Rajmund Mokso
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
We present the latest development in 4D microtomography. With a dedicated fast tomographic endstation at the TOMCAT beamline a full set of tomographic images can now be acquired in a fraction of a second with voxel sizes of 1-11 micrometers [1]. The large field of view ensures that statistically relevant volumes can be analyzed [2]. Tomograms at 20 Hz frequency can be achieved. In addition...
Dr
Alberto Astolfo
(PSI)
18/09/2013, 12:15
poster
Alzheimer's disease (AD) is a devastating neurodegenerative disorder causing the most prevalent form of dementia. AD is characterized by a prominent accumulation of protein aggregates in affected regions of the brain called amyloid β plaques (Aβ) that are used as markers for defining and monitoring the pathology. An active role of Aβ on the AD progress was proposed in the past suggesting the...
Dr
Davide Ferri
(PSI)
18/09/2013, 12:15
poster
A spectroscopic cell has been commissioned and tested on solid catalysts at beamline SuperXAS that enables combination of quickEXAFS and DRIFT measurements in a novel geometry in a single experiment. Pt/Al2O3, Pd/Al2O3 and Pd/CZ were tested under pulsed conditions, CO vs. O2. Beside obtaining high quality EXAFS data, IR spectra of adsorbed species both on the support and on the metal...
Thomas Geue
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
The overall focus of this study is to utilize food structuring and breakdown pathways to reduce obesity. Fat based emulsions are considered to be a suitable model system not only due to the high acceptance by consumers. Moreover, the textural mouth feeling of fat activates neuronal responses, which implement a short-term control of appetite and eating.
Mr
Shirish Chodankar
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Two surfaces in contact are found in everyday life. For hydrophilic surfaces in contact, the natural presence of a confined layer of water in the narrow gap between them has important implications for geochemical and biological processes such as swelling of clays and diffusion of water through nanopores [1]. Numerous surface force experiments have been performed on such systems [2]. However,...
Mr
Johannes Biesdorf
(Paul Scherrer Institute)
18/09/2013, 12:15
poster
Polymer electrolyte fuel cells (PEFCs) have attracted much attention during the last decade, because of extremely low emissions at very high power densities. However, before its commercialization, PEFC have to prove its durability at ambient conditions, particularly during operation at subfreezing temperatures. As the freezing mechanism inside PEFCs is not fully understood in literature,...
Dr
David Haberthür
(TOMCAT, Swiss Light Source, Paul Scherrer Institut), Mr
Sébastien Barré
(Institute of Anatomy, Bern)
18/09/2013, 12:15
poster
Rationale: The pulmonary airways are subdivided into conducting and gas-exchanging airways. The small tree of gas-exchanging airways, which is fed by the most distal conducting airway, represents an acinus. Until now a so called dissector (five consecutive sections) was used to count lung acini. We developed a faster method and determined the number of acini throughout rat lung development....
Dr
Urs Gasser Gasser
(Laboratory for Neutron Scattering, Paul Scherrer Institut)
18/09/2013, 12:15
poster
We study the form factor of soft, thermoresponsive microgels based on poly(N- isopropylacrylamide) at high effective volume fractions, where the particles must shrink or overlap to fit into the available space. Small-angle neutron scattering with contrast matching techniques is used to determine the particle form factor. The apparent particle size is found to be constant up to a volume...
Mrs
Alessandra Patera
(EMPA/ETH)
18/09/2013, 12:15
poster
Wood exposed to air at different relative humidities (RH) swells and shrinks due to moisture content changes. High-resolution phase-contrast X-Ray Tomography at the TOMCAT beamline of the Swiss Light Source, PSI Villigen, is well suited to capturing micro and nano structures of wood and is used to investigate the hygro-mechanical properties of spruce wood (Picea Abies) at cellular and...
Goran Lovric
(Paul Scherrer Institute)
18/09/2013, 12:15
poster
Lung failure represents the leading cause of morbidity and mortality worldwide and is the fourth leading cause of death in Switzerland [1,2]. Despite the fact that recent decades have brought forth a huge clinical progress in treating lung injuries, including e.g. the immediate postnatal treatment of very preterm infants, two hypotheses on the structural alterations in the gas-exchange area...
Mr
Sebastian Eberhardt
(PSI Electrochemistry Laboratory)
18/09/2013, 12:15
poster
Localization and Quantification of Phosphoric Acid in HT-PEFCs by X-Ray Tomographic Microscopy
Sebastian H. Eberhardt, F. Marone, Felix N. Büchi, Thomas J. Schmidt
Paul Scherrer Institute
CH-5232 Villigen PSI
Tel.: +41-56-310-2541
sebastian.eberhardt@psi.ch
Abstract
High temperature polymer electrolyte fuel cells (HT-PEFCs) exhibit an increased CO-tolerance of up to 2% in...
