Porous hollow carbon nanotube composite cages
Mechanically robust, hollow carbon nanotube composite spheres that are permeable to large chemical species were prepared by a layer-by-layer assembly and templating technique.
Materials Literature
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Perfect polar stacking of parallel beloamphiphile layers. Synthesis, structure and solid-state optical properties of the unsymmetrical acetophenone azine DCA
Extraordinary high degrees of polar order can be achieved by a rational design that involves the polar stacking of parallel beloamphiphile monolayers (PBAM). This strategy is exemplified by the acetophenone azines MCA (4-methoxy-4'-chloroacetophenone azine) and DCA (4-decoxy-4'-chloroacetophenone azine). The beloamphi…
Studies of the plume emission during the femtosecond and nanosecond ablation of graphite in nitrogen
Comparative studies of the pulsed laser ablation of graphite in 20mTorr of N2 using both 15ns and 450fs pulses at a wavelength of 248nm are reported. Emissions from the resulting ablation plumes, and from collisions with ablated material and the background N2 gas molecules, have been investigated by wavelength-, space…
Effects of Surface Oxides on the Phosphatability of the High Strength Cold Rolled Steels
It is well known that Si and Mn, the basic alloying elements for steel materials, are susceptible to oxidation and form oxides on the steel surface easily, which has a great influence upon the surface performance of steel sheets such as phosphatability. In recent years, on the other hand, the cold rolled steel sheets…
RICE HUSK ASH SILICA AS A SUPPORT MATERIAL FOR RUTHENIUM BASED HETEROGENOUS CATALYST
Abstract: Heterogeneous ruthenium catalysts supported on silica from rice husk ash (RHA-Ru) was prepared by precipitation using an aqueous solution of metal salt in 3.0 M HNO 3 . The effect of calcination at high temperature upon the surface and bulk structure of the catalyst precursor has been investigated. X-ray dif…
A Linearity Improvement Technique for Thin-film Barium Strontium Titanate Capacitors
A device architecture is proposed to improve the linearity of barium strontium titanate (BST) capacitors while maintaining the tunability and the quality factor. Thin-film parallel plate capacitors are fabricated utilizing the proposed architecture. The measurement results successfully demonstrate the effectiveness of…
Oxidative polymerization of diphenylamine: A mechanistic study
The mechanism of oxidative polymerization of diphenylamine is considered. The kinetic study of diphenylamine polymerization and of the structure and molecular-mass characteristics of the reaction products has shown that the degree of oxidation of intermediates plays the key role in polyrecombination. The relationship…
Functionalized mesoporous dendritic silica hybrids as base catalysts with volatile organic compound elimination ability
A post-synthetic process to create functionalized mesoporous dendritic silicas with a high density of tertiary amino groups is presented. Polyamidoamine periodic dendrimers up to the second generation were grown inside the channels of mesoporous hybrids. The results demonstrate that the novel polyamidoamine dendritic…
Increased layer interdiffusion in polyelectrolyte films upon annealing in water and aqueous salt solutions
As-deposited films of multilayered polyelectrolytes are considered to be non-equilibrium structures. Due to the strong attraction between oppositely charged polyions, polyelectrolyte interdiffusion is thought to be suppressed during the adsorption process. Equilibration is promoted by a decrease of the electrostatic a…
A Novel Plasticizer for the Preparation of Thermoplastic Starch
在这篇论文， ethylenebisfoimamide 被综合并且用作新奇可塑剂让玉蜀黍淀粉准备 .FT 红外表示了的热塑的淀粉(TPS ) thatethylenebisformamide 与本国的玉蜀黍淀粉相比与淀粉分子形成了更强壮、稳定的氢键。X 射线衍射(XRD ) 证明在最本国的拱门的典型 A 风格 crystallinity 是 destructed。由扫描电子显微镜(SEM ) ，本国的玉蜀黍淀粉小粒被证明转到一个均匀体系。在在 RH=33% 被存储为一个星期以后， EPTPS 的机械性能也被学习。到达到 264% 最大可能的延伸。作为新奇可塑剂， ethylenebisformamide 将是实际的扩大 TPS 申…
