NSTI Nanotech 2009

Characterization of the size distribution of CdS and CaCO3 nanoparticles by a scanning mobility particle sizer

C.-C. Chen, W.-L. Huang, M.-H. Chou, Y.-L. Wu
National Cheng Kung University, TW

Keywords: electrospray, scanning mobility particle sizer


In the study, an electrospray system associated with a scanning mobility particle sizer (SMPS, Model 3934, TSI) was employed to analyse the particle size of CdS we synthesis and commercial available CaCO3 nanoparticles. Electrospraying has been shown to yield small droplets with a narrow size distribution when operated in the cone-jet mode[2]. The powder of CdS (potentially used as light emitting quantum dots) and CaCO3 (widely used as filler in rubber, ink, and paints) was dispersed in ethanol or DMF(N,N-dimethylformamide, HCON(CH3)2) solvent assisted with an ultrasonic oscillator and then electrosplayed to form aerosol . Because, in the powder, particles may physically agglomerate together or may stick tightly to form neck connection, the initial form of the nanoparticles (powder or slurry), the solvent, and the intensity of ultrasonic wave all will affect their dispersion. Our experimental results show that the characterization of the size distribution of nanoparticles by electrospray system associated with a scanning mobility particle sizer is promised, and are qualitatively in consistent with those by the XRD and TEM, and quantitatively, some disagreements exist, further correlation is needed. In addition, cares should be taken to use proper solvent and operation parameters when applying the method.
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