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Center for Materials Research (LaMa)

Welcome to the web sites of the Center for Materials Research
The Center for Materials research is a core-facility of JLU and supported by the departments of chemistry and physics.
It serves for running joint research projects, for the coordination of study programs in materials science and for promoting the qualification of doctoral candidates.
The Center regularly organizes events covering recent issues of materials research. It also offers central experimental resources to its member research groups.
Please find additional information in "About us".

Picture of the Month - September 2018

Here you see current insights into the research of the LaMa groups. A collection of the former pictures can be found in the Gallery.

In-plane stress development in mesoporous thin films

Bild des Monats September

The research area of mesoporous thin films became more popular in the last decade as these films enhance the material properties for several applications in (photo‑)catalysis, energy storage, photo-/electrochromics, thermal insulators or sensors. As there is still a lack of fundamental understanding the relationship between the pore structure and the mechanical properties of these mesoporous thin films, ordered mesoporous thin films of TiO2 and CexZr1-xO2 (x = 0, 0.5, 1) were prepared via an evaporation-induced self-assembly process (EISA) and subsequently investigated in terms of the developing intrinsic and residual in-plane stress. Within the cooperation with Kansai University (Osaka, Japan), these mechanical properties were determined by the curvature method which is based on the determination of the deflection of light due to concave or convex bending of the films on a substrate. This bending derives mainly from the difference of the thermal expansion coefficient α of the substrate and the film. Dense and mesoporous films were investigated in regards to the intrinsic stress during the heat treatment up to 500 °C yielding lower stress values for the PIB50-b-PEO45 templated film. A comparable behavior was observed for the residual stress at room temperature for several annealing temperatures indicating the distributed polymer and the corresponding mesopores act as relaxing agents for the system which was further verified by mesoporous CexZr1-xO2 (x = 0, 0.5, 1) thin films. Our work reveals the increase in the residual in-plane stress during the pore collapse which lays the foundation for further understanding the stress-related mechanical properties of mesoporous thin films.

Recent publication:
P. Cop, S. Kitano, K. Niinuma, B. Smarsly, H. Kozuka, Nanoscale, 2018, 15, 7002–7015.
doi: 10.1039/C8NR00793D

This picture was submittes by Pascal Cop, group of Prof. Dr. Bernd Smarsly.