Images and properties of individual nucleated particles

Németh, Zoltán and Pósfai, Mihály and Nyirő-Kósa, Ilona and Aalto, Pasi and Kulmala, Markku and Salma, Imre (2015) Images and properties of individual nucleated particles. Atmospheric Environment (123). pp. 166-170. ISSN 1352-2310

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Abstract

Atmospheric aerosol particles were collected in Budapest, Hungary in AprileJune onto lacey Formvar substrates by using an electrostatic precipitator during the beginning phase of the particle growth process in ten nucleation and growth events. Median contribution of the nucleated particles - expressed as the concentration of particles with a diameter between 6 and 25 nm to the total particle number concentration e was 55%, and the median electrical mobility diameter of the particles was approximately 20 nm. The sample was investigated using high-resolution transmission electron microscopy (TEM) and electron energy-loss spectroscopy. Major types of individual particles such as soot, sulphate/ organic and tar ball particles were identified in the sample. In addition, particles with an optical diameter range of 10e30 nm were also observed. They clearly differed from the other particle types, showed homogeneous contrast in the bright-field TEM images, and evaporated within tens of seconds when exposed to the electron beam. They were interpreted as representatives of freshly nucleated particles.

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