Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame

The objective of the present work is to show the potential of in situ measurements for the investigation of nanoparticles production in turbulent spray flames. This is achieved by considering multiple diagnostics to characterize the liquid break-up, the reactive flow and the particles production in...

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Autores principales:	Benedetta Franzelli, Philippe Scouflaire, Nasser Darabiha
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	in situ optical diagnostics flame synthesis TiO2 turbulence Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/15145047c4804fd49253a1d3658d3ba1
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spelling	oai:doaj.org-article:15145047c4804fd49253a1d3658d3ba12021-11-25T18:16:13ZUsing In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame10.3390/ma142270831996-1944https://doaj.org/article/15145047c4804fd49253a1d3658d3ba12021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7083https://doaj.org/toc/1996-1944The objective of the present work is to show the potential of in situ measurements for the investigation of nanoparticles production in turbulent spray flames. This is achieved by considering multiple diagnostics to characterize the liquid break-up, the reactive flow and the particles production in a spray burner for TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticle synthesis. The considered liquid fuel is a solution of isopropyl alcohol and titanium tetraisopropoxide (TTIP) precursor. Measurements show that shadowgraphy can be used to simultaneously localize spray and nanoparticles, light scattering allows to characterize the TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticles distribution in the flame central plane, and spontaneous CH* and OH* chemiluminescences, as well as global light emission results, can be used to visualize the reactive flow patterns that may differ with and without injection of TTIP. Concerning the liquid, it is observed that it is localized in a small region close to the injector nozzle where it is dispersed by the oxygen flow resulting in droplets. The liquid droplets rapidly evaporate and TTIP is quasi-immediately converted to TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticles. Finally, results show high interactions between nanoparticles and the turbulent eddies.Benedetta FranzelliPhilippe ScouflaireNasser DarabihaMDPI AGarticlein situ optical diagnosticsflame synthesisTiO2turbulenceTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7083, p 7083 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	in situ optical diagnostics flame synthesis TiO2 turbulence Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	in situ optical diagnostics flame synthesis TiO2 turbulence Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Benedetta Franzelli Philippe Scouflaire Nasser Darabiha Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
description	The objective of the present work is to show the potential of in situ measurements for the investigation of nanoparticles production in turbulent spray flames. This is achieved by considering multiple diagnostics to characterize the liquid break-up, the reactive flow and the particles production in a spray burner for TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticle synthesis. The considered liquid fuel is a solution of isopropyl alcohol and titanium tetraisopropoxide (TTIP) precursor. Measurements show that shadowgraphy can be used to simultaneously localize spray and nanoparticles, light scattering allows to characterize the TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticles distribution in the flame central plane, and spontaneous CH* and OH* chemiluminescences, as well as global light emission results, can be used to visualize the reactive flow patterns that may differ with and without injection of TTIP. Concerning the liquid, it is observed that it is localized in a small region close to the injector nozzle where it is dispersed by the oxygen flow resulting in droplets. The liquid droplets rapidly evaporate and TTIP is quasi-immediately converted to TiO<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>2</mn></msub></semantics></math></inline-formula> nanoparticles. Finally, results show high interactions between nanoparticles and the turbulent eddies.
format	article
author	Benedetta Franzelli Philippe Scouflaire Nasser Darabiha
author_facet	Benedetta Franzelli Philippe Scouflaire Nasser Darabiha
author_sort	Benedetta Franzelli
title	Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
title_short	Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
title_full	Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
title_fullStr	Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
title_full_unstemmed	Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame
title_sort	using in situ measurements to experimentally characterize tio<sub>2</sub> nanoparticle synthesis in a turbulent isopropyl alcohol flame
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/15145047c4804fd49253a1d3658d3ba1
work_keys_str_mv	AT benedettafranzelli usinginsitumeasurementstoexperimentallycharacterizetiosub2subnanoparticlesynthesisinaturbulentisopropylalcoholflame AT philippescouflaire usinginsitumeasurementstoexperimentallycharacterizetiosub2subnanoparticlesynthesisinaturbulentisopropylalcoholflame AT nasserdarabiha usinginsitumeasurementstoexperimentallycharacterizetiosub2subnanoparticlesynthesisinaturbulentisopropylalcoholflame
_version_	1718411364576264192

Using In Situ Measurements to Experimentally Characterize TiO<sub>2</sub> Nanoparticle Synthesis in a Turbulent Isopropyl Alcohol Flame

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