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Lignosulfonate-Stabilized Nanoparticles: Properties and Applications

Date Mi, 22.05.2013 - Mi, 22.05.2013
Time 10.15
Speaker Dr. Grzegorz Milczarek, Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, Poznan, Poland
Location Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern
Program The application of biorenewable materials in the design and development of advanced materials has been the area of rapidly increasing patent and literature activity. Lignosulfonates (LSs) are sulfonated derivatives of parent lignin which is the second (after cellulose) most abundant biopolymer found mainly in wood and grass. They are produced as by-products of chemical pulping of wood during making of paper. From the chemical structure point of view, lignosulfonates are easily oxidizable amphiphilic polymers showing surfactant properties. This makes them especially useful as stabilizing agents for nanoparticles. In this presentation, the chemical structure of lignin and lignosulfonates will be briefly discussed. More attention will be put on how LSs can be used in preparation of various nanoparticles such as: silver, gold, selenium and cyanometalates. The examples of applications presented will provide a brief overview of spectrophotometric chemical sensing based on silver and gold nanoparticles, Raman spectroscopy on nanostructured surfaces based on LS-stabilized silver and gold nanoparticles (SERS) and electrocatalysis with nanosized LS-stabilized transition metal hexacyanometalates.
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