Materials Literature
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The temperature dependent local structure of $\mathrm{Tb}{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ was determined by x-ray-absorption spectroscopy. An anomalous Tb-O distribution is found. At high temperature, it is broad but resolves into two distinct peaks below $\ensuremath{\sim}180\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.…
Abstract Unique deterioration with a periodical striped pattern on the injection moldings of polypropylene/rubber blends is reported. After exposure to ultraviolet irradiation with a sunshine fade meter, striped patterns appeared on the injection moldings along the flow direction of the molten resin during the filling…
We report differential scanning calorimetric (DSC) and dielectric measurements on the nematic-isotropic transition in the bulk and aerosil composites of a liquid-crystal mixture having a photoactive guest azobenzene compound in a non-photoactive host, 4-n-heptyl cyanobiphenyl (7CB). The DSC scans taken at different co…
Abstract Efforts have been successful to crystallize the electroceramic compound of cadmium tartrate through silica hydrogel. Analysis of thermograms reveals decomposition of the crystals to take place within the temperature range 65 to 442°C in air atmosphere. Some important characteristic data, i.e., valance electro…
Abstract The present study is to examine the photo‐stabilization effect of an antioxidant on the photo‐oxidation of ethylene‐propylene‐diene monomer (EPDM)–clay nanocomposites. During the preparation of EPDM–clay nanocomposites via melt processing antioxidants are usually incorporated along with clay, which allows phe…
Abstract Recycling discarded rubber is important for both environmental and economic reasons. One of the most attractive methods of recycling rubber waste is to use ground rubber (GR) as a compounding ingredient or as a replacement for raw polymers. In this study, ground natural rubber was prepared with different curi…
Abstract Low dielectric constant (low‐ k ) nanocomposite thin films have been prepared by spin coating and thermal cure of solution mixtures of one of two organic low‐ k thermoset prepolymers and a silica nanoparticle with an average diameter of about 8 nm. The electrical, the mechanical, and the thermomechanical prop…
The effect of mineral matter on the NO reduction efficiency during the coal reburning process was studied in an entrained flow reactor. Apart from the homogeneous reactions between hydrocarbon radicals and NO, the heterogeneous reaction between NO and char is also important in the coal reburning process. The discrepan…
The adsorption of oxygen atoms on the Ti(0001) surface is investigated by the use of ab initio total-energy density-functional methods within the generalized gradient approximation. Two kinds of supercell model (a single-layer and a multiple-layer adsorption model) are designed to study the preference of occupation si…
The Cu-H complex in ZnO consists of Cu on Zn site and a hydrogen atom bound to a nearby O atom, with the O--H bond oriented in the basal plane of the hexagonal lattice to the $c$ axis. The motion of hydrogen in the Cu-H complex is studied by the stress-induced dichroism. Stress applied at room temperature along $[1\ov…
Abstract This paper describes a study on the process of lactose crystallization using a water‐acetone solution. The selection of lactose was based on its significance for the pharmaceutical and food industries and on the fact that the crystallization of this organic compound has been little studied and is, unlike inor…
This paper reports the influences of the post-sintering annealing in argon and uniaxial compressive pre-stress on the giant dielectric properties of the CaCu 3 Ti 4 O 12 ceramics sintered at 1100 °C in air for 6 and 16 h. The CaCu 3 Ti 4 O 12 ceramic sintered at 1100 °C for 6 h exhibited high ε ' of ∼1 × 10 4 whereas…
Abstract Organic–inorganic hybrid coatings were formulated using multifunctional vinyltrimethoxysilane (VTMS) oligomers and acrylated polyester (AP). A radical photoinitiator was added to the VTMS/AP formulation and the films were crosslinked via UV‐radiation. The viscoelastic, thermomechanical, and surface properties…
This paper describes a polymer fiber-based approach for the immobilization of homogeneous catalysts. The goal is to generate products that are free of catalysts which would be of great importance for the development of optoelectronic or pharmaceutical compounds. Electrospinning was employed to prepare the non-woven fi…
A novel phenomenon called the photoelastic effect had been observed in ZnO nanorods, along with a number of intriguing anomalies. With increasing excitation power, it was found that the A 1 (LO) phonon exhibited a red-shift in frequency, on top of a blue-shift in the photoluminescence (PL) peak energy. In addition, th…
Abstract A biodegradable thermoplastic starch (TPS) was successfully prepared from plasticizer ethanolamine and native cornstarch. The hydrogen bonding interaction between starch and ethanolamine was investigated using Fourier transform infrared (FT‐IR). When the ethanolamine mass content was 30%, after the ethanolami…
Abstract Plasticizers play a key role in the formulation of polymers and in determining their physical properties and processability. This study examines the effects of citrate esters, triethylcitrate, and triacetine as plasticizers on the thermal and mechanical properties of poly(methyl methacrylate). The samples wer…
Luminescence functionalization of ordered mesoporous MCM-41 silica was realized by depositing a YVO 4 :Eu 3+ phosphor layer on its surface via the Pechini sol–gel process. This material, which combines the mesoporous structure of MCM-41 and the strong red luminescence property of YVO 4 :Eu 3+ , has been studied as a h…
Abstract Phenylalanine [C 9 H 11 NO 2 ] is one of the essential amino acids in humans. DL‐phenylalanine was crystallized in silica gel under suitable pH conditions by reduction of solubility method. The grown crystals were characterized by density measurement and X‐ray powder diffraction. Fourier transform infrared sp…
The first ab initio molecular dynamics simulation of a Gd(III)-based contrast agent in explicit aqueous solution at ambient conditions as used in the actual magnetic resonance imaging of human bodies is presented. The description of the structure of this chelate complex is considerably improved with respect to typical…