On the stability of the polymer brushes formed by adsorption of Ionomer Complexes on hydrophilic and hydrophobic surfaces

A. M. Brzozowska*, E. Spruijt, A. de Keizer, M. A. Cohen Stuart, W. Norde

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

We have studied the effect of normal forces and shear forces on the stability and functionality of a polymer brush layer formed upon adsorption of polymeric micelles on hydrophilic and hydrophobic surfaces. The micelles consist of oppositely charged polyelectrolyte blocks (poly(acrylic acid) and poly(N-methyl 2-vinyl pyridinium iodide), and a neutral block (poly(vinyl alcohol)) or neutral grafts (poly(ethylene oxide)). The strength of the attachment of the micellar layers to various substrates was evaluated with Atomic Force Microscopy. Flow cell experiments allowed for the evaluation of long-term stability of coatings in lateral flow. Fixed angle optical reflectometry was used to quantify protein (BSA) adsorption on the micellar layers after their exposure to flow. The results show that adsorbed micellar layers are relatively weakly attached to hydrophobic surfaces and much stronger to hydrophilic surfaces, which has a significant impact on their stability. Adsorbed layers maintain their ability to suppress protein adsorption on hydrophilic surfaces but not on hydrophobic surfaces. Due to the relatively weak attachment to hydrophobic surfaces the structure of adsorbed layers may easily be disrupted by lateral forces, such that the complex coacervate-brush structure no longer exists. (C) 2010 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)380-391
Number of pages12
JournalJournal of Colloid and Interface Science
Volume353
Issue number2
DOIs
Publication statusPublished - 15-Jan-2011

Keywords

  • Ionomer Complexes
  • Complex Coacervate Core Micelles
  • Grafted Ionomer Complexes
  • Adsorption
  • Shear
  • Silica
  • Polystyrene
  • Polysulfone
  • COACERVATION CORE MICELLES
  • ATOMIC-FORCE MICROSCOPE
  • POLY(VINYL ALCOHOL)
  • PROTEIN ADSORPTION
  • POLYELECTROLYTE BRUSHES
  • POLYSTYRENE SURFACES
  • MEMBRANE SYSTEMS
  • STRONG SHEAR
  • REDUCTION
  • SILICA

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