Materials Literature
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Based on the dehydrogenation mechanism of heavy paraffins under industrial conditions, the intrinsic reaction kinetic model and catalyst deactivation model were established considering the influence of side reactions with different carbon‐number heavy paraffins. Based on the experimental data of dehydrogenation reacti…
Photoluminescence (PL) and electrical properties of boron doped zinc oxide (ZnO) thin films, deposited by metalorganic chemical vapour deposition on a glass substrate, were investigated. The effects of annealing in air, as well as the influence of the radiofrequency—plasma treatment in hydrogen atmosphere, on the PL a…
Polystyrene (PS) commonly exhibits brittle behavior and poor mechanical properties due to the presence of structural heterogeneities promoting localized failure. The removal of this localized failure is shown here by processing PS into fibers with a range of diameters using electrospinning. Mechanical properties of in…
In the present work, different synthesis methods i.e., sol-gel method, glycine-nitrate method and solid state route have been used to synthesize lanthanum strontium cobaltite (LSCO), which is utilized as cathode in low and intermediate temperature solid oxide fuel cell (SOFC). Calcination temperature for LSCO has been…
The modification of the radiative efficiency of meta-atoms, as the basic building blocks of a metamaterial surface, in a confined environment is presented and discussed. We demonstrate the substantial influence on their radiative lifetime in the terahertz regime when they are arranged in densely packed super-cells. Th…
We have analyzed the temperature and time dependences of the photoconductivity response of SrTiO3 single crystals and thin films. We observe a sharp increase in photoconductivity at 35 K and infrared quenching of the photocurrent below this temperature. We use a simple two-level sensitization model to show that the lo…
Ceramic matrix composite (CMC) have higher temperature capability and lower density than nickel based alloys which have been used for hot section components of gas turbine engines. These properties are expected to bring many benefits, such as higher turbine inlet temperature (TIT), reduction of cooling air, and reduct…
ABSTRACT The enzyme catalyzed polymerization of flame retardant (FR) polymers from the renewable resource 2‐(4‐hydroxyphenyl) ethanol (HPE), commonly known as tyrosol, is presented. The synthesis is environmentally friendly and requires only monomer, peroxidase catalyst, dilute hydrogen peroxide, and deionized water.…
Nucleation, nucleus number densities, and the respective supersaturation dependence, crystal growth and Ostwald ripening are reconsidered from the energetics perspective. Supersaturation-dependent critical nucleus sizes are calculated accordingly. It is argued that the logistic time-dependent nucleation resembles one…
We present a mean-field theory describing the influence of long-range dipolar forces on the temperature transition from the paramagnetic to ordered phases in frustrated Heisenberg spiral magnets. It is shown that the dipolar interaction produces a cascade of first- and second-order phase transitions between the parama…
Transport measurements on the two-dimensional electron system in $\mathrm{A}{\mathrm{l}}_{2}{\mathrm{O}}_{3}\text{/}\mathrm{SrTi}{\mathrm{O}}_{3}$ heterostructures indicate significant noncrystalline anisotropic behavior below $T\ensuremath{\approx}30\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Lattice dislocations in $\m…
Angiogenesis of an implanted tissue is one of the most important issues in skin repairment. Porous bFGF-immobilized silk fibroin (bSF) scaffolds was fabricated by freeze drying using EDC agent crosslinking bFGF and SF with an aim of controlling bFGF delivery for the revascularization improvement. The bSF scaffolds ret…
A Multiple Model Adaptive Control (MMAC) methodology is used to control the critical parameters of a Solid Oxide Fuel Cell Gas Turbine (SOFC-GT) cyberphysical simulator, capable of characterizing 300kW hybrid plants. The SOFC system is comprised of a hardware Balance of Plant (BoP) component, and a high fidelity FC mo…
Foreign object damage (FOD) behavior in 3-D woven SiC/SiC composites of three different fiber architectures were characterized at ambient (21 °C) and high temperatures (1100 °C) using tungsten carbide projectiles impacted at approximately 350 m/s. Non-destructive evaluation (NDE) techniques such as electrical resistan…
The present work deals with the analysis of operational concepts for a SOFC/MGT hybrid power plant based on a test rig at the DLR, Institute of Combustion Technology. Here, a Turbec T100 micro gas turbine and a fuel cell emulator are used. The emulator is composed of two pressure vessels. The first represents the cath…
Reduced graphene oxide-carbon nanotube (rGO-CNT) and anatase TiO2-Li4Ti5O12 (ATO-LTO) composite electrodes were synthesized via electrostatic spray deposition (ESD) and analyzed as cathode and anode vs. lithium, respectively. The rGO-CNT and ATO-LTO electrodes were able to deliver discharge capacities of ca. 63 mAhg -…
Scalable direct graphene patterning and functionalization approaches, which are essential to harness the excellent physical properties of graphene for various biological, chemical, electronic, and optical device applications, are demonstrated in this study. These are achieved by employing simple scalable affordable el…
High temperature fuel cells have been studied as a suitable solution for Carbon Capture and Storage (CCS) purposes at a large scale (>100 MW). However, their modularity and high efficiency at small-scale make them an interesting solution for Carbon Capture and Utilisation at the distributed generation scale when co…
A promising technology solution to meet the demands for highly efficient and clean CHP systems with the highest load and fuel flexibility is the SOFC/MGT hybrid power plant concept (HPP). In this concept, a solid oxide fuel cell (SOFC) is combined with a micro gas turbine (MGT) to use the hot and low-caloric SOFC off-…
The high-mobility 2 dimensional electron gases formed at the interfaces between certain insulating perovskite oxides have known to be a playground of exotic physical orders like superconductivity and ferromagnetism and their inter-coupling. There have been efforts to accomplish electronic confinement at such interface…