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582 results on '"Bontempi E"'

54. Assessment of integrated aerosol sampling techniques in indoor, confined and outdoor environments characterized by specific emission sources

Author

Borgese, L., Chiesa, Maria, Assi, A., Marchesi, C., Mutahi, A. W., Kasemi, F., Federici, S., Finco, Angelo, Gerosa, Giacomo Alessandro, Zappa, D., Comini, E., Carnevale, C., Volta, M., Placidi, D., Lucchini, R., Bontempi, E., Depero, L. E., Chiesa M. (ORCID:0000-0002-5636-4212), Finco A. (ORCID:0000-0002-2252-5129), Gerosa G. (ORCID:0000-0002-5352-3222), Borgese, L., Chiesa, Maria, Assi, A., Marchesi, C., Mutahi, A. W., Kasemi, F., Federici, S., Finco, Angelo, Gerosa, Giacomo Alessandro, Zappa, D., Comini, E., Carnevale, C., Volta, M., Placidi, D., Lucchini, R., Bontempi, E., Depero, L. E., Chiesa M. (ORCID:0000-0002-5636-4212), Finco A. (ORCID:0000-0002-2252-5129), and Gerosa G. (ORCID:0000-0002-5352-3222)

Abstract

This paper highlights advantages and drawbacks due to the use of portable and low-cost devices for aerosol sampling, showing their performances during an aerosol monitoring campaign with the parallel use of the gravimetric sampling reference method and a cascade impactor. A specific monitoring campaign was held running all instruments in parallel in indoor, confined, and outdoor environments characterized by local emission sources or particulate matter background concentra-tions. PM2.5 concentrations were used to compare data emerging from the different instruments adopted. Significant underestimation of PM2.5 emerged when comparing data coming from optical sensors with those estimated by the cascade impactor, whose data resulted in being coherent with gravimetric determination, integrated over the same sampling time. A cause–effect relationship between PM2.5 concentrations and specific emission sources was found when observing the daily patterns of all the real-time sampling devices. It emerged that optical devices are useful for detecting concentration trends, the presence of peak values, or changes in the background value, even if with limited accuracy and precision. The comparison with particle size distributions obtained by the cascade impactor data allowed us to define which particle sizes are not detected by different optical devices, evidencing a low representativeness of optical low-cost sensors for health exposure measurements. The correlations among the specific particle size fractions detected by the cascade im-pactor and their specific emission sources were particularly high for car emissions in a semi-confined garage area.

Published
2021

63. Thermal transformations and stability of organometallic materials with electrical and optical properties: The case of polycrystalline cis-[Ir(CO)(sub 2)Cl(C(sub 5)H(sub 5)N)]

Author

Bergese, P., Bontempi, E., Dragonetti, C., Roberto, D., Ugo, R., Colombo, I., and Depero, L.E.

Subjects
Iridium -- Optical properties, Iridium -- Thermal properties, Iridium -- Electric properties, Infrared spectroscopy -- Usage, Organometallic compounds -- Optical properties, Organometallic compounds -- Thermal properties, Organometallic compounds -- Electric properties, Chemicals, plastics and rubber industries
Abstract

The solid-state transformations under heating of cis-[Ir(CO)(sub 2)C1(C(sub 5)H(sub 5)N)] are examined by integrating infrared spectroscopy, conventional and bidimensional X-ray diffraction, thermal analysis, and hot stage optical microscopy. The structural changes associated with the solid-state transformations of organometallic compounds can be successfully achieved by integrating different investigation techniques.

Published
2005

93. Effect of COSMOS technologies in detoxifying municipal solid waste incineration fly ash, preliminary results

Author

Piccinelli, E, Lasagni, M, Collina, E, Bonaiti, S, Bontempi, E, PICCINELLI, ELSA, LASAGNI, MARINA, COLLINA, ELENA MARIA, Bontempi, E., Piccinelli, E, Lasagni, M, Collina, E, Bonaiti, S, Bontempi, E, PICCINELLI, ELSA, LASAGNI, MARINA, COLLINA, ELENA MARIA, and Bontempi, E.

Abstract

This study investigates the effect of technologies for heavy metal stabilization on the concentration of PolyChlorinatedDibenzo-p-Dioxins (PCDD) and PolyChlorinatedDibenzoFurans (PCDF), abbreviated PCDD/F, in Municipal Solid Waste Incineration (MSWI) fly ash. We determined the variation of the Total Organic Carbon (TOC) and PCDD/F concentration between raw and stabilized material. The technologies, that already proved to be very promising for heavy metal entrapment, showed encouraging results also for PCDD/F detoxification. This result could be very impacting on the management of MSWI fly ash: at the best of our knowledge, there are no methods, in literature, that can provide good results in stabilization of heavy metals, and abatement of chlorinated organic pollutants contained in the same matrix.

Published
2017

100. Variability of physical characteristics of electro-sprayed poly(3-hexylthiophene) thin films.

Author

Ali, M., Abbas, M., Shah, S. K., Bontempi, E., Colombi, P., Di Cicco, A., and Gunnella, R.

Subjects
THIN films, X-ray diffraction, SOLAR cells, PHOTOELECTRON spectroscopy, PHOTOELECTRICITY
Abstract

Structural and electronic properties of homogeneous poly(3-hexylthiophene) (P3HT) films obtained from the electro-spray method were presented by means of grazing incidence x-ray diffraction, atomic force microscopy, optical absorption, photoelectron spectroscopy, and (photo)electrical conductivity. Starting from different solution concentrations and flow rate conditions, differently assembled thin films were obtained whose physical properties were peculiarly different from those ones obtained by other deposition methods. If properly refined, the method could in principle broaden the spectrum of the existing nano and microscale structures of the P3HT thin films. [ABSTRACT FROM AUTHOR]

Published
2011
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