In the last years, flame spray pyrolysis (FSP) process has been proven to be an efficient method for synthesis of single- and multi-component nanoparticles oxides with tailored characteristics. Properties such as crystallite size, crystalline phase, degree of aggregation and agglomeration, surface area and porosity can be very challenging in different applications including catalysis, gas sensors as well as energy storage. In our laboratory in Milano, nanoparticles oxides are produced with a flame spray pyrolysis using an oxygen-assisted spray apparatus in order to inject the precursor coaxially with the pilot flame. The liquid precursor is normally feed through the spray nozzle by using a syringe pump. The apparatus has been designed and developed in order to produce nanoparticles in powder as well as in film. The availability of powder supported deposit is very useful for catalytic application (e.g. air and water treatment), allowing to overcome several problems of process design and implementation. To obtain the film, the nanoparticle oxides are deposited by orthogonal impingement on a cooled substrate (alumina or stainless steel) holder placed at 30 cm height above the burner. Cooling temperature was kept at about 100 °C to avoid water condensation on the holder. A pneumatically operated mechanical shutter placed above the target substrate allows the control of the exposure time of the aerosol-generated powder deposition. Temperature field along the synthesis process and nanoparticles collection is properly changed and monitored in order to obtain nanoparticles of particular chemical and physical characteristics. After synthesis, nanoparticels films are annealed in order to improve film-substrate adhesion. Synthesis of TiO2 and SiO2 are performed with this method and then characterised by means of XRD, STEM and FT-IR analysis. The results prove the potentials of the method as a scalable technology for synthesis of advance materials in powder as well as powder supported deposit.
Synthesis of Nanoparticle Oxides via Flame Spray Pyrolysis
F Migliorini;S De Iuliis;G Brunello
2018
Abstract
In the last years, flame spray pyrolysis (FSP) process has been proven to be an efficient method for synthesis of single- and multi-component nanoparticles oxides with tailored characteristics. Properties such as crystallite size, crystalline phase, degree of aggregation and agglomeration, surface area and porosity can be very challenging in different applications including catalysis, gas sensors as well as energy storage. In our laboratory in Milano, nanoparticles oxides are produced with a flame spray pyrolysis using an oxygen-assisted spray apparatus in order to inject the precursor coaxially with the pilot flame. The liquid precursor is normally feed through the spray nozzle by using a syringe pump. The apparatus has been designed and developed in order to produce nanoparticles in powder as well as in film. The availability of powder supported deposit is very useful for catalytic application (e.g. air and water treatment), allowing to overcome several problems of process design and implementation. To obtain the film, the nanoparticle oxides are deposited by orthogonal impingement on a cooled substrate (alumina or stainless steel) holder placed at 30 cm height above the burner. Cooling temperature was kept at about 100 °C to avoid water condensation on the holder. A pneumatically operated mechanical shutter placed above the target substrate allows the control of the exposure time of the aerosol-generated powder deposition. Temperature field along the synthesis process and nanoparticles collection is properly changed and monitored in order to obtain nanoparticles of particular chemical and physical characteristics. After synthesis, nanoparticels films are annealed in order to improve film-substrate adhesion. Synthesis of TiO2 and SiO2 are performed with this method and then characterised by means of XRD, STEM and FT-IR analysis. The results prove the potentials of the method as a scalable technology for synthesis of advance materials in powder as well as powder supported deposit.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
