Materials Literature
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Abstract We report experimental measurements of the melting of mixtures confined in nanoporous materials. Dielectric relaxation spectroscopy (DRS) was used to determine the solid–liquid phase diagram of bromobenzene/carbon tetrachloride (C 6 H 5 Br /CCl 4 ) mixtures confined in controlled pore glasses (CPGs) with an a…
The microstructure and rheological properties of a model colloidal system was probed in the vicinity of the glass transition by small-angle and ultra small-angle x-ray scattering, dynamic light scattering (DLS) and bulk rheology. The volume fraction of the particles was deduced by modeling the structure factor and the…
Highly ordered HfO2 nanotube arrays were prepared through an electrochemical anodization in the presence of NH4F and ethylene glycol. The voltage-dependent pore size, wall thickness and porosity were studied using scanning electron microscopy and a wall thickness to pore size ratio was proposed on the basis of the res…
Locally anisotropic porous materials were prepared using linear low-density polyethylene (LLDPE) and crystallizable organic diluents by thermally induced phase separation processes. Pyrene and hexamethylbenzene (HMB) were selected as crystallizable diluents because of their miscibility with LLDPE at elevated temperatu…
The intrinsic large electronegativity of $\text{O}\text{ }2p$ character of the valence-band maximum (VBM) of ZnO renders it extremely difficult to be doped $p$ type. We show from density functional calculation that such VBM characteristic can be altered by compensated donor-acceptor pairs, thus improve the $p$-type do…
Multilayered thin films prepared with the layer-by-layer (LBL) assembly technique are typically "brittle" composites, while many applications such as flexible electronics or biomedical devices would greatly benefit from ductile, and tough nanostructured coatings. Here we present the preparation of highly ductile multi…
Monte Carlo simulations were carried out to explain experimental results concerning the different structures showed by bimetallic nanoparticles synthesized in microemulsions. It is observed that the difference in reduction rates of both metals is not the only parameter to determine the metal segregation; the interdrop…
Constituting a part of odd electrons that are excluded from the covalent bonding, effectively unpaired electrons are posed by the singlet instability of the single-determinant broken spin-symmetry unrestricted Hartree–Fock (UBS HF) SCF solution. The correct determination of the total number of effectively unpaired ele…
Large-area single crystalline CuTCNQ nanotube arrays (ca. 24 cm 2 ) have been fabricated using an in situ organic vapor solid phase reaction by instantaneous heating (TCNQ = 7,7,8,8-tetracyanoquinodimethane). The size of CuTCNQ nanotubes can tuned by controlling the reaction temperature. The facile approach provides a…
Three-dimensional cubic ordered mesoporous carbons with tunable pore sizes have been synthesized by using cubic Ia3d mesoporous KIT-6 silica as the hard template and boric acid as the pore expanding agent. The prepared ordered mesoporous carbons were characterized by powder X-ray diffraction, scanning electron microsc…
By use of a surfactant templating method, the direct synthesis of magnesia-incorporated mesoporous alumina ( m MgAl-γ) was realized via self-assembly of inexpensive inorganic salts. The structural and basic properties of the obtained materials were well characterized by various approaches. The results show that m MgAl…
In carbon nanotubes (CNTs) with large radii, either metallic or semiconducting, several subbands contribute to the electrical conduction, while in metallic nonarmchair nanotubes with small radii the wall curvature induces a large energy gap. In this paper, we propose a model for the signal propagation along single wal…
Mesoporous silica particulate structures of different morphologies from particles to capsules have been prepared by combining the sol−gel process with the cooperative self-assembly in inverse miniemulsion. We report a novel synthetic approach at room temperature, with low surfactant concentrations (5 and 10 mol %, rel…
Magnetic resonant x-ray scattering experiments have been performed on a single crystal of ${\text{EuFe}}_{2}{\text{As}}_{2}$ at the $\text{Eu}\text{ }{L}_{3}$ absorption edge. The orientation of Eu magnetic moments was directly determined: in the antiferromagnetic (AFM) ordered phase they lay parallel to the crystallo…
Results from molecular dynamics simulations of two viscous molecular model liquids--the Lewis-Wahnström model of orthoterphenyl and an asymmetric dumbbell model--are reported. We demonstrate that the liquids have a "hidden" approximate scale invariance: equilibrium potential energy fluctuations are accurately describe…
BACKGROUND: Diatoms are largely responsible for production of biogenic silica in the global ocean. However, in surface seawater, Si(OH)(4) can be a major limiting factor for diatom productivity. Analyzing at the global scale the genes networks involved in Si transport and metabolism is critical in order to elucidate S…
Hexagonal Yb 3+ -Ho 3+ -Tm 3+ triply doped NaYF 4 nanorods were synthesized via a hydrothermal method using oleic acid as a stabilizing agent. White up-conversion (UC) luminescence consisting of the blue UC radiations at 450 and 475 nm corresponding to the 1 D 2 → 3 F 4 and 1 G 4 → 3 H 6 transitions of Tm 3+ ion, gree…
The flow alignment of a nematic liquid crystal has been studied as a function of temperature, beginning at high temperature in the nematic phase and down to the nematic-smectic A phase transition. The alignment angle is obtained by estimating the twist viscosities by nonequilibrium molecular dynamics (NEMD) methods. T…
The compounds ${\text{Na}}_{2}{\text{Ti}}_{2}{P}_{2}\text{O}$ $(P=\text{As},\text{Sb})$ with anti-${\text{K}}_{2}{\text{NiF}}_{4}$ structure were characterized by magnetic susceptibility, magnetoresistance, Hall coefficient $({R}_{H})$, heat capacity, and thermoelectric power (TEP). These compounds exhibit an anomalou…
Abstract Reaction of (dpp‐BIAN)Mg(THF) 3 ( 1 ) {dpp‐BIAN = 1,2‐bis[(2,6‐diisopropylphenyl)imino]acenaphthene} with one molar equivalent of 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) proceeds with oxidation of the dpp‐BIAN dianion in 1 to the radical‐anion and affords the (dpp‐BIAN)Mg(TEMPO)(thf) ( 2 ) complex. The r…