Materials Literature
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Solutions of xanthan gum form a strong gel in the presence of metal ions. The gelation process of a low concentration xanthan solution in the presence of aqueous aluminum ions (Al(III)) was followed as a function of temperature. Thermal gelation was observed at 44 ± 2 °C by the onset of heterodyne and nonergodic behav…
The synthesis and electrochemical and spectroscopic properties of bis-dirhodium complexes containing ap or dpf bridging ligands, (ap)(4)Rh(2)(C triple bond C)(2)Rh(2)(ap)(4) (2) and (dpf)(4)Rh(2)(CNC(6)H(4)NC)Rh(2)(dpf)(4) (4), were investigated (where ap and dpf are the 2-anilinopyridinate and N,N'-diphenylformamidin…
The interfacial interaction between PAN-based IM7 carbon fibers and Avimid K3B, a thermoplastic polyimide resin was investigated using core and valence band X-ray photoelectron spectroscopy (XPS). The extent of interaction between the fiber and the matrix material has a significant effect on the strength of the ultima…
Polymeric [CuII(SQMe−SQMe)]n has been prepared with a bridging 4,4‘-bis(semiquinone) ligand. Temperature-dependent magnetic properties result from ferromagnetic and antiferromagnetic coupling interactions involving the metal and the diradical ligands. Monomeric (bpy)CuII(CatMe−BQMe) and (PPh3)2CuI(SQMe−BQMe) show that…
This study demonstrates for the first time that porous zeolite films with surface patterns such as knotted-rope web and wrinkled honeycomb can be obtained by convection-assisted dynamic self-assembly of zeolite nanoparticles. The study also shows that an appropriate dispersant and the presence of zeolite nanoparticles…
Carbonaceous compounds deposited on aluminosilicate mesoporous molecular sieves of the MCM-41 type during conversion of cyclohexene at various temperatures were investigated using TGA; DRIFT, UV−vis, and 13 C solid state NMR spectroscopies; and a sorption technique. The chemical composition of the deposits is not sign…
The effectiveness of power ultrasound as a viable alternative for destroying pathogenic organisms in homogeneous and heterogeneous mixtures of aqueous solutions was investigated. The method involved monitoring of total coliform bacteria during sonication of E. coli suspensions in the absence and presence of equivalent…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
${\mathrm{C}}_{20}$ cages consisting only of pentagons have been synthesized in a gas phase. [H. Prinzbach et al., Nature (London), 407, 60 (2000)]. By performing first-principles calculations, we have found that the ${\mathrm{C}}_{20}$ cages can form condensed phases in several dimensions. The most stable phase among…
Electronic states of an isolated nano-object made of single graphene layer have been successfully explored by means of electron energy-loss spectroscopy with high sensitivity and high spatial resolution. In further systematic study of various carbon nanostructures, the curvature and/or the interlayer coupling between…
Boundaries and interfaces in materials - introduction principles governing grain shape and size size and orientation of grains energy polycrystalline materials diffusion structure of boundaries and interfaces composition of boundaries and interfaces electronic structure strength of grain boundaries grain boundary comp…
Two-dimensional nanoparticle cross-linked networks were constructed by using the Langmuir−Blodgett technique, where neighboring particles were chemically bridged by bifunctional linkers at the air/water interface. The cross-linking process was effected at high surface pressures by ligand intercalation and surface exch…
This report describes a convenient method for in situ polymerization of the environmentally responsive polymer, poly( N -isopropylacrylamide) (PNIPAAM), on the surfaces of azo-initiator-derivatized self-assembled monolayers (SAMs) of ω-terminated alkanethiolates on gold. In contrast to previous methods for initiation…
A general calculation of high pressure induced transition temperature (T c) increases for oxide superconductors gives a good description for the Hg-Ba-Ca-Cu-O system. Predictions are made of the maximum T^ cP theo =163, 154, and 111K compared with T^ cP exp = 164, 154, and 118K respectively for the superconducting pha…
The toughness and ductility of ultrahigh-strength alloys is often limited by intergranular embrittlement, particularly under conditions of unfavorable environmental interactions such as hydrogen embrittlement and stress corrosion cracking. Here we investigated the mechanism by which the segregated substitutional addit…
Hysteresis and the non-equilibrium dynamic phase transition in thin magnetic films subject to an oscillatory external field have been studied by Monte Carlo simulation. The model under investigation is a classical Heisenberg spin system with a bilinear exchange anisotropy in a planar thin film geometry with competing…
The empty space in different crystalline and clathrate phases of syndiotactic polystyrene (s-PS) is evaluated by a numerical procedure. It is shown that the δ form is nanoporous and includes two identical cavities per unit cell, whose shape and volume are characterized. As a consequence of clathration, the unit cell o…
The surfaces of hydrophilic (P25) and hydrophobic (T805) TiO 2 particles were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) to gain a better understanding of the adsorption mechanism of OLOA 370 (polybutene-succinimide pentamine) on TiO 2 particles dispersed…
We report the synthesis of alpha-AlReSi and show that it is a 1/1-cubic approximant phase of the icosahedral quasicrystal with a = 12.9 A. The trend of the resistivity of the new approximant phase shows a nonmetallic character, similar to those seen in the stable icosahedral phases. The resistivity depends sensitively…
Crystals of ${\mathrm{RbMnCl}}_{3}$ doped with ${\mathrm{Yb}}^{3+}$ exhibit a strong orange luminescence under near-infrared ${\mathrm{Yb}}^{3+}$ excitation at 10 K. The broad emission band extending from 17 200 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ to 13 000 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ is identifi…