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    Explanation for the Apparent Absence of Collapse of Polyelectrolyte Brushes in the Presence of Bulky Ions

    Year: 2007

    Journal: J Phys Chem B. 2007 Jun 28;111(25):7034-7040, 20100827

    Authors: Moya SE, Azzaroni O, Kelby T, Donath E, Huck WT

    Last authors: Huck WT

    Organizations: The Nanoscience Centre, University of Cambridge, 11 J. J. Thomson Avenue, Cambridge, CB3 0FF, United Kingdom, Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom, CIC Biomagune, Paseo Miramón 182 C, 20009 San SebastiAn, Gipuzkoa, Spain, and Institute of Medical Physics and Biophysics, Leipzig University, Härtelstrasse 16/18, D-04107 Leipzig, Germany

    Country: Germany

    The conformational behavior of poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMETAC) brushes with different chain density in the presence of large benzyltributylammonium chloride (BTBAC) ions has been studied by a Quartz Crystal Microbalance with Dissipation (QCM-D) and Scanning Force Microscopy. Dense brushes do not collapse in the presence of BTBAC solutions of increasing ionic strength, contrary to what is observed in the presence of NaCl. Brush collapse can be observed for low-ionic-strength solutions of BTBAC when the brush density has been reduced. These phenomena can be explained by considering the Hofmeister series as well as ion size and free space in the brush.