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85 results on '"Gherardi, Sandro"'

1. Flue Gas Desulfurization in a Fixed-Bed Reactor: Mild-Condition Uptake Through Different Adsorbent Materials.

Author

Mancinelli, Maura, Spagnoli, Elena, Di Benedetto, Francesco, Cristino, Vito, Valt, Matteo, Montegrossi, Giordano, Barion, Luca, Vanzetti, Lia, Gaiardo, Andrea, Vola, Gabriele, Massa, Mattia, Martucci, Annalisa, Gherardi, Sandro, and Ardit, Matteo

Subjects
FLUE gas desulfurization, LIQUID waste, ADSORPTION kinetics, FACTORIES, OPERATING costs
Abstract

In quest of a substantial reduction in potentially toxic gas emissions into the air from industrial plants, dry flue gas desulfurization (FGD) systems offer several advantages, such as reduced operational costs, adaptability, ease of use, and the elimination of liquid waste. This study describes the development of a laboratory-scale pilot system for conducting SO2 abatement experiments using a fixed-bed reactor. To validate the experimental setup, the reactor was equipped with a control system for measuring and monitoring relative humidity, temperature, and total flux composition. The study utilized two standards, slaked lime and 13X zeolite, under identical experimental conditions to ensure comparability. This research will significantly advance the understanding of adsorbent materials for capturing low SO2 concentrations by measuring adsorption kinetics and equilibrium data. The findings highlight the impact of distinct morphological, chemical, and crystallographic properties on the efficiency of dry FGD systems. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Investigating the Temperature-Dependent Kinetics in Humidity-Resilient Tin–Titanium-Based Metal Oxide Gas Sensors.

Author

Gherardi, Sandro, Astolfi, Michele, Gaiardo, Andrea, Malagù, Cesare, Rispoli, Giorgio, Vincenzi, Donato, and Zonta, Giulia

Subjects
GAS detectors, TIN oxides, CHEMICAL kinetics, METALLIC oxides, SURFACE reactions
Abstract

Humidity is a well-known interference factor in metal oxide (MOX) gas sensors, significantly impacting their performance in various applications such as environmental monitoring and medical diagnostics. This study investigates the effects of adsorbed water on MOX conductivity using two different materials: pure tin oxide (SnO2) and a tin–titanium–niobium oxide mixture (SnTiNb)xO2 (STN). The results reveal that (SnTiNb)xO2 sensors exhibit reduced sensitivity to humidity compared to pure tin oxide, rendering them more suitable for applications where humidity presence is critical. We aimed to shed light on a still controversial debate over the mechanisms involved in the water surface interactions for the aforementioned materials also by exploring theoretical studies in the literature. Experimental analysis involves varying temperatures (100 to 800 °C) to understand the kinetics of surface reactions. Additionally, a brief high-temperature heating method is demonstrated to effectively remove adsorbed humidity from sensor surfaces. The study employs Arrhenius-like plots for graphical interpretation, providing insights into various water adsorption/desorption phenomena. Overall, this research contributes to a deeper understanding of the role of humidity in MOX gas sensor mechanisms and offers practical insights for sensor design and optimization. [ABSTRACT FROM AUTHOR]

Published
2024
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7. A Portable Device for I–V and Arrhenius Plots to Characterize Chemoresistive Gas Sensors: Test on SnO 2 -Based Sensors.

Author

Astolfi, Michele, Zonta, Giulia, Gherardi, Sandro, Malagù, Cesare, Vincenzi, Donato, and Rispoli, Giorgio

Subjects
STANNIC oxide, PNEUMATICS, DETECTORS, RASPBERRY Pi, TOUCH screens, IONIZATION chambers, GAS detectors
Abstract

Chemoresistive nanostructured gas sensors are employed in many diverse applications in the medical, industrial, environmental, etc. fields; therefore, it is crucial to have a device that is able to quickly calibrate and characterize them. To this aim, a portable, user-friendly device designed to easily calibrate a sensor in laboratory and/or on field is introduced here. The device comprises a small hermetically sealed chamber (containing the sensor socket and a temperature/humidity sensor), a pneumatic system, and a custom electronics controlled by a Raspberry Pi 4 developing board, running a custom software (Version 1.0) whose user interface is accessed via a multitouch-screen. This device automatically characterizes the sensor heater in order to precisely set the desired working temperature, it acquires and plots the sensor current-to-voltage and Arrhenius relationships on the touch screen, and it can record the sensor responses to different gases and environments. These tests were performed in dry air on two representative sensors based on widely used SnO2 material. The device demonstrated the independence of the Arrhenius plot from the film applied voltage and the linearity of the I–Vs, which resulted from the voltage step length (1–30 min) and temperature (200–550 °C). [ABSTRACT FROM AUTHOR]

