Coating of Silica and Titania Aerosol Nanoparticles by Silver Vapor Condensation

Autor:	Juha Harra, Paxton Juuti, Minnamari Vippola, Eleftheria Roumeli, Miika Sorvali, Jaakko Yli-Ojanperä, Janne Haapanen, Mari Honkanen, Jyrki M. Mäkelä
Rok vydání:	2015
Předmět:	Materials science Nucleation Nanoparticle Nanotechnology engineering.material Pollution Silver nanoparticle Coating Chemical engineering Transmission electron microscopy Rutile visual_art visual_art.visual_art_medium engineering Environmental Chemistry Particle General Materials Science Ceramic
Zdroj:	Aerosol Science and Technology. 49:767-776
ISSN:	1521-7388 0278-6826
DOI:	10.1080/02786826.2015.1072263
Popis:	Silica and titania aerosol nanoparticles are coated with silver through a physical coating process. The silver is evaporated in a tubular furnace flow system and condensed on the ceramic carrier particles with diameters of approximately 100 nm. The temperature gradient in the furnace system is optimized in order to avoid homogeneous nucleation of the silver. The generated ceramic–silver composite nanoparticles are characterized with aerosol measurements and analytical transmission electron microscopy. Two completely different particle morphologies are clearly observed, silver-decoration and composite doublet, with amorphous silica and crystalline rutile titania as the carrier particles, respectively. The former morphology consists of multiple silver nanodots with diameters of 1–10 nm, while in the latter morphology the silver had formed a larger structure with a size comparable to that of the carrier particle. Different shapes are observed in these larger silver structures, such as triangular, rodlike, an...
Databáze:	OpenAIRE
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