Materials Literature
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Possible types of spatially modulated periodic antiferromagnetic structures in a uniaxial rhombohedral multiferroic with BiFeO 3 crystal symmetry have been studied depending on the ratio of the uniaxial anisotropy and magnetoelectric interaction parameters. It has been shown that, along with symmetric cycloid antiferr…
Most widely occurring classes of carbon nanoparticles used to create polymeric composite systems are considered. The possibility is demonstrated of using “polymer-carbon nanoparticles” composites for raising the level of mechanical properties of polymeric materials, creating friction units with improved tribological c…
We propose and demonstrate experimentally a novel type of nonlinearity in metamaterials, which is induced by mechanical deformation of the structure. The nonlinearity arises from the introduction of an extra degree of freedom in the metamaterial, which allows for elastic displacement of the strongly interacting struct…
A review of the evolution of modeling for accurate dimensional scanning electron microscopy is presented with an emphasis on developments in the Monte Carlo technique for modeling the generation of the electrons used for imaging and measurement. The progress of modeling for accurate metrology is discussed through a sc…
The high-temperature glass-matrix and ceramic-matrix composites developed by the RIAM are overviewed. The distinctive properties of the developed composites are their high stability at temperatures above 1200°C in an oxidizing medium, high endurance and corrosion resistance, and low density and thermal expansion. Ther…
We investigate the transport characteristics of monolayer graphene p-n junctions by means of the nonequilibrium Green’s function technique. It is shown that due to the high interband tunneling of chiral fermions and a finite bandgap opening when the inversion symmetry of the graphene plane is broken, a strong negative…
Design and modeling of a bi-laminate, Galfenol-driven composite beam is presented in which the elasticity of the adhesive layer is considered. The optimal thickness ratio necessary to maximize the tip deflection is found by minimization of the internal energy of the beam. Model simulations show that use of a substrate…
In this work, injection moulding and pressureless sintering in hydrogen were applied to manufacture translucent alumina ceramics. Excellent rheological properties of the feedstocks for injection moulding were obtained through a method of powder pretreatment with stearic acid induced by ball milling. Optimum solid load…
Modeling of refining processes using metal-acid bifunctional catalysts involves an exponentially increasing number of species and reactions, which may rapidly exceed several thousands for complex industrial feedstocks. When building a model for such a process, a priori lumped kinetic models by chemical family do no lo…
Several features of the entropy change S related to the martensitic transformation (MT) in metamagnetic alloys are discussed. In these alloys a change in magnetic order is concomitant with the MT, as it occurs between ferromagnetic austenite and non-magnetic (weakly magnetic) martensite. In this case it has been show…
We report here an investigation that focuses on the organ distribution of metal complexes that are chelated by the amphipolar corrole whose macrocycle is decorated by two sulphonic acid head groups, which are emerging potential therapeutics against cancer (the cytotoxic Ga chelate) and diseases that are characterized…
Understanding and controlling the hierarchical self-assembly of carbon nanotubes (CNTs) is vital for designing materials such as transparent conductors, chemical sensors, high-performance composites, and microelectronic interconnects. In particular, many applications require high-density CNT assemblies that cannot cur…
Three face-to-face biscobalt bisporphyrin dyads, including one incorporating a copper(II) ion inside the linker, were synthesized and characterized both spectroscopically and electrochemically in three non-aqueous solvents, dichloromethane, benzonitrile and pyridine. The electrocatalytic reduction of dioxygen with the…
The effect of initial orientation of samples on the magnetic properties and texture of ultrathin grain-oriented steel strips produced of them has been studied. In a number of cases, the samples with a larger initial deviation from the ideal (110)[001] orientation demonstrate a higher level of magnetic properties (if c…
Abstract In this paper, the structural and spectroscopic properties of rhodamine 3B (R3B) cations incorporated into titanate nanosheet (TNS)/decyltrimethylammonium (C10TMA) cation hybrid was investigated in the presence and absence of adsorbed water. Powder X-ray diffraction measurement under various relative humidity…
This short theoretical review deals with some essential ingredients for the understanding of the quantum Hall effect in graphene in comparison with the effect in conventional two-dimensional electron systems with a parabolic band dispersion. The main difference between the two systems stems from the “ultra-relativisti…
During the last decade, nanotechnology has been applied to medicine with the aim of providing improvements in diagnosis and therapy, resulting in a new discipline often referred to as nanomedicine....
The effect of 2-mercaptobenzimidazole (inh. I) and 2-mercapto-5-methylbenzimidazole (inh. II) on the corrosion of mild steel in 1M solutions of sulphuric acid has been investigated in relation to the concentration of the inhibitor as well as temperature by various monitoring corrosion techniques. The results obtained…
Effect of diffusion annealing on the formation of dysprosium-saturated grain boundaries in sintered Nd-Fe-B magnets has been studied. As a source of diffusion, we used powders of metallic dysprosium, DyCu, DyGa, and Dy3Co alloys and DyH x hydride. Plates ∼1 mm thick made of sintered magnets were molded into powders wi…
We fabricated, in a polymer matrix, liquid crystal (LC) nanosized droplets with a correlation length ξ of about 140 nm, which appear as an optically isotropic film. Differential scanning calorimetry (DSC) and light scattering measurements gave unambiguous evidences of an existence of nematic LC (NLC) order and fluctua…