Materials Literature
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Dimerization of free acid and ester forms of disulfonated deuteroporphyrin is investigated in aqueous solution by absorbance and fluorescence spectroscopies. The dimerization equilibrium constant increases with the extent of esterification. In phosphate buffer saline (pH 7.4, 20 degrees C), it ranges from 1.4 x 10(6)…
The feasibility of intelligent utilization of iron-aluminum scraps is explored in this work. Through adding aluminum which is contained in the scraps to cast iron, the changes in wear resistance, heat resistance and damping property of aluminum-alloyed cast irons were systematically investigated. Superior properties w…
En-coordinated lithium salts of binary or ternary hexachalcogenodistannates(IV), Li4Sn2E6 · 8en (E = S (1), Se (2), Te (3)), Li4Sn2S1.36Se4.64 · 8en (4), Li4Sn2Se2Te4 · 8en (5 a), Li4Sn2Se2Te4 · 9en (5 b), and Li4Sn2S2Te4 · 10en (6) (en = 1,2-diaminoethane) were synthesized by extraction of Li/Sn/E or Li/Sn/E/E′ phase…
Ti and Ti alloys have a series of outstanding properties,such as small densities,high specific strengths and rigidities,excel- lent corrosion-resisting and antifatigue properties,good high-temperature behaviors and wedding performances and so on,and have been extensively applied to military(aerospace,et al)and civil(a…
Constitutive properties of concrete under dynamic loading play an important role in the analysis of concrete structures subject to impact loading.There are many defects such as micro crack and micro void inside the concrete material.Damage softening has a great influence on the mechanic behavior of concrete under impa…
Fibernodes in flax, hemp and stinging nettle fibers were studied using light microscopy(1). The fibers were prepared both mechanically and chemically. The observations showed that flax, hemp and stinging nettle fibers carry numerous unevenly distributed disturbances that we name fibernodes, visible as single or double…
The comparison of degradation of modified poly(e-caprolactone) film in different environments is presented. Poly(e -caprolactone) was incubated in a natural environment - sea water (the Baltic Sea), in buffered salt solution, in liquid medium containing sea water with NaN3 and in compost with plant treatment activated…
The heat and flame resistance of the high performance fibers poly- p-phenylenediamine-terephthalamide (PPTA), co-poly( p-phenylene-3,4-oxidiphenylene-terephthalamide) (TECH) and Poly( p-phenylene-2,6-benzobisoxazole) (PBO) fibers is studied. It is shown that for an organic polymer PBO has exceptional heat and fire res…
In part I, we have shown experimentally that the large amount of work softening is due to decreasing activation enthalpy for plastic deformation with increasing plastic strain. Based on the Peierls mechanism of the dislocation glide, the plastic deformation process in a quasiperiodic lattice is modelled. In the model,…
From the viewpoint of "supramolecular chemistry", control of crystal and electronic structures of molecular conductors is described. We have developed a variety of cation and anion radical salts containing supramolecular assemblies. For the formation of the supramolecular structures, two types of supramolecular syntho…
A terbium m -methylbenzoate complex with 1,10-phenanthroline, [Tb( m -MBA) 3 phen]·H 2 O has been obtained from ethanol solution, where m -MBA= m -methylbenzoate and phen=1,10-phenanthroline, and its structure determined by X-ray diffraction methods. The unit cell contains binuclear molecules of the title compound. Ea…
Freeze-dried collagen scaffolds can be used for a variety of medical tissue engineering applications. The pore structure of the scaffolds might play a decisive role for the inoculation, growth and differentiation of the cells. For a controlled 3D-cell growth the pore structure needs to be homogeneous and the pore size…
The air penetration within a porous clothing system on a moving human is an important physical process that considerably affects the heat and moisture resistance of the textile material. This effect of the coupled convection heat and mass exchange within the clothing system is experimentally investigated and theoretic…
The effect of microstructure on the ferromagnetic shape memory effect in Fe–Pd alloys was examined focusing on the orientation distribution, the grain boundary character and the grain size. Fe-29.7–31.0 at.%Pd polycrystals composed of columnar or equiaxed grains were prepared and their magnetostriction was measured un…
High-pH stress corrosion cracking (SCC) failures of underground pipelines have occurred in a wide variety of soils, covering a range in color, texture, and pH. No single characteristic has been found to be common to all of the soil samples. Similarly, the compositions of the water extracts from the soils have not show…
Powder X-ray diffraction experiments of the antiferroelectric PbHfO 3 were performed between 8K and 525K using a conventional X-ray generator and a synchrotron radiation. Antiferroelectric superlattice reflections and reflections at R-point appeared below 435K on heating. Reflections associated with a large cell volum…
The dielectric properties of organic-porous silica films deteriorate after photoresist removal processing. plasma ashing has been commonly used to remove photoresist. Nevertheless, the plasma will destroy the functional groups and induce moisture uptake in porous silica films. In this study, trimethylchlorosilane (TMC…
Structural analysis of the solvated mixed-valence (MV) trinuclear iron carboxylate, [Fe3O(HCO2)6(γ-pic)3]·x(γ-pic), 1, (γ-pic = 4-methylpyridine; x ≈ 1.3), has been performed from X-ray diffraction data at four temperatures. Analysis of the X-ray diffraction and variable temperature Mössbauer data for 1 clearly shows…
At –25°C, the sequential block copolymerizations of 4-(tert-butyldimethylsilyloxy)styrene (TBDMSS) and 4-methylstyrene (4MS) were investigated by using a syndiospecific living polymerization catalyst system composed of (trimethyl)pentamethylcyclopentadienyltitanium (Cp*TiMe3), trioctylaluminum (AlOct3) and tris(pentaf…
The luminescent property of Eu 3 + in ( Sr 0.99 La 1.01 ) Zn 0.99 O 3.495 solid solution was systematically examined. ( Sr 0.99 La 1.01 ) Zn 0.99 O 3.495 was newly found in the Sr-La-Zn-O system. Under ultraviolet excitation, emission intensity increases with increasing Eu 3 + concentration to y = 0.7 in ( Sr 0.99 La…