Freitag, 07. September 2018, 15:15 - 16:00 iCal
Guest talk: Prof. David Grosso, France
Institut Matériaux Microélectronique et Nanosciences de
Provence, Aix-Marseille Université, France
Sol-gel-based nanostructured coatings, processing by dip-coating and characterization by ellipsometry
Hörsaal 4, Fakultät für Chemie
Währinger Straße 42, 1090 Wien
Vortrag
Complex hierarchical nano structured (hybrid) coatings can be achieved when combining chemical advanced bottom-up strategies, such as self-assembly and sol-gel chemistry, together with liquid solution processing. Amongst them, dip-coating is an extremely versatile tool to prepare coatings of various chemical compositions and structures from liquid solutions and has been used for many decades without taking advantage of its whole potentiality. This communication reports first on the recent implementations of the dip-coating process, includ-ing controlled atmosphere, capillary deposition, thickness gradient, deposition from supernatant, angle depend-ence deposition, and single side deposition. Besides, in most applications, sol-gel coatings interact with the am-bient atmosphere and physical-chemical properties may be altered through temperature and humidity varia-tion or adsorption of volatiles species present in the surrounding medium. Such phenomena are difficult to as-sess and it will be demonstrated that ellipsometry is not only a technique adapted to deduce optical constant and physical thickness of optical layers, but is also highly appropriated to the determination of adsorp-tion/desorption mechanisms. Finally, many microfabrication tools can be used to further process the coating and obtained controlled patterns, amongst which soft-nano imprint lithography (Soft-NIL) has proven to be simple to apply to the as-prepared xerogel. This approach will be discussed in terms of adjustment of critical processing parameters and applications in controlled wetting, photonics and gas detection will be presented.
Veranstalter
Fakultät für Chemie, Institut für Anorganische Chemie - funktionelle Materialien
Kontakt
Lena Yadlapalli
Dekanat der Fakultät für Chemie
+43-1-4277-52012
lena.yadlapalli@univie.ac.at
Erstellt am Donnerstag, 09. August 2018, 12:02
Letzte Änderung am Montag, 27. August 2018, 09:39