Synthetic applications of flash vacuum pyrolysis
H. McNab, Contemp. Org. Synth., 1996, 3, 373 DOI: 10.1039/CO9960300373
Materials Literature
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Pyrophoric Nature of Iron Sulfides
Hydrogen sulfide, often present in crude oil tankers, can react with rust to form various sulfides including mackinawite (FeS), greigite (Fe 3 S 4 ), and pyrite (FeS 2 ). The tendency for these compounds to react with oxygen in air to form potentially explosive mixtures depends upon their morphology and the environmen…
Deoxygenation of Polynuclear Metal−Oxo Anions: Synthesis, Structure, and Reactivity of the Condensed Polyoxoanion [(C4H9)4N]4(NbW5O18)2O
The deoxygenation of the mixed-metal polyoxoanion [(C(4)H(9))(4)N](3)NbW(5)O(19) with benzoyl chloride in dichloromethane forms quantitatively the condensed polyoxanion [(C(4)H(9))(4)N](4)(NbW(5)O(18))(2)O, in which two polyoxoanion fragments are linked together by a Nb-O-Nb oxo bridge. The product is characterized by…
Synthesis of 5,10,15,20-tetra(ruthenocenyl)porphyrin and 5,10,15,20-tetra(ferrocenyl)porphyrin
Using the Lindsey method the title compounds were prepared from the corresponding metallocenecarbaldehydes and pyrrole in 56% and 40% yield respectively.
Solidification of peritectic alloys
The solidification of peritectic alloys is reviewed, including both nucleation and growth. The introduction defines various compositions associated with binary peritectic alloys, their ‘equilibrium’ solidification, multicomponent peritectic systems, and metastable phases in peritectic systems. Nucleation studies are r…
Electronic Band Structure and Madelung Potential Study of the Nickelates La 2 NiO 4 , La 3 Ni 2 O 7 , and La 4 Ni 3 O 10
Tight-binding electronic band structures and Madelung potentials were calculated for La(2)NiO(4), La(3)Ni(2)O(7), and La(4)Ni(3)O(10) to examine why a metal-to-metal transition occurs in the nickelate Ln(4)Ni(3)O(10) (Ln = La, Nd, Pr). La(4)Ni(3)O(10) and La(3)Ni(2)O(7) are each found to have two hidden one-dimensiona…
A new computer-aided method for the efficiency measurement of low-loss transformers and inductors under nonsinusoidal operation
The measurement of voltages, currents and losses of saturated magnetic devices under nonsinusoidal conditions is not well understood, because the principle of superposition does not apply. The complexity of the task is increased by the fact that internally generated harmonic currents can be compensated by externally a…
Autoxidation of Aviation Fuels in Heated Tubes: Surface Effects
Recently it has been reported that autoxidation of a Jet-A fuel which occurs during passage through heated stainless-steel tubing is accelerated by the tubing walls and that this effect is mitigated as the surface becomes fouled. To investigate the generality of this finding, we have studied the depletion of dissolved…
Anodic oxidation mechanism of a spiropyran
The modulation of chemical events using light is attractive for applications in many technologies including displays, information storage and sensors. Spiropyrans are the most well studied of the technologically relevant photochromic compounds. Their oxidation is important from at least two perspectives: oxidative fai…
Chemical and Size Characterization of Layered Lead Iodide Quantum Dots via Optical Spectroscopy and Atomic Force Microscopy
Lead iodide (PbI 2 ) clusters were synthesized from the chemical reaction of NaI (or KI) with Pb(NO 3 ) 2 in H 2 O, D 2 O, CH 3 OH, and C 3 H 7 OH solvents. The observation of absorption features between the 550 and 350 nm region obtained with an integrating sphere strongly suggests PbI 2 quantum dot formation in solu…
Ecophysiological responses to a subterranean habitat; a Bathyergid perspective.
