FS-PETRA

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2017-06-02
13:56
[PUBDB-2017-04214] Journal Article
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Stability of a Bifunctional Cu-Based Core@Zeolite Shell Catalyst for Dimethyl Ether Synthesis Under Redox Conditions Studied by Environmental Transmission Electron Microscopy and In Situ X-Ray Ptychography
ddc:570
When using bifunctional core@shell catalysts, the stability of both the shell and core–shell interface is crucial for catalytic applications. In the present study, we elucidate the stability of a CuO/ZnO/Al$_2$O$_3$@ZSM-5 core@shell material, used for one-stage synthesis of dimethyl ether from synthesis gas. [...]
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2017-03-07
23:01
OpenAccess [PUBDB-2017-01322] Journal Article
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Structure and Composition of Isolated Core-Shell (In, Ga) N/GaN Rods Based on Nanofocus X-Ray Diffraction and Scanning Transmission Electron Microscopy
ddc:530
Nanofocus x-ray diffraction is used to investigate the structure and local strain field of an isolated (In,Ga)N/GaN core-shell microrod. Because the high spatial resolution of the x-ray beam is only 80×90  nm$^2$, we are able to investigate several distinct volumes on one individual side facet. [...]
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2017-03-07
22:35
OpenAccess [PUBDB-2017-01321] Journal Article
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Focusing hard x rays beyond the critical angle of total reflection by adiabatically focusing lenses
ddc:530
In response to the conjecture that the numerical aperture of x-ray optics is fundamentally limited by the critical angle of total reflection [Bergemann et al., Phys. Rev. [...]
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2017-03-03
11:23
OpenAccess [PUBDB-2017-01280] Journal Article
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Perfect X-ray focusing via fitting corrective glasses to aberrated optics
ddc:500
Due to their short wavelength, X-rays can in principle be focused down to a few nanometres and below. At the same time, it is this short wavelength that puts stringent requirements on X-ray optics and their metrology [...]
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2016-12-12
18:59
OpenAccess [PUBDB-2016-06117] Bachelor Thesis

Entwicklung einer Vakuumröhre für einenSpeicherring-Röntgenstrahl-Messplatz
86 pp. (2016) [10.3204/PUBDB-2016-06117] = Hamburg University of Applied Sciences, Bachelorarbeit, 2016  GO
Content of this report is the methodical development and construction of a lengthadjustablevacuum tube for scientific experiments. Aim of the development is to optimizethe experiment and to increase the flexibility. [...]
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2016-12-02
11:03
OpenAccess [PUBDB-2016-05838] Journal Article
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Tracking the density evolution in counter-propagating shock waves using imaging X-ray scattering
ddc:530
We present results from time-resolved X-ray imaging and inelastic scattering on collective excitations. These data are then employed to infer the mass density evolution within laser-driven shock waves. [...]
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2016-11-27
13:14
[PUBDB-2016-05652] Journal Article
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Beamstop-Based Low-Background Ptychography to Image Weakly Scattering Objects
ddc:570
In recent years, X-ray ptychography has been established as a valuable tool for high-resolution imaging. Nevertheless, the spatial resolution and sensitivity in coherent diffraction imaging are limited by the signal that is detected over noise and over background scattering. [...]
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2016-11-23
22:42
OpenAccess [PUBDB-2016-05569] Journal Article
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Quantitative characterization of aberrations in X-ray optics
SPIE Optical Engineering + Applications, Meeting locationSan Diego, California,
Proceedings of SPIE 9963, 99630P (2016) [10.1117/12.2237646]  GO
ddc:620
Due to the weak interaction of X-rays with matter and their small wavelength on the atomic scale, stringent requirements are put on X-ray optics manufacturing and metrology. As a result, these optics often suffer from aberrations. [...]
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2016-11-23
22:27
[PUBDB-2016-05568] Journal Article
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In Situ Ptychography of Heterogeneous Catalysts using Hard X-Rays: High Resolution Imaging at Ambient Pressure and Elevated Temperature
ddc:570
A new closed cell is presented for in situ X-ray ptychography which allows studies under gas flow and at elevated temperature. In order to gain complementary information by transmission and scanning electron microscopy, the cell makes use of a Protochips E-chipTM which contains a small, thin electron transparent window and allows heating. [...]
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2016-11-23
22:22
Embargoed OpenAccess [PUBDB-2016-05567] Journal Article
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X-rays Reveal the Internal Structure of Keratin Bundles in Whole Cells
ACS nano 10(3), 3553 - 3561 (2016) [10.1021/acsnano.5b07871]  GO
ddc:540
In recent years, X-ray imaging of biological cells has emerged as a complementary alternative to fluorescence and electron microscopy. Different techniques were established and successfully applied to macromolecular assemblies and structures in cells. [...]
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