Materials Literature
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A sample of potassium arsenojarosite was synthesized and thoroughly characterized. The obtained sample is a solid solution of potassium arsenojarosite, whose approximate formula is [K0.75(H3O)0.25 ]Fe1.84[(SO4)1.82(AsO 4)0.18][(OH)2.34(H 2O)3.66]. The decomposition process in alkaline medium was studied in the inducti…
Although carbon has been recognized to be insoluble in gallium, we found that the outermost surface of gallium has unexpectedly high carbon solubility, particularly the limited region of about a few nanometers in depth. Our in-situ transmission electron microscope observations revealed that a graphene layer was precip…
In the last years Anomalous Small-Angle X-ray Scattering became a precise quantitative method resolving scattering contributions two or three orders of magnitude smaller compared to the overall small-angle scattering, which are related to the so-called pure-resonant scattering contribution. Additionally to the structu…
Successful experiments on high, medium and low density natural fiber reinforced composites made from tannin/hexamine resin and flax–hemp fibers have recently been carried out. This study focused on the high density composites. In this work composite panels have been made of three different tannin extracts: mimosa, sul…
Novel methyl vinyl silicone rubber (MVQ)/calcium sulfate whisker (CSW) composites had been prepared. Two types of modification agents, hydrogen silicone oil and silane coupling agent, were used in the preparation of modified calcium sulfate whiskers (MCSW). The morphology and properties of MCSW were analyzed by Fourie…
Biodegradable multiblock copolymers poly(butylene succinate-b-poly(ethylene glycol) succinate) (P(BS-b-PEGS)) were prepared by direct polycondensation. The thermal and crystallization behavior of P(BS-b-PEGS) with weight fraction of PEGS component from 6 to 26 wt % were comparatively investigated with those of neat po…
A new family of biodegradable and functional amino acid-based poly(ester amide)s (AA-PEAs) have been designed and synthesized as a new generation of biodegradable biomaterials for biomedical applications. This paper provides an overview of this new generation of biodegradable biomaterials, their design strategy, synth…
Preparation of alumina and aluminium-cerium oxide microspheres was carried out by internal gelation process. The gelation behaviour of an acid deficient aluminium nitrate solution (NO3 −/AI3+ = 2.5) with hexamethylenetetramine and urea was investigated to develop a gelation field diagram. However, cerous nitrate solut…
The polycaprolactone (PCL) known for its slow biodegradability shows potential applications in the fleld of skin scafiold production. In the current study PCL mats with micro scaled structure were produced via electrospinning and treated with NaOH solution for enhanced cell adhesion. The scafiolds were evaluated as an…
Abstract New electron-microprobe analyses of mayenite from the Ettringer Bellerberg volcano near Mayen in the Eifel district, Germany have high Cl contents and Raman spectroscopy indicates the presence of OH groups. Neither of these components is included in the generally accepted chemical formula, Ca 12 Al 14 O 33 .…
In this paper, we report a method of precise and fast absolute x-ray energy calibration over a wide energy range using an iterative x-ray diffraction based method. Although accurate x-ray energy calibration is indispensable for x-ray energy-sensitive scattering and diffraction experiments, there is still a lack of eff…
We synthesized various kinds of manganese borides by liquid-solid reaction from manganese and amorphous boron powders at high pressure and high temperature. The mixed powders with various atomic ratio of boron to manganese, B/Mn = 0.6, 1.2, 2, 3, 4, 8, were treated at temperature 1100–1350 °C and pressure 4.8-5.5 GPa,…
Insulation systems have to interact with their environment. In outdoor applications they have to withstand atmospheric stress such as temperature and humidity. This leads to aging processes inside the insulation material and results in a change of material properties and consequently can lead to a failure of the high…
Molecular dynamics simulations are performed to study size effects on the impact response of copper nanobeam targets subjected to impacts by copper nanobeam flyers with different impact velocities. It is found that the Hugoniot response is size-dependent, while the aspect ratio – that is, the ratio of flyer and target…
Partial Discharge (PD) measurements are considered as a very powerful technique for testing and monitoring the condition of high-voltage (HV) insulations. PD activity is generally accepted as an early breakdown indicator, which is also reflected in numerous standards. In the present contribution, the authors describe…
Molecular dynamics simulations of two-dimensional soft Yukawa fluids are performed to analyze the effect that the range of interaction has on coexisting densities and line tension. The attractive one-component fluid and equimolar mixtures containing positive and negative particles are studied at different temperatures…
Abstract Kazanskyite, Ba & TiNbNa 3 Ti(Si 2 O 7 )2O 2 (OH) 2 (H 2 O) 4 , is a Group-III TS-block mineral from the Kirovskii mine, Mount Kukisvumchorr, Khibiny alkaline massif, Kola Peninsula, Russia. The mineral occurs as flexible and commonly bent flakes 2–15 μm thick and up to 330 μm across. It is colourless to…
We demonstrate a method to tune the carrier concentration of a high temperature superconductor over a wide range, using an applied electric field. Thin film devices were made in an electrical double layer transistor configuration utilizing an ionic liquid. In this way, the surface carrier density in La2−xSrxCuO4 films…
In this paper, we examine carbonyl iron composites in silicone rubber and epoxy matrices. Transmission measurements were performed at W (70 to 110 GHz) and Ka (26 to 40 GHz) bands and effective permittivity and permeability of composites with 10% volume fraction of carbonyl iron powder (CIP) were extracted at these fr…
With a metamaterial structure, the phenomenology observed in quantum electromagnetically induced transparency is reproduced. Through the parametric comparison between quantum and classical systems, the physical mechanism of this novel phenomenon has been explained directly in our analysis. In addition, we use another…