Materials Literature
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ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTSequential Cationic and Anionic Polymerizations by Triflate Complexes of Bulky Titanium Bisphenolates: One-Pot Synthesis of Polyoxetane−Poly(ε-caprolactone) Block CopolymerDaisuke Takeuchi and Takuzo AidaView Author Information Departme…
The viscoelastic properties and stabilities of those properties of organic hybrids consisting of chlorinated polyethylene (CPE) and tetrakis[methylene-3-(3-5-di-tert-butyl-4-hydroxy phenyl)propionyloxy]methane (AO-60) and triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methyl phenyl)propionyloxy] (AO-70) were inves…
Abstract A series of smectites was investigated to reveal the thickness distribution of crystallites. The Fourier decomposition technique of Bertaut-Warren-Averbach (MudMaster program) was applied to XRD reflections of <0.2 μm, glycolated Na-clays. It was shown that the thickness distribution is lognormal and the m…
We have studied the c-axis and the in-plane infrared response of the anisotropic crystals of ${\mathrm{LaSrGaO}}_{4}$ and ${\mathrm{LaSrAlO}}_{4}.$ We identify both transverse and longitudinal phonons. The lattice bands show pronounced features of mode coupling, which we attribute to the random distribution of La and…
Abstract The impact strength of microcellular poly(vinyl chloride) (PVC) produced from an industrial formulation was investigated. The solid‐state process with carbon dioxide as the blowing agent was used to prepare the specimens. Processing conditions were explored to produce microcellular PVC with a relative density…
This paper addresses and answers "no" to the question of whether the literal molecular-dynamically-derived species velocities prevailing at a solid surface bounding a two-component fluid continuum undergoing molecular diffusion constitute the appropriate species-velocity boundary conditions to be imposed upon the flui…
Abstract The crystal structure of cronstedfite-1 T was refined in space group P 31 m , using two crystals: a triangular tabular crystal from Herja, Romania and a conical crystal from Lostwithiel, Cornwall, England. The Herja sample has the composition of (Fe 2+ 2.20 Fe 3+ 0.80 )(Si 1.20 Fe 3+ 0.78 Al 0.02 )O 5 (OH) 4…
The photochemical excitation of aqueous solutions of Ru(bpy) 3 2+ and phenol (PhOH) in the presence of air produces 1,4-benzoquinone (BQ) as the only organic product. In this study, we examined the *Ru(bpy) 3 2+ /PhOH/O 2 system in terms of the dependence of the quantum yield of BQ formation (Φ BQ ) as a function of […
The [Eu II (DTPA)(H 2 O)] 3 - complex (DTPA = diethylenetriamine pentaacetate) has been prepared by controlled potential coulometry from [Eu III (DTPA)(H 2 O)] 2 - . [Eu II (DTPA)(H 2 O)] 3 - is less stable toward oxidation than Eu 2+ (aq), as shown by its more negative redox potential ( E 1/2 = −1.34 V in comparison…
Extruded polyethylene is used as the bulk insulation for ac HV cables because of its high electric resistivity and breakdown strength. Although the material at present has limited use in dc power cables, it is used extensively in submarine optical communication cable systems. This paper reports on the study of the sho…
Benzophenone was the first organic molecular material to be identified as polymorphic. It is well known that benzophenone crystallizes in a stable orthorhombic alpha-form (m.p. 321 K) with space group P2(1)2(1)2(1) and a = 10.28, b = 12.12, c = 7.99 A, [Girdwood (1998). Ph.D. thesis. Strathclyde University, Glasgow, S…
Abstract Solubilities of blowing agents (HFC‐134a, HCFC‐142b, and HFC‐152a) in polystyrene (PS) were measured at temperatures from 348 to 473 K and pressures up to 3.2 MPa with a volumetric method. For all conditions, the solubility of the blowing agents in PS decreased with increasing temperature. At a given temperat…
In this report we have investigated the use of wide angle scattering data not only to resolve overall size and shape of protein molecules in solution, but also to resolve details of fine structure. Methods have been developed for calculating protein solution scattering profiles based on atomic coordinates over a wide…
The reduction of the operating temperature of planar solid oxide fuel cells (SOFCs) to an intermediate temperature regime of 650–800°C is an important objective in current development activities worldwide, in order to reduce production costs and improve long-term stability. In addition, existing conventional SOFC prod…
In recent computer simulations of a simple monatomic system interacting via the Dzugutov pair potential, freezing of the fluid into an equilibrium dodecagonal quasicrystal has been reported [M. Dzugutov, Phys. Rev. Lett. 70, 2924 (1993)]. Here, using a combination of molecular dynamics simulation and thermodynamic per…
We have performed a systematic analysis of the voltage and temperature dependence of the tunneling magnetoresistance (TMR) of grain boundaries (GB) in the manganites. We find a strong decrease of the TMR with increasing voltage and temperature. The decrease of the TMR with increasing voltage scales with an increase of…
Ti3SiC2 is a so-called not-so-brittle ceramic that combines the merits of both metals and ceramics. However, many previous works demonstrated that its bonding nature and properties were strongly related to TiC. In this paper the crystallographic relations between Ti3SiC2 and TiC were established and described based on…
Morphological effects on molecular mobility have been studied for solid ultrahigh molecular weight polyethylenes (UHMW-PE) crystallized from the melt and from solution or during polymerization. On the basis of transmission electron microscopic (TEM) observation, a crystalline domain structure was well identified for n…
Light-induced excited spin state trapping of Fe(phen) 2 (NCS) 2 is studied by X-ray absorption spectroscopy using synchrotron radiation. The molecular structure of the excited high-spin state at 17 K is investigated by EXAFS. The relaxation of the light-induced high-spin state at various temperatures is monitored thro…
A procedure is described for estimating the background outline in powder diffraction patterns. It essentially consists of an extension of traditional smoothing procedures to include Bragg peaks in addition to profile random fluctuations. This approach is particularly suited for dealing with diffraction patterns obtain…