Materials Literature
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Abstract Single molecule studies are limited to a defined class of organic dye molecules inserted into respective host materials. Basic requirements for suited material combinations include high photon emission rates and long term photostability. A majority of known aromatic host–guest systems employ crystalline organ…
The preparation of ultraporous polymer resins using a straightforward hard-templating synthesis is presented. Self-assembly of silica nanospheres into densely packed glasses allows an easy preparation of templates. Polydivinylbenzene resins with surface areas of up to 1000 m(2) g(-1) are synthesized as a model system…
Composites of Nb-doped strontium titanate mixed with yttria-stabilized zirconia or cerium oxide in 50:50, 70:30 and 85:15 weight ratios were evaluated as possible anode/electrolyte interface materials for solid oxide fuel cells in terms of chemical compatibility, electrical conductivity and mechanical properties. It h…
We report the results of electrical and magnetic properties on a series of K${}_{x}$Fe${}_{2\ensuremath{-}y}$S${}_{2}$ ($x$ $=$ 1, 0.8, $y$ $=$ 0.1--0.5) single crystals. KFe${}_{1.5}$S${}_{2}$ exhibits a semiconductor electrical property and undergoes an antiferromagnetic transition at about 43 K. Superconductivity w…
In a reference frame rigidly bound to the complex, we consider two Hamiltonians possibly at the origin of the very fast electronic relaxation of the paramagnetic lanthanide Ln(3+) ions (Ln = Ce to Nd, Tb to Yb), namely the mean (static) ligand-field Hamiltonian and the transient ligand-field Hamiltonian. In the labora…
The electrochemical oxidation of SrFe 0.5 Co 0.5 O 3- y in alkaline solution was used to enhance its oxygen content. As a result of chemical titrations and Mössbauer spectroscopy studies, it is shown that the distribution of cobalt and iron oxidation states are heterogeneous, indicating that oxidation of cobalt cation…
Abstract The present work investigates the relation between ferromagnetism and intrinsic defects of C‐doped ZnO thin films. The room‐temperature ferromagnetism (RTFM) in C‐doped ZnO is due to the charge transfer between Zn 4s and C 2p orbitals. The long‐range magnetic interaction in C‐doped ZnO is due to carbon–carbon…
In this study, two finite-difference time-domain algorithms are proposed for time domain analysis of the lossy non-uniform composite right/left-handed transmission line (CRLH TL). The results of the proposed algorithm are confirmed with those of the ADS commercial software. The numerical stability of the proposed algo…
In recent years, silicon nanostructures have been investigated extensively for their potential use in photonic and photovoltaic applications. So far, for silicon quantum dots embedded in SiO(2), control over inter-dot distance and size has only been observed in multiple bilayer stacks of silicon-rich oxides and silico…
The Ni₇ nanomagnet represents an ideal model system for investigating the effects of geometrical frustration in magnetic interactions. The Ni ions in the magnetic core are arranged on two corner-sharing tetrahedra and interact through antiferromagnetic exchange couplings. We show that the high degree of frustration le…
Synthesizing single phase nanocrystalline rare earth iron garnet is difficult owing due to its complex crystal structure. In this report, single phase Dy3Fe5O12 nanoparticles with different grain sizes (50, 32, and 22 nm) were prepared using the ball milling technique in a controlled atmosphere. The average grain size…
Glass transition temperatures T(g) are investigated in aqueous binary and multi-component solutions consisting of citric acid, calcium nitrate (Ca(NO(3))(2)), malonic acid, raffinose, and ammonium bisulfate (NH(4)HSO(4)) using a differential scanning calorimeter. Based on measured glass transition temperatures of bina…
An efficient implementation of simultaneous reverse Monte Carlo (RMC) modeling of pair distribution function (PDF) and EXAFS spectra is reported. This implementation is an extension of the technique established by Krayzman et al. [J. Appl. Cryst. 42, 867 (2009)] in the sense that it enables simultaneous real-space fit…
α-Isopropylmalate synthase (α-IPMS) catalyzes the metal-dependent aldol reaction between α-ketoisovalerate (α-KIV) and acetyl-coenzyme A (AcCoA) to give α-isopropylmalate (α-IPM). This reaction is the first committed step in the biosynthesis of leucine in bacteria. α-IPMS is homodimeric, with monomers consisting of (β…
This article deals with the development and use of different gradient beam theories in order to predict the vibrational behavior of single-walled carbon nanotubes (SWCNTs). To address the problem of free vibration, the Euler–Bernoulli and Timoshenko beam theories in conjunction with the gradient elasticity theories in…
We investigate two mechanisms of crystallographic slip in graphene, corresponding to glide and shuffle generalized stacking faults (GSF), and compute their γ-curves using Sandia National Laboratories Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). We find evidence of metastable partial dislocations…
With their sub-nanometer inter-sheet spacing, few-layer graphenes (FLGs) are alignment-free building blocks for nanosensors based on the inter-sheet effects. In this paper, we have tackled the challenges towards batch fabrication of inter-sheet graphene sensors through controlled layer engineering, edge tailoring and…
Coherent GHz acoustic phonon dynamics in a tubular nanoporous alumina film is studied with picosecond acoustic methods. This study has allowed the determination of the out-of-plane sound velocity and the effective optical index through a time-resolved Brillouin analysis. Several acoustic eigenmodes of the tubular nano…
A series of heavy metal oxide (HMO) glasses with composition 26.66B 2 O 3 -16GeO 2 -4 Bi 2 O 3 -(53.33- x )PbO- x PbF 2 (0 ≤ x ≤ 40) were prepared and characterized with respect to their bulk (glass transition and crystallization temperatures, densities, molar volumes) and spectroscopic properties. Homogeneous glasses…
This article reports single‐step molten salt synthesis to prepare single‐crystal, platelike NaNbO 3 particles without the Bi 2 O 3 byproduct. In the previous method of two‐step molten salt synthesis, platelike Bi 2.5 Na 3.5 Nb 5 O 18 particles have been prepared by heating a mixture of Bi 2 O 3 , Na 2 CO 3 , and Nb 2…