10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Characterization of Spray Aerosols Generated from Particle-Free Solutions and Nano-Particle Containing Suspensions (Nanoaers)
LARS HILLEMANN, Paul Bergelt, Frank Bierkandt, Sandra Wagener, Jutta Tentschert, Emilia Visileanu, Hannes Hinterbichler, Helfried Steiner, Günther Brenn, Felipe Goni de Cerio, Joseph D. Brain, Michael Stintz, Technische Universität Dresden
Abstract Number: 1236 Working Group: Aerosol Exposure
Abstract Engineered nano materials (ENM) have a wide range of uses as additives in sprays (e.g. cosmetics, cleaning products, and coatings). The application of sprays generates an overspray, which may be inhaled by the user. The health risks of the inhaled aerosol depend on the particle size, but also on the composition of the aerosol. Small particles, including those in the nanometer size range, can reach deeper regions of the respiratory system. In turn, the aerosol particle size distribution depends on the parameters of the spraying process and the properties of the atomized fluid. Therefore, when the atomized fluid contains ENM, we want to know, if the aerosol contains particles of ENM in the nanometer size range, will there be a toxic effect in the respiratory system.
For this project, a test chamber was built to spray ENM containing suspensions onto an impaction plate and to measure the particle size distribution of the overspray at defined breathing distances. Eventually, lung cells will be exposed to the overspray in the further course of the project.
A spray can for customized applications was used for the spraying, which generates droplets in the size range similar to commercially available products.
The ENMs selected are nano-Ag, which is used for its bacterial inhibiting properties (e.g. in cosmetics or textiles), and CeO2, which is often added to lacquers and wood preservatives to improve their UV stability. CeO2 nanoparticles belong to the group of respirable granular bio-durable particles. Both materials are dispersed separately in solutions containing ultra-pure water, ethanol, TEA, HCl, MEK and Silanes in different compositions. Because of the strong dependence of the aerosol size distribution on the liquid properties, a test series was performed using the described setup with particle-free solutions, starting with ultra-pure water, and gradually adding components of the desired solution. Formulations with particles will show when any component generates measurable dried particles in the nanometer size range in the overspray.
This contribution is an important first step in this project. It describes the size distribution of droplets and dried particles released by the used spray can for different suspensions and solutions.
This work is supported by SIINN ERA-NET, which is funded under the ERA-NET scheme of the Seventh Framework Programme of the European Commission, Research Directorate- General, Grant Agreement No. 265799, and the German Federal Ministry of Education and Research.