Nucleation mode particles were investigated for their morphology using TEM and the presence or absence of solid cores was addressed. At cold start idle nucleation particles were observed in the exhaust of a diesel passenger car. These particles occurred w - Zhang, Zhe; Kleinstreuer, Clement; Kim, Chong S; Mishra, Rosaline; Mayya, YS; Kushwaha, HS (Journal of Aerosol Science, 2009)