Salt-regulated attraction and repulsion of spherical polyelectrolyte brushes towards polyelectrolyte multilayers

Physical Chemistry Chemical Physics : PCCP
Christoph HanskeAndreas Fery

Abstract

Adsorption of colloidal particles presents an interesting alternative to the modification of surfaces using covalent coupling or physisorption of molecules. However, to tailor the properties of these materials full control over the effective particle-substrate interactions is required. We present a systematic investigation of the adsorption of spherical polyelectrolyte brushes (SPB) onto polyelectrolyte multilayers (PEM). A brush layer grafted from colloidal particles allows the incorporation of various functional moieties as well as the precise adjustment of their adsorption behaviour. In the presence of oppositely charged surfaces the amount of adsorbed SPB monotonically increases with the ionic strength, whereas equally charged substrates efficiently prevent colloidal attachment below a threshold salt concentration. We found that the transition from the osmotic to the salted brush regime at approximately 100 mM coincided with a complete loss of substrate selectivity. In this regime of high ionic strength, attractive secondary interactions become dominant over electrosteric repulsion. Due to the soft polyelectrolyte corona a surface coverage exceeding the theoretical jamming limit could be realized. Both the adsorption kineti...Continue Reading

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Citations

Dec 12, 2013·Macromolecular Rapid Communications·Claudia Simone Plüisch, Alexander Wittemann
Dec 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Shiqi Zhou
Feb 10, 2017·The Journal of Chemical Physics·Michał Cieśla, Jakub Barbasz
Feb 25, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Yicun WenMaria M Santore
Apr 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Astrid DrechslerManfred Stamm

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