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Seminar by Prof. Maurizio MUSSO (Universität Salzburg)
"Raman spectroscopy at the University of Salzburg"

IPHT colloquium
16.10.2018 02:00pm
Conference room of the IPHT, Albert-Einstein-Str. 9, 07745 Jena

Raman spectroscopic studies for the characterization of condensed matter is routinely performed at the Department of Chemistry and Physics of Materials of the University of Salzburg since several years, and some of the more recent activities deal with polymeric materials, also of biogenic nature, and very recently also with SERS.
Raman spectroscopic investigations of tannin-furanic foams and their precursor materials have been performed with several laser wavelengths, the aim being to establish a tool complementary to infrared spectroscopy for comparing their spectral signature with that of the precursor materials furfuryl alcohol, polymerized furfuryl alcohol, and Mimosa tannin, and to discuss similarities and differences to the spectral signatures of sp2 carbon-based materials, the still preserved organic nature of the tannin-furanic foam, and similarities and differences to recently reported infrared spectra. Some of these research activities are currently expanded within the Interreg Italy-Austria ITAT1023 InCIMa project, making use of the UV-Raman, IR, and μCT beamlines of the Elettra synchrotron lightsource, and in future also exploring the possibility towards SERS using the foams as substrates.
When the temperature of a semi-crystalline polymer sample like Nylon 6/6 increases up to the melting point, some relaxations processes caused by thermally activated molecular rearrangements can happen in the form of conformational changes and microscopic deformations. Associated with these relaxation processes are variations in the thermal, mechanical and dielectric properties of the polymeric sample, enabling their macroscopic detection. Raman spectroscopy has been used as an additional tool to determine the temperature ranges where relaxation processes in Nylon 6/6 get activated, these temperature ranges resulting to be in reasonable agreement with the values reported from measurements of thermal, mechanical, and dielectric properties. Some of these research activities are currently expanded within the Interreg Bavaria-Austria AB97 TFP HyMat project, in connection with biogenic polymeric hybrid materials for 3D-printing.
The ability of bone graft substitutes to promote new bone formation has been increasingly used in the medical field to repair skeletal defects or to replace missing bone in a broad range of applications in dentistry and orthopedics. A common way to assess such materials is via micro computed tomography (μ-CT), through the density information content provided by the absorption of X-rays. Information on the chemical composition of a material can be obtained via Raman spectroscopy. By investigating a bone sample from miniature pigs containing the bone graft substitute Bio Oss®, we pursued the target of assessing to what extent the density information gained by μ-CT imaging matches the chemical information content provided by Raman spectroscopic imaging.

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