Materials Literature
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Laterally structured antireflective sub-wavelength structures show unique properties with respect to broadband performance, damage threshold and thermal stability. Thus they are superior to classical layer based antireflective coatings for a number of applications. Dependent on the selected fabrication technology the…
P-E hysteresis loop was measured for stoichiometric and non-stoichiometric NaNbO3. The untypical applied-field dependence of the hysteresis can be interpreted by the strong pinning effect on the domain reversal. The non-stoichiometry of the sample was found to enhance the pinning effect. It is finally concluded that N…
Abstract In this paper, the formation and corrosion resistance of the phytic acid conversion coatings on Mg, Al, and AZ91D magnesium alloy were contrastively investigated using scanning electronic microscopy (SEM), Auger electron spectroscopy (AES), Fourier transform infrared spectroscopy (FTIR), electronic probe micr…
Ceramic/polymer composites made of nanosized CaCu3Ti4O12 (CCTO) powders as filler and P(VDF-TrFE) copolymers as matrix were fabricated by solution casting method followed by a hot-press process. The hot-press process results in a better morphological uniformity in the composites. The morphology of the composites was i…
We use non-equilibrium molecular dynamics (NEMD) to compute the thermal conductivity (κ) of orthogonally ordered cross-bar structures of single-walled carbon nanotubes. Such structures exhibit extremely low thermal conductivity in the range of 0.02-0.07 W m(-1) K(-1). These values are five orders of magnitude smaller…
BaTiO3 ceramics with Sm additions in the range of 1 mol% to 8 mol% were prepared through a solid-state reaction sintering in nitrogen atmosphere. The ceramic structure and morphology, temperature dependences of the dielectric constant and I-V properties were characterized. The results indicated that Sm3+ ions incorpor…
Protein structure is generally more conserved than sequence, but for regions that can adopt different structures in different environments, does this hold true? Understanding how structurally disordered regions evolve altered secondary structure element propensities as well as conformational flexibility among paralogs…
Barium titanate (BaTiO3) ceramics with various grain sizes from 0.7 to 13 μm were prepared by a conventional sintering method and a two-step sintering method. The permittivity of the BaTiO3 ceramics with an average grain size of 1.1 μm exhibited a maximum around 8,000. By ultrawide range dielectric spectroscopy, the d…
The potential of novel functional star-shaped poly(ε-caprolactone)s of controlled molecular weight and low molecular weight distribution bearing acrylate end groups as material for biomedical applications was demonstrated in this study. The polymers were functionalized via Michael-type addition of amino acid esters co…
We herein report a β-cyclodextrin-based secondary assembly (β-CD SA) obtained from an aqueous solution. It was found that the addition of a very small amount of organic molecule 2-phenyl-5-(4-diphenylyl) 1,3,4-oxadiazole (PBD) into an aqueous solution of 10 mM β-CD led to the formation of a micrometer-sized rodlike SA…
Abstract In the present work the effect of atmosphere composition on the growth rate and adherence of the alumina scales was studied using free‐standing MCrAlY‐coatings and TBC‐specimens with MCrAlY‐bondcoats. The exposures comprised isothermal and cyclic exposures in laboratory air and Ar‐H 2 ‐H 2 O at 1100 °C. It is…
Results of the Differential Scanning Calorimetry (DSC) studies of porous glasses filled by KNO3 ferroelectric in wide temperature range are presented. Anomalous heat capacity of the potassium nitrate confined in nanoscale porous glasses with two different radius of pore 23 and 160nm show that the phase I-III transitio…
BACKGROUND: In recent years, near-infrared fluorescence (NIRF)-labeled iron nanoparticles have been synthesized and applied in a number of applications, including the labeling of human cells for monitoring the engraftment process, imaging tumors, sensoring the in vivo molecular environment surrounding nanoparticles an…
We report the magnification of subwavelength field distributions using a tapered array of metallic wires with planar front and back interfaces through numerical simulations and experiments. It is demonstrated that subwavelength images with a resolution of one-fifteenth of a wavelength can be transferred to a distance…
We study the adhesion of liquid droplets to rough surfaces, focusing on how adhesion changes with surface chemistry and roughness. For hydrophobic surfaces (equilibrium contact angle ${\ensuremath{\theta}}_{\text{e}}>90\ifmmode^\circ\else\textdegree\fi{}$), although increasing surface roughness augments apparent co…
Two new oxyselenide materials have been synthesized with composition La 2 O 2 M Se 2 ( M = Mn, Fe). They adopt a new structure type, the β structure, which has been solved and refined from powder X-ray and neutron diffraction data. The structure is described by Ama 2 symmetry with unit cell ∼17.5 Å × 16.6 Å × 4.0 Å an…
In this paper, the behavior of oxidized methylcelluloses is compared with that of the initial methylcellulose, an amphiphilic cellulose derivative. Methylcelluloses are important for many applications in the cosmetic and food industries. The mechanism of thermo-gelation of methylcellulose is briefly explained as well…
The relaxor-based ferroelectric single crystals Pb(In1/2Nb1/2)O3- Pb(Mg1/3Nb2/3)O3-PbTiO3 were grown successfully using the vertical Bridgman technique. The crystals were spontaneously nucleated and induced to grow by the seed respectively, with diameter of Ø25–40 mm and length of 80–170 mm. The [001]-oriented wafers…
We report an interesting observation on strong enhancement in green luminescence from hybrid ZnO/multi-walled carbon nanotubes (MWCNTs). The hybrid structures were synthesized via a high temperature sintering method. The strong green emission at 510 nm has been attributed to surface defects of ZnO, originating from in…
We present a density-functional theoretical investigation of the electronic and magnetic properties of octametallic Cr-based molecular antiferromagnetic rings. The presence of the divalent magnetic ion M unbalances the charge and the spin of the parent Cr(8) ring, leading to a finite total spin in the molecules. Resul…