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    Responsive Polyelectrolyte Multilayers Assembled at High Ionic Strength with an Unusual Collapse at Low Ionic Strength

    Year: 2012

    Journal: Macromolecular Rapid Communications Volume 33, Issue 22, pages 1964–1969, November 23, 2012, 20130119

    Authors: Joseba Irigoyen 1, Lulu Han 2, Irantzu Llarena 1, Zhenwei Mao 2, Changyou Gao 2, Sergio E. Moya 1 2 *

    Last authors: Sergio E. Moya

    Organizations: 1
 CIC biomaGUNE, Paseo Miramón 182 C, 20009 San Sebastián, Spain 2
 Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China Email: Sergio E. Moya (smoya@cicbiomagune.es) *CIC biomaGUNE, Paseo Miramón 182 C, 20009 San Sebastián, Spain.

    Country: Spain, China

    Responsive polyelectrolyte multilayers (PEMs) of poly(diallyl dimethyl ammonium chloride) (PDADMAC) and poly(styrene sodium sulfonate) (PSS) with thicknesses between 350 and 400 nm for 11 deposited polyelectrolyte layers were fabricated assembling the polyelectrolytes at 3 m NaCl. When the 3 m NaCl bulk solution is replaced by water, the PEMs release water, approximately a 46% of the total mass, and experience a thickness reduction of more than 200 nm. Changes in thickness and water content are fully reversible. The film recovers its original thickness and water content when it is exposed again to a 3 m NaCl solution. A responsive polymer film is achieved with the capability of swelling at high ionic strength and collapsing in water with variations in thickness of hundred of nanometers.