Materials Literature
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The homogeneous and heterogeneous reactions of hafnium (Hf) with boron (B) or carbon (C) powders were studied under non‐self‐propagating high‐temperature synthesis (SHS) conditions in searching for chemically aided processes of ultra‐high‐temperature ceramics at mild and practical conditions. The threshold interaction…
Laser-light-induced surface relief grating inscription was carried out in the newly synthesized azobenzene-functionalized poly(amide-imide)s having the same main- and side-chain structures but different substituents in the azobenzene groups. The gratings were inscribed employing the two-wave mixing technique with line…
Abstract Heck, Stille, Suzuki and three‐component coupling reactions with hydrophobic substrates have been carried out in water. The substrates are initially transformed by a general procedure into a microemulsion, which consists of nearly 90 % water with the aid of sodium dodecyl sulfate and either PrOH or BuOH. The…
The synthesis and characterization of palladium-loaded functionalized mesostructured silicates, designated as Pd-SHSBA-16 and Pd-SHKIT-6, are described. These solids were tested as heterogeneous catalysts for the Suzuki−Miyaura reaction. The materials were characterized by 29 Si NMR, 13 C NMR, nitrogen adsorption isot…
Abstract Poly(amide‐imide) resins are versatile high‐performance polymers used as primary electrical insulation. They can be synthesized by three well‐established methods, of which only two are commercially exploited. Outstanding characteristics include high thermal performance, chemical and abrasion resistance, and l…
Sintering in air was performed on pure and CaO/TiO 2 co‐doped slip cast α‐alumina samples. The relative density/grain size relationship, referred to as sintering path, has been obtained for each composition. Fully dense samples were obtained after an additional hot isostatic pressing (HIP) step on the pure and doped m…
Abstract Poly(ethylene terephthalate) (PET) nanocomposites were prepared by melt‐extruding mixtures of PET and functionalized multiwalled carbon nanotubes (MWNTs) with some interaction with PET molecules. For the functionalization of MWNTs, benzyl isocyanate and phenyl isocyanate with different molecular flexibility w…
This paper addresses a multiscale strategy for the prediction of anhysteretic magneto-elastic behavior and its application to the definition of a magneto-elastic constitutive law for Terfenol-D. The multiscale modeling is based on an energetic procedure at the single crystal scale. Localization and homogenization proc…
Calculations based on density functional theory show that TiC 3 B 2 H 5 multidecker complexes can not only store up to 5.1 wt % hydrogen reversibly in nearly molecular form, but, with an average binding energy of 0.58 eV/H 2 molecule, they also possess the thermodynamics and kinetics of an ideal hydrogen storage mater…
As is known, boron nitride nanotubes (BNNTs) are usually not defect free, and various types of defects can inevitably be formed in the process of tube growth and preparations. While previous studies only considered the chemical functionalization of “perfect” BNNTs by transition metals, there was no report on the inter…
High-frequency dielectric relaxation measurements up to 20 GHz were conducted in aqueous solutions of poly(vinyl alcohol)s (PVAs) to examine their hydration structures and dynamic behavior. Dielectric relaxation spectra of aqueous PVA solutions decomposed well into three sets of the Debye-type relaxation modes. This w…
We discovered pH-induced selective desorption and readsorption of weakly acidic polymers from polyacid or polybase layer-by-layer films. In situ attenuated total reflection Fourier transform infrared spectroscopy confirms the selectivity of polyacid release and shows that film response is caused by pH-induced charge i…
The validity of the Arrhenius equation for dissociative electron attachment rate coefficients is investigated. A general analysis allows us to obtain estimates of the upper temperature bound for the range of validity of the Arrhenius equation in the endothermic case and both lower and upper bounds in the exothermic ca…
We describe the construction of self-assembled double-decker porphyrin arrays built up from two covalently connected trimeric Zn-porphyrin units that are joined together by metal-coordination bonds with diamine ligands. We used three different types of diamine ligands: 1,4-diaza[2.2.2]bicyclooctane (DABCO), 4,4'-bipyr…
Accurate crystal-chemical analysis of complex minerals such as tourmalines belonging to the elbaite-schorl-dravite series was obtained by combining Mössbauer spectroscopy (MS) and structural information. Well-defined relationships were established between the two approaches, leading to a close match of results obtaine…
Information about frequency dependence of complex permeability of silicon steel is a vital input parameter in calculations of transformer winding inductance used for modeling high-frequency behavior (100 Hz–1 MHz). We present two ways of determining small signal complex permeability spectra in frequency domain and com…
A nitric oxide (NO) donor polyester containing multiple S-nitrosothiol (S-NO) groups covalently attached to the polymer backbone was synthesized through the esterification of poly(ethylene glycol) with mercaptosuccinic acid, followed by the nitrosation of the -SH moieties. The polynitrosated polyester (PNPE) obtained…
New types of microfabricated surface-enhanced Raman spectroscopy (SERS) active substrates produced by electron beam lithography and ion beam etching are introduced. In order to achieve large enhancement factors by using the lightning rod effect, we prepare arrays consisting of sharp-edged nanostructures instead of the…
Several experimental works have reported that a single high-energy photon could generate multiple excitons in semiconductor nanocrystals and several theories have been proposed to explain these results. Using a tight-binding method, we calculate the electronic structure of InAs, Si, and PbSe nanocrystals and we invest…
Two different adsorption configurations of benzene on the $\mathrm{Si}(001)\text{\ensuremath{-}}(2\ifmmode\times\else\texttimes\fi{}1)$ surface, the tight-bridge and butterfly structures, were studied using density functional theory. Several exchange and correlation functionals were used, including the recently develo…