Materials Literature
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To render impossible the penetration of interference (disturbing) energy of electromagnetic radiation to sensitive electronic devices, or to protect people against its effects, there is a need of shielding in many areas. The importance of this problem has resulted in a growing number of research works on the optimisat…
A virtual atom cluster (VAC) model that represents the effect of interatomic bonding is developed as the constitutive model for crystal systems. In contrast with the crystal elasticity model, the proposed VAC model is distinguished by the following features: i) It does not build any constitutive relations that involve…
Five representative lanthanide coordination compounds with a disulfoxide ligand [L = 1,4-bis(phenylsulfinyl)butane], [Ln(L)4](ClO4)3 (Ln = La, 1; Eu, 2; Gd, 3; Tb, 4; Yb, 5), have been synthesized and structurally characterized by single-crystal X-ray diffraction. These compounds have isostructural mononuclear structu…
Galvanostatic anodization of aluminum at high current densities (100, 150, 200 mA cm −2 ) was studied. The growth rates of the synthesized anodic aluminum films were 1-3 μm/min. Films with ordered pores or with a fractal surface were also prepared. Consequently, nonlinear anodization and hypothesis for film formation…
The condensation copolymerization of a variety of linker molecules with polyethylene glycols (PEGs) of varying molecular weights, catalyzed by lipases under solvent-less conditions is reported. Previously, we reported the lipase-catalyzed condensation polymerization of dimethyl 5-hydroxyisophthalate with polyethylene…
A mean of one biotinylated dextran molecule per particle is conjugated to 15 nm gold nanoparticles, by a process of self-assembly, which depends on the relationship between dextran molecular weight and particle size.
Abstract The reaction of HgCl 2 with PPh n Pr 2 , Te(Si n Bu 3 ) 2 and PhESiMe 3 (E = Se, Te) in DME at −30 °C results in the formation of yellow octahedral crystals of [Hg 10 Te 4 (SePh) 12 (PPh n Pr 2 ) 4 ] and [Hg 10 Te 4 (TePh) 12 (PPh n Pr 2 ) 4 ] respectively. The molecular structures of the clusters are similar…
The presence of a six-membered chelate ring involving a pyridine N-oxide moiety induces exclusive M isomer formation throughout the whole lanthanide series endowed with a fast water exchange in the case of the Gd(III) complex.
A water-in-water mesophase that contains only hydrophilic domains is reported for the first time; the mesophase templates highly porous calcium phosphate.
Bent- and straight-rod shaped liquid crystalline amides 1–3 were designed and synthesized, and their thermodynamic behaviors were investigated by polarized optical microscopy and differential scanning calorimetry, and their layer distances were measured by X-ray diffraction. Weak or strong hydrogen bonds were observed…
The reaction of [(THF)Li(Ph(2)PC(H)Py)] with ZnCl(2) in the presence of ZnO yields the zinc complex [Zn(3)(Ph(2)PC(H)Py)(4)O] (1). Deprotonation of the phosphane Ph(2)P(CH(2)Py) with [Fe(N(SiMe(3))(2))2] gives the iron complexes [(Ph(2)P(CH(2)Py))Fe(Ph(2)PC(H)Py)2] (2) and [Fe(Ph(2)PC(H)Py)(N(SiMe(3))(2))]2 (3), depen…
Los ostracodos estan en general fuertemente calcificados y su concha esta basicamente compuesta por calcita. Investigaciones realizadas sobre el caparazon revelan una estructura cristalina que difiere de la estructura de la calcita quimicamente precipitada. El calcio de la capa epidermica presenta una concentracion de…
Doubly N-fused hexaphyrins were synthesized from meso-aryl substituted hexaphyrins and X-ray crystallography revealed that syn- or anti-double N-fusion occurred, depending on the positions of meso-substituents.
Crystallisation of calcium carbonate in the presence of the polycarboxylate 1,3-diamino-2-hydroxypropane-N,N,N',N'-tetraacetate results in the formation of "microtrumpets" composed of nanocrystalline calcite.
Polynuclear manganese(II), cobalt(II)/(III), iron(II)/(III) and nickel(II) complexes of a group of flexible polydentate dihydrazone ligands, based on pyridine-2,6-dipicolinic (A), oxalic (B) and malonic (C) subunits are described. Structural details are reported for the linear dinuclear complexes [Ni2(2poap)2(H2O)2](N…
Flow modulation chemical vapor deposition (FMCVD) with titanium tetrachloride (TiCl4) and ammonia (NH3) is effective for depositing titanium nitride (TiN) films with conformal morphology, good step coverage, low electrical resistivity, and low chlorine residual contamination. It means that FMCVD TiN film is a good can…
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The electrochemical insertion/extraction of calcium ions into/from crystalline vanadium oxide ( c V 2 O 5 ) was investigated by galvanostatic measurements. Electrochemical cells using c V 2 O 5 as a cathode active material provided a discharge capacity of more than 450 mAh g − 1 at a current density of 50 μ A cm −…
Creep deformation behavior of coarse-grained Mg-Al based solid solution alloy (AZ31) was studied in a wide strain rate range of 2 × 10−5∼7 × 10−2 s−1 at temperature range of 573∼673 K. Viscous glide controlled creep (VGC), dislocation climb creep (DCC) and power law breakdown (PLB) showed up in order with increasing s…
ABSTRACT The ferrite phase of cast duplex stainless steels becomes embrittled after thermal ageing, leading to a significant decrease in fracture properties. In the present paper, the influence of ageing and solidification structure on the fatigue crack growth rates (FCGRs) and on the fatigue crack growth mechanisms i…