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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 23: Interfaces and Thin Films I (joint session CPP/DY/O)

CPP 23.1: Vortrag

Montag, 16. März 2020, 16:30–16:45, ZEU 260

In Situ Monitoring Mesoscopic Deformation of Nanostructured Porous Titania Films Caused by Water Ingression — Lin Song^1,2, Monika Rawolle¹, Nuri Hohn¹, Jochen S. Gutmann³, Henrich Frielinghaus⁴, and •Peter Müller-Buschbaum^1,5 — 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.