Determination of the packing fraction in photonic glass using synchrotron radiation nanotomography

Photonic glass is a material class that can be used as photonic broadband reflectors, for example in the infrared regime as thermal barrier coating films. Photonic properties such as the reflectivity depend on the ordering and material packing fraction over the complete film thickness of up to 100 μm. Nanotomography allows acquiring these key parameters throughout the sample volume at the required resolution in a non-destructive way. By performing a nanotomography measurement at the PETRA III beamline P05 on a photonic glass film, the packing fraction throughout the complete sample thickness was analyzed. The results showed a packing fraction significantly smaller than the expected random close packing giving important information for improving the fabrication and processing methods of photonic glass material in the future

Destabilization of LiBH4 by Nanoconfinement in PMMA–co–BM Polymer Matrix for Reversible Hydrogen Storage

Destabilization of LiBH4 by nanoconfinement in poly (methyl methacrylate)-co-butyl meth-acrylate (PMMA-co-BM), denoted as nano LiBH4-PMMA-co-BM, is proposed for reversible hydrogen storage. The onset dehydrogenation temperature of nano LiBH4-PMMA-co-BM is reduced to 80C (DeltaT=340 and170 °C as compared with milled LiBH4 and nanoconfined LiBH4 in carbon aerogel,respectively).At120°C under vacuum,nanoLiBH4-PMMA-co-BM releases 8.8 wt.% H2 with respect to LiBH4 content within 4 h during the 1st dehydrogenation, while milled LiBH4 performs no dehydrogenation at the same temperature and pressure condition. Moreover,nanoLiBH4-PMMA-coBM can be rehydrogenated at the mildest condition(140°C under50 barH2 for12h) among other modifiedLiBH4 reportedinthepreviousliterature

Nanotomography of Inverse Photonic Crystals Using Zernike Phase Contrast

X-ray full field microscopy usingsynchrotron radiation is afrequently used tool inmaterial science. In particular for low absorbing samples,however,the contrast is often not sufficient for tomography. To enhance the contrast of this type of materialsthe established technique of Zernike Phase Contrast(ZPC) [1,2,3]has been implementedat the Nanotomography endstationof the Imaging Beamline P05 at PETRA III storage ring, located at DESY (Hamburg, Germany).Using an energy of 11 keV, a spatial resolution of 100nm wasachieved and the obtainedhigh contrast made 3D investigation of low absorbing materials possible. Inverse photonic crystals consisting of hollow spheres absorbvery littledue to their high air content and are therefore an ideal test system for the ZPC tomography setup

Nanotomography of Inverse Photonic Crystals Using Zernike Phase Contrast – CORRIGENDUM

X-ray full field microscopy usingsynchrotron radiation is afrequently used tool inmaterial science. In particular for low absorbing samples,however,the contrast is often not sufficient for tomography. To enhance the contrast of this type of materialsthe established technique of Zernike Phase Contrast(ZPC) [1,2,3]has been implementedat the Nanotomography endstationof the Imaging Beamline P05 at PETRA III storage ring, located at DESY (Hamburg, Germany).Using an energy of 11 keV, a spatial resolution of 100nm wasachieved and the obtainedhigh contrast made 3D investigation of low absorbing materials possible. Inverse photonic crystals consisting of hollow spheres absorbvery littledue to their high air content and are therefore an ideal test system for the ZPC tomography setup