Materials Literature
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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…
The kinetics of {001}‐oriented Pb(Mg 1/3 Nb 2/3 )O 3 –35 mol% PbTiO 3 (PMN–35PT) single crystals grown by seeded polycrystal conversion were systematically quantified as a function of excess PbO liquid phase. The coarsening behavior of the corresponding matrix grains was similarly quantified. Single‐crystal seed plate…
This paper describes a novel method to separate the leakage current, obtained in polymeric materials during a salt fog aging test, into three components of conductive current, corona discharge current and dry band arc discharge current. First, we investigated that the relationship between optical emissions due to disc…
The directional energy flow and intense light emission of the nanostar dendrimer (C 460 H 424 ) that consists of phenylacetylene oligomers and a perylene molecule are studied from the viewpoint of molecular orbital interactions. The method of choice in the present study is the density functional theory and the simple…
The yttrium–sialon ceramics with the composition of Y 0.333 Si 10 Al 2 ON 15 and an excess addition of Y 2 O 3 (2 or 5 wt%) were fabricated by hot isostatic press (HIP) sintering at 1800°C for 1 h. The resulting materials were subsequently heat‐treated in the temperature range 1300–1900°C to investigate its effect on…
Abstract The 1:2 adduct lead(II) complexes with 1, 10‐phenanthroline (phen) containing three different anions, [Pb(phen) 2 (CH 3 COO)X] (X=NCS — , NO 3 — and ClO 4 — ), have been synthesized and characterized by CHN elemental analysis, IR‐, 1 H‐ and 13 C NMR spectroscopy. The structure of [Pb(phen) 2 (CH 3 COO)(ClO 4…
Abstract Material surface properties of polymers, plastics, ceramics and textiles can be modified by atmospheric or low‐pressure glow discharge plasma. The aim of the present work is to study the surface modification of biaxially oriented polypropylene (BOPP) film in order to improve its hydrophilic and wetting proper…
An anisotropic metamaterial, based on a transmission line (TL) approach, that exhibits positive refractive index (PRI) in one direction and negative refractive index (NRI) in another (orthogonal) direction is presented, characterized and demonstrated in terms of analytic dispersion diagrams, equivalent refractive inde…