Reswelling of polyelectrolyte hydrogels by oppositely charged surfactants. 2005

Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, S-22200 Lund, Sweden. Iseult.Lynch@fkem1.lu.se

The interactions between charged alkylacrylamide gels of varying hydrophobicity and charge density and the oppositely charged surfactant hexadecyltrimethylammonium (C16TA+) have been investigated to determine the conditions necessary to induce excess surfactant binding (beyond charge neutralization) and resolubilization of the polymer-surfactant complex. In all cases, an initial gel collapse occurred due to neutralization of the charges in the gel, and the volume of the collapsed gel was smaller than that of the corresponding neutral gel at the same surfactant concentration, as a result of the formation of interchain micellar cross-links. For gels containing neutral repeating units that were found previously to bind C16TA+, a subsequent sharp reswelling of the gel network occurred, beginning at a critical surfactant concentration called the cac(2). The reswelling is due to binding of excess surfactant, which results in the gels becoming recharged. For gels whose neutral repeating units do not bind C16TA+, there was no reswelling behavior (no cac(2)), but there was a gradual increase of the swelling back to that of the equivalent neutral gel with increasing surfactant concentration. The results are interpreted in terms of the expected surfactant binding isotherm.

UI MeSH Term Description Entries

Related Publications

Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
January 2018, Journal of materials chemistry. B,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
May 2011, Physical chemistry chemical physics : PCCP,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
October 2007, Physical review. E, Statistical, nonlinear, and soft matter physics,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
June 2004, Langmuir : the ACS journal of surfaces and colloids,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
March 2007, Langmuir : the ACS journal of surfaces and colloids,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
June 2008, Langmuir : the ACS journal of surfaces and colloids,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
April 2023, Langmuir : the ACS journal of surfaces and colloids,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
November 2011, The Journal of chemical physics,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
March 2017, The journal of physical chemistry. B,
Iseult Lynch, and Jesper Sjöström, and Lennart Piculell
April 2016, Physical chemistry chemical physics : PCCP,
Copied contents to your clipboard!