Materials Literature
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We examine here the Bobylev–Pikin flexoelectric instability in an initially planar monodomain of a bent-core nematic liquid crystal, which is negative in conductivity and dielectric anisotropies. Experiments employing dc excitation reveal the domain density to be linear in field, as predicted; however, the instability…
Arrays of vertically aligned, [010] oriented α-MoO3 nanorods were grown on planar silicon substrates by pulsed electron beam deposition. The morphology and structure of the nanorods as well as their growth mechanism were investigated. These [010] oriented nanorods exhibited a good field emission performance with a tur…
The sulfur SAD phasing method allows the determination of protein structures de novo without reference to derivatives such as Se-methionine. The feasibility for routine automated sulfur SAD phasing using a number of current protein crystallography beamlines at several synchrotrons was examined using crystals of trimer…
SUMMARY Layered double hydroxides (LDHs) and Sn‐containing LDHs have been synthesized using a co‐precipitation method, and the resulting products have been characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FTIR) and Brunauer‐Emmett‐Teller(BET) su…
This paper reports the preparation of five bis-porphyrin copolymers using zinc β-octaethylporphyrin (ZnOEP) type macrocycles and porphyrins functionalized by several pyridyl groups.
Self-assembled epitaxial nanocomposite CoFe 2 O 4:SrTiO 3 and CoFe 2 O 4:MgO thin films were grown on LaAlO 3 substrates by a chemical solution approach of polymer-assisted deposition. X-ray diffraction and transmission electron microscopy analyses indicated that both phases in the composites were epitaxial with respe…
Functionalized phenols based on tyramine were synthesized in order to be selectively grafted on to hexachlorocyclotriphosphazene, affording a variety of functionalized dendrons of type AB(5). The B functions comprised fluorescent groups (dansyl) or dyes (dabsyl), whereas the A function was provided by either an aldehy…
During recent years, biological synthesis of nanoparticles by microorganisms has been receiving increasing attention. In this investigation, an antimony-transforming bacterium was isolated from the Caspian Sea in northern Iran and was used for intracellular biosynthesis of antimony sulfide nanoparticles. This isolate…
Chitosan is prepared by the deacetylation of chitin, the second-most abundant biopolymer in nature, and has applicability in the removal of dyes, heavy metals and radioactive waste for pollution control. In weight-reduction remedies, chitosan is used to form hydrogels with lipids and to depress the intestinal absorpti…
A model for estimating the viscosity of silicate melt as derived in our previous paper is extended to the system containing MgO, CaO, SrO, BaO, Li2O, Na2O, K2O, which can express the nonlinear variation of activation energy of viscosity with the composition. It is found that the optimized parameters of model which cha…
Some building materials, regularly used in Turkey, such as sand, cement, gas concrete (lightweight, aerated concrete), tile and brick, have been investigated in terms of mass attenuation coefficient (μ/ρ), effective atomic, numbers (Z(eff)), effective electron densities (N(e)) and photon interaction cross section (σ(a…
Dysprosium-doped nickel-ferrite (NiFe1.925Dy0.075O4) thin films were fabricated using sputter-deposition using a stoichiometric bulk target prepared by the solid state chemical reaction. The structural, electrical and optical properties of NiFe1.925Dy0.075O4 thin films were studied in detail. The grain-size (L) and la…
High resolution x-ray absorption spectroscopy (XAS) affords new insight into the microscopic properties of perovskite transition metal oxides. Interpretation of XAS spectra in transition metal oxides requires theoretical tools capable of describing relativistic and many-body effects. In this work, full relativistic (S…
In nanomaterials synthesis, Ostwald ripening is a postsynthetic problem that is one obstacle for common utilization of nanomaterials. Herein, we report an unprecedented Ostwald ripening mechanism resulting from the simple combination of hydrogen peroxide (H 2 O 2 ) and cetyltrimethylammonium bromide (CTAB)-stabilized…
Cellulose esters, where thermoplastic cellulose acetate is the most industrially relevant derivative, have become highly significant as biodegradable materials issued from renewable bio-feedstock. This contribution highlights some of the main achievements in blending and functionalization of cellulose acetate through…
We introduce a model system of anisotropic colloidal ‘rocks’. Due to their shape, the bonding introduced via non-absorbing polymers is profoundly different from spherical particles: bonds between rocks are rigid against rotation, leading to strong frustration. We develop a geometric model which captures the essence of…
The 2:1 family of organic salts ($o$-DMTTF)${}_{2}X$ ($X$ = Cl, Br, I) exhibits regular stacks and a high-symmetry structure, which provide a perfect three-quarter-filling-band system allowing a rich phase diagram in the presence of strong electronic correlations. In this paper, we present a detailed study of this ser…
We report the domain structure and ferroelectric properties of a 32 nm-thick Bi0.9Sm0.1FeO3 film epitaxially grown on a LaAlO3 (LAO) substrate. This film exhibits a monoclinic Mc phase, with its monoclinic distortion and anisotropy of in-plane (IP) lattice parameters being both smaller than those of pure BiFeO3 (BFO)…
The interplay between aliovalent CuO doping and nonstoichiometry on the development of defect structures and the formation of secondary phases of antiferroelectric NaNbO${}_{3}$ ceramics has been investigated by means of x-ray diffraction (XRD), first-principles calculations using density functional theory (DFT), and…
We studied the electronic structure and magnetization of Mn dopants in GaN nanowires at the ensemble and single nanowire levels by near edge x-ray absorption fine structure spectroscopies. The results of single nanowire measurements indicate that Mn adopts tetrahedral coordination in GaN nanowires and has mixed oxidat…