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Polyelectrolyte brushes: Water Content, Zeta Potential and Mechanical Properties

Published online by Cambridge University Press:  15 May 2015

Joseba Irigoyen ,
Jagoba Iturri ,
José Luis Camacho ,
Edwin Donath  and
Sergio Moya
Joseba Irigoyen
Affiliation:
CIC biomaGune, Paseo Miramón 182 C, 20009, San Sebastián, Spain. Tel:+34 943 00 53 11 ; E-mail: [email protected]
Jagoba Iturri
Affiliation:
CIC biomaGune, Paseo Miramón 182 C, 20009, San Sebastián, Spain. Tel:+34 943 00 53 11 ; E-mail: [email protected]
José Luis Camacho
Affiliation:
Institute of Medical Physics and Biophysics, Leipzig University, Härtelstrasse 16-18, D-04107, Leipzig, Germany
Edwin Donath
Affiliation:
Institute of Medical Physics and Biophysics, Leipzig University, Härtelstrasse 16-18, D-04107, Leipzig, Germany
Sergio Moya*
Affiliation:
CIC biomaGune, Paseo Miramón 182 C, 20009, San Sebastián, Spain. Tel:+34 943 00 53 11 ; E-mail: [email protected]
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Abstract

Polymer brushes of poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride (PMETAC) and poly(sulfo propyl methacrylate) (PSPM) were synthesized by Atomic Transfer Radical Polymerization from planar and colloidal surfaces. Polymer brush growth was followed by QCMD and the water content determined by combined QCMD and elipsometry. From the water content the percentage of water lost during the brush collapse with the ionic strength could be obtained.

Highly charged PSPM brushes were indented by Atomic Force Microscopy at different ionic strengths. The force response was fitted to a phenomenological equation analogous to the equation of state of a compressible fluid. Internal energy and brush compressibility were obtained as a function of ionic strength.

Spherical brushes of PMETAC and PSPM display an invariance of the zeta potential with ionic strength in the range from 20 mM to 200 mM NaCl, the zeta potential remains almost constant. This invariance can be explained applying a hairy surface approach.

Keywords

polymersurface chemistrynanoscale
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1754: Symposium OO/PP/QQ/TT – State-of-the-Art Developments in Materials Characterization , 2015 , pp. 53 - 58
Copyright
Copyright © Materials Research Society 2015 

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References

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