Materials Literature
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The influence of parent materials on soil properties has long been recognized. Early pedologists and soil geographers based their concepts of soils largely on its presumed parent material. Later, parent material was viewed simply as a factor that influences soil development-an influence that diminishes in importance w…
In the title compound, [Co(II)Cl(2)(C(6)H(10)N(2))(2)], a pair of 3,4,5-trimethyl-pyrazoles act as monodentate ligands. Two Cl(-) anions are also bonded directly to the Co(II) atom, which has a CoN(2)Cl(2) chromophore in a slightly distorted tetra-hedral geometry. The two mol-ecules in the asymmetric unit are related…
Abstract Crosslinked polyurethanes based on a mixture of toluene diisocyanate, polypropylene glycol, trimethylol propane (TMP), glycerol (GLY), and desmophen (DES) were synthesized with various ratios of DES and GLY. Chemical crosslinks were introduced through the hard segment (TMP, GLY) and through the soft segment (…
Due to the size scale of the molecules they work with, chemists are normally limited to indirect means of inducing and controlling chemical reactions. Sometimes, the inherent reactivity and structure of the reactants and the properties of the products such as thermodynamic stability can be relied upon to give the desi…
Abstract All growth methods for single‐walled carbon nanotubes (SWNTs) usually result in a wide distribution of chiral indices (n,m). Bimetallic catalysts can narrow this distribution 1,2 . Here we grow SWNTs by a Co‐Mo catalyst and measure the different chiral distributions for an array of growth parameters. A CoMo‐a…
Abstract Mixed carboxylate complexes of cerium(III) and yttrium(III), [Ce2(OAc)4(salH)2(OH2)4]·4HOAc and [Y2(OAc)4(salH)2(OH2)4]·2H2sal (HOAc, H2sal ≡ acetic, salicylic acids) have been structurally characterized as tetrakis(acetic) and bis(salicylic) acid solvates, respectively. The dinuclear complex components take…
Quantum mechanical properties of unsymmetrical and unfunctionalized trans-stilbene derivatives 1-3, which had been prepared by solid-phase parallel syntheses, were characterized using mPW1PW91/6-311G(d,p) (hybrid HF-DF) calculations. The total electronic energies, normal vibrational modes, Gibbs free energies, and HOM…
Reaction of [(bpy)Pd] $(PF_6)_2$ (bpy = 2,2'-bipyridine) with racemic bis(isonicotinoyl)-1,1'-bi-2-naphtholate (L) in acetone, and followed by addition of chloroform and solvent evaporation allows to form amorphous micro-bowl morphology consisting of $[(bpy)PdL]_2(PF_6)_4$ without any template or additive. In contrast…
We construct a theoretical model for a thermotropic ferronematic (magnetic liquid crystal colloid) in an asymmetric twisted nematic cell, subject to in-plane magnetic fields. At low colloidal concentrations, the nematic director [ncirc] is unchanged by strong fields, the magnetic director [mcirc] principally responds…
Antimicrobial resistant is becoming a major factor in virtually all hospital acquired infection may soon untreatable is a serious public health problem. These concerns have led to major research effort to discover alternative strategies for the treatment of bacterial infection. Nanobiotehnology is an upcoming and fast…
The aim of this work is to study the effect of the addition of a wetting agent to a size solution and to the water used for the pre-wetting to know if it is possible to reduce size content of the yarn with mechanical properties allowing a good ‘weavability’. The effect on the physical and mechanical characteristics of…
The problem of short harmonic capillary waves propagation with small amplitude at the nematic-isotropic interface with Rapini-Papoular model for surface tension is considered. The case of Frank-Oseen approximation is studied then viscosity is isotropic, and equations for director and velocity are independent and they…
The alpha-spectrin SH3 domain (Spc-SH3) is a small modular domain which has been broadly used as a model protein in folding studies and these studies have sometimes been supported by structural information obtained from the coordinates of Spc-SH3 mutants. The structure of B5/D48G, a multiple mutant designed to improve…
Abstract The effects of Nb addition on microstructures and formability in Si‐Al‐Mn TRIP cold‐rolled steels were investigated. These steels were intercritical annealed at 770 °C for 5 min, and isothermally treated at 400 °C for 3 min. Microstructural observation, tensile tests and forming limit diagram (FLD) tests were…
It is found that the effect of electro-optic memory earlier revealed in the liquid crystal (LC) – carbon nanotube (CNT) suspensions can be substantially enhanced by doping the LC with small amount of chiral agent. The induced chirality weakens homeotropic anchoring set by the aligning layers helping CNT network to mai…
Development of the methods to organize zeolite microcrystals into closely packed and uniformly aligned monolayers on various substrates have been pursued viewing microparticles as a novel class of building blocks. We now report that the vertically aligned zeolite monolayer can be applied as novel supramolecularly orga…
Abstract The nonisothermal crystallization kinetics of polypropylene (PP), PP/polystyrene (PS), and PP/PP‐g‐PS/PS blends were investigated with differential scanning calorimetry at different cooling rates. The Jeziorny modified Avrami equation, Ozawa method, and Mo method were used to describe the crystallization kine…
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Proton exchange membrane (PEM) is a main component of the proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs) for transferring protons from anode to cathode as well as providing a barrier to the fuel gas between two electrodes. Some specific limitations for the well- known perfluorinate…
Complementary diaminopyridine–flavin dyads that provide liquid crystalline systems have been synthesised. The mesophases possess well-defined molecular architectures, thermal stability and wide ranges. Furthermore, chiral centres have been introduced to explore the role chirality plays on the end morphology. The intro…