Les mammiferes qui ont une existence strictement souterraine rencontrent des problemes physiologiques tres differents de ceux qui vivent sur le sol. L'habitat souterrain met effectivement a l'abri des stress d'un climat extreme et de la predation, mais il constitue aussi un environnement sombre et peu ventile. L'adopt…
Ferroelectric Liquid Crystals for Nonlinear Optics: Orientation of the Disperse Red 1 Chromophore along the Ferroelectric Liquid Crystal Polar Axis
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFerroelectric Liquid Crystals for Nonlinear Optics: Orientation of the Disperse Red 1 Chromophore along the Ferroelectric Liquid Crystal Polar Axis†David M. Walba, Daniel J. Dyer, Teresa Sierra, Peter L. Cobben, Renfan Shao, and Noel A. ClarkView Author Information Dep…
Design of Side Chain and Main Chain Liquid Crystalline Polymers Containing Supramolecular Quasi-Rigid-Rodlike Mesogens Obtained from Collapsed Main Chain Macrocyclics
The synthesis of the AB 2 mesogenic group 13-hydroxy-1-(4-hydroxyphenyl)-2-(4-hydroxy-4‘-biphenylyl)tridecane (TPT‘-OH, 11 ) and its use in the preparation of 1,12,33,44-tetraoxa-25-[(methacryloyloxy)undecanyl]-57-ethyl[12.0.2.12.0.2]paracyclophane ( 17 ), 1,12,33,44,65,76-hexaoxa-25-[(methacryoyloxy)undecanyl]-57,89-…
Key Dimensions of Women's Ready-to-Wear Apparel: Developing a Consumer Size-Labeling System
Key dimensions were selected for women's ready-to-wear garments to generate an anthropometric size-labeling system designating garment size with body measurements. Two different statistical analyses were used to select key dimensions: residual variance analysis and factor analysis. The results of the study show that (…
Linear and Semicyclic Amphiphilic Diblock Copolymers. 1. Synthesis and Structural Characterization of Cyclic Diblock Copolymers of Poly(hydroxyethyl vinyl ether) and Linear Polystyrene and Their Linear Homologues
We recently proposed a new method allowing the controlled synthesis of ring-shaped polymers with predictable molar masses and narrow molar mass distribution. The cyclization is based on a unimolecular “end-to-end” coupling reaction of an heterodifunctional linear polymer precursor. In this paper, this methodology is a…
Liquid−Liquid Extraction Using the Composition-Induced Phase Separation Process
This paper describes a new separation process of liquid−liquid extraction. It consists of first mixing the system to be extracted with a primary solvent, which is soluble with the native solvent, and subsequently adding a modifier, which is insoluble with either the native or the primary solvent. This process is simil…
Influence of Humidity on the Radiant, Convective and Contact Heat Transmission Through Protective Clothing Materials
The effect of moisture on the heat transmission through fourteen protective clothing assemblies has been analysed. The samples have been prepared in three different ways to simulate the accumulation of humidity either in the outer shell or in the inner layers. The behaviour of breathable water barriers has been invest…
Microstructure-property relationships in high chromium white iron alloys
High chromium white irons are ferrous based alloys containing 11–30 wt-% chromium and 1.8–3.6 wt-% carbon, with molybdenum, manganese, copper, and nickel sometimes added as additional alloying elements. The microstructure of these alloys typically consists of hard primary and/or eutectic carbides in a matrix of austen…
Hexagonal Columns of Poly(n-alkyl propiolate) Produced with Rhodium Complex Catalyst. X-ray Analysis and Oxygen Permeability
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHexagonal Columns of Poly(n-alkyl propiolate) Produced with Rhodium Complex Catalyst. X-ray Analysis and Oxygen PermeabilityM. Tabata, Y. Sadahiro, Y. Nozaki, Y. Inaba, and K. YokotaView Author Information Department of Molecular Chemistry, Graduate School of Engineering, Hokka…
Structure of Mo−Mg Binary Oxides in Oxidized/Reduced States Studied by X-ray Absorption Spectroscopy at the Mo K Edge and Mg K Edge
The local structure around Mo atoms in Mo−Mg binary oxides has been investigated by X-ray absorption spectroscopy at Mo and Mg K edges. XANES and EXAFS spectra show that the binary oxides have a tetrahedral MoO 4 unit in the samples with a Mo/(Mo + Mg) ratio of less than 0.5 and an octahedral MoO 6 unit in the samples…