Published
2023
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8. Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Author

Spagnoli, Elena, primary, Gaiardo, Andrea, additional, Fabbri, Barbara, additional, Valt, Matteo, additional, Krik, Soufiane, additional, Ardit, Matteo, additional, Cruciani, Giuseppe, additional, Della Ciana, Michele, additional, Vanzetti, Lia, additional, Vola, Gabriele, additional, Gherardi, Sandro, additional, Bellutti, Pierluigi, additional, Malagù, Cesare, additional, and Guidi, Vincenzo, additional

Published
2022
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9. Reproducibility and Repeatability Tests on (SnTiNb)O 2 Sensors in Detecting ppm-Concentrations of CO and Up to 40% of Humidity: A Statistical Approach.

Author

Astolfi, Michele, Rispoli, Giorgio, Gherardi, Sandro, Zonta, Giulia, and Malagù, Cesare

Subjects
DETECTORS, STATISTICAL reliability, WATER vapor, ENVIRONMENTAL monitoring, NANOSENSORS, HUMIDITY
Abstract

Nowadays, most medical-diagnostic, environmental monitoring, etc. devices employ sensors whose fabrication reproducibility and response repeatability assessment are crucial. The former consists of large-scale sensor manufacture through a standardized process with almost identical morphology and behavior, while the latter consists of giving the same response upon repeating the same stimulus. The thermo-activated chemoresistive sensors, which change their conductance by interacting with the molecules composing the surrounding gas, are currently employed in many devices: in particular, thick-film (SnTiNb)O2 nanosensors were demonstrated to be particularly suitable in the medical and biological fields. Therefore, a set of thirteen of them, randomly selected from the same screen-printing deposition, were laboratory tested, and the outcomes were statistically analyzed in order to assess their consistency. At first, the working temperature that maximized both the sensor sensitivity and response repeatability was identified. Then, the sensors were subjected to different gas concentrations and humidities at this optimal working temperature. It resulted in the (SnTiNb)O2 nanosensors detecting and discriminating CO concentrations as low as 1 ppm and at high humidity degrees (up to 40%) with high repeatability since the response relative standard error ranged from 0.8 to 3.3% for CO and from 3.6 to 5.4% for water vapor. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Nanostructured SmFeO3 Gas Sensors: Investigation of the Gas Sensing Performance Reproducibility for Colorectal Cancer Screening

Author

Gaiardo, Andrea, primary, Zonta, Giulia, additional, Gherardi, Sandro, additional, Malagù, Cesare, additional, Fabbri, Barbara, additional, Valt, Matteo, additional, Vanzetti, Lia, additional, Landini, Nicolò, additional, Casotti, Davide, additional, Cruciani, Giuseppe, additional, Della Ciana, Michele, additional, and Guidi, Vincenzo, additional

Published
2020
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23. Chemoresistive Nanostructured Sensors for Tumor Pre-Screening

Author

Astolfi, Michele, primary, Zonta, Giulia, additional, Landini, Nicolò, additional, Gherardi, Sandro, additional, Rispoli, Giorgio, additional, Anania, Gabriele, additional, Benedusi, Mascia, additional, Guidi, Vincenzo, additional, Palmonari, Caterina, additional, Secchiero, Paola, additional, Tisato, Veronica, additional, Valt, Matteo, additional, and Malagù, Cesare, additional

Published
2019
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34. Use of Gas Sensors and FOBT for the Early Detection of Colorectal Cancer

Author

Zonta, Giulia, primary, Anania, Gabriele, additional, Togni, Aldo de, additional, Gaiardo, Andrea, additional, Gherardi, Sandro, additional, Giberti, Alessio, additional, Guidi, Vincenzo, additional, Landini, Nicolò, additional, Palmonari, Caterina, additional, Ricci, Luciano, additional, and Malagù, Cesare, additional

Published
2017
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