Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster Session

MM 34.12: Poster

Tuesday, April 1, 2014, 18:00–20:00, P4

Ordered Mesoporous Thin Films; Elastic Modulus Determination by Humidity Driven Pore Lattice Deformation — •Parvin Sharifi¹, Benedetta Marmiroli², Barbara Sartori², Fernando Cacho-Nerin^2,3, Hienz Amenitsch², Christian Ganser¹, Christian Teichert¹, and Oskar Paris¹ — ¹Institut für Physik, Montanuniversität Leoben (Franz-Josef Strasse 18, 8700 Leoben, Austria — ²Institute of Inorganic Chemistry, TU Graz (Stremayrgasse 9/IV, 8042 Graz, Austria — ³Current addresss: Beamline I14, Diamond Light Source, Harwell Science and Innovation Campus, OX11 0DE Didcot (Oxfordshire), UK

Adsorption induced deformation of mesoporous powders and thin films can provide valuable information about their mechanical properties. Two types of mesoporous thin films were prepared by dip- and spin-coating on silicon substrates using a sol made of TEOS and triblock copolymer (P123) in acidic solution followed by calcination at 400°C. GISAXS measurements revealed ordered mesoporous films with 2D hexagonal structure with a macroscopic alignment of the pore axis within the plane of the substrate. The pore-lattice deformation due to adsorption of water was determined by in-situ GISAXS in a relative humidity range of RH=5% to RH=95%. Both films showed a reversible out-of-plane contraction due to the condensation of water in the pores. Pore lattice strain vs RH, called strain isotherms, were used to determine the *pore load modulus* of the films. The results showed clear differences between the two types of samples.