Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Interfaces and Thin Films I (joint session CPP/DY/O)
DY 17.1: Talk
Monday, March 16, 2020, 16:30–16:45, ZEU 260
In Situ Monitoring Mesoscopic Deformation of Nanostructured Porous Titania Films Caused by Water Ingression — Lin Song1,2, Monika Rawolle1, Nuri Hohn1, Jochen S. Gutmann3, Henrich Frielinghaus4, and •Peter Müller-Buschbaum1,5 — 1Lehrstuhl für funktionelle Materialien, Physik Department, TU München, 85748 Garching, Germany — 2Xian Institute of Flexible Electronics, Northwestern Polytechnical University, Xian 710072, Shaanxi, China — 3Fakultät für Chemie, Universität Duisburg-Essen, 45141, Essen, Germany — 4JCNS at MLZ, Forschungszentrum Jülich GmbH, 85748 Garching, Germany — 5MLZ, TU München, 85748 Garching, Germany
Nanostructured porous titania films are used in many energy related applications. We investigate the temporal evolution of the mesoscopic deformation of mesoporous titania films synthesized via block copolymer assisted sol-gel chemistry with in situ grazing incidence small-angle neutron scattering (GISANS) during exposure to water vapor. Two types of mesoporous titania films are compared, which have a different degree of structural stability, depending on the applied annealing temperature in nitrogen atmosphere. Water ingression causes a gradual structure deformation in terms of decreasing center-to-center distances and broadening of the size distribution of the titania nanostructures. Based on the evolution of the mesopore size obtained from in situ GISANS measurements, the results show which type of titania structure is more stable against water infiltration.