Materials Literature
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Abstract 10‐Ethyl‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide ( 1 ) can be nitrated using acetic anhydride and fuming nitric acid. The nitro group is reduced using palladium on charcoal and hydrogen. These reaction conditions are used for the synthesis of an analogous DOPO‐based diaminic hardener ( 7 ). An evaluation of the…
A resist-less nanofabrication method, based on focused ion beam lithography, for connecting and tailoring a nanometer-scale planar device in ultrathin graphitic disks is demonstrated by producing 50-nm-wide double side-gated transistor devices (see image). Experiments and theory suggest that the behavior of the nanori…
We have studied the effect of Fe addition on the structural and magnetic transitions in the magnetic shape memory alloy Ni-Mn-Ga by substituting systematically each atomic species by Fe. Calorimetric and ac susceptibility measurements have been carried out in order to study the magnetic and structural transformation p…
We analyze the electrostatic interactions between a single graphene layer and a ${\text{SiO}}_{2}$ substrate, and other materials which may exist in its environment. We obtain that the leading effects arise from the polar modes at the ${\text{SiO}}_{2}$ surface, and water molecules, which may form layers between the g…
We present and discuss the results of the calculations of surface relaxation and rumpling on ${\text{SrTiO}}_{3}$ (001) and (011) surfaces. We consider both SrO and ${\text{TiO}}_{2}$ terminations of the (001) surface, and three terminations (Sr, TiO, and O) of the polar (011) surface. The calculations are based on hy…
Cu-doped ZnO nanowires exhibiting high sensitivity to both UV and visible light are prepared by a vapor–liquid–solid method. The nanowires are highly resistive in the dark but exhibit several orders of magnitude enhancement in photoconductivity under UV and white-light irradiation because of an avalanche-type photocar…
Fibrils or spheres? Spider silk proteins belong to the class of natively unfolded proteins. Depending on the experimental conditions, these proteins form nanofibrils or microspheres following two distinct aggregation pathways. A detailed model describes the assembly mechanism of spider silk proteins into microspheres.
The effect of Si 3 N 4 , Ta 5 Si 3 , and TaSi 2 additions on the oxidation behavior of ZrB 2 was characterized at 1200°–1500°C and compared with both ZrB 2 and ZrB 2 /SiC. Significantly improved oxidation resistance of all Si‐containing compositions relative to ZrB 2 was a result of the formation of a protective layer…
In this study, we report the observation of a pseudogap associated with the insulator-metal transition in compositions of Pr$_{1-x}$Sr$_x$MnO$_3$ system with no charge ordering. Our valence band photoemission study shows that the observed shifts in the near Fermi level density of states are abrupt at the Curie transti…
The electron-transport properties of single-row monoatomic nanowires made of 5$d$ elements are examined by first-principles calculations based on the density functional theory. We found that oscillation patterns with a period longer than two-atom length are dominant in the conductance of Ir and Pt monoatomic nanowires…
Using valence band photoemission we have demonstrated the presence of a pseudogap in the near Fermi level electronic spectrum of some of the mixed phase compositions of Sm$_{1-x}$Ca$_x$MnO$_3$ system. The pseudogap was found to grow in size over a large region of the phase diagram of this system, finally leading to a…
We present a comparative full-potential study of generalized Kohn-Sham schemes (gKS) with explicit focus on their suitability as starting point for the solution of the quasiparticle equation. We compare $G_0W_0$ quasiparticle band structures calculated upon LDA, sX, HSE03, PBE0, and HF functionals for exchange and cor…
Silver (Ag) nanoparticles have unique plasmon-resonant optical scattering properties that are finding use in nanomedical applications such as signal enhancers, optical sensors, and biomarkers. In this study, we examined the chemical and biological properties of Ag nanoparticles of similar sizes, but that differed prim…
The effect of natural organic matter (NOM) characteristics and water quality parameters on NOM adsorption to multiwalled carbon nanotubes (MWNT) was investigated. Isotherm experiment results were fitted well with a modified Freundlich isotherm model that took into account the heterogeneous nature of NOM. The preferent…
This review summarizes the results of past research on films and coatings from hemicelluloses, biopolymers that are as yet relatively unexploited commercially. The targeted uses of hemicelluloses have primarily been packaging films and coatings for foodstuffs as well as biomedical applications. Oxygen permeability of…
This article briefly reviews recent applications of phase‐field method to ferroelectric phase transitions and domain structures in thin films. It starts with a brief introduction to the thermodynamics of coupled electromechanical systems and the Landau description of ferroelectric transitions in homogeneous ferroelect…
Abstract A new Anderson‐type heteropolyanion‐supported nickel imidazole complex, [Himi] 2 [Ni(imi) 3 (H 2 O){Ni(OH) 6 Mo 6 O 18 }]·2H 2 O (imi = imidazole) ( 1 ) has been prepared by conventional aqueous solution synthesis and structurally characterized by single‐crystal X‐ray diffraction as well as by infrared spectr…
Abstract Effects of various Cr and B sources and preheating conditions on the high temperature synthesis of chromium orthoborate were studied. Precursors were mixed, ground, heated at 1000 °C and reground. The obtained products were checked by XRD, vibrational and electronic spectroscopy, SEM and density measurements.…
Abstract The tetracoordinate bis ‐o ‐iminobenzosemiquinonato cobalt and iron complexes, Co(ISQ‐Pr i ) 2 ( 1 ), Co(ISQ‐Me) 2 ( 2 ), Fe(ISQ‐Pr i ) 2 ( 3 ), Fe(ISQ‐Me) 2 ( 4 ), (ISQ‐Pr i is 4,6‐di‐ tert ‐butyl‐ N ‐(2,6‐di‐ iso ‐propylphenyl)‐ o ‐iminobenzosemiquinone and ISQ‐Me is 4,6‐di‐ tert ‐butyl‐ N ‐(2,6‐dimethylphe…
Thermal strain sensitivity of the dielectric property was investigated for (111)-textured polycrystalline Bi–Zn–Nb–O films. Cubic pyrochlore films with similar crystallinity and the degree of the orientation were obtained on various substrates, and their 111 lattice spacing monotonously increased with the increasing t…