Flavin, K. and Mullowney, J. and Murphy, B. and Owens, E. and Kirwan, P. and Murphy, K. and Hughes, H. and McLoughlin, P. (2007) The development of novel organically modified sol-gel media for use with ATR/FTIR sensing. Analyst, 132 (3). pp. 224-229. ISSN 0003-2654
Full text not available from this repository. (Request a copy)Abstract
The ability to prepare and develop novel pre-concentration media by the sol-gel process, and their integration with mid-infrared transparent waveguides has been demonstrated. This research approach resulted in a mid-infrared sensing methodology in which the properties (porosity, functionality, polarity, etc.) of the recognition layer could be tailored by variation of the sol-gel precursors and processing conditions. Cross-linker type and concentration notably influenced p-xylene absorption and diffusion rate. Unreacted silanol groups appeared to be the dominant factor in the hydrophobicity of sol-gel layers. Variation of sol-gel precursors and thermal treatment altered both film cross-link density and polarity, as demonstrated by variation in the rate of analyte diffusion and equilibrium analyte concentration. The use of a novel 1: 1 PTMOS: DPDMS material as pre-concentration medium in this analytical sensing approach was validated through the determination of p-nitrochlorobenzene in an aqueous environment. The response demonstrated linearity between 0-30 mg L -1 with a correlation coefficient of 0.989 and a limit of detection of 0.7 mg L-1. Sensing times for p-nitrochlorobenzene were also reduced from several hours to 24 minutes, without loss of measurement accuracy or sensitivity, by a 10°C increase in the sensing temperature and the use of a predictive Fickian model previously developed by this research group.
Item Type: | Article |
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Uncontrolled Keywords: | /dk/atira/pure/subjectarea/asjc/1600/1602 |
Departments or Groups: | |
Depositing User: | Admin SSL |
Date Deposited: | 19 Oct 2022 23:01 |
Last Modified: | 31 Jul 2023 16:05 |
URI: | http://repository-testing.wit.ie/id/eprint/3648 |
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