Materials Literature
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Singlet excited-state properties of mono- and di-thiaporphyrins and their dications are reported. A comparison of vibrational frequencies of the ring stretching modes of neutral and protonated species in resonance Raman spectra show shifts to both higher and lower frequencies. An analysis of the shifts of various Rama…
The authors present a review of their research work in an endeavor to interpret the behavior of zinc-rich paints (ZRP) using electrochemical impedance spectroscopy (EIS). This technique can provide much useful information about the protection mechanisms of ZRP. The tendency of some of these coatings to act like an ele…
After a brief review of the experimental data concerning phase transitions in ferroelectric thin films, a theoretical treatment based on the Landau-Devonshire expansion is presented. A surface is characterised by a length δ, the negative of the logarithmic derivative of the order parameter at the surface. For negative…
The mechanism of the ω→α phase transformation following isothermal aging has been studied on a single crystal of a Ti-14 mass%Mo alloy. For isothermal aging at 623 K, the specimen showed a maximum hardness at 1×106 s and subsequent softening. At 3×105 s to 1×106 s the ω particle abruptly grew so far as about 100 nm by…
Abstract The electrochemical behaviour, FTIR spectrum and the morphology of polypyrrole‐polystyrenesulphonate (PPy‐PSS) films obtained potentiostatically at 0.6 V in a 0.05m Py + 1.7 × 10 −2 m NaPSS medium have been analysed. Different electrochemical parameters have been modified in order to establish the first polar…
This paper describes the results of accelerated particulate fouling tests performed on different enhanced tubes and a plain tube. The key purpose of the tests was to investigate particulate fouling in practical heat exchanger systems where a mixture of particles exists in a flowing water stream. The applications consi…
The new lanthanide–hydrogen–transition metal compounds [{[PMe3)3WH5}2Yb·L3] and [{(η-C5H5)2NbH2}2Yb·L3], where L3=(MeOCH2CH2)2O, are prepared and their crystal structures determined.
Several clean agricultural screens were tested to determine force and static pressure drop across the screen created by airflow through the screen. Wind pressures on screens and static pressure drop across screens increased exponentially with increases in apparent air velocity. Fabric density, configuration, and dimen…
The hydrolytic behaviour of iron(III) has been investigated. The infrared spectrum of the sulfate salt of a hydrolysed iron(III) solution was found to match that of a gallium sulfate that had been shown through magic angle spinning NMR spectroscopy in combination with powder X-ray diffraction studies to contain the Ga…
Water vapour was used as a diffusional probe to study segmental mobility in hydrogen-bonded polymer blends. Modified polystyrenes containing 4-hydroxystyrene as comonomer units were blended with poly(methyl methacrylate). The diffusion coefficient of water decreased with increasing concentration of the diffusant. Clus…
A new direct-methods procedure has been devised which consists of phase refinement via the minimal function, R(phi), alternated with Fourier summation and real space filtering. All phases are initially assigned values by computing structure factors for a randomly positioned set of atoms. These phases are then refined…
Currently, there are a large variety of degradable polymers available for use in surgery, which are generally based on blends and copolymers of poly(L-lactide) (PLLA) and poly(L-glycolide) (PGA). The major demand for these materials is for suturing of wounds, but the materials are also being developed for use in ortho…
The (R4N)2[Ni(tdas)2] complexes (tdas2–= 1,2,5-thiadiazole-3,4-dithiolate and R = Bu, Et) are prepared and characterized by X-ray crystallography, which reveals differences in their structure dependant on the size of the R4N cation.
Partial discharge measurement is an important means of assessing the condition and integrity of insulation systems in high voltage power apparatus. Commercially available partial discharge detectors display them as patterns by an elliptic time base. Over the years, experts have been interpreting and recognising the na…
The synthesis and characterization of side-chain liquid-crystalline polysiloxanes based on 4′-cyanobiphenyl-4-yl 2-(2-allyloxyethoxy)-4-(4-methoxybenzyloxy)benzoate (11-1), 4′-cyanobiphenyl-4-yl 2-[2-(2-allyloxyethoxy) ethoxy]-4-(4-methoxybenzyloxy) benzoate (11-2) and 4′-cyanobiphenyl-4-yl 2-{2-[2-(2-allyloxyethoxy)e…
The effect of additives on carbothermal reduction-nitridation was investigated for the preparation of AlN powders from the Al2O3-C-N2 system. According to the role of additives in nitridation, they were divided into three categories: “promote”, “have no effect” and “disturb”. In particular, CaF2 was an excellent nitri…
The reaction of the hydrated β-diketonate complexes [Ln(tmhd)3(H2O)] with triglyme (2,5,8,11-tetraoxadodecane, L1) in hexane yielded the eight-coordinate triglyme-bridged dimeric complexes, [{Ln(tmhd)3}2L1](Ln = Eu 1 or Tb 2; tmhd = ButCOCHCOBut). In contrast, the reaction of [La(tmhd)3(H2O)] with tetraglyme, (2,5,8,1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer brush in contact with a mixture of solventsJ. F. MarkoCite this: Macromolecules 1993, 26, 2, 313–319Publication Date (Print):January 1, 1993Publication History Published online1 May 2002Published inissue 1 January 1993https://pubs.acs.org/doi/10.1021/ma00054a010https…
All articles of this category Syntheses of two novel classes of water soluble phthalocyanines substituted with propionic acid or O-ethyl, methyl-phosphonic acid groups are described. These compounds have applications in the field of photodynamic inactivation of cancer cells and viruses.
The synthesis and characterization of cyclic main chain liquid-crystalline oligomers based on 1-(4-hydroxy-4′-biphenyl)-2-(4-hydroxyphenyl)butane (TPB) with 1,7-dibromoheptane (TPB-7(c)] are described. These oligomers were synthesized by the phase transfer catalysed polyetherification of TPB with 1,7-dibromoheptane un…