Conveners
Parallel 4: Material Science 1
- Ralph Gilles
Parallel 4: Soft Matter 1
- Henrich Frielinghaus (JCNS)
Parallel 4: Detectors
- Wiebke Lohstroh
The heteroanionic approach for the design of materials has led to variety of novel systems with unique properties. In particular, heteroanionic hydrides emerged with promising properties themselves. Over the recent years such compounds, in particular hydride fluorides have been thoroughly investigated as potential host materials for rare earth activated luminescence.
Here, the...
The advent of the new spallation sources as well as the various major upgrade programmes of existing facilities have given great impetus to the new and further development of neutron detection techniques for neutron scattering applications in the last decade. Great progress has been made, particularly in the area of count rate capability and large detection areas.
With regard to the projects...
We study vacancy-type defects in tungsten mono-crystals using positron annihilation Doppler-broadening and lifetime spectroscopy. These studies are part of nuclear fusion research necessary to predict the durability of reactor walls.
The waterborne latex films, obtained from the dispersions of latex particles are of particular interest due to the non-content of volatile organic compounds (VOC), which is often mandatory under environmental legislation [1]. However, abrupt water penetration inside the films restricting their lifespan and deteriorating the shining of the coating, limiting their uses [2]. In order to prepare...
The electric field driven assembly of highly crosslinked ionic microgels at effective volume fraction, ϕeff=0.04 is studied using a confocal microscope. The isotropic microgels undergo structural transitions depending on the field strength and microgel concentration. At low ϕeff, the ionic microgels interact via long-range Yukawa type interaction and the interparticle separation between...
Anode free batteries are designed to significantly decreases the weight of a cell.They necessitate immaculate reversibility of the charge
and discharge process, as no further lithium other than the amount loaded into the cathode is available. Homogeneous plating and
stripping of lithium onto a current collector is not readily achieved when plating on e.g. on copper. Lithiophilic metals like...
Event mode neutron imaging detectors generate information for every neutron hitting the detector individually. This allows the usage of algorithms to analyze the individual events and improveme noise supression as well as temporal and spatial resolution. The detector have already been tested sucessfully for fast, thermal and cold (ToF) imaging, and neutron diffraction.
High-resolution neutron radiography requires an imaging system capable of detecting the exact location of the absorbed neutrons in the scintillator screen. This is realized by a sensitive CMOS camera with high frame rate capabilities and an image intensifier, which is able to amplify the weak light output created by individually absorbed neutrons. Identifying and recording single neutron...
Nanoparticles are nowadays widely used in biology and have quickly emerged as essential to modern medicine. When nanomaterials come into contact with biological membrane, their interaction with biomacromolacules and biological barriers will determine their bioactivity, biological fate and cytotoxicity. It goes without saying that understanding the interaction between nanomaterial and...
The single crystal diffractometer POLI is dedicated to diffraction using polarized neutrons and can additionally host bulky sample environments. Currently, three standard setups are implemented on POLI: zero-field spherical neutron polarimetry, flipping ratio method with high magnetic fields and non-polarized diffraction under various special conditions. Here we reported our recently...
Neutron and X-ray scattering experiments are powerful techniques to investigate any material at the atomic to mesoscopic level. They give us structural and dynamic information. However, it is not possible to extract the relative position, shape, and velocity of the scatterers directly from the scattering data due to the phase problem. One possibility to circumvent this problem is to simulate...
High voltage spinel LNMO is one of the most promising next-generation cobalt-free cathode materials for Li-ion batteries. Besides the typical compositional range of LixNi0.5Mn1.5O4 (0 < x < 1) in the voltage window 4.90 to 3.00 V, additional Li can be introduced into the structure in an extended voltage range to 1.50 V. Theoretically, this leads to significant increase of the specific energy...
Materials based on semi-crystalline polymers are used in different fields of applications, from high temperature to plastics, elastomers and fibers, from biomedicine to aerospace, from oil industry to fuel cells. Such materials exhibit a phase separation in crystalline and amorphous regions. The crystalline domains are characterised by a complex morphology spanning a broad length scale from Å...
By utilizing time-of-flight neutron reflectometry (ToF-NR) under different relative humidity, we demonstrate that polymer brushes constituted by hydrophilic cyclic macromolecules exhibit more compact conformation with lower roughness compared to linear brush analogues, due to the absence of dangling chain ends extending at the interface. [1] In addition, due to increased interchain steric...
