekla Tammelin

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)


    The adsorption behavior of polyelectrolyte complexes (PECs) of poly(allylamine hydrochloride) (PAH) and 4-O-methylglucuronoxylan (Xyl) onto silica surface, cellulose nanofibrils (CNFs) model surfaces, and unbleached softwood kraft fibers was studied. Different charge ratios and ionic strengths of the liquid medium (q - /q +: 0.3, 0.5 and 0.8 in 1 mM NaCl, and q - /q +: 0.2, 0.3 and 0.5 in 10 mM NaCl), at pH 7.5 were considered. First, the complexes obtained were characterized by measuring the charge density, the particle size and the zeta potential. Then, the adsorption of PAH alone and PECs on silica and CNF model surfaces were studied by quartz crystal microbalance with dissipation monitoring (QCM-D) and surface plasmon resonance (SPR). The QCM-D test indicated that: (a) adsorbed cationic layers of PECs were soft in 10 mM NaCl, (b) higher adsorption was observed at higher ionic strength and (c) the highest adsorption of complex and coupled water was found at a charge ratio of 0.3. The SPR results analyzed together with the corresponding QCM-D results revealed that a significant portion of the adsorbed layers corresponded to coupled water on the cationic PEC structures. Morphology and structures of the adsorbed PEC layers studied using atomic force microscopy showed that the majority of the PECs were spherical, while some bigger aggregates were also found. Finally, the retention of different PECs on an unbleached softwood pulp was determined and the maximum retention was obtained when the PEC charge ratio was 0.5 in a 10 mM NaCl solution.
    Original languageEnglish
    Pages (from-to)2955-2970
    Issue number5
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed


    • Ionic strength
    • Cellulose nanofibrils
    • Unbleached cellulosic fibers
    • QCM-D
    • SPR


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