Materials Literature
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Diaminotriazines are known to self-associate in solution, in the solid state, and on surfaces via characteristic hydrogen bonding motifs. Although complementary hydrogen bonding between diaminotriazine derivatives and carboxylic acids has been shown to induce mesomorphic properties, the hydrogen-bonded self-associatio…
Cellulose acetate, cellulose nitrate, polyamide, polyethersulfone and polypropylene membranes have been used as templates in which sol–gel chemistry was conducted to fabricate porous metal oxide films. Dilution of the metal alkoxide solution allowed for variation in the total amount of inorganic deposited per membrane…
The 1∶2 complex of α-D-glucose and p-tolylboronic acid (1) crystallizes in α-glucofuranose form at room temperature in P212121 space group with one molecule in the asymmetric unit (Z′ = 1). Data collection at 100 K afforded a modulated structure in P21 space group and Z′ = 2. Interestingly, C–H⋯O interactions are show…
Five malonate-containing copper(II) compounds of formula {[A(H2O)n]2 [Cu(mal)2(H2O)m]} [A = Li (1), Na (2), K (3), Rb (4) and Cs (5); H2mal = malonic acid] have been synthetized and characterized by X-ray diffraction. The structure of these compounds consists of bis(malonate)cuprate(II) anions and alkaline cations tha…
A series of novel dendrons serving as surfactants for surface modification of montmorillonite (MMT) have been synthesised via a convergent approach. The most distinguishing characteristic of the prepared dendrons is the long alkyl chain at the periphery. This would certainly bring about good solubility, high yield and…
A polyglycerol with dendritic structure (PGLD) was synthesized by ring-opening polymerization of deprotonated glycidol using a polyglycerol as core functionality in a step-growth process. Then, PGLD reacted with O-carboxymethylated chitosan to obtain PGLD-chitosan dendrimer (PGLD-Ch). After the reaction of PGLD-Ch wit…
Examination of fracture toughness has been performed a commercial Mg-Zn-Zr alloy, ZK60, with fine strengthening particles. The commercial alloy was extruded at 633 K, and then heat treated at specific conditions. The microstructures were equi-axed grains, and average grain size and precipitate size were 11.6 μm and 50…
As new flame retardant (FR) approaches are developed they must be evaluated with conventional FR additives, processing additives, stabilizers, and fillers. In most cases this is done in a number of polymers, and a variety of processing conditions also must be optimized. Thus the development of new FR methods is a mult…
Corrosion inhibition of mild steel in 0.67 M H3PO4 by phenacyl dimethylsulfonium bromide and six of its p-substituted derivatives was studied using different chemical, electrochemical and scanning electron microscopy techniques. The order of increasing inhibition efficiency was correlated with its p-substituted throug…
Amorphous boron carbide coatings have been prepared by chemical vapor deposition from CH 4 /BCl 3 /H 2 precursor mixture at low temperature ͑800-1050°C͒ and reduced pressure ͑12 kPa͒.A kinetic study has been conducted to determine the kinetic law ͑including apparent activation energy and reaction orders͒ related to th…
We investigate a new generation of fullerene nano-oscillators: a single-walled carbon nanotube with one buckyball inside with an operating frequency in the tens-of-gigahertz range. A quantitative characterization of energy dissipation channels in the peapod pair has been performed via molecular dynamics simulation. Ed…
Viscosity, density thermal expansion, glass transition temperature, refractive index, molar refraction, and chemical durability of 15M 2 O.10CaO.xZrO 2 . (75-x)SiO 2 (M = Na for NCZ glasses, and M = K for KCZ glasses: x = 1, 3, 5, and 7) glasses were measured. The effect of SiO 2 /ZrO 2 equimolar substitution on measu…
Pure nickel carbide (Ni3C) nanoparticles with particle diameters of 40 nm have been prepared by thermal decomposition of nickel formate in the presence of oleic acid and oleyl amine. The coexistence of active nickel and active carbon plays an important role in the formation of metastable Ni3C. Ni3C powder decomposes a…
The newly synthesized boride Ti(1+x)Os(2-x)RuB(2) (x = 0.6) has a novel structure featuring one-dimensional chains of titanium atoms, one-dimensional strings of face-sharing empty tetrahedral and square pyramidal clusters and, most importantly, trigonal planar and strongly bonded B4 units with a B-B distance of 1.89 A.
Having a higher melting temperature than polyethylene, polypropylene has been expected to be an insulation material for power cables. But isotactic polypropylene (i-PP) used generally is unsuitable as cable insulation because it shows poor flexibility, low breakdown strength due to growing spherulites, and so on. But…
Benzoporphyrins fused with acenaphthylene or fluoranthene (3) and (4) were prepared by the condensation of bicyclo[2.2.2]octadiene(BCOD)-fused tripyrrane (5) with appropriate pyrrole dialdehydes ( 13) or ( 14) and the subsequent retro Diels-Alder reaction.The absorptions of these new porphyrins were very intense at bo…
In order to obtain cellular materials with low dielectric properties, crosslinked polyimide foams were prepared using 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 4,4′-oxydianiline (ODA) and 2,4,6-triaminopyrimidine (TAP) as monomer via a poly(ester-amine salt) precursor process. The structures of the pre…
It has been amply demonstrated that thin films of organofunctional silanes deposited by dipping or spraying on metals, such as aluminum, can provide protection against various forms of corrosion. In this paper we show that denser films with higher pore resistance and better corrosion protection performance can be obta…
A new methodology for the computation of the low-temperature part of phase diagrams without recourse to any experimental information is presented. A central element is a procedure for deciding whether formation of crystalline solid solution phases can take place in the chemical system. Via global exploration of the en…
The interaction between a chromia-forming alloy interconnect and ( La , Sr ) MnO 3 ∕ Y 2 O 3 – ZrO 2 (LSM/YSZ) and Gd-doped CeO 2 (GDC)-impregnated LSM electrodes is investigated under solid oxide fuel cell operating conditions. LSM/YSZ and GDC-impregnated LSM composite electrodes show much higher electrochemical acti…