Differences between tethered polyelectrolyte chains on bare mica and hydrophobically modified mica

Langmuir : the ACS Journal of Surfaces and Colloids
Feng LiMatthew Tirrell

Abstract

This study investigates the structures of layers of amphiphilic diblock copolymers of poly(t-butyl styrene)-poly(styrene sulfonate) (PtBS-PSS) adsorbed on both the bare mica surface (hydrophilic) and an octadecyltriethoxysilane (OTE)-modified mica surface (hydrophobic). When the surface is rendered hydrophobic, the nonsoluble block exhibits stronger interaction with the surface and higher adsorbed masses are achieved. Interaction forces between two such adsorbed layers on both substrates were measured using the surface forces apparatus. The effect of salt concentration (Cs) and molecular weight (N) on the height of the self-assembled layers (L0) was examined in each case. The resulting scaling relationship is in good agreement with predictions of the brush model, L0 proportional to N(1.0) in the low-salt limit and L0N(-1) proportional to (Cs/sigma)(-0.32) in the salted regime, when adsorption takes place onto the hydrophobized mica surface. For adsorption on the bare mica surface, L0N(-0.7) proportional, variant Cs(-0.17) agrees with the scaling prediction of the sparse tethering model. The results suggest that, on the hydrophilic bare mica surface, the adsorbed amount is not high enough to form a brush structure and only very ...Continue Reading

References

Oct 9, 1995·Physical Review Letters·Y MirL Auvray
Feb 22, 1991·Science·S T Milner

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Citations

Apr 9, 2008·Annual Review of Physical Chemistry·Ryan Toomey, Matthew Tirrell
May 20, 2011·The Journal of Physical Chemistry. B·Stephan Block, Christiane A Helm
Jun 12, 2008·The Journal of Physical Chemistry. B·Tao Jiang, Jianzhong Wu
Jan 30, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Benoît Liberelle, Suzanne Giasson
Feb 25, 2009·The Journal of Physical Chemistry. B·Iain E DunlopJacob Klein
Feb 27, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Rong DongChristopher K Ober

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