Materials Literature
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This study focuses on luminescent materials based on the antenna effect and prepared by the sol−gel method. These materials are composed of a Eu(III) complex (luminescence center) entrapped in a xerogel matrix. Luminescence properties of the lanthanide-based emitting materials depend on the efficiency of energy transf…
The ferromagnetic phase in La0.7Sr0.3MnO3 manganite is completely spin polarized (100%) at room temperature. This is demonstrated on high quality epitaxial films by Spin-Polarized Scanning Tunneling Microscopy. The films consist of a highly homogeneous ferromagnetic (FM) phase in which minority paramagnetic (PM) defec…
The view that the large red shifts seen in the UV-visible absorption bands of peripherally crowded nonplanar porphyrins are the result of nonplanar deformations of the macrocycle has recently been challenged by the suggestion that the red shifts arise from substituent-induced changes in the macrocycle bond lengths and…
The (1x1) terminated (0001)-Zn surface of wurtzite ZnO was investigated with scanning tunneling microscopy. The surface is characterized by the presence of nanosized islands with a size-dependent shape and triangular holes with single-height, O-terminated step edges. It is proposed that the resulting overall decrease…
Geometrical validation around the Calpha is described, with a new Cbeta measure and updated Ramachandran plot. Deviation of the observed Cbeta atom from ideal position provides a single measure encapsulating the major structure-validation information contained in bond angle distortions. Cbeta deviation is sensitive to…
Abstract For Abstract see ChemInform Abstract in Full Text.
In this study, polyurethane composites were produced with rice husk (RH) with polypropylene glycol, molecular weight (Mw) of 400 (PPG400) used as polyols. The effect of percentage of RH (by weight), percentage of RH hydroxyl (OH) groups, and RH size on the flexural, tensile, and impact properties were investigated. Fo…
Seven aromatic dicarboxylic acids were esterified by melt polycondensation in two steps with 1,3‐propanediol (1,3‐PDO) in the presence of tetrabutoxytitanium as catalyst. The acids used were: terephthalic (TPA), isophthalic (IPA), naphthalene‐2,6‐dicarboxylic (2,6‐NDA), naphthalene‐1,4‐dicarboxylic (1,4‐NDA), biphenyl…
Abstract Tetranuclear and hexanuclear nickel(II) complexes with N,N′-bis(2-hydroxy-3,5-dimethylbenzyl)-N,N′-dimethyl-1,2-ethanediamine (H2L), [Ni4L2(CH3COO)4]·4THF and [Ni6L3(OH)4(NO3)2(H2O)2]·2DMF, have been synthesized and characterized by X-ray crystallography, electronic spectroscopy and magnetic susceptibility me…
Kenaf–thermoplastic natural rubber (Kenaf–TPNR) composites were developed and evaluated in this study. The kenaf was blended with TPNR and maleic anhydride-grafted polypropylene (MAPP) as a compatibilizer in an internal mixer (Brabender). The mechanical properties of the composites were investigated by tensile, impact…
Abstract For Abstract see ChemInform Abstract in Full Text.
The authors present simulation results, an experimental technique, and a model for estimating the temperature rise and time-to-failure (TTF) of interconnect. They introduce the concept of derating factor for electromigration TTF due to self-heating. The derating factor is the factor by which the lifetime is reduced by…
We demonstrate, and review the very small, but growing body of literature regarding a recently discovered application of layered compounds, which involves the ability of layered materials to sequester and later release molecules of chemical and biological significance. The application relies upon intercalation chemist…
The temperature evolution of the static order parameter of α-quartz and its soft-mode frequencies were determined at temperatures below 300 K. While these parameters follow classic Landau theory at higher temperatures, quantum saturation was found below room temperature with a characteristic quantum temperature of 187…
Selective removal of metal cores from core–shell Ag@ZrO2 (ZrO2 coated Ag) and Au@ZrO2 (ZrO2 coated Au) nanoparticles result in stable and freely suspendable oxide nanobubbles of varying dimensions, both in thickness and in diameter. The metal core is removed by a newly found reaction in which halocarbons, generally ch…
A push-pull actuator for commanding the motion of the interphalangeal joints of anthropomorphic robotic hands is proposed. The actuator, based on coil springs, made of the shape-memory alloy Nitinol, is compact enough to be easily incorporated into the phalangeal structure of a robotic finger, thus eliminating the com…
The reaction of various highly substituted lanthanide(III) and -(II) aryloxide complexes with trimethylaluminum (TMA) was investigated. The solvent-free, π-arene-bridged dimers [Ln(OAr i Pr,H ) 3 ] 2, derived from the ortho- i Pr 2 -substituted aryloxide ligand OC 6 H 3 i Pr 2 -2,6, form bis-TMA adduct complexes, Ln(O…
The electromigration of Al-1%-Si interconnects under bidirectional (BC) and pulsed unidirectional (PDC) signals is discussed. The effect of signal asymmetry, duty cycle and frequency on the damage generation rate has been tested. The data suggests that the equivalent DC current of a non-DC signal is given by the avera…
Purification of naphthalene from naphthalene-rich oil of coal tar distillates was explored by using the melt and solution crystallizations. The solid–liquid equilibrium of naphthalene–benzothiophene–methanol and naphthalene–benzothiophene systems were investigated. The crystal growth rates were characterized by supers…
A model of dipole fluid for ionic liquids similar to molten NaCl is proposed. The estimates for the critical parameters are obtained with the help of the van der Waals equation of state. The influence of the rotation on the characteristics of a dipole pair and the location of the critical point is discussed. The disso…