Materials Literature
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The Coulomb interaction between massless Dirac fermions may induce dynamical chiral symmetry breaking by forming excitonic pairs in clean graphene, leading to semimetal-insulator transition. If the Dirac fermions have zero bare mass, an exact continuous chiral symmetry is dynamically broken and thus there are massless…
FexPt(1−x) nanowire arrays embedded in porous alumina membranes with controlled diameters and high aspect ratios were fabricated by the pulse electrodeposition method in a novel bath with a simple composition. The composition of FexPt(1−x) nanowires can be highly controlled by the negative deposition voltage and the p…
Calculations for model oligomers of the emeraldine salt with UBLYP/6-31G*/PCM are performed. The models differ in number of monomers, in the position of the counterions (Cl(-)), and in multiplicity. The molecular features affected most prominently by the protonation, namely, structure, energetics, and electron and spi…
Studies aimed at understanding the global properties of the hyperpolarizabilities have focused on identifying universal properties when the hyperpolarizabilities are at the fundamental limit. These studies have taken two complimentary approaches: (1) Monte Carlo techniques that statistically probe the full parameter s…
We have developed a general method combining photochemical grafting and copper-catalyzed click chemistry for biofunctionalization of titanium substrates. The UV-activated grafting of an α,ω-alkenyne onto TiO(2)/Ti substrates provided a "clickable" thin film platform. The selective attachment of the vinyl end of the mo…
Abstract An evaluation of the suitability of commercially available biopolymers on the shelf‐life of fresh salmon fillet was done. The comparison included two different types of biomaterials, poly lactic acid (PLA)‐based and starch‐based materials, and two traditional materials, amorphous polyethylene terephthalate/po…
It has recently been demonstrated that pentacene can serve as protection layer for graphene on SiC preserving the unique E(k) band dispersion after exposure to atmosphere and subsequent annealing in vacuum. We confirm the stability of the ideal graphene band dispersion but without any protection layer. We demonstrate…
Optical absorption spectroscopy and X-ray structural refinements of seven different spinel single crystals on the (Mg 1-x Mn x )Al 2 O 4 solid solution (x = 0.02-1.00) evidences exceptionally strong relaxation (ε = 0.83) of IV Mn 2+ -O bonds. Our single-crystal structure refinements demonstrate that the ideal IV Mn 2+…
Adhesion and delamination behavior of amorphous carbon nitride (a-CN(x)) is critical to development of wear resistant materials and protective coatings. Here, the composition and delamination behavior of a-CN(x) films was explored utilizing BrCN, CH₃CN, and CH₄ as film precursors, either alone or in combination with o…
La1− x Sr x MnO3 perovskite manganite materials with different compositions (x = 0.28, 0.31 and 0.36) have been prepared employing solid-state reaction technique. On-line evaluation of ultrasonic velocities and longitudinal attenuation of the above samples has been done over a wide range of temperatures using the tran…
We have investigated the thermally induced depolarization degree in long-rod cubic crystals of classes 23 and m3 as a function of the heated region and the probe beam radii as well as on crystal orientation. We extended the photoelastic anisotropy parameter and introduced a second anisotropy parameter. Three new speci…
Remarkably rigid diphenylalanine peptide nanotubes are used as an organic nanofiller in an epoxy matrix, significantly increasing adhesive strength and toughness in addition to preserving the epoxy thermal and elongation properties. This effect exceeds the reinforcing effect of several known inorganic nanofillers, pos…
The synthesis, purification, structural analysis, and photophysical properties of a series of five-, six-, and seven-sided Fe(II) macrocycles and the corresponding hexameric Cd(II) macrocycle, all prepared by self-assembly of a 120° bis(terpyridine) ligand modified with first- and second-generation 1→3 C-branched dend…
Three-dimensional (3D) cubic perovskite (La,Sr)MnO3 (LSMO) nanofilms have been deposited on ZnO nanorod arrays with controlled dimensionality and crystallinity by radio frequency (rf) magnetron sputtering and post thermal annealing. Compared to the two-dimensional (2D) LSMO nanofilm on flat Si, the structure and magne…
Lead zirconate titanate ceramics Pb(Zr1–x Ti x )O3 with spatially graded composition from X = 46 to 49 were studied by Raman scanning microscopy and the results were compared with Raman spectra in PZT ceramics of different compositions around the morphotropic phase boundary (MPB). An E-symmetry mode located near 200 c…
This study investigates the biological response of Pseudokirchneriella subcapitata to single-walled carbon nanotubes (SWNTs) suspended in gum Arabic (GA), using typical 96-hour algal bioassays and long-term growth studies. Changes in algal biomass and cell morphology associated with specific SWNT-treatments were monit…
We report an investigation of the local structure in homovalent-substituted BaTi1−x Zr x O3 relaxors by a combination of experimental and theoretical methods, namely neutron total scattering, X-ray absorption spectroscopy, and supercell ab-initio calculations. It is shown that unlike Zr atoms, Ti atoms are largely dis…
Mn/Cu heterostructures thermally evaporated onto SiO2 and, subsequently, annealed were investigated by transmission electron microscopy related techniques in order to study the diffusion interactions which lead to barrier layer formation. Energy dispersive x-ray spectroscopy and electron energy loss spectroscopy provi…
This Communication describes the synthesis and crystallographic investigation of copper(I) and silver(I) complexes of a modified adenine analogue, bearing a thiocyanate pendant arm at the N9 position. A novel adenine-containing hexagonal prismatic cuprous iodide aggregate was obtained with Cu(+), while Ag(+) interacti…
Heterogeneous integration of dissimilar single crystals is of intense research interests. Lattice mismatch has been the most challenging bottleneck which limits the growth of sufficient active volume for functional devices. Here, we report self-assembled, catalyst-free, single crystalline GaAs nanoneedles grown on sap…