Materials Literature
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Microporosity and connectivity of ordered mesopores of SBA-15 silica were studied using nitrogen adsorption and novel methods based on selective pore blocking via organosilane modification, and on the imaging of inverse platinum replica of ordered mesoporous structure. It was found that SBA-15 exhibits a relation betw…
For years, HCs with zero ODP and low GWP have been used as alternative B.A. (blowing agents) in the appliance industries. The improvement of insulation performance and lowering costs are significant factors in the development of R-PU (rigid polyurethane) foams especially blown with HCs. The development of R-PU foam wi…
Based on material parameters of diamond and typical experimental data of inverse temperature dependence of electrical conductivity, the temperature coefficient of the resistance of a semiconducting diamond, has been calculated and combined with classic NTC, and platinum thermistors. The results indicate that a boron-d…
Proton nuclear magnetic resonance absorption spectra and spin-lattice relaxation rates in yttrium dihydride have been measured in the temperature range from 4.2 to 310K at 36.0MHz. The second moment of the resonance line corresponds to the rigid-lattice regime for YH1.99 and its value agrees with the anticipated CaF2…
The spectral and luminescent properties of solutions of perylenetetracarboxylic acid (PTCA), its ionic forms, and its aggregates and complexes with rare-earth ions are studied. The mechanisms of the fluorescence quenching of PTCA upon complex formation are discussed. It is concluded that the complex formation in such…
Methods of local porous layer formation by stain etching in HF : HNO3 : H2O solution have been proposed to form a dielectric isolation of devices. The production cycle includes direct ion implantation into local areas by focused ion beam or standard ion implantation through a resist mask followed by stain etching and…
The surface of polycrystalline diamond films during reactive ion etching in electron cyclotron resonance SF6 and O2 plasmas has been examined by scanning electron microscopy, Raman spectroscopy, and x-ray photoelectron spectroscopy. A SF6 plasma required a high voltage in negative substrate biasing in order to achieve…
The work shows the possibilities of the application of electrochemical impedance and open-circuit measurements in studies of electrochemical anodization processes on silicon and post-anodizing treatments of anodized layers. It is shown that these methods are very sensitive to dynamic processes accompanying the formati…
The B-spline technique is used in the calculation of the exciton ground state energy based on the effective mass approximation (EMA) model. The exciton is confined in CdSe microspherical crystallites with a finite-height potential wall (dots). In this approach, (a) the wave function is allowed to penetrate to the outs…
A material combining both mirror-conjugated and racemic chirality properties is characterized and classified within the context of linear bianisotropic mediums. Planewave propagation in the chosen material is studied with particular emphasis on the interaction of different and no handedness along certain specified dir…
The static and dynamic properties of an amorphous polymer nanofiber are investigated via Monte Carlo simulation. Each nanofiber is composed of rings represented by 50 beads. The results are compared with recent simulation, by a similar method, of a nanofiber composed of linear chains with the same number of beads. The…
Phenolphthalein based polyarylate macrocyclic oligomers were selectively synthesized by an interfacial polycondensation reaction of o-phthaloyl dichloride with phenolphthalein. The high selectivity benefits from the role of phenolphthalein as a color indicator, an efficient phase transfer catalyst, and a preferred con…
The structure of nematic liquid crystal director fields in supramicrometer capillary tubes with square cross-section is studied using polarizing optical microscopy. Frank elastic theory is used to determine theoretical director configurations for this geometry.
The electronic structure of the doped perovskite manganese oxides La1x Srx MnO3 and La1x Bax MnO3 has been investigated by X-ray photoelectron and X-ray emission spectroscopy. By comparing the O K and Mn L X-ray emission spectra with the valence band X-ray photoelectron spectra we could localize the Mn 3d and O 2p sta…
Wide-angle X-ray scattering studies of carbon nanotubes produced by catalytic decompositiou of acetylene on a supported Co catalyst are reported. The X-ray intensities were recorded up to maximum scattering vector K m a x = 2 4 A a n d t h e n F o u r i e r t r a n s f o r m e d t o r e a l s p a c e . Y i e l d i n g…
Crystallization is one of the most critical unit operations in the pharmaceutical industry. Pharmaceutical companies invest solid form of the drug substance. Rapid development of a candidate depends on the ability to produce desired drug substance with consistent properties as early as possible. This paper discusses t…
对青海省都兰县香日德南部东昆仑山区一带侵入于元古界苦海岩群的变形变质闪长岩体同时进行了锆石U-Pb和角闪石<sup>40</sup>Ar-<sup>39</sup>Ar年代学研究. 单颗粒锆石U-Pb年龄为(446.5 ± 9.1) Ma; 角闪石Ar坪年龄为(488.0 ± 1.2) Ma, 等时线年龄为(488.9 ± 5.6) Ma, K-Ar年龄为(462.8 ± 8.8) Ma. 角闪石的K-Ar年龄和良好的<sup>40</sup>Ar-<sup>39</sup>Ar坪年龄及等时线年龄显著高于锆石的U-Pb年龄, 可能为含过剩Ar的结果, 不代表岩石的变形变质年代. 锆石的U-Pb年龄可代表岩体的侵入年代, 表明从格尔…
The existence of "lateral birefringence," i.e., the difference between the refractive index for light polarized parallel to the fiber radius and light polarized perpendicular to the radius in the cross-sectional plane, combined with the existence of electron diffraction contrast "bands" in longitudinal fiber sections…
The studies of superlattices in ferroelectric crystals have made a rapid progress since 1980s. A superlattice is composed of modulated domains on the micron scale, controllable with modern techniques. It reveals a number of novel physical properties of optical and acoustic character. In this paper, we review recent ad…
Abstract An instrumental method is described that enables real-time measurement of in-plane anisotropic liquid absorption in nonwoven fabrics. The system uses variations in electrical capacitance to monitor changes in the liquid absorbed by a fabric as a function of time. In the computer-integrated system, multiple ca…