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2020-01-15
14:02
DBCoverage [PUBDB-2020-00311] Journal Article

Atomic-Scale Identification of the Electrochemical Roughening of Platinum
ACS central science 5(12), 1920 - 1928 () [10.1021/acscentsci.9b00782]  GO
Electrode degradation under oxidizing conditions is a major drawback for large-scale applications of platinumelectrocatalysts. Subjecting Pt(111) to oxidation−reduction cycles is known to lead to the growth of nanoislands. [...]
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2020-01-15
11:54
OpenAccess [PUBDB-2020-00290] Journal Article

The dualism between adatom- and vacancy-based single crystal growth models
In homoepitaxial crystal growth, four basic growth morphologies (idealized growth modes) have been established that describe the deposition of atoms on single crystal surfaces: step-flow, layer-by-layer, mound formation, and random/self-affine growth. Mound formation leads to nano-scale surface patterning. [...]
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2019-12-19
15:51
[PUBDB-2019-05598] Journal Article
et al
Water and Atomic Hydrogen Adsorption on Magnetite (001)
We investigated structural changes of the magnetite (001) surface upon exposureto water vapor at pressures up to 10mbar as well as upon exposure to atomic hydrogenusing surface X-ray diffraction, scanning tunneling microscopy, infrared spectroscopyand X-ray photoelectron spectroscopy. Following a full structural analysis, we foundfor both adsorbates, that the surface is roughening on an atomic level, indicating signif-icant iron diffusion at the surface and in the near-surface region at room temperature.We found that this process is accompanied for both adsorbates by a lifting of thesubsurface cation vacancy reconstruction present after preparation under ultra-highvacuum conditions. [...]
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2019-12-18
15:56
OpenAccess [PUBDB-2019-05420] Journal Article
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Gas-Induced Segregation in Pt-Rh Alloy Nanoparticles Observed by In Situ Bragg Coherent Diffraction Imaging
Bimetallic catalysts can undergo segregation or redistribution of the metals driven by oxidizing andreducing environments. Bragg coherent diffraction imaging (BCDI) was used to relate displacement fieldsto compositional distributions in crystalline Pt-Rh alloy nanoparticles. [...]
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2019-11-27
16:53
OpenAccess [PUBDB-2019-04550] Contribution to a conference proceedings/Contribution to a book
et al
Nitrogen Infusion Sample R at DESY
19th International Conference on RF Superconductivity, DresdenDresden, Germany, 30 Jun 2019 - 5 Jul 20192019-06-302019-07-05 JACoW Publishing, Geneva, Switzerland 77-82 () [10.18429/JACOW-SRF2019-MOP023]  GO
The European XFEL continuous wave upgrade requires cavities with reduced surface resistance (high Q-values) for high duty cycle while maintaining high accelerating gradient for short-pulse operation. A possible way to meet the requirements is the so-called nitrogen infusion procedure. [...]
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2019-11-20
16:46
OpenAccess [PUBDB-2019-04336] Journal Article
et al
Solution blow spinning of polymer/nanocomposite micro-/nanofibers with tunable diameters and morphologies using a gas dynamic virtual nozzle
Uniform endless fibers are ubiquitous and their applications range from functional textiles over biomedical engineering to high-performance filtering and drug delivery systems. Here, we report a new method for the direct, reproducible fabrication of uniform polymer and composite micro-/nanofibers using a microfluidic gas flow focusing nozzle (Gas Dynamic Virtual Nozzle (GDVN)) relinquishing the need for external fiber pulling mechanisms. [...]
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ddc:600
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2019-11-20
16:34
OpenAccess [PUBDB-2019-04335] Journal Article
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Niobium near-surface composition during nitrogen infusion relevant for superconducting radio-frequency cavities
A detailed study of the near-surface structure and composition of Nb, the material of choice forsuperconducting radio-frequency accelerator (SRF) cavities, is of great importance in order to understandthe effects of different treatments applied during cavity production. By means of surface-sensitivetechniques such as grazing incidence diffuse x-ray scattering, x-ray reflectivity, and x-ray photoelectronspectroscopy, single-crystalline Nb(100) samples were investigated in and ex situ during annealing in anultrahigh vacuum as well as in nitrogen atmospheres with temperatures and pressures similar to the onesemployed in real Nb cavity treatments. [...]
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2019-11-20
14:45
OpenAccess [PUBDB-2019-04325] Journal Article
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A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars
We present a new high-pressure x-ray photoelectron spectroscopy system dedicated to probing catalytic reactions under realistic conditionsat pressures of multiple bars. The instrument builds around the novel concept of a “virtual cell” in which a gas flow onto the sample surfacecreates a localized high-pressure pillow. [...]
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2019-11-15
16:47
[PUBDB-2019-04250] Journal Article
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Modulating the Mechanical Properties of Supercrystalline Nanocomposite Materials via Solvent–Ligand Interactions
Langmuir 35(43), 13893 - 13903 () [10.1021/acs.langmuir.9b01938]  GO
Supercrystalline nanocomposite materials with micromechanicalproperties approaching those of nacre or similarstructural biomaterials can be produced by self-assembly oforganically modified nanoparticles and further strengthened bycross-linking. The strengthening of these nanocomposites iscontrolled via thermal treatment, which promotes the formation ofcovalent bonds between interdigitated ligands on the nanoparticlesurface. [...]
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2019-10-17
12:39
Embargoed OpenAccess [PUBDB-2019-03704] Journal Article
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Mapping the Pore Architecture of Structured Catalyst Monoliths from Nanometer to Centimeter Scale with Electron and X-ray Tomographies
The hierarchical pore systems of Pt/Al2O3 exhaust gas aftertreatment catalysts were analyzed with a collection of correlative imaging techniques to monitor changes induced by hydrothermal aging. Synergistic imaging with laboratory X-ray microtomography, synchrotron radiation ptychographic X-ray computed nanotomography, and electron tomography allowed quantitative observation of the catalyst pore architecture from centimeter to nanometer scale. [...]
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