Materials Literature
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A series of novel symmetrical and unsymmetrical triphenylene‐based discotic liquid crystalline materials with one or six branched peripheral alkoxy chains have been prepared. These materials have been compared with analogous known symmetrical and unsymmetrical compounds to reveal a balance between steric and space‐fil…
Nd and Mn were codoped into ZnO films which have been grown on a-plane sapphire substrates by pulsed laser deposition with the thickness ranging between 46 and 971 nm. The room temperature resistivity of the codoped films is independent of film thickness. Large positive magnetoresistance and clear anomalous Hall effec…
The Raman spectra of the ethylene-propylene copolymers (EPC) synthesized using new metallocene catalytic systems and the polypropylene/polyethylene/diblockcopolymer of propylene and ethylene (PP/PE/DBC) blends obtained using the sequential polymerization are studied. The copolymer and reactor blend spectra are analyze…
High resolution electron energy loss spectroscopy (HREELS) is a powerful method for the study of vibrational and electronic excitations at solid surfaces and has been extensively applied to metal single crystal surfaces. As a result of experimental difficulties, unfortunately, much less information is available on ads…
Although the industrial development of complex metallic alloys (CMAs) and quasicrystals (QCs) has remained quite limited so far, these materials exhibit interesting and sometimes unexpected properties in terms of technological applications. A few selected examples of the most promising properties and trends for potent…
Abstract Heterotrinuclear [(NiIIL)2LnIII(NO3)] complexes (where H3L = 1,1,1-tris[(salicylideneamino)methyl]ethane and Ln = Gd (1), Eu (2), Tb (3), and Dy (4)) were prepared by treating [Ni(H1.5L)]Cl0.5 with Ln(NO3)3·6H2O in the presence of triethylamine. Complexes 1·2CH3OH, 3·2CH3OH, and 4·C2H5OH·0.5H2O crystallized i…
X‐ray diffraction (XRD) and electron microscopy investigations have been performed on Sc 2 O 3 ‐stabilized ZrO 2 as‐sintered and after aging in air or in wet‐forming gas at 850°C for 1000 h. Some tetragonal to monoclinic transformation had occurred in the near‐surface regions of 4 mol% Sc 2 O 3 samples after aging; th…
Application of a magnetic field offers an incisive opportunity to tune competing interactions in complex materials. Here we probe field-induced changes in the local structure of DyMn2O5 by using magnetoinfrared spectroscopy. The high tunability of the dielectric constant and ferroelectric polarization with field is we…
The electrical conductivity of nanoporous gold was measured in situ during the charging and decharging of the surface of the metal. The nanoporous gold samples were prepared by the process of selective dealloying of Ag from Au–Ag alloy. Charge was induced on the surface by making the sample a working electrode in an e…
Luminescence color multiplexing is one of the most intriguing benefits, which might occur by using semiconductor Quantum Dots (QDs) as labels for biomolecules. It was found, that the luminescence of QDs can be quenched, and replaced by a luminescence peak at approximately 460 nm on hybridization with certain regions o…
Frequency characteristics and their dependence on charge voltage for a packed electric double layer capacitor (EDLC), which consists of a series of connected EDLC cells, are characterized and modeled based on small ac signal analysis. The results indicate that rated capacitance of a packed EDLC is valid only at freque…
The mechanical threshold stress plasticity model of Follansbee and Kocks was designed to predict the flow stress of metals and alloys in the regime where thermally activated mechanisms are dominant and high temperature diffusion effects are negligible.In this paper we present a model that extends the original mechanic…
Response surface methodology (RSM) was used to obtain a more systematic understanding of the electrospinning conditions of polyamide 6 solutions. This method was used to establish a quantitative basis for the relationships between the electrospinning parameters such as applied electric field, the polymer concentration…
Pyrolyses of chemical precursor systems composed of zirconium or hafnium powders dispersed into blends of the polymethylcarbosilane and poly(norbornenyldecaborane) preceramic polymers provide simple efficient routes to new types of ZrB 2 /ZrC/SiC and HfB 2 /HfC/SiC composites. Further extensions of this method should…
The results of investigation of the complex permittivity and permeability of polymer composite materials with different magnetic fillers in the frequency range of 1 MHz to 10 GHz are presented. The possibility of controlling the frequency characteristics of permeability and permittivity and the absolute values of thes…
The structural environment of substitutional Cr 3+ ion in a natural pyrope Mg 3 Al 2 Si 3 O 12 has been investigated by Cr K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) coupled with first-principles computations. The Cr-O distance is close to that in knorringi…
Since the discovery of vulcanisation, rubber has become an indispensable material for the technological development of civilisation, starting from a simple balloon to complex rocket propellant. Rubber Industry worldwide is using on an average 50% of raw materials. These materials are mostly petroleum-based, except nat…
A novel ldquoshunt attachrdquo configuration for chip-scale thermoelectric (TE) generation of electric power from microprocessor waste heat is described, modeled, and parametrically analyzed. The generated electricity is used to drive a cooling fan that convectively cools the chip. A prototype using heat-driven coolin…
Aluminum oxide nanopowders are prepared by the gas phase method and characterized according to the particle sizes and the phase composition. Samples of the nanostructured ceramic material are produced by pressing and annealing in air. The photoluminescence and cathodoluminescence spectra of the Al 2 O 3 nanostructured…
Abstract The influences of inorganic phosphates, as residuals and/or impurities within starch, on the adhesion of acid‐treated cornstarch phosphates to cotton and polyester fibers were investigated for warp sizing. The phosphate impurities considered included sodium dihydrogenphosphate, sodium hydrogenphosphate, sodiu…