The performance of particle‐based products depends on a multiple set of particle properties. To monitor them during particle manufacturing, three novel aerosol measurement techniques were developed: wide‐angle light scattering (WALS), three‐dimensional laser scattering (3D‐LSS), and differential aerodynamic particle sizing (DAPS). They measure particle shape, aggregate structure, and particle size, i.e., radius of gyration and aerodynamic diameter. The techniques were tested for rod‐like organic pigments and partially sintered SiO2 aggregates, which were produced by two new aerosol generators.

This article presents a novel method to encapsulate gas-borne nanoparticles with a polymeric shell. This method implies heterogeneous condensation of monomer vapor around the surface of nanoparticles as nuclei and polymerization is then subsequently started by addition of NH 3 as aerosol initiator. Ag and SiO 2 nanoparticles were generated as inorganic core by spark discharge and nebulization, respectively, and glycidyl methacrylate (GMA) was used as organic monomer. The effect of several parameters, including vapor pressure of monomer and properties of inorganic core such as morphology, material, particle size, and production method on the thickness of polymeric shell and morphology of resulting nanocomposites has been investigated. The particle size distribution and morphology of the resulting core-shell nanoparticles have been studied via scanning mobility particle sizer (SMPS) and transmission electron microscope (TEM). Finally, the coating efficiency was determined by aerosol photoemission (APE) and the results show that monomer and polymer coating efficiency are 99% and 60%, respectively.

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Offene Nanopartikel‐Agglomerate aus SiO2‐ und Pt‐Primärpartikeln werden in einem einstufigen Niederdruckimpaktor fragmentiert. Dabei zeigt sich, dass mit abnehmendem Auftreffwinkel eine stärkere Fragmentierung auftritt. Der Fragmentierungsgrad kann mit den ermittelten Projektionsflächen der Ausgangsagglomerate und der Fragmente beschrieben werden, während die ermittelten Verläufe des Fragmentierungsgrades mit der Weibull‐Statistik erfasst werden können. Dabei werden als Parameter die Einsatzenergie und eine Materialkonstante verwendet, die beide auch eine Funktion des Impaktionswinkels sind.