Materials Literature
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The purpose of this work was to determine the suitability of using instrumentation utilizing sapphire optical fibers in a high‐temperature gamma radiation environment. In this work, the broadband (500–2200 nm, or 0.56–2.48 eV) optical attenuation of commercially available sapphire optical fibers was monitored in situ…
The results of an investigation on the Er doping of porous silicon are presented. Electrochemical impedance spectroscopy, optical reflectivity, and spatially resolved energy dispersive spectroscopy (EDS) coupled to scanning electron microscopy measurements were used to investigate on the transient during the first sta…
Bismuth layer structured ferroelectric ceramics of (1–x)CaBi2Nb2O9–xNa0·5Bi2·5Nb2O9 [(1–x)CBNO–xNBNO, 0≤x≤1·0] ceramics were obtained by conventional solid state reaction method. The effects of Na0·5Bi2·5Nb2O9 (NBNO) addition on the microstructure and electrical properties of ceramics have been studied. X-ray diffract…
ABSTRACT The influence of attaching hydrophobic side groups to a polyelectrolyte, used for deposition of a multilayer oxygen gas barrier thin film, was investigated. Polyethyleneimine (PEI) was labeled with pyrene and deposited in “quadlayers” of PEI, poly(acrylic acid), PEI, and sodium montmorillonite clay using laye…
A semiconducting porphyrin polymer that is solution processable and soluble in organic solvents has been synthesized, and its spectroscopic and electrochemical properties have been investigated. The polymer consists of diarylporphyrin units that are linked at meso-positions by aminophenyl groups, thus making the porph…
The fusion characteristics of poly(vinyl chloride) hybrid nanocomposites containing different amounts of nanocalcium carbonate, wood flour, and nanoclay fillers were investigated utilizing response surface methodology (RSM). Various nanocomposites were prepared through a two‐step mixing process, wherein the minimum an…
The isothermal crystallization and mechanical behavior of biodegradable polycaprolactone (PCL) composites with organic (oleic acid and glycerol monooleate) and inorganic (zinc oxide, organoclay, and hydroxy apatite) additives used alone or simultaneously were investigated. The effect of all additives on the degree of…
ABSTRACT The unusual amino acid l‐3,4‐dihydroxyphenylalanine (DOPA), which was found in mussel adhesive protein, was recognized as crucial element for the adhesive of mussel. In this work, the synthesis of thermoresponsive and photocrosslinkable bioadhesive with ternary networks prepared by incorporating dopamine acry…
ABSTRACT Electrospinning of biodegradable poly(3‐hydroxybutyrate) (PHB)/magnetite and poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV)/magnetite composites in 2,2,2‐trifluoroethanol (TFE) and chloroform are investigated to develop nonwoven nanofibrous structure. Ultrafine PHB/magnetite fibers are obtained and the…
The competing occupancy of cation position by NH 4 + and K + during crystallization produces local distortions in structure, resulting in the difficulties in growing high-quality (K,NH 4 )H 2 PO 4 single crystals with particular mixing concentration. Crystal properties such as structure, defect density, and purity alw…
In this study, three different methods (ion exchange, wet mixing and impregnation) were employed to prepare Cu-modified SAPO-34 molecular sieves. All these freshly prepared catalysts showed excellent activities towards the selective catalytic reduction (SCR) of NO with NH3 (NH3-SCR) no matter which preparation method…
Polarization response and thermally stimulated depolarization current (TSDC) of BaTiO 3 ‐based ceramic multilayer capacitors with Y5V specification were studied. The temperature dependence of dielectric behavior shows that as the dc electric field increases, the polarization response in the whole measurement range (fr…
Cardiovascular disease is a major cause of morbidity and mortality, especially in developed countries. Currently, when suitable autologous tissue is lacking, mostly non-degradable synthetic material or fixated xenogeneic grafts (e.g. heart valves) are used to restore, repair, or replace the injured cardiovascular tiss…
ABSTRACT Polystyrene (PS) is one of the commonly used polymer in food packaging, that is why it generates a large amount of residual PS: because of the need of reduce environmental damage that occurs, it is common to recycle this polymer. Recycling of PS may be affected by the introduction of biodegradable polymer in…
Antibacterial SiO2 hybrid materials based on tetraethyl orthosilicate (TEOS), hydroxypropylmethylcellulose (HPMC) and silver were prepared by the sol-gel method. The content of cellulose derivate was 5 wt% and the silver concentration varied from 0.5 wt% to 2.5 wt%. The amorphous nature, morphology and antibacterial b…
Anionic, conjugated thiophene- and fluorene-based polyelectrolytes with alkylthiosulfate side chains undergo hydrolysis under formation of alkylthiol and dialkyldisulfide functions. The hydrolysis products can be deposited onto gold or silver surfaces by self-assembly from solutions of the anionic conjugated polyelect…
Optical spectroscopy and Judd–Ofelt analysis were performed on a BaY2F8:Sm3+ crystal and used to guide the potential application of BaY2F8:Sm3+ as a laser material. Crystals were characterized by polarized absorption spectroscopy, fluorescence emission, and fluorescence lifetime measurements. The H69/2 and H67/2 manif…
We numerically examine the two-dimensional ordering of a stripe forming system of particles with competing long-range repulsion and short-range attraction in the presence of a quasi-one-dimensional corrugated substrate. As a function of increasing substrate strength or period we show that a remarkable variety of disti…
We demonstrated fast in-plane switching (IPS) of negative liquid crystals by using crossed patterned electrodes. Switching to the bright state can be achieved by applying an in-plane field using the bottom patterned electrodes, whereas switching to the dark state can be obtained by applying an in-plane field using the…
Graphene nanoribbons (GNRs) have received a great deal of attention due to their promise for electronic and optoelectronic applications. Several recent studies have focused on the synthesis of GNRs by the bottom-up approaches that could yield very narrow GNRs with atomically precise edges. One type of GNRs that has re…