Chain conformation and dynamics in spin-assisted weak polyelectrolyte multilayers

Langmuir : the ACS Journal of Surfaces and Colloids
Aliaksandr ZhukSvetlana A Sukhishvili

Abstract

We report on the effect of the deposition technique on film layering, stability, and chain mobility in weak polyelectrolyte layer-by-layer (LbL) films. Ellipsometry and neutron reflectometry (NR) showed that shear forces arising during spin-assisted assembly lead to smaller amounts of adsorbed polyelectrolytes within LbL films, result in a higher degree of internal film order, and dramatically improve stability of assemblies in salt solutions as compared to dip-assisted LbL assemblies. The underlying flattening of polyelectrolyte chains in spin-assisted LbL films was also revealed as an increase in ionization degree of the assembled weak polyelectrolytes. As demonstrated by fluorescence recovery after photobleaching (FRAP), strong binding between spin-deposited polyelectrolytes results in a significant slowdown of chain diffusion in salt solutions as compared to dip-deposited films. Moreover, salt-induced chain intermixing in the direction perpendicular to the substrate is largely inhibited in spin-deposited films, resulting in only subdiffusional (<2 Å) chain displacements even after 200 h exposure to 1 M NaCl solutions. This persistence of polyelectrolyte layering has important ramifications for multistage drug delivery and o...Continue Reading

References

Jan 11, 2005·The Journal of Chemical Physics·Denis PristinskiSvetlana A Sukhishvili
Nov 16, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Mikko SalomäkiJouko Kankare
Jan 11, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Jad A Jaber, Joseph B Schlenoff
Apr 28, 2007·The Journal of Physical Chemistry. B·P NazaranR V Klitzing
Nov 9, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Pritesh A PatelPatrick T Mather
Jun 4, 2008·Physical Review Letters·Eugenia KharlampievaSvetlana A Sukhishvili
Jun 28, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Laurent JourdainneThierry Charitat
Sep 26, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Eugenia KharlampievaSvetlana A Sukhishvili
Jul 8, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Eugenia KharlampievaVladimir V Tsukruk
Aug 27, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·John E WongRegine von Klitzing
Sep 29, 2012·ACS Macro Letters·Li XuSvetlana A Sukhishvili

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Citations

Jun 3, 2017·The Journal of Chemical Physics·Wengang ZhangFrancis W Starr
Dec 15, 2016·Chemical Reviews·Joseph J RichardsonFrank Caruso
Mar 6, 2018·ACS Applied Materials & Interfaces·Victor SelinSvetlana A Sukhishvili

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