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Magnetic-resonance evaluation of the suitability of microstructured polymer optical fibres as sensors for ionic aqueous solutions

Cox, Felicity M., Momot, Konstantin I., & Kuchel, Philip W. (2009) Magnetic-resonance evaluation of the suitability of microstructured polymer optical fibres as sensors for ionic aqueous solutions. Applied Materials and Interfaces, 1(1), pp. 197-203.

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Abstract

Nuclear Magnetic Resonance was used to probe the distribution of water and ionic species in a microstructured poly(methyl methacrylate) (PMMA) polymer optical fibre (MPOF), with a view to assessing the suitability of these fibres for aqueous chemosensing. The NMR spectra and the measurements of proton spin relaxation in hydrated fibres demonstrated the presence of two distinct pools of water: water residing in the microstructure channels and the hydration water residing in the polymer matrix of the fibre. No facile chemical exchange between these two pools was present. The NMR peaks of the two pools of water were separated by 1.53 ppm. Relaxation measurements of the fibre samples doped with aqueous copper sulfate showed that charged ions freely entered the microstructure channels but were completely excluded from the polymer matrix of the fibre. Measurements of the apparent diffusion coefficient of water along the axial direction of the fibre showed that water molecules moved unimpeded along the channels. This is the first reported magnetic-resonance study of microstructured optical fibres. The findings suggest that microstructured PMMA fibres are compatible with ionic aqueous solutions and could provide a robust and durable platform for chemical-sensing applications.

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ID Code: 18545
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Keywords: polymer optical fibres, fibre optics sensors, NMR characterisation of materials, paramagnetic relaxation, PGSE diffusion NMR, hydrated PMMA
DOI: 10.1021/am800059c
ISSN: 1944-8244
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500) > Photonics Optoelectronics and Optical Communications (020504)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Physical Chemistry not elsewhere classified (030699)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > School of Physical & Chemical Sciences
Copyright Owner: Copyright 2009 American Chemical Society
Deposited On: 10 Mar 2009 09:07
Last Modified: 01 Mar 2012 00:09

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