Materials Literature
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A major challenge in structural biology is to produce high-quality protein crystals for X-ray diffraction. Currently, proteins are crystallized by trial and error, often in multicomponent solutions with chiral precipitants. As proteins are chiral molecules, we hypothesized that the chirality of the precipitants may af…
The distribution of polarization in low-dimensional ferroelectric nanostructures appears to form vertex structures under open-circuit boundary conditions. A thermodynamics-based continuum phase field approach is employed to investigate the conditions for existence of single-vertex structure in two-dimensional (2D) squ…
The reactions of yttrium and lanthanum atoms with O(2) have been reinvestigated using matrix isolation infrared spectroscopy and theoretical calculations. The ground-state yttrium and lanthanum atoms react with O(2) to produce the inserted yttrium and lanthanum dioxide molecules as the initial products. The yttrium di…
Drug-eluting stents (DES) have become an accepted technology in intravascular intervention. Manufacturing methodologies of DES are based mainly on mechanical processes, which tend to generate coatings that have poor stability properties; these were recently related as a potential hazard. A novel approach for significa…
The inhibition effect of potassium iodate on the corrosion of aluminum in 2M HCl has been studied by weight loss, polarization and electrochemical impedance spectroscopy (EIS) measurements. It has been found that KIO 3 acts as an excellent inhibitor. Inhibition efficiency with 100 ppm inhibitor was very high. Polariza…
We investigate the electronic transport characteristics of an electrolyte-gated conducting polyaniline (PANI) nanowire field-effect transistor (FET) assembled between two Au electrodes on SiO2/Si substrate using nanochannel-assisted chemical oxidative polymerization. This is the first demonstration that the current-vo…
This work presents a study of tellurite glasses doped with Eu 3+ and Au nanoparticles. Luminescence of Eu 3+ ions in the yellow–red region was examined as a function of Au nanoparticles concentration, while the thermal lens technique furnished the thermal diffusivity of the samples. The influence of the nanoparticles…
Multilayer superlattices consisting of multiferroic Bi(2)NiMnO(6) (BNMO) and La(2)NiMnO(6) (LNMO) have been grown heteroepitaxially on pure and Nb-doped SrTiO(3) substrates using the pulsed laser deposition technique. In a series of superlattice structures grown with a fixed BNMO layer thickness of ten unit cells, we…
Anomalous dependencies of the dynamic (pulse) and static tunability [k(U)=C(0)/C(U)] as a function of permittivity (ε) were observed in ferroelectric varactors based on doped paraelectric state (Ba,Sr)TiO3 ceramics. The reduction of the relatively high permittivity value from ε≅810 down to ε≅260 by introducing various…
Metal enhanced/quenched luminescence was explored in the vicinity of Ag x Cu 100- x alloy nanoparticles at different compositions ( x = 100, 67, 50, 30, and 0). These Ag−Cu nanoparticles were synthesized using the polyol process. It was observed that the luminescence of dyes was strongly dependent on the Ag−Cu nanopar…
Mg 0.9 Mn 0.1 In x Fe 2− x O 4 ( x = 0.1 and 0.2) and Mg 0.9 Mn 0.1 Al y Fe 2− y O 4 ( y = 0.1, 0.5 and 0.7) ferrites, with improved initial permeability and extremely low relative loss factor (RLF), were synthesized by the citrate precursor technique. Structural studies were made by using the x-ray diffraction techni…
Two kinds of epitaxial structures were grown by standard pulsed laser deposition on (001) Si, namely La(0.7)Sr(0.3)MnO(3)/Bi(4)Ti(3)O(12)/CeO(2) /YSZ/Si (BTO-based), and La(0.7)Sr(0.3)MnO(3)/SrTiO(3)/CeO(2) /YSZ/Si (STO-based) multilayers. The samples were investigated by means of x-ray diffraction, transmission elect…
Ba x Sr 1 − x TiO 3 is ideally suited as a tunable medium for radio frequency passive component. In this context we have studied the effect of biaxial strain on the dielectric and ferroelectric properties of Ba0.5Sr0.5TiO3 thin films grown epitaxially on SrTiO3 (001) substrates. The lattice parameters of the films det…
Thermopower (Sn) of compacted nanocrystalline Ni of average particle size D=38, 32, and 25 nm at low temperatures (5–300 K) is reported here. Sn exhibits striking deviations from bulk thermopower Sbulk behavior revealing evolution of Sn with change in D. As D decreases, there is significant decrease in Sn, gradual dis…
PURPOSE: Previously, we have shown that the amphiphilic oligopeptide SA2 (Ac-Ala-Ala-Val-Val-Leu-Leu-Leu-Trp-Glu-Glu-COOH) spontaneously self-assemble into nano-sized vesicles in aqueous environment. Relative weak individual intermolecular interactions dominate such oligopeptide assemblies. In this study we aimed at i…
We computed thermoelectric properties of nanoporous Ge (np-Ge) with aligned pores along the [001] direction through a combined classical molecular dynamics and first-principles electronic structure approach. A significant reduction in the lattice thermal conductivity of np-Ge leads to a 30-fold increase in the thermoe…
Electronic states of graphenes, whose carbon atoms are terminated by hydrogen atoms (hydrogenated graphene, denoted H-graphene) and defective graphene (one carbon atom was removed from H-graphene, denoted D-graphene) have been investigated by density functional theory. The sizes of graphenes examined in the present st…
Effects of multiwalled carbon nanotubes (MWCNTs) and Ni 2 O 3 on the flame retardancy of linear low density polyethylene (LLDPE) have been studied. A combination of MWCNTs and Ni 2 O 3 showed a synergistic effect in improving the flame retardancy of LLDPE compared with LLDPE composites containing MWCNTs or Ni 2 O 3 al…
The chemical instability of line patterned Ge2Sb2Te5 was studied by transmission electron microscopy after electrically inducing melt and solidification. Compositional analysis showed elemental separation of Te to the anode side, while Ge and Sb mutually separated at the cathode side. Such elemental separation of Ge2S…
We report on structural, magnetic, and transport properties of LaxMnO3−δ (LMO) thin films, epitaxially grown on SrTiO3 substrates by molecular beam epitaxy. Transport properties were investigated as a function of the La/Mn stoichiometry and the oxygen content. Optimal oxygenated LMO films (with stoichiometry ratio La/…