Enhancement of Plant Growth Activity of Irradiated Chitosan by Molecular Weight Fractionation
キトサンを60Coからのγ線で照射し, 植物生育促進効果を示した100 kGyの放射線分解産物を分離し, 分子量が1～3kDaのフラクションがダイズ, オオムギに高い植物生育促進効果を示すことがわかった。このフラクションの生育活性は分離前 (50mg/L) よりも低い濃度 (20mg/L) で生育を促進することが示された。また, ファイトアレキシンに関与するフィニルアラニンアンモニアリアーゼ (PAL) とキチナーゼ活性を増加させた。放射線分解産物で得られた本フラクションは植物生育のみならず, 防護剤としての作用も示唆された。またこのフラクションはダイズの収量を増加させる効果も示した。
Oxygenated fuels for clean heavy-duty diesel engines
For diesel engines, changing the fuel composition is an alternative route towards achieving lower emission levels. The potential of oxygenated fuels to significantly reduce particulate matter emissions has already been demonstrated earlier. In this study, this research has been extrapolated towards lower emission leve…
Undulation instability in block-copolymer lamellae subjected to a perpendicular electric field
We examine the stability of lamellar stacks in the presence of an electric field, , applied normal to the lamellae. Calculations are performed with self-consistent field theory (SCFT) supplemented by an exact treatment of the electrostatic energy for linear dielectric materials. The calculations identify a critical el…
Unexpected bromination ring-opening of tetraarylporphyrins
An unexpected, mild, efficient bromination ring-opening method has been developed for convenient synthesis of various novel biladienes or brominated porphyrins by controlling the amounts of NBS used.
Trapping Effects in CdSiO 3 :In 3+ Long Afterglow Phosphor
Trapping effects in CdSiO 3 :In 3+ long afterglow phosphor based on photoluminescence (PL) and thermoluminescence (TL) curves are studied. The results of TL show that two intrinsic defects associated with peaks at 346 and 418 K appear in the undoped CdSiO 3 phosphor; whereas only one strong cadmium vacancy V'' Cd defe…
Engineering geological classification of weak rocks
Although weak rocks (meaning the domain of hard soil/soft rock) occur frequently in construction projects all over the world, only few, and mostly unsatisfactory, durability testing methods exist. In various construction projects it became evident that especially slake durability of weak rocks varies strongly from spo…
Effect of composition on the conductivity and morphology of poly(3-hexylthiophene)/gold nanoparticle composite Langmuir–Schaeffer films
Ultrathin Langmuir-Schaeffer (LS) films were fabricated from blends of regioregular poly(3-hexylthiophene) (P3HT) and highly monodispersed dodecanethiolate-capped gold nanoparticles (Au NPs) mixed in varying weight ratios. The morphology of the ultrathin films was investigated by UV-visible absorption spectroscopy, at…
A novel soft hydrothermal (SHY) route to crystalline PbS and CdS nanoparticles exhibiting diverse morphologies
We report a simple and rapid aqueous route to crystalline nanoparticles of PbS and CdS using single-source precursors and a conventional household pressure cooker.
Organo-vermiculites: synthesis, structure and properties. Platelike nanoparticles with high aspect ratio
Organo-vermiculites with large d-spacing, advantageous for the synthesis of polymer nanocomposites, were prepared by exchanging the mineral inorganic cations for quaternary alkylammonium ions. The interlayer Mg2+ of the pristine vermiculite was exchanged by Na+ in advance to enhance the exchange with the organic catio…
Prediction of Scale Formation Problems in Oil Reservoirs and Production Equipment due to Injection of Incompatible Waters
Abstract In this paper, the mechanisms of scale formation from oilfield water are presented. An accurate model for predicting the scaling phenomena due to mixing of incompatible waters, changes in thermodynamic, kinetic and/or hydrodynamic conditions in oilfield operations is suggested. This model can predict scaling…