Materials Literature
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This article illustrates an experimental study of clay mineral characterization conducted with the aid of the methylene blue "stain" test, which yields a semiquantitative evaluation of the activity of a geomaterial based on the type and quantity of clay minerals contained in it. The properties of clay minerals are des…
A new class of dendrons and dendrimers containing azobenzene units (bearing up to 29 azobenzene groups for four generations) were designed and synthesized with the convergent method, which uses azobenzene derivatives as monomers and benzyl ester groups as linkages leading to photoresponsive dendrons and dendrimers wit…
A series of branched poly(ethyleneimine) (PEI) derived polymers with different lengths of n -alkyl side chains, denoted as PEI( n )Cs ( n = 12, 14, 16, 18, 20, number of carbon atoms in alkyl side group), have been prepared by a N-alkylation method, and systematically characterized by differential scanning calorimertr…
Performance degradation of structural steels in nuclear environments results from the formation of a high number density of nanometre-scale defects. The defects observed in copper-based alloys are composed of vacancy clusters in the form of stacking fault tetrahedra and/or prismatic dislocation loops that impede the m…
A new pyrazinoporphyrazine macrocycle carrying externally appended pyridine rings, tetrakis-2,3-[5,6-di(2-pyridyl)pyrazino]porphyrazine (hydrated), [Py(8)TPyzPzH(2)].2H(2)O, was prepared in high yield by direct cyclotetramerization of the precursor, 2,3-dicyano-5,6-di(2-pyridyl)-1,4-pyrazine, [(CN)(2)Py(2)Pyz], in the…
This paper reports an investigation of the orientational behavior of films of nematic liquid crystal (LC) 4‘-pentyl-4-biphenyl-carbonitrile (5CB) supported on a variety of metal perchlorate salts and their orientational response to dimethyl methylphosphonate (DMMP). It is found that 5CB supported on perchlorate salts…
We report a new theoretical model that accounts for the unusual magnetic properties of the cyanide cluster ([MnII(tmphen)2]3[MnIII(CN)6]2) (tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline). The model takes into account (1) the spin-orbit interaction, (2) the trigonal component of the crystal field acting on the groun…
An extracellular protein with strong absorption at 406 nm was purified from cell-free culture fluid of latex-grown Xanthomonas sp. strain 35Y. This protein was identical to the gene product of a recently characterized gene cloned from Xanthomonas sp., as revealed by determination of m/z values and sequencing of select…
Continuous zirconia fibers with a nanometer ceramic structure and a tensile strength up to 2.8 GPa were fabricated by pyrolyzing polyacetylacetonatozirconium precursor fibers through a special atmosphere heat treatment. DSC‐TGA, GC‐MS, IR, SEM, and TEM were used to study the fiber transformation mechanism during heati…
Abstract A new aromatic asymmetrical ether diamine, 5‐(4‐aminophenoxy)‐1‐naphthylamine, was synthesized through the nucleophilic displacement of 4‐chloronitrobenzene with the potassium phenolate of 5‐amino‐1‐naphthol in dimethylformamide, followed by hydrazine palladium‐catalyzed reduction. A series of novel aromatic…
A completion of the three primary colours (red, green and blue (RGB)) in conjugated polymeric electrochromics is enough to produce any shade of desired colour for plastic displays. Until our first report about a green-coloured neutral conjugated polymer (CP) [G. Sonmez, C. K. F. Shen, Y. Rubin and F. Wudl, Angew. Chem…
The first two steps of methane dissociation on Rh(111) have been investigated using density-functional theory, focusing on the dependence of the catalyst's reactivity on the atomic coordination of the active metal site. We find that, although the barrier for the dehydrogenation of methane (CH4 --> CH3 + H) decreases a…
The effects of different concentrations of Mn 2+ , Mg 2+ , Al 3+ , Fe 3+ , La 3+ , and Nb 5+ on the dielectric and tunable properties of Ba 0.6 Sr 0.4 TiO 3 ceramics were investigated. It was found that doping in small amounts with acceptor ions such as Mg 2+ , Fe 3+ , and Al 3+ could meliorate the dielectric properti…
Laser-ablated Mg atoms react with molecular hydrogen to give magnesium hydrides during condensation in excess hydrogen and neon for characterization by matrix infrared spectroscopy. The observed absorptions are identified by isotopic substitution and theoretical calculations of vibrational fundamentals and assigned to…
The aim of the study is to determine and compare the pharmacokinetics and tissue distribution of Doxorubicin (Dox) delivered as solution or through nanoparticles after intravenous (i.v.) and intraperitoneal (i.p.) injection. Doxorubicin loaded poly(butyl cyanoacrylate) nanoparticles were synthesized by dispersion poly…
Dielectric relaxation and PVT measurements were carried out on propylene carbonate. From these, we show that thermal energy exerts a stronger influence than volume on the temperature dependence of the dynamic properties. Data obtained at all temperatures and pressures superimpose, when expressed as a function of T-1 V…
Microcellular polymer foams afford a wide variety of attributes relative to their dense analogues, and efforts remain underway to establish viable routes to generate foams with substantially reduced pore cell size and increased pore cell density. Barrier constraints are applied in the present work to achieve diffusion…
The achievement of both high strength and high electrical conductivity in bulk materials is challenging in the development of multifunctional materials, because the majority of the strengthening methods reduce the electrical conductivity of the materials significantly. At room temperature, dislocations have little sca…
A system for measuring charge distribution on an insulating spacer is developed. An electrostatic probe is set close to the spacer, and it moves along its surface maintaining a small gap. The accumulated charge is inversely calculated from the measured data by utilizing the relationship that is obtained through the nu…
Aligned single-walled carbon nanotubes (SWNTs) and hierarchical SWNT assembly were fabricated by electrospinning. The high fiber elongation and high DC electric field applied during the electrospinning process result in the orientation of the SWNTs along the axial direction of the fiber. The alignment of the electrops…