Mr
Sebastian Cartier
(Paul Scherrer Institute)
18/09/2013, 12:15
poster
MÖNCH is a charge integrating readout ASIC (Application Specific Integrated Circuit) prototype for 25 micron pixel pitch silicon sensors developed at PSI, which allows new imaging applications in the field of micron resolution and spectral imaging. It is a fully functional, small scale prototype of 4x4mm2, containing an array of 160x160 pixels with a low power consumption of 3-5 μW/pixel. The...
Dr
Manuel Guizar-Sicairos
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Imaging specimens in three-dimensions with a resolution of 100 nm or below is not an easy task, especially when representative volume elements of several tens of micrometers are required. In general, hard x-rays in the multi-keV range are needed in order to reach a depth of focus larger than the entire specimen. However, the fabrication of efficient x-ray lenses at these energies is a...
Silvia Peter
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
The high sensitivity towards electron density variations makes phase-sensitive X-ray imaging well suited for the imaging of soft tissue matter. A recently established phase-sensitive imaging method is grating interferometry (GI) which has the advantage of producing three complementary types of contrast: absorption, phase and dark-field [1]. However there are still open questions about the ...
Dr
David Haberthür
(TOMCAT, Swiss Light Source, Paul Scherrer Institut)
18/09/2013, 12:15
poster
Approximately 4 billion people, about two-thirds of the world population do not have access to diagnostic imaging. First world countries try to solve this problem by donating old radiological equipment to hospitals in need. But, according to the WHO, about 70% of the more complex devices do not function when they reach their destination in developing countries [1].
As part of the...
Dr
Zhentian Wang
(PSI)
18/09/2013, 12:15
poster
Phase contrast mammography using grating interferometer is a promising alternative to current mammography. Preserving the conventional absorption contrast, this novel technology also yields differential phase contrast and small-angle scattering contrast simultaneously. Our research team imaged mastectomy breast samples from 33 patients using this technology and a multicenter, international...
Ms
Tatsiana Burankova
(Saarland University, Paul Scherrer Institut)
18/09/2013, 12:15
poster
Protic ionic liquids are an important group of molten salts, which can form a hydrogen-bond network with proton-donor and proton-acceptor sites. The knowledge about their proton transport properties is crucial for a variety of electrochemical applications. Neutron scattering techniques are sensitive to the presence of hydrogen atoms and thus can provide useful information about proton dynamics...
Dr
Carlos Martínez Pérez
(University of Bristol, School of Earth Sciences), Dr
Manuel Guizar-Sicairos
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Conodonts are an extinct group animal that have been suggested as the first vertebrates to possess a mineralized skeleton manifest as an oropharyngeal feeding apparatus. As such, the conodont skeleton is of great significance because of the insights it provides concerning about the biology and function of the most primitive vertebrate skeleton. However, the origin of this skeleton, the...
Mr
Marios Georgiadis
(ETH Zurich)
18/09/2013, 12:15
poster
The arrangement and orientation of the ultrastructure plays an important role in the mechanical properties of inhomogeneous and anisotropic materials, such as polymers, wood, or bone. In this study, a novel method is presented, which allows deriving the three-dimensional (3D) orientation of the material’s ultrastructure in a quantitative and spatially resolved manner. The proposed 3D scanning...
Matias Kagias
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Grating interferometry (GI) is a well established phase sensitive X-ray imaging technique providing access to three complementary contrasts: absorption, differential phase and dark-field. It was recently demonstrated that the local unresolved distributions of scattering angles of the sample can be retrieved with an appropriate deconvolution procedure [1]. The three first moments of the...
Filippo Arcadu
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
This project is aimed at developing reconstruction algorithms optimized for tomographic datasets consisting of a low number of projections. In the tomographic imaging, this kind of situation occurs, for example, when the speed of the scan or the dose delivered to the biological specimens is a major concern. Conventional tomographic methods, like the filtered back projection (FBP) or...
Ms
Tatsiana Burankova
(Saarland University, Paul Scherrer Institut)
18/09/2013, 12:15
poster
The analysis of QENS-data measured on hydrogen-rich organic samples is usually started with the assumption that the incoherent signal from hydrogen determines the total scattering intensity, while the coherent contribution is considered to be negligible. On the other hand the static structure factor of many ionic liquids features so-called pre-peaks in the Q-range accessible normally by QENS;...
