Materials Literature
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The synthetic compounds of Sb 3+ ion‐substituted lanthanide aluminum garnet doped with cerium powders have been prepared by solvothermal method at 230°C and then calcined at 1500°C. These particles have spherical morphology with an average size of about 2 μm, which indicates the good luminescent characteristics. Tb 3…
采用静电纺丝法制备了孔径为40~150 nm的PLLA纳米孔结构超细纤维，纳米孔不仅分布在纤维表面，而且存在于纤维内部.通过扫面电镜观察了纤维表面形貌.探讨了混合溶剂二氯甲烷/N,N二甲基甲酰胺的比例、PLLA浓度、电场强度对PLLA纤维纳米孔大小、分布密度、深度的影响.结果表明通过调节PLLA溶液性质和纺丝参数，PLLA纤维的表面形貌可以在3种状态即光滑无孔、疏浅凹坑、密集深孔之间可控.二氯甲烷/N,N二甲基甲酰胺比例为1∶4，PLLA浓度9%，电场强度1 kV/cm，环境温湿度分别为30℃和52%，静电纺丝所得PLLA超细纤维表面孔洞直径为150 nm，孔洞分布密集.纳米孔PLLA纤维形成的主要机理是由于静电纺丝过程中溶剂…
A radiological survey has been carried out in the island of Ikaria based on the natural radionuclide inventory in abiotic environment and the consequent dose rate assessment for the critical groups of population. The island of Ikaria-Aegean Sea, Greece is characterised by the presence of mineral and thermo-mineral spr…
Abstract High‐performance hyperbranched poly(phenylene oxide)‐modified bismaleimide resin with high thermal stability, low dielectric constant, and loss was developed, which is made up of hyperbranched poly(phenylene oxide) (HBPPO), 4,4′‐bismaleimidodiphenylmethane (BDM), and o, o′‐diallylbisphenol A (DBA). The curing…
Research on four types of self-assemblies (micelles, coacervates, gels, and vesicles) is discussed via a particular investigative methodology (in order of appearance): kinetics, dynamic NMR, PGSE-NMR, double-(13)C labeling, molecular dynamics computations, phase diagrams, cryo-HRSEM, rheology, light/electron microscop…
Size dependence effects in semiconductor clusters have been a subject of extensive studies for the last two decades. However, it is still difficult to employ the existing theoretical models to give reliable results of energies for clusters in the whole nanometer region. Here we offer a new theoretical method for the q…
We have carried out a systematic investigation of encapsulation of Al n clusters for n = 1−13 inside armchair single walled carbon nanotubes (SWCNTs)(m,m) of varying diameter using density functional theory calculations. The effect of confinement was studied on the Al n geometries which shows linear structures for n ≤…
Lead‐free piezoelectric ceramics of 0.94(K 0.5 Na 0.5 )NbO 3 –0.06LiNbO 3 (0.94KNN–0.06LN) were prepared by an ultrasonic irradiation method. X‐ray diffraction, thermal analyses, and X‐ray photoelectron spectroscopy were used to evaluate the effects of different ultrasonic powers on the structural and electrical prope…
Lead sulfide (PbS) nanoparticles have been synthesized in aqueous solutions by a reaction between inorganic lead salts and sodium sulfide and stabilized using the cationic polyelectrolytes branched poly(ethylenimine) (PEI), poly(allylamine hydrochloride) (PAH), and poly(diallyldimethylammonium chloride) (PDDA). The st…
This study evaluates an alternative to electron-beam lithography for fabricating nanoscale graphene devices. Dip-pen nanolithography is used for defining monolayer graphene flakes and for patterning of gold electrodes through writing of an alkylthiol on thin films of gold evaporated onto graphene flakes. A wet gold et…
Self-assembled, chair-shaped dirhenium(I) macrocyclic compounds featuring the two different bis-chelating quinone dianions (1, L = dhnq(2-); 2, L = dhaq(2-); H(2)dhnq = 6,11-dihydroxy-5,12-naphthacenedione; H(2)dhaq = 1,4-dihydroxy-9,10-anthraquinone) that interface with two fac-Re(CO)(3) cores and a ditopic semirigid…
This article reports and applies a recently discovered programmable multimaterial deposition process to the formation and combinatorial improvement of 3D nanostructured devices. The gas-phase deposition process produces charged <5 nm particles of silver, tungsten, and platinum and uses externally biased electrodes to…
Abstract Styrene–butadiene rubber (SBR) vulcanizates were prepared using plasticizers including the four liquid types of styrene–butadiene copolymers (LPSB), polybutadiene (LPB), polyisoprene (LPI), and the hydrogenated polyisoprene (LHPI) as well as the conventional process oil, and their phase‐separated structures a…
Abstract In this work, sodium montmorillonite clay was added, as filler, to nanocomposites of natural rubber (NR) and cellulose II (regenerated cellulose) in amounts varying from 0 to 5 phr (per hundred resin). Natural rubber (NR)/cellulose II/montmorillonite nanocomposites were prepared by co‐coagulating NR latex, mo…
Abstract Extraction characteristics are shown for trioctylphosphine oxide (TOPO) dissolved in alkane for recovery of acetic acid from dilute water solution and hardwood-derived hemicellulose extracts. The recovery of acetic acid with TOPO is significantly influenced by the pH in the aqueous phase and lightly affected…
Abstract An intumescent flame retardant system composed of ammonium polyphosphate (APP) and pentaerythritol (PER) was used for flame retarding ethylene–propylene–diene‐modified elastomer (EPDM)/polypropylene (PP) blends. Cerium phosphate (CeP) was synthesized and the effect on flame retardancy and thermal stability of…
Reversible switching of an optical gate switch in a Si waveguide including a thin Ge2Sb2Te5 phase-change material layer is reported. The phase-change was triggered by 660 nm laser pulse irradiation onto the Ge2Sb2Te5 layer with no structural damage. The switching time from the initial amorphous state to the crystallin…
Alkoxy benzoic acids are well-known liquid-crystalline compounds with nematic phase of long thermal ranges. The refractive indices measurements are carried out using a wedge-shaped cell with the help of a modified spectrometer. The birefringence (δn = ne − no) is obtained directly by using the method developed by Kucz…
Density-functional-theory calculations have been used to examine stabilization of the low density $\mathrm{BCT}$ polymorph by epitaxial strain. The relative energies of $\text{B}4$ and $\mathrm{BCT}$ polymorphs were calculated for ZnO, ZnS, and CdS, as a function of epitaxial strain, for a $\text{B}{4}_{[0001]}\ensure…
Heat conduction in three-dimensional anharmonic lattices was numerically studied by the Green-Kubo theory. For a given lattice width W, a dimensional crossover is generally observed to occur at a W-dependent threshold of the lattice length. Lattices shorter than W will display a 3D behavior while lattices longer than…