Heterogeneous Nucleation of Water Vapor on Submicrometer Particles of SiC, SiO2, and Naphthalene

Heterogeneous Nucleation of n-Butanol Vapor on Submicrometer Particles of SiO2 and TiO2

“…Niessner et al (6,7) investigated the effect of surface properties of ultrafine particles on the condensation of water and n-butanol and also observed a strong dependence on particle size and chemical composition; but they obtained a critical supersaturation for the condensation of n-butanol vapor on NaCl and Ag particles smaller than that for perfectly wetted particles. In our previous studies of the nucleation of water vapor on fine aerosols, including SiC, naphthalene, SiO 2 , Al 2 O 3 , TiO 2 , and carbon black from incomplete combustion of diesel fuel, all aerosols except naphthalene induced heterogeneous nucleation better than perfectly wetted particles, in contrast to the measured contact angles, which were all greater than 25° (8,9).…”

“…The equipments and instruments mentioned above have been previously employed and explained elsewhere (8,9). Given here is a brief description to the equipment whose operation is specific to the study.…”

“…However, the dependency is not well known, and both consistent and inconsistent observations are reported (2)(3)(4)(5)(6)(7)(8). Juisto and Kocmond (2) have measured the heterogeneous nucleation of water vapor on submicrometer AgI and wax particles, and Liu et al (3) have made measurements on DOP particles.…”

“…The blank run results served as a baseline for comparison of removal due to nucleation. The experimental procedure has been described in detail (8,9); only the operation condition is given here.…”

An adsorption theory of heterogeneous nucleation of water vapour on nanoparticles

“…Chen et al, 1998Chen et al, , 1999Winkler et al, 2008); however, the selected systems were the only ones for which we found both adsorption and contact angle data so that the parameters of the theory could be determined. Note that both Porstendörfer et al (1985) and Wagner et al (2003) refer to silver nanoparticles instead of Ag 2 O.…”