Materials Literature
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We present results from dielectric spectroscopy on four molecular glass-formers, both in bulk and in confined geometry. For systems exhibiting a well-resolved secondary (β) relaxation, the confinement induces a relative enhancement (compared to the main α relaxation) of the effective dielectric strength of the β proce…
This study was undertaken to investigate the influence of Nb and V alloying elements and manufacturing conditions on the microstructural behaviour and mechanical characteristics of HSS (high speed steel) roll manufactured by a VCC (vertical centrifugal casting) process. In the Fe - 2C - 6Cr-1.5W - 3Mo - 4V alloy, the…
We synthesized spinel ZnAl 2 O 4 film on α‐Al 2 O 3 substrate using a solid‐phase reaction between the pulsed‐laser‐deposited ZnO film and α‐Al 2 O 3 substrate. Auger electron spectroscopy showed that the atomic distribution in the spinel ZnAl 2 O 4 was inhomogeneous, which indicated that the reaction was diffusion co…
The metal-insulator transition (MIT) of the Magnéli phase V 4 O 7 is studied by means of electronic-structure calculations using the augmented spherical wave method. The calculations are based on the density-functional theory and the local density approximation. Changes of the electronic structure at the MIT are discu…
The structure and transport properties of LaTiO3+x epitaxial thin films grown on (001) SrTiO3 by pulsed-laser deposition is examined. Four-circle X-ray diffraction indicates that the films possess the defect perovskite LaTiO3 structure when deposited in vacuum, with the higher X compounds forming at moderate oxygen pr…
We investigated the signaling mechanisms that lead to IL-1beta-induced cell proliferation. Treatment of Balb 3T3 cells with IL-1beta activated two signaling pathways, Erk and Akt. IL-1beta also increased tyrosine phosphorylation of PLC-gamma in Src kinase-dependent manner. Pharmacological inhibition of the PLC-PKC cas…
DNA ligases are important enzymes required for cellular processes such as DNA replication, recombination, and repair. NAD(+)-dependent DNA ligases are essentially restricted to eubacteria, thus constituting an attractive target in the development of novel antibiotics. Although such a project might involve the systemat…
We demonstrate that the incompressibility of spinel Ge 3 N 4 nanocrystals decreases when the pressure is elevated above ∼20 GPa. Ge 3 N 4 nanocrystals initially exhibit a higher bulk modulus of 381(2) GPa. But, above 20 GPa, the bulk modulus is apparently reduced to 268(4) GPa, which is similar to the reported bulk mo…
Recently, we designed a short alpha-helical fibril-forming peptide (alphaFFP) that can form alpha-helical nanofibrils at acid pH. The non-physiological conditions of the fibril formation hamper biomedical application of alphaFFP. It was hypothesized that electrostatic repulsion between glutamic acid residues present a…
This paper presents quantitative analysis of electron emission from nanocrystalline Si dots, and discusses its mechanism based on the calculations of electronic and phononic states. Analysis of emission energy distribution measured from the vacuum level shows that the energy at the peak of the distribution increases l…
The oxygen storage capacity (OSC) of CeO 2 –ZrO 2 solid solutions that were directly formed as nanocrystals by thermal hydrolysis of acidic aqueous solutions of (NH 4 ) 2 Ce(NO 3 ) 6 and ZrOCl 2 at 150°C increased from 94 μmol of O 2 /g for pure CeO 2 to >400 μmol of O 2 /g for compositions of CeO 2 /ZrO 2 with mol…
In this report we show the possibility of broadband low-pass filters with windows of transparency in pre-set spectral ranges. Those filters are based on the unique optical properties of metal-dielectric composites near the percolation threshold. In such composites, metal clusters of different sizes and shapes have dif…
In this paper, we present a combined experimental and computational study of the thermomechanical reliability of multilayer ceramic capacitors (MLCC’s). We focus on residual stresses introduced into the components during the cooling down step of the sintering process. The technique of microindentation turned out to be…
The core and rim of a short prismatic dark brown tourmaline crystal (10 mm in diameter) from a granitic pegmatite near Goslarn, Lower Austria, were structurally and chemically characterized, including H2O determination and Mössbauer analysis. The optimized formula, calculated using chemical and structural data for the…
Abstract Imaging of sub-micron , sub-surface features of thick optically dense materials at high resolution has always been a difficult and/or time consuming task in materials research. For the most part this role has been relegated to technologically complex and expensive instrumentation having highly penetrating rad…
Abstract Two novel tetra‐ and hexahydroxy functionalized perylene chromophores have been used as initiators for the Sn(oct) 2 catalyzed ring‐opening polymerization of different lactones. The arms of the resulting star polymers were comprised of either crystallizable poly( L ‐lactide) or poly( ε ‐caprolactone) arms or…
The wings of the morpho butterfly demonstrate an iridescent blue color over wide viewing angles. The mechanism that generates this blue color is studied. Optical and transmission electron microscopy of the butterfly wings reveal a complex wing structure with as many as 24 layers with periodic structures. The color gen…
Abstract Well‐defined telechelic‐type aromatic polyamides having a secondary amino group and a phenyl ester moiety at each chain end were prepared by the chain‐growth polycondensation of phenyl 4‐(octylamino)benzoate ( 1 ) with initiator 2 ( N ‐ tert ‐butoxycarbonylated 1 ), followed by deprotection of the N ‐protecti…
We present the results of an electron microscopy study of defects in plastically deformed single crystals of the intermetallic ξ′-(Al–Pd–Mn) phase. Pure edge dislocations with two different Burgers vector directions and four different Burgers vector magnitudes were found. All Burgers vector magnitudes observed can be…
Abstract Second‐ and third‐harmonic generation in single‐wall carbon nanotube layers produced by low‐velocity spraying was studied experimentally with the use of amplified 75 fs pulses of Cr:forsterite laser radiation within the range of pump pulse intensities up to the breakdown threshold. Harmonic‐generation process…