Materials Literature
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The optical absorption of defect centers in SrTiO3 substrates grown by the Vernuil method are investigated using photoinduced electron paramagnetic resonance (photo-EPR) at room temperature. As received samples revealed EPR signatures for Fe3+, Cr3+, Mn4+, and an iron-oxygen vacancy complex, Fe3+VO. An anneal in dry o…
We have previously demonstrated a fabrication technique for the creation of silicon wire grid polarizers (WGPs) for far (deep) ultraviolet applications utilizing a shear-aligned cylinder-forming polystyrene-b-poly(n-hexyl methacrylate) diblock copolymer as a mask for reactive ion etching of an amorphous silicon substr…
It is shown, by DFT calculations, that the uniform functionalization of the upper layer of graphite by hydrogen or fluorine does not change essentially its bonding energy with the underlying layers, whereas the functionalization by phenyl groups decreases the bonding energy by a factor of approximately ten. This means…
An interfacial buffer layer has been developed to improve the silicon oxide (SiOx) hard coating adhered to a flexible plastic substrate through a consecutive plasma-enhanced chemical vapour deposition process, using the same organosilicon precursor. The adhesion of the hard coating structure, correlated with the buffe…
The structure and magnetic properties were studied for bulk nanocrystalline SmCo5 sintered magnet produced by spark plasma sintering technique. X-ray diffraction patterns show that the sintered magnet exhibits CaCu5 crystal structures. Transmission electron microscopy (TEM) observation indicates the average grain size…
In this study, the influence of the addition of carbon nanotube (CNT) (0, 0.5, 1.0, and 2.0 wt %) on complex permittivity, complex permeability, and reflection loss for La0.7Sr0.3MnO3−δ (LSMO)/polymer composites was investigated. Microwave absorbing composites were prepared by molding and curing a mixture of LSMO powd…
Blockcopolymere aus Poly(carboxybetain) (PCB) und Poly(milchsäure-co-glycolsäure) (PLGA) mit tBu-Gruppen als Teil der PCB-Monomere bilden außergewöhnlich stabile PLGA-Kern/PCB-Schale-Nanopartikel, die aufgrund der COO−-Gruppen in der PCB-Schale ein hohes Funktionalisierungspotenzial aufweisen (siehe Bild; EDC=1-Ethyl-…
In the present work, polyamide-Mg(OH)2 nanocomposites were prepared via melt intercalation on a twin-screw extruder. Different particle sizes (24, 20, 11 nm) of Mg(OH)2 were synthesized by in-situ deposition technique and its shape and sizes was confirmed on transmission electron microscope (TEM). Nano-Mg(OH)2 was add…
In-situ TOPO decomposition was accomplished by applying a vacuum at elevated temperatures to a precursor solution in the presence of oxygen, leading TOPO to oxidize to di-n-octylphosphinic acid (DOPA) and octylphosphonic acid (OPA). The mixed ligand system of tetradecylphosphonic acid (TDPA), DOPA and OPA produced CdS…
In this work, normal blends, microfibrillar blends and composites were prepared from low density polyethylene (LDPE) and poly(ethylene terephthalate) (PET) in 85/15 and 75/25 w/w% ratio in the presence and absence of a compatibilizer polyethylene grafted with maleic anhydride (PE-g-MA). The microfibrillar composites (…
Natural rubber compounds with untreated and treated kenaf were prepared with different loading i.e., 0, 10, 20, 30 and 40 phr. The compounds were cured at 150°C according to its cure time, t90. Curing characteristics, tensile properties, rubber-filler interaction and morphology properties of the rubber compounds were…
Many Ge-based chalcogenide alloys, including GeTe, exhibit a reversible amorphous-to-crystalline phase change that is the basis for a wide range of current and next-generation technologies. Solution routes are attractive alternative strategies for synthesizing these materials, because they have the potential to impart…
Titrations of commercial diaminobutane (DAB) and polyamidoamine (PAMAM) dendrimers by vitamins C (ascorbic acid, AA), B(3) (nicotinic acid), and B(6) (pyridoxine) were monitored by (1)H NMR spectroscopy using the chemical shifts of both dendrimer and vitamin protons and analyzed by comparison with the titration of pro…
We report high exchange current densities exceeding 1 A cm(-2) at Pt nanostructures on Au(111) for hydrogen-related reactions. Such activity is found at Pt nanoparticles with a coverage of less than 10 % of a monolayer on Au(111) and on single Pt particles deposited on Au(111). Potential pulse technique as well as mic…
Mn-doped Bi(Mg1/2Ti1/2)–PbTiO3 disordered ferroelectric ceramics were studied under ac electric fields and a crossover from a nearly constant loss to a superlinear power-law behavior was observed. Our results confirmed that the nearly constant loss behavior also exists in disordered ferroelectrics. The exponent of the…
Landau theory and symmetry considerations lead us to propose an explanation for several seemingly paradoxical behaviors of charge ordering (CO) and spin ordering (SO) in the mixed valence compound ${\text{LuFe}}_{2}{\text{O}}_{4}$. Both SO and CO are highly frustrated. We analyze a lattice gas model of CO within mean-…
Abstract Organocatalysis has emerged during the last decade as a concept with a significant number of synthetic applications. Important driving forces for this growth are that organocatalytic strategies often operate at rather mild reaction conditions, with reduced waste formation, and that processes may lead to high…
Using x-ray absorption spectroscopy and x-ray magnetic circular dichroism, we performed an element-specific investigation of the spin magnetic moments $({m}_{\text{spin}})$ of Mn and Co of ${\text{Co}}_{2}\text{MnSi}$ ultrathin layers grown on an Fe underlayer to stabilize the ferromagnetism and facing an MgO barrier.…
A recently developed thermal lens spectrometry configuration has been used to study CdSe/ZnS core-shell quantum dots (QDs) suspended in toluene and tetrahydrofuran (THF) solvents. The special features of this configuration make it very attractive to measure fluorescence quantum yield (η) excitation spectrum since it s…
We use classical molecular-dynamics simulations to examine the strain-rate sensitivity of single-crystalline and twinned Au nanowires (NWs) with a diameter of 12.3 nm deformed in tension at temperatures between 10 K and 450 K. It is found that the strain-rate sensitivity above 100 K is significantly smaller in twinned…