Materials Literature
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We apply a density-functional formalism to a system of hard spherocylinders and obtain a phase diagram including the isotropic, nematic, and smectic-A phases. The nematic--smectic-A transition can be of either first or second order, and the tricritical point is located at a length-to-diameter ratio L/D=5.9. The coexis…
Based on thermodynamic predictions that, in the gas‐phase system AlCl 3 /NH 3 , AlN can be produced up to the theoretical yield, the performance of a chemical vapor deposition (CVD) reactor suitable for continuous powder production is investigated. Under the applied reaction conditions and reactor configuration, fine…
The antitumor activity and normal tissue toxicity of cis-diammine-1,1-cyclobutane dicarboxylate platinum (II) (carboplatin) in combination with whole body hyperthermia (WBH) (41.5 degrees C, 120 min.) were examined in an F344 rat model. Carboplatin data were compared with those of cis-diamminedichloroplatinum (II) (ci…
The conductivity of doped polypyrrole, as high as 100 Scm−1 in freshly prepared samples, falls slowly with time on exposure to atmospheric oxygen. Typically, the fall in conductivity is fairly slow at room temperature, but the process can be accelerated by heating samples and measuring the decrease in conductivity as…
Earlier magnetic resonance studies suggested no direct interaction between Mg2+ ions and adenylate kinase (AK) in the AK.MgATP (adenosine 5'-triphosphate) complex. However, recent NMR studies concluded that the carboxylate of aspartate 119 accepts a hydrogen bond from a water ligand of the bound Mg2+ ion in the muscle…
Abstract The stereoselective substitution of chlorine atoms was used to graft anthracene and phenyl groups onto the poly(vinyl chloride) (PVC) backbone as ultraviolet (UV) tracers for the assessment of the residence time distribution (R.T.D) of PVC chains during the extrusion of rigid and plasticized PVC. The residenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElementary surface reactions in the preparation of vanadium oxide overlayers on silica by chemical vapor depositionKei Inumaru, Toshio Okuhara, and Makoto MisonoCite this: J. Phys. Chem. 1991, 95, 12, 4826–4832Publication Date (Print):June 1, 1991Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of structure on phase behavior of polyamide blendsThomas S. EllisCite this: Macromolecules 1991, 24, 13, 3845–3852Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published inissue 1 June 1991https://doi.org/10.1021/ma00013a017Requ…
Laboratory-prepared samples of four types of epoxy coatings on 1010 (UNS(1) G10100) carbon steel were immersed in aerated ASTM(2) seawater for up to 4 years. Quantitative visual coating degradation via blistering was correlated to coating and corrosion parameters as determined by electrochemical impedance spectroscopy…
Abstract Pyrrole was found to polymerize electrochemically in a smooth and facile way when the immediate vincinity of the anode is at a pH of 3 ([H + ] = 10 −3 mol/dm 3 ). The polymerization is inhibited by the presence of a H + scavenger, di‐ tert ‐butylpyridine. Polymerization of pyrrole in a buffered solution of pH…
Treatment of Zr(NEt2)4 with the free-base porphyrins 5,10,15,20-ttraphenylporphyrin (H2TPP) or 2,3,7,8,12,13,17,18-octaethylporphyrin (H2OEP) gives the transition-metal bis(porphyrinato) complexes Zr(TPP)2 and Zr(OEP)2. The hafnium analogue Hf(OEP)2 may be prepared similarly from Hf(NEt2)4. The complexes have been cha…
Dimers with very different RuRu bond lengths and RuClRu bond angles—deformation isomers—are present in equal parts in crystals of the title compound. Solid-state NMR investigations show that the isomer 1 a with the shorter RuRu distance (2.93 Å) is diamagnetic, that with the longer distance (3.75 Å, 1 b), on the o…
Sessile drop studies of molten aluminum on single‐crystal sapphire substrates were conducted to investigate the effects of atmosphere on contact angle, substrate reactions, and interfacial crystal growth. Unlike previous investigations performed briefly in a vacuum environment in a temperature range within 600°C of th…
Abstract The microhardness ( H ) of poly(ethylene terephthalate) (PET) containing catalysts, as well as of PET without catalysts has been investigated. Two types of morphologies have been examined: (a) structures where spherulitic growth is incomplete, resulting from a primary crystallization from the glassy state and…
The occurrence of a reversible phase transformation from a rhombohedral crystalline structure to a perfect quasicrystalline state of chemical composition Al63·5Fe12·5Cu24 has been studied by transmission electron microscopy. Both direct in situ heating experiments and thermal treatments of bulk dodecahedral particles…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA spectroscopic study of phase-transition kinetics in syndiotactic polystyreneNicholas M. Reynolds, Howard D. Stidham, and Shaw Ling HsuCite this: Macromolecules 1991, 24, 12, 3662–3665Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publish…
We report a neutron diffraction study of the liquid structure of YCl 3 and combine the structural data with macroscopic melting and transport data to contrast the behaviour of this molten salt with those of SrCl 2 , ZnCl 2 and AlCl 3 as prototypes of different melting mechanisms for ionic materials. A novel melting me…
In Parts I and II, the structure of small-scale yielding fields of interface cracks were described in the context of small strain plasticity and J2 deformation theory. These fields are members of a family parameterized by the plastic phase angle ξ which also determines the shape or phase of the plastic zone. Through f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong ferromagnetism between copper(II) ions separated by 6.7 .ANG. in a new phthalato-bridged copper(II) binuclear complexSaleh K. Shakhatreh, Evangelos G. Bakalbassis, Irene Bruedgam, Hans Hartl, Jerzy Mrozinski, and Constantinos A. TsipisCite this: Inorg. Chem. 1991, 30,…
We have undertaken a new and more detailed Fourier‐transform infrared (FTIR) spectroscopic study of α ‐lactalbumin (in D 2 O solution) aimed at correlating its secondary structures to observed Amide I’ infrared bands. The spectra reported here were interpreted in light of the recently determined crystal structure of α…