A numerical model was developed to predict gas-phase nucleation of particles during silane pyrolysis. The model includes a detailed clustering mechanism for the formation of hydrogenated silicon clusters containing up to ten silicon atoms. This mechanism was coupled to an aerosol dynamics moment model to predict particle growth, coagulation, and transport. Both zero-dimensional transient simula...

Measurements on the composition of nanometersized atmospheric particles are the key to understand which vapors participate in the secondary aerosol formation processes. Knowledge on these processes is crucial in assessing the climatic effects of secondary aerosol formation. We present data of >2 nm particle concentrations and their water-affinity measured with the Condensation Particle Counter ...

Although the role of methanesulfonic acid (HMSA) in particle formation in the gas phase has been extensively studied, the details of the HMSA-induced ion pair particle formation at the air-water interface are yet to be examined. In this work, we have performed Born-Oppenheimer molecular dynamics simulations and density functional theory calculations to investigate the ion pair particle formatio...

We present comprehensive results on continuous atmospheric cluster and particle measurements in the size range ∼1–42 nm within the European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) project. We focused on characterizing the spatial and temporal variation of new particle formation events and Correspondence to: H. E. Manninen ([email protected]) r...

Introduction Conclusions References

There has been increasing concern regarding the cosmetic aspects of skin in recent years. Computational simulation can be useful in understanding the mechanism underlying skin formation. The bottom of the epidermis is called the basal layer and is very undulation. In this study, we focus on the basal layer formation. We created a particle model, which forms an undulation basal layer and regener...

Solid particles in protoplanetary disks that are sufficiently super-solar in metallicity overcome turbulence generated by vertical shear to gravitationally condense into planetesimals. Super-solar metallicities result if solid particles pile up as they migrate starward due to aerodynamic drag. Previous analyses of aerodynamic drift rates that account for mean flow differences between gas and pa...

New particle formation during α-and β-pinene oxidation Abstract Introduction Conclusions References Tables Figures Back Close Atmospheric Chemistry and Physics Discussions New particle formation during α-and β-pinene oxidation by O 3 , OH and NO 3 , and the influence of water vapour: particle size distribution studies Abstract Introduction Conclusions References Tables Figures Back Close Abstra...

Particle formation at a continental background site: comparison of model results with observations U. Uhrner, W. Birmili, F. Stratmann, M. Wilck, I. J. Ackermann, and H. Berresheim Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany Division of Environmental Health and Risk Management, Birmingham University, B15 2TT, UK Institute for Tropospheric Research, Permoserstr. ...

Nanostructured Cu-20Fe alloy was synthesized by mechanical alloying process and the effects of process control agents (PCA) on the phase formation, crystallite refinement and morphology of powder particles were studied. The dissolution of Fe into Cu matrix and the morphology of powder particles were analyzed by X-ray diffraction (XRD) technique and scanning electron microscopy (SEM), respective...