Materials Literature
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Abstract This article deals with the microlevel structure of the electronically conductive polymer, polyaniline, on the basis of the conducting islands model of Epstein et al. The paper presents, for the first time, TEM pictures of the microlevel structure of heavily doped polyaniline, possibly showing the conducting…
Ferricytochromes c were crystallized at low ionic strength by macroseeding techniques. Large crystals were grown by seed-induced self-nucleation which occurred anywhere in the drop, regardless of the location of the seed crystal. This unusual crystal-seeding method worked reproducibly in our hands, and X-ray quality c…
Abstract The interrelationship between the cross‐linking and isoimide‐imide isomerization reactions of oligomeric isoimides and imides was investigated using FTIR spectroscopy. It was found that cross‐linking of the acetylene units of Thermid IP‐600 retarded the local rearrangement of the isoimide to imide conversion…
The effect of hydrostatic pressure on the structural phase transitions has been studied for the tetraethylammonium tetrahalogenometallic compounds, {N(C2H5)4}2-XY4 (XY4 = ZnCl4, ZnBr4, CoCl4, CoBr4, MnBr4, and CuBr4) by dielectric measurements. The transition temperatures increase linearly with increasing pressure. Th…
X-ray scattering measurements have been carried out for free-standing, thick monodomain films of