Issue 4, 2010
From the journal:

Soft Matter

Quantifying hydrogel response using laser light scattering†‡

Joshua M. G. Swann,a   Wim Bras,b   Jonathan R. Howse,*c   Paul D. Topham*d  and  Anthony J. Ryana  

* Corresponding authors

a Department of Chemistry, University Of Sheffield, Sheffield, UK

b Netherlands Organisation for Scientific Research, DUBBLE, ESRF, 6 rue Jules Horowitz, BP 220, Grenoble Cédex 9, France

c Department of Chemical and Process Engineering, University of Sheffield, Sheffield, UK
E-mail: j.r.howse@shef.ac.uk

d Chemical Engineering and Applied Chemistry, Aston University, Birmingham, UK
E-mail: p.d.topham@aston.ac.uk

Abstract

The pH and counter-ion response of a microphase separated poly(methyl methacrylate)-block-poly(2-(diethylamino)ethyl methacrylate)-block-poly(methyl methacrylate) hydrogel has been investigated using laser light scattering on an imprinted micron scale topography. A quartz diffraction grating was used to create a micron-sized periodic structure on the surface of a thin film of the polymer and the resulting diffraction pattern used to calculate the swelling ratio of the polymer film in situ. A potentiometric titration and a sequence of counter ion species, taken from the Hofmeister series, have been used to compare the results obtained using this novel technique against small angle X-ray scattering (nanoscopic) and gravimetric studies of bulk gel pieces (macroscopic). For the first time, the technique has been proven to be an inexpensive and effective analytical tool for measuring hydrogel response on the microscopic scale.

Graphical abstract: Quantifying hydrogel response using laser light scattering

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Article information

DOI
https://doi.org/10.1039/B918249G
Article type
Paper
Submitted
03 Sep 2009
Accepted
27 Oct 2009
First published
17 Nov 2009

Soft Matter, 2010,6, 743-749

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Quantifying hydrogel response using laser light scattering

J. M. G. Swann, W. Bras, J. R. Howse, P. D. Topham and A. J. Ryan, Soft Matter, 2010, 6, 743 DOI: 10.1039/B918249G

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