Materials Literature
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The antiferromagnetic Heisenberg model is studied on a two-dimensional bipartite quasiperiodic lattice. Using the stochastic series expansion quantum Monte Carlo method, the distribution of local staggered magnetic moments is determined on finite square approximants with up to 1393 sites, and a nontrivial inhomogeneou…
We describe a mechanism of spin transfer between individual quantum dots that does not require tunneling. Incident circularly-polarized photons create inter-band excitons with non-zero electron spin in the first quantum dot. When the quantum-dot pair is properly designed, this excitation can be transferred to the neig…
Discrete sine-Gordon (SG) chains are studied with path-integral molecular dynamics. Chains commensurate with the substrate show the transition from collective quantum creep to pinning at bead masses slightly larger than those predicted from the continuous SG model. Within the creep regime, a field-driven transition fr…
Nanoporous polyhedral oligomeric silsesquioxanes (POSS) containing amine groups (NH 2 −POSS) were reacted with poly(amic acid) having anhydride end groups to form porous POSS/polyimide nanocomposites. The van der Waals interaction between tethered POSS molecules is incompatible with the polar−polar interaction of imid…
Calculations on atomistic scale are necessary for understanding of physical phenomena occurring during advanced processing of liquids, slurries, and nano-ceramics composite materials. This paper describes some new ideas for using the Voronoi construction for calculations of amorphous materials or liquids in comparison…
The orbital-charge-spin ordering phase diagram for half-doped perovskites ${\mathrm{L}\mathrm{n}}_{1/2}{\mathrm{B}\mathrm{a}}_{1/2}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$ (Ln $=$ rare earth) with ordered $\mathrm{L}\mathrm{n}/\mathrm{B}\mathrm{a}$ cations has been investigated comparatively with that of the $\mathrm{L}\…
Abstract The high interface area in nanocrystalline materials leads to advanced structural and functional properties that are interesting for a variety of applications and products. Three distinct examples for potential applications are given: Nanocrystalline and submicron-sized light-weight intermetallics based on γ-…
A model to predict the temperature rise in the reacted zone of discharging electrochemical devices has been developed. The model assumes that electrode kinetics are fast and concentration gradients are negligible. In the reacted zone, a thermal boundary layer grows, and its thickness is proportional to the reacted zon…
New complex oxides with phase transitions of a ferroelectric nature are found and synthesized by atomic replacement in the composition of known A m − 1Bi2B m O3m + 3-type phases with due regard for the systematization of their compositions and the conditions of existence of layered perovskite-like structures.
Experiments on the wall-thickness dependence of the cooling-induced deformation (CID) of polystyrene (PS) spherical shells were carried out. For the experiments, the PS shells were fabricated by the density-matched emulsion method using the hand-shaken microencapsulation technique. The number-averaged and weight-avera…
In order to provide a consistent explanation of the operation, the factors contributing to the current through an MPS diode were analysed in forward biasing on an n-type, mesoporous structure. The diodes having a degenerate n-doped ITO metallisation were characterised by recording the temperature dependent I–V charact…
In the present work thermal and chemical properties of a glass‐ceramic frit containing zirconium oxide are evaluated after milling in various polar and nonpolar solvents. Particle‐size distribution is one of the main variables investigated to evaluate the efficiency of several solvents. Milling in various solvents doe…
Thermal degradation of subliming and intumescent fire retardant coatings is studied and kinetic information is derived for the various physical and chemical processes occurring within the coatings. An approach that requires estimation of the invariant values of kinetic parameters is used in the study. The probability…
Synthetic methods were developed to prepare ethyl (E)-4-[2-(3,4-dihydro-2-n-octyl-1-oxy-2H-1-benzothio-pyran-6-yl)-1-propenyl]benzoate ( 1 ) and ethyl (E)-4-[2-(3,4-dihydro-2-n-octyl-2H-1-benzothiopyran-6-yl)-1-propenyl]benzoate ( 10 ). These are the first examples of heteroarotinoids which possess properties of liqui…
This paper presents a dynamic damage model for predicting fracture and fragmentation of brittle materials subjected to loads with high loading rates. This model is based on the mechanics of microcrack nucleation, growth, and coalescence to formulate the evolution of damage. The damage in the model is assumed to be iso…
The thermomechanical response of 50.7 at.-%Ni-Ti superelastic alloy has been investigated for a range of applied strains and strain rates. Parameters of interest include the critical stresses for nucleation and completion (σ ms and σ mf respectively) of the stress induced martensite (SIM) transformation, as well as th…
A composite material is produced by using polyester textile wastes as reinforcement material and mainly urea formaldehyde as matrix material. This composite is used in banks, tables, shelves, and pots. The bending strength and absorption properties of the textile reinforced composite are investigated and compared with…
It has been shown that the photoluminescence (PL) intensity of a porous silicon (PS) sample, covered by a thin SiC film is six times larger compared with the initial PS subjected to rapid thermal annealing (RTA), and a strong up-shift (∼100 nm) is observed relative to the non-treated PS + SiC sample. Clustering proces…
The depth of radiological contamination is information required for decontamination and decommissioning of nuclear facilities. This paper proposes and tests a simple technique for measuring the depth of contamination. The method uses measurements with an HPGe detector at two distances (or heights) from the surface on…
The effective thermal conductivity κ eff of seven opal + epoxy resin nanocomposite samples with 100% filling of first-order pores by epoxy resin was measured in the 100-to 300-K temperature interval. In the nanocomposite studied, the thermal conductivity of the matrix (amorphous SiO 2 spheres) is larger than that of t…