Materials Literature
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Thin coatings applied to metals is a material-saving process to improve the surface properties such as abrasion and corrosion resistance of the substrate. Pure inorganic coatings are generally too thin to offer long-term protection, and thick coatings are prone to crack formation during processing. However, by incorpo…
The article includes the developed methods of natural graphite modification for its effective use as a cathode material of lithium power sources. It was determined that nanohybridization of thermally expanded graphite with organic thiourea increases the energy capacity Li + - intercalation galvanic reaction. This pape…
The effective approach to control the lyophilic properties of aluminium surface by obtaining of grafted polymers and block-copolymers capable to reversible change the wettability in a broad range at variation of pH and temperature is suggested.
圆光斑激光冲击强化条件下由于冲击边界产生反向塑性加载效应，会产生“残余应力洞”现象。对TC47、1Cr11Ni2W2MoV、LY2和K417等4种材料进行圆光斑单点激光冲击试验，通过显微硬度和残余应力测试验证了“残余应力洞”的存在，并分析了激光功率密度和强化次数等参数对“残余应力洞”现象的影响。为了抑制“残余应力洞”对强化均匀性的影响，以TC17为对象，优化光斑搭接工艺并开展多遍强化试验，结果表明，与单个光斑强化相比，同样激光参数下，采用特殊光斑搭接和多遍强化可以有效抑制圆光斑残余应力洞现象，提高强化效果均匀性，残余应力和显微硬度平均值分别提高60MPa和30HV0.2，极值差分别降低了70MPa和94HV0.2。
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…