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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Myers, Matt
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2017The Effect of Pressure and Temperature on Mid-Infrared Sensing of Dissolved Hydrocarbons in Watercitations
- 2017Calixarene-Polymer Hybrid Film for the Selective Detection of Hydrocarbons in Watercitations
- 2014A mid-infrared sensor for the determination of perfluorocarbon-based compounds in aquatic systems for geosequestration purposescitations
- 2013Direct quantification of aromatic hydrocarbons in geochemical fluids with a mid-infrared attenuated total reflection sensorcitations
- 2012Using Plasticizers to Control the Hydrocarbon Selectivity of a Poly(Methyl Methacrylate)-Coated Quartz Crystal Microbalance Sensorcitations
- 2010The Effect of Water Uptake on the Response of a Polymer Based QCM Sensor for Hydrocarbons
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article
Using Plasticizers to Control the Hydrocarbon Selectivity of a Poly(Methyl Methacrylate)-Coated Quartz Crystal Microbalance Sensor
Abstract
Chemical sensors based on a polymer coated quartz crystal microbalance (QCM) generally present poor molecular selectivity for compounds containing similar functional groups and possess the same chemical properties. This paper shows for the first time that the sensitivity and selectivity of a glassy polymer membrane with low absorption properties for volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAH) can be modified by using plasticizers. The sensor was fabricated by spin coating poly(methyl methacrylate) (PMMA) onto a quartz crystal and the influence of plasticizer type and amount on the response was evaluated. It was shown that the hydrocarbon sensitivity of plasticizer free PMMA membrane is negligible, while the sensitivity of plasticized PMMA was similar to or in some cases greater when compared to highly responsive rubbery polymers (e.g. polyisobutylene, PIB).At a certain plasticizer content, the plasticizer-PMMA membrane was found to be much more selective for ethylbenzene and p-xylene over naphthalene compared to a PIB membrane (e.g. the sensitivity was about 2 times higher for ethylbenzene and p-xylene on PMMA doped with 10% w/w di(2-ethylhexyl) sebacate as compared to PIB which was more sensitive to naphthalene). Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) measurements were performed to understand the mechanism of sorption, and these studies confirmed that the presence of a plasticizer increases the number of absorption sites in PMMA. Positron annihilation lifetime spectroscopy (PALS) studies detected variations in the free volume properties of the polymer films as a function of plasticizer content.The accessible free volume as measured by PALS was significantly less in the PMMA films compared to the PIB, and this result correlates favourably with differences in the QCM response pattern. The QCM results have been rationalized in terms of free volume theory which is responsible for the higher hydrocarbon diffusion/sorption with increased plasticizer content.