Thermo-responsive diblock and triblock cationic copolymers at the silica/aqueous interface: A QCM-D and AFM study

Saeed Zajforoushan Moghaddam, Kaizheng Zhu, Bo Nyström, Esben Thormann

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Abstract

The properties of synthesized diblock poly(N-isopropylacrylamide)-poly((3-acrylamidopropyl)trimethylammonium chloride) and triblock methoxy-poly(ethylene glycol)-poly(N-isopropylacrylamide)-poly((3-acrylamidopropyl)trimethylammonium chloride) cationic copolymers at the silica/aqueous interface are investigated using quartz crystal microbalance with dissipation monitoring (QCM-D) and atomic force microscopy (AFM). Moreover, dynamic light scattering is employed to assess the copolymers in terms of the hydrodynamic size and interchain aggregation. Although viscoelastic Voigt modeling of the QCM-D data suggests a comparable layer thickness for the copolymers on the silica surface, the AFM imaging and colloidal probe measurements reveal significant differences in surface coverage and thickness of the layers, which are discussed and compared with respect to the stabilization effect by the hydrophilic poly(ethylene glycol) block.
Original languageEnglish
JournalJournal of Colloid and Interface Science
Volume505
Pages (from-to)546-555
ISSN0021-9797
DOIs
Publication statusPublished - 2017

Keywords

  • Atomic force microscopy
  • Cationic copolymer
  • Dynamic light scattering
  • Poly(ethylene glycol)
  • Poly(N-isopropylacrylamide)
  • Quartz crystal microbalance with dissipation

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