Materials Literature
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The dynamics of ethylcyclohexane are investigated by high resolution dielectric spectroscopy aiming to characterize the relevant relaxational features of this simple system in its fluid, supercooled liquid, and glassy states. The dielectric signature of structural relaxation is a primary loss peak with amplitude Delta…
Abstract This paper presents a theory of Cosserat thermoelastic solids with initial stresses, initial couple stresses, and initial heat flux. First, the equations governing the infinitesimal deformations superposed on large deformations of Cosserat thermoelastic bodies are established. Then, a linear theory of prestre…
The theoretical elastic stiffness of ${\mathrm{Y}}_{3}{\mathrm{Si}}_{5}{\mathrm{N}}_{9}\mathrm{O}$, the only Y-Si-O-N quaternary crystal that contains a framework of corner-sharing $\mathrm{Si}{\mathrm{N}}_{4}$ and/or $\mathrm{Si}\mathrm{O}{\mathrm{N}}_{3}$ tetrahedron in three dimensions, was investigated using the f…
Abstract Novel dendralene type cross-conjugate molecules based on 1,3-dithiol-2-ylidene units with thiophene have been prepared. The conjugation in the oxidized stage is mainly through the thiophene core, while the cross-conjugated nature is observed in the neutral state. The CT complex of 2a with TCNQF4 shows moderat…
Mesoporous silica-carbon nanocomposites (C-SiO(2)) were synthesized for the fabrication of highly crystalline silicon carbide (SiC) nanoparticles and nanofibers via carbothermal reduction. SiC nuclei were introduced into the mesopores as seeds by infiltration of preceramic precursor polycarbosilane (PCS) prior to the…
A spinel structure of an oxynitride material in the form ${M}_{3}\mathrm{N}{\mathrm{O}}_{3}$ ($M=\mathrm{B}$, Al, Ga, or In) is considered to be derived from a reaction of the form $M\mathrm{N}+{M}_{2}{\mathrm{O}}_{3}\ensuremath{\rightarrow}{M}_{3}\mathrm{N}{\mathrm{O}}_{3}$. Various possible phases of $M\mathrm{N}$ a…
Abstract A new approach for the fabrication of disposable electrochemical surfaces is presented. Conducting fibers have been produced by a two‐step process. Firstly, a fine web mat composed of nylon‐6 and ferric chloride fibers (with diameters of about 200 nm) were electrospun on a flat collector. Afterwards, the elec…
A facile introduction of alpha,beta- or alpha,beta,gamma,delta-unsaturated ester functions onto porphyrins was achieved through rhodium-catalyzed addition of beta-borylporphyrins to acrylate or 2,4-pentadienoate esters. The reaction of meso-borylporphyrins with acrylates exclusively afforded saturated esters by 1,4-co…
The mass transport of six different aroma compounds (ethyl acetate, ethyl butyrate, ethyl hexanoate, 2-hexanone, 1-hexanol, and cis-3-hexenol) through sodium caseinate-based films with different oleic acid (OA)/beeswax (BW) ratio has been studied. OA is less efficient than BW in reducing aroma permeability, which can…
Periodic nanometer-scale patterning of sub-100 nm catalyst particles on silicon is used to grow carbon nanotubes via chemical vapor deposition from methane. The resulting structures consist of very straight individual single-walled carbon nanotubes that are preferentially aligned along perpendicular directions in the…
Point defects in fumed $\ensuremath{\sim}7\text{\ensuremath{-}}\mathrm{nm}$-sized fumed silica nanoparticles have been studied by $X$-, $K$-, and $Q$-band electron spin resonance (ESR) following $10\text{\ensuremath{-}}\mathrm{eV}$ irradiation. The ${E}^{\ensuremath{'}}$ defects are monitored as a function of post man…
In investigations into the design and isolation of semiconducting nano-objects, the synthesis of a new bisureido pi-conjugated organogelator has been achieved. This oligo(phenylenethienylene) derivative was found to be capable of forming one-dimensional supramolecular assemblies, leading to the gelation of several sol…
High strength aluminium alloys are widely used in the civil and military aerospace industry due to their low weight and high mechanical properties, achieved by selected alloying elements and heat treatments. The resulting multiphase alloy system, a solid solution of alloying elements in the aluminium matrix and a vari…
Ultra-high aspect ratio nanofibers composed of poly(vinyl alcohol) and CoFe(2)O(4) nanoparticles (PVA/CoFe(2)O(4)) and moderate aspect ratio nanofibers composed of poly(vinyl chloride) and Fe(3)O(4) nanoparticles (PVC/Fe(3)O(4)) have been prepared. Magnetopolymeric one-dimensional (1D) nanostructures with any diameter…
A nonvolatile ferroelectric complementary metal-oxide-semiconductor (CMOS) circuit with both logic and memory functions is proposed as a new application of ferroelectric field effect transistors. The logic and memory operations of a NOT-logic ferroelectric CMOS device is demonstrated. Nondestructive readings of high a…
Quantum theoretical calculations are presented for CO attached to charged and neutral Au and Au(2) with the aim to test the performance of currently applied density functional theory (DFT) by comparison with accurate wave-function based results. For this, we developed a compact sized correlation-consistent valence bas…
We have studied xenon and argon bubbles formed in the subsurface region of Al(111) by x-ray photoelectron spectroscopy. As a consequence of the nanometer size of the bubbles, the photohole formed by $\mathrm{Xe}\phantom{\rule{0.2em}{0ex}}3d$ or $\mathrm{Ar}\phantom{\rule{0.2em}{0ex}}2p$ photoemission is screened by th…
Gold-loaded zirconia and sulfated zirconia catalysts were tested in the low-temperature water gas shift reaction. The samples were characterized by N2 adsorption analysis, temperature-programmed reduction, X-ray diffraction, pulse-flow CO chemisorption, FTIR spectroscopy, and high-resolution transmission electron micr…
We describe herein a synthetic technology for precise size control of monodispersed hybrid gold nanoparticles, which combines seeding growth and digestive ripening. In this procedure, alkyl amines allow the solubilization and thermal reduction of HAuCl(4) while 2.1 nm gold nanoparticles capped by thiol functions are u…
We developed ZnO nanoparticles highly dispersed in an amorphous matrix of Al-rich compound without aggregation. A precursor double salt containing Zn and Al was first precipitated from an aqueous solution followed by calcination at 250 °C. Partial decomposition of the salt gave rise to crystallization of ZnO nanoparti…