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Vapours

About: Vapours is a research topic. Over the lifetime, 1153 publications have been published within this topic receiving 15022 citations.


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Journal ArticleDOI
TL;DR: Overall, fast reaction, good reproducibility, high sensitivity, and good differentiation ability between different vapours characterize the detection behaviour of the aerogels.
Abstract: This paper reports on the preparation of cellulose/reduced graphene oxide (rGO) aerogels for use as chemical vapour sensors. Cellulose/rGO composite aerogels were prepared by dissolving cellulose and dispersing graphene oxide (GO) in aqueous NaOH/urea solution, followed by an in-situ reduction of GO to reduced GO (rGO) and lyophilisation. The vapour sensing properties of cellulose/rGO composite aerogels were investigated by measuring the change in electrical resistance during cyclic exposure to vapours with varying solubility parameters, namely water, methanol, ethanol, acetone, toluene, tetrahydrofuran (THF), and chloroform. The increase in resistance of aerogels on exposure to vapours is in the range of 7 to 40% with methanol giving the highest response. The sensing signal increases almost linearly with the vapour concentration, as tested for methanol. The resistance changes are caused by the destruction of the conductive filler network due to a combination of swelling of the cellulose matrix and adsorption of vapour molecules on the filler surfaces. This combined mechanism leads to an increased sensing response with increasing conductive filler content. Overall, fast reaction, good reproducibility, high sensitivity, and good differentiation ability between different vapours characterize the detection behaviour of the aerogels.

9 citations

Journal ArticleDOI
TL;DR: In this article, a graphitized carbon black diffusive sampler for the monitoring of organic vapours in the environment and in working sites is described, where adsorbed compounds are thermally desorbed and analyzed by gas chromatography.
Abstract: A graphitized carbon black diffusive sampler for the monitoring of organic vapours in the environment and in working sites is described. Adsorbed compounds are thermally desorbed and analysed by gas chromatography Operational parameters in terms of diffusive path length, sampling time, linearity and sensitivity have been evaluated.

9 citations

Journal ArticleDOI
TL;DR: In this article, the effect of water and oil vapours and partial liquid water saturation on the rate of capillary penetration in porous media was analyzed and the effective pore radii and contact angles of sunflower oil against each medium were determined.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202337
202276
202112
202025
201914
201818