Chemisorption of hydrocarbons on metallic nanoparticles represents a fundamental step in catalytic processes of industrial relevance such as epoxidation reactions. In this work we study the adsorption of a simple unsaturated hydrocarbon (1-hexene) by gasborne silver and gold nanoparticles. Both kinds of metallic nanoparticles were produced by evaporation and condensation in a nitrogen flow, but using different methods. The uptake was determined by measuring the change of the mobility diameter of size selected 10 nm particles using a Tandem-Differential Mobility Analysis (T-DMA) setup. While no uptake of hexene by gold could be measured, the uptake on silver showed to be both concentration and temperature dependent. The uptake showed a maximum at a temperature of 170 +/- 10 degrees C. The addition of oxygen was evaluated and its presence did not alter the results. FT-IR measurements confirmed the adsorbed state of 1-hexene on silver.

In this paper, an aerosol-based process is shown for imparting antibacterial property to textiles. Metal nanoparticles (copper and silver) are produced by means of DC electrical discharges (glow and arc) between two electrodes in nitrogen at ambient pressure and passed through textile fabrics (cotton, polyester and lyocell) which act as filter media. The particle retention efficiency of the fabrics is measured in dependence of particle size and face velocity. The antibacterial performance of the fabrics treated with metal nanoparticles and its durability to wash is assessed according to industry standards. Loads of about 200 ppm (2x10-2 %wt.) of nanoparticles of copper or silver give strong antibacterial property but the colour and hand feeling of the fabrics are significantly affected. Nanosilver loads in the order of 50 ppm (5x10-3 %wt.) impart comparably high antibacterial property to the fabrics with no visible impact on colour and hand touching, and wash fastness is proven for 10 washes. Small silver nanoparticles (<5 nm) result in much less release of silver to wash water, with respect to larger nanoparticles (>20 nm).

The generation of copper, nickel, and copper-nickel alloy nanoparticles by spark discharge was studied, using different bespoke alloy feedstocks. Roughly spherical particles with a primary particle Feret diameter of 2–10 nm were produced and collected in agglomerate form. The copper-to-nickel ratios determined by Inductively coupled plasma mass spectrometry (ICP-MS), and therefore averaged over a large number of particles, matched the nominal copper content quite well. Further investigations showed that the electrode compositions influenced the evaporation rate and the primary particle size. The evaporation rate decreased with increasing copper content, which was found to be in good accordance with the Llewellyn-Jones model. However, the particle diameter was increasing with an increasing copper content, caused by a decrease in melting temperature due to the lower melting point of copper. Furthermore, the alloy compositions on the nanoscale were investigated via EDX. The nanoparticles exhibited almost the same composition as the used alloy feedstock, with a deviation of less than 7 percentage points. Therefore, no segregation could be detected, indicating the presence of a true alloy even on the nanoscale.

Chemie Ingenieur TechnikVolume 88, Issue 9 p. 1356-1356 Vortrag Generierung von Kupfer, Nickel und legierten Nanopartikeln mittels Funkenentladung A. Muntean, Corresponding Author A. Muntean alex.muntean@icvt.uni-stuttgart.de Universität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandUniversität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandSearch for more papers by this authorM. Wagner, M. Wagner Karlsruher Institut für Technologie, Institut für Mechanische Verfahrenstechnik und Maschinen, Straße am Forum 8, 76131 Karlsruhe, DeutschlandSearch for more papers by this authorDr. J. Meyer, Dr. J. Meyer Karlsruher Institut für Technologie, Institut für Mechanische Verfahrenstechnik und Maschinen, Straße am Forum 8, 76131 Karlsruhe, DeutschlandSearch for more papers by this authorPD Dr. M. Seipenbusch, PD Dr. M. Seipenbusch Universität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandSearch for more papers by this author A. Muntean, Corresponding Author A. Muntean alex.muntean@icvt.uni-stuttgart.de Universität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandUniversität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandSearch for more papers by this authorM. Wagner, M. Wagner Karlsruher Institut für Technologie, Institut für Mechanische Verfahrenstechnik und Maschinen, Straße am Forum 8, 76131 Karlsruhe, DeutschlandSearch for more papers by this authorDr. J. Meyer, Dr. J. Meyer Karlsruher Institut für Technologie, Institut für Mechanische Verfahrenstechnik und Maschinen, Straße am Forum 8, 76131 Karlsruhe, DeutschlandSearch for more papers by this authorPD Dr. M. Seipenbusch, PD Dr. M. Seipenbusch Universität Stuttgart, Institut für Chemische Verfahrenstechnik, Böblinger Straße 78, 70199 Stuttgart, DeutschlandSearch for more papers by this author First published: 29 August 2016 https://doi.org/10.1002/cite.201650419AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume88, Issue9Special Issue: ProcessNet-Jahrestagung und 32. DECHEMA-Jahrestagung der Biotechnologen 2016September, 2016Pages 1356-1356 RelatedInformation

Photoinitiated polymerization in aerosols is employed for the preparation of spherical polymer particles via cationic polymerization. The UV irradiation of aerosol monomer droplets starts the cationic curing process without the employment of any solvent or additives such as stabilizers, resulting in highly pure polymers. Cross linked polymer spheres with a high gel content are obtained by processing vinyl ether and epoxy monomers via this aerosol-photopolymerization technique, which exhibits great potential for the development of multifunctional materials.