Materials Literature
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We investigate the effect of magnetic impurities on the local quasiparticle density of states in iron-based superconductors. Employing the two-orbital model where $3d$ electron and hole conduction bands are hybridizing with the localized $f$ orbital of the impurity spin, we investigate how various symmetries of the su…
The influence of the synthesis conditions of SBA-15 silica support in the development of Ti-SBA-15 epoxidation catalysts has been studied in detail. In this study, efficient and stable Ti-SBA-15 epoxidation catalysts were prepared using a recently developed postgrafting method based on the insertion of a chelated tita…
This work presents investigations on the Ni self-diffusion coefficient in Al-Ni melts forming the technological relevant intermetallic phases ${\text{Al}}_{50}{\text{Ni}}_{50}$ and ${\text{Al}}_{25}{\text{Ni}}_{75}$ by quasielastic neutron scattering. We found that the Ni self-diffusivity at constant temperature is ne…
Density functional theory calculations have been performed to elucidate the mechanism of N 2 O formation over the Au(111) surface during NO reduction. It is shown that the dissociation of NO into an N atom and an O atom involves a barrier as high as 3.9 eV, implying that the formation of N 2 O does not occur via the d…
One more twist of a Möbius strip: Metalation of Möbius-aromatic hexakis(pentafluorophenyl)[28]hexaphyrin (see picture; Pd red, Cl green, N blue, phenyl rings omitted) provides a highly stable organic radical that is delocalized over a doubly twisted π-conjugation system. The two-photon absorption cross-section is dist…
The minimal model to describe many spin-chain materials with ferroelectric properties is the Heisenberg model with ferromagnetic nearest-neighbor coupling ${J}_{1}$ and antiferromagnetic next-nearest-neighbor coupling ${J}_{2}$. Here we study the thermodynamics of this model using a density-matrix algorithm applied to…
The electronic structures of FeAs compounds are sensitive to FeAs bonding, which is described unsuccessfully by the local density approximation (LDA). Treating the multiorbital fluctuations from ab inito LDA+Gutzwiller method, we can now predict the correct FeAs bond length and bonding strength, which will explain the…
We synthesized various azobenzenes methylated at their ortho positions with respect to the azo bond for more effective photoregulation of DNA hybridization. Photoregulatory efficiency, evaluated from the change of T(m) (DeltaT(m)) induced by trans-cis isomerization, was significantly improved for all ortho-modified az…
We have produced graphene sheets decorated with a nonpercolating network of nanoscale tin clusters. These metal clusters both efficiently dope the graphene substrate and induce long-range superconducting correlations. We find that despite structural inhomogeneity on mesoscopic length scales (10-100 nm), this material…
We describe here the use of high-temperature oxidation and reduction to produce highly crystalline nanoparticles of Ni and NiO. Starting with an amorphous Ni powder, we demonstrate that oxidation at $900\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$ produces faceted NiO nanocrystals with sizes ranging from 20 to…
Photoresponsive block copolymers (PRBCs) containing azobenzenes and other chromophores can be easily prepared by controlled polymerization. Their photoresponsive behaviors are generally based on photoisomerization, photocrosslinking, photoalignment and photoinduced cooperative motions. When the photoactive block forms…
Abstract Surface‐enhanced Raman scattering (SERS) spectra of fonofos, an organophosphorous pesticide (OPP), were recorded using citrate‐reduced silver (Ag) and gold (Au) colloidal nanoparticles in the form of dried films. In this study, significant enhancements were achieved with fonofos concentrations down to ∼10 ppm…
Highly water-soluble ultrathin and fluorescent CdS nanorods are directly synthesized with the assistance of PEI. PEI plays as the passivator to control and induce the growth of the CdS nanorods and also makes the as-obtained nanorods dispersible in water. The as-obtained CdS nanorods are quite thin thus showing the qu…
The solubility data of 5-amino salicylic acid in methanol, ethanol, carbon tetrachloride, and tetrahydrofuran (THF) at various temperatures were measured by gravimetrical method from (293.15 to 313.15) K under atmospheric pressure, and the solubility data were correlated as a function of temperature. The order of solu…
In this work, we report the synthesis and characterization of highly ordered mesoporous CeO(2) thin films with crystalline walls. While this article focuses on electrochemical studies of CeO(2) with periodic nanoscale porosity, we also examine the mechanical properties of these films and show how pore flexing can be u…
We perform nonequilibrium simulations of heat conduction in a three dimensional anharmonic lattice. By studying slabs of length N and width W, we examine the crossover from one dimensional to three dimensional behavior of the thermal conductivity kappa. We find that for large N, the crossover takes place at a small va…
Assemblies formed by solid particles at interfaces have been widely studied because they serve as models of molecular phenomena, including molecular self-assembly. Solid particles adsorbed at interfaces also provide a means of stabilizing liquid-liquid emulsions and synthesizing materials with tunable mechanical, opti…
A new series of boron-dipyrromethene (BDP, BODIPY) dyes with dihydronaphthalene units fused to the beta-pyrrole positions (1a-d, 2) has been synthesised and spectroscopically investigated. All the dyes, except pH-responsive 1d in polar solvents, display intense emission between 550-700 nm. Compounds 1a and 1b with a h…
Here we report a facile method to fabricate highly b-oriented and submicrometer thin MFI films on substrates. Neither an anhydrous environment nor a specifically designed structure-directing agent (SDA) is required in the whole process, and by innovation of the secondary growth process, twin growth of the b-oriented s…
We have studied damping in polycrystalline Al nanomechanical resonators by measuring the temperature dependence of their resonance frequency and quality factor over a temperature range of 0.1 - 4 K. Two regimes are clearly distinguished with a crossover temperature of 1 K. Below 1 K we observe a logarithmic temperatur…