Grigory Smolentsev
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
A new setup for time-resolved X-ray absorption measurements in the microsecond time range has been developed at SuperXAS beamline of SLS. It consists of the nanosecond laser (~1W average power, 447 nm or 671 nm wavelength, 5-50 kHz repetition rate), detection system based on avalanche photo diodes that is optimized to measure signals of dilute samples (with concentration ~1mM) and data...
Dr
Buthaina Al-Qaisi
(Iraqi)
18/09/2013, 12:15
poster
Ion Beam Mixing at room temperature of Te/In and Se/In bilayer systems induced by 400 KeV Ar+ ions from Jordan Van De Graaff Accelerator with fluences ranging from 1.11x10^14 - 7x10^15 ions/cm2 for Te/In system and 1.35x10^14 - 2.3x10^16 ions/cm2 for Se/In system. The systems are studied by means of AC electrical resistivity measurement, which shows higher mixing efficiency of Se/In system...
Mr
Jun Han
(Postdoc)
18/09/2013, 12:15
poster
New flow-through cells for simultaneous UV-Vis/SAXS measurements of liquid samples are designed. For concentration or pH-dependent experiments, multiple sample solutions can be injected. A quick and precise temperature control of the sample in the range from 0 to 80 °C is foreseen. The cell will be compatible with an on-axis microscope, facilitating precise sample positioning and for observing...
Dr
Peter Modregger
(Swiss Light Source, Paul Scherrer Institut, Switzerland)
18/09/2013, 12:15
poster
Grating interferometry (GI) constitutes a recently established phase contrast x-ray imaging technique that provides a particular high sensitivity towards density variations in the sample. For this reason, GI is especially suitable for imaging subtle differences in soft tissues, which resulted in an ever increasing interest from the biomedical researchers. Until recently, the experimental...
Julie Louise Fife
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Non-destructive synchrotron-based x-ray tomographic microscopy is ideal for studying various materials systems in three and four dimensions, and the TOMCAT beamline of the Swiss Light Source is one of the premier beamlines in the world for such experiments. Spatial resolution ranges from 1-10 µm with fields-of-view from 1-22 mm, and temporal resolution is as fast as 0.1 s for full 3D data...
Dr
Urs Gasser Gasser
(Laboratory for Neutron Scattering, Paul Scherrer Institut)
18/09/2013, 12:15
poster
We present a small angle X-ray scattering study of crystals formed by temperature-sensitive, swollen microgel particles consisting of poly(N-isopropylacrylamide) co-polymerized with acrylic acid and 5 mol% of cross-linker. As for hard spheres, the random hexagonal close packed structure is predominant during crystal growth and slowly transforms towards the face-centered cubic structure....
Dr
Christopher Milne
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
With their unique combination of high per-pulse X-ray flux and femtosecond pulse durations, hard X-ray free electron lasers are an almost ideal source for time-resolved structural experiments. The SwissFEL, which is currently under construction at PSI, will be capable of generating femtosecond hard x-rays pulses in the photon energy range of 2-12 keV, with a planned emphasis on performing...
Mr
Kevin Mader
(Paul Scherrer Institute)
18/09/2013, 12:15
poster
3D tomography has enabled the probing and imaging of biological processes at previously unachievable temporal and spatial resolutions[1]. At these scales, many types of samples have tens of thousands of substructures with complicated patterns of spatial positioning, orientation, and shape. An examination of these structures provides insight into the underlying processes which drive growth,...
Dr
David Haberthür
(TOMCAT, Swiss Light Source, Paul Scherrer Institut)
18/09/2013, 12:15
poster
The difficulty of characterizing individual respiratory functional units of the lung from two-dimensional physical sections leads to a limited knowledge about biological parameters like volume and surface of these so-called acini. The three-dimensional architecture of the acini has a strong influence on ventilation and particle deposition.
We developed a method to semi-automatically extract...
Annabelle Medebach
(Paul Scherrer Institut)
18/09/2013, 12:15
poster
Food microstructure is one of the most important parameter when it comes to sensorial perception of food. Accordingly, changes of the microstructure over time typically lead to a loss in product quality. The mechanisms behind these changes are not yet completely understood, mostly due to a lack of experimental methods to directly observe the structural modifications. We are using synchrotron...
Dr
Federica Marone
(Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland)
18/09/2013, 12:15
poster
The TOMCAT beamline at the Swiss Light Source has established itself as a cutting edge hard X-ray tomographic microscopy endstation for experiments on a large variety of samples, such as new materials, biomedical tissues and rare fossils.
We present an overview of the hardware and techniques available to the user community. Absorption and phase contrast imaging with an isotropic voxel size...
