Materials Literature
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In 1910 Ivar Bang reported that concentrated solutions of guanylic acid formed a gel. It took half a century before Gellert et al. in 1962 discovered the structural motif, a guanine-quartet, to be the basis for guanylic acid gelation. This chapter starts with a historical overview and gives credit to Ivar Bang and sev…
Diese Arbeit beschaftigt sich mit der Synthese von Feststoffen im Rahmen des Konzeptes der rationalen Syntheseplanung. Ziel ist die experimentelle Verifikation theoretisch vorhergesagter Strukturkandidaten. Dazu gehort die Untersuchung von Keimbildung, Kristallisation und Phasenumwandlungen der Verbindungen, die mitte…
Advances in synthesis are imperative if graphene is to fulfill its scientific and technological potential. Single crystal graphene of is currently available only in the small flakes generated by mechanical exfoliation. Layers of larger size may be grown either by the thermal decomposition of SiC or by chemical vapor d…
The goal of this doctoral work was to observe and analyze the stability and dynamics of phospholipid-encapsulated microbubbles, and in particular the reaction to sudden submersion in a multi-gas medium. To accomplish this goal, first an experimental technique was developed to observe a microbubble in a single-gas envi…
Fundamental mechanisms determining the structure formation of nanocomposite TiC-/a-C:H thin films synthesised by reactive magnetron sputtering techniques have been studied. The investigation entail ...
This study investigated molecular genetic aspects of the growth of the chemolithoautotrophic acidophile Acidithiobacillus ferrooxidans ATCC 23270 in anaerobic growth conditions using S and Fe as electron donor and acceptor respectively. A gene denominated fnrAF was identified in the genome of A. ferrooxidans that is p…
The resistance of acetylated rattan against soft rot and other soil inhabiting micro-organisms was compared to beech and Scots pine woods. Calamus manan grown under rubber tree canopy aged 10 and I3 years was acetylated to different levels by reaction times (0.25 to 30 hour) and was tested to soft rot decay for 32 wee…
The article considers the influence of various surfactants on the structure formation of cement compositions. It is shown that the nature of the functional groups (OH, COOH, SO3H) determines the amount of the phase composition distortion in the modified cement.
There were recent studies suggesting that nano-carbon materials could enhance the crystallinity development or the charge mobility of conjugated polymers. It is highly tempting to speculate that the enhanced charge mobility might be a result of morphological changes in the matrix polymer. By use of wide-angle X-ray sc…
When the initial reaction temperature is low, the oxidation process of alkanes with three or more carbon atoms is characterized by the low temperature oxidation (LTO) process. This process is controlled by RO2 Chemistry and H₂O2 Chemistry (Route 1). When the initial temperature is higher than LTO end temperature, the…
LiBH4 is a potential hydrogen storage material and gains lots of interests recently due to its extremely high hydrogen capacity (18.4 wt%). However, the initial decomposition (Ti) and main dehydrogenation temperatures (Tm) of LiBH4 are as high as 560 and 750 K, respectively. In order to overcome the drawbacks, several…
The article studies the influence of Si-wafers processing in acid-peroxide and ammonia-peroxide solutions on the temporary stability of the electronic states of the crystal surfaces before formation of the nanostructured and porous silicon layers. A characteristic parameter of stability of the electrical properties of…
The thesis mainly focuses on the spatially resolved characterization of a direct methanol fuel cell. Initially spatially resolved analyses were carried out on an end of life (5000 hrs operated) stack membrane electrode assembly (MEA) using various techniques, like X-ray diffraction (XRD), transmission electron microsc…
Tissue engineering is an emerging strategy in medical field that focuses on regeneration or replacement of lost or damaged tissue and organs. Most of the tissues in human body have no or limited self renewal and regeneration potential which decrease with ageing. Today, bone is one of the most transplanted organs of hu…
Effects of redox cycling on the mechanical properties of the Ni-YSZ cermets were investigated by using an in-situ small punch (SP) testing method as a function of porosity, and influence of the redox cycling on the volume expansion of Ni-YSZ cermets was examined by using a thermo-mechanical analysis (TMA) as a functio…
This chapter outlines how the recent advancements in transmission electron microscope instrumentation have provided new opportunities for high resolution characterisation of inorganic nanoparticle systems. Concentrating on the smallest nanoclusters, nanocrystals and nanoparticles with diameters of 1–50nm we outline ho…
Materials exhibiting new functionalities due to interdependent electric (e.g. conductivity) and magnetic properties are potentially interesting for spintronics applications. We have investigated electronic and magnetic properties by means of x-ray spectroscopies and SQUID magnetometry in several magnetic materials, of…
Resumen del póster presentado al American Physical Society March Meeting celebrado en Boston (US) del 27 de febrero al 2 de marzo de 2012.-- et al.
Ce travail a pour but l'etude des proprietes structurales, dynamiques et thermodynamiques de l'alliage Au-Si dans l'etat liquide et surfondu. Nous avons utilise des simulations de dynamique moleculaire pour determiner ces proprietes. Les interactions interatomiques necessaires a ces simulations ont ete construites dan…
Based on the analysis of theoretical and experimental data presented in the literature, the mechanism of electrode processes on the coal anode in the production of aluminium from cryolite-alumina melts is developed. The proposed mechanism can explain the composition of the anode gas and consumption of carbon anodesin…