In this paper a method for the quantitative determination of a morphology descriptor of free clusters with complex nanostructure is presented and applied to transition metal nanoparticles produced by a pulsed vaporization source. The method, which is based on the low-pressure aerodynamic mobility of neutral particles, can be applied as a characterization tool to a broad class of gas-phase nanoparticle sources for on-line investigation of particle growth and for quantifying coalescence versus agglomerate aggregation. We report on the application of this method for the characterization of free titanium clusters produced by a pulsed microplasma cluster source in the size range of approximately 300-6000 atoms. The clusters have an open fractal-like structure, with the fractal dimension depending on their thermal history during growth and evolving towards softer aggregates for longer residence times where lowertemperature conditions characterize the growth environment.

Accessing the fractal dimension of free clusters in supersonic beams / T. Mazza, M. Devetta, P. Milani, G. Bongiorno, M. Coreno, P.G.C. Piseri. - In: NEW JOURNAL OF PHYSICS. - ISSN 1367-2630. - 13(2011), pp. 023009.023009.1-023009.023009.13. [10.1088/1367-2630/13/2/023009]

Accessing the fractal dimension of free clusters in supersonic beams

M. Devetta
Secondo
;
P. Milani;P.G.C. Piseri
Ultimo
2011

Abstract

In this paper a method for the quantitative determination of a morphology descriptor of free clusters with complex nanostructure is presented and applied to transition metal nanoparticles produced by a pulsed vaporization source. The method, which is based on the low-pressure aerodynamic mobility of neutral particles, can be applied as a characterization tool to a broad class of gas-phase nanoparticle sources for on-line investigation of particle growth and for quantifying coalescence versus agglomerate aggregation. We report on the application of this method for the characterization of free titanium clusters produced by a pulsed microplasma cluster source in the size range of approximately 300-6000 atoms. The clusters have an open fractal-like structure, with the fractal dimension depending on their thermal history during growth and evolving towards softer aggregates for longer residence times where lowertemperature conditions characterize the growth environment.
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/178101
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