TY  - JOUR
AU  - Song, Lin
AU  - Rawolle, Monika
AU  - Hohn, Nuri
AU  - Gutmann, Jochen S.
AU  - Frielinghaus, Henrich
AU  - Müller-Buschbaum, Peter
TI  - In Situ Monitoring Mesoscopic Deformation of Nanostructured Porous Titania Films Caused by Water Ingression
JO  - ACS applied materials & interfaces
VL  - 11
IS  - 35
SN  - 1944-8252
CY  - Washington, DC
PB  - Soc.
M1  - FZJ-2019-04770
SP  - 32552 - 32558
PY  - 2019
AB  - Nanostructured porous titania films are used in many energy related applications. In this work, the temporal evolution of the mesoscopic deformation of mesoporous titania films synthesized via block copolymer assisted sol-gel chemistry is investigated with in situ grazing incidence small-angle neutron scattering (GISANS) during exposure to D2O vapor. Two types of mesoporous titania films are compared, which have a different degree of structural stability, depending on the applied annealing temperature (400 °C versus 600 °C) 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 that structures synthesized at lower temperature undergo a stronger deformation due to the lower elastic modulus originating from larger pores, despite having a higher degree of order.
LB  - PUB:(DE-HGF)16
C6  - pmid:31397150
UR  - <Go to ISI:>//WOS:000484831100108
DO  - DOI:10.1021/acsami.9b10750
UR  - https://juser.fz-juelich.de/record/865239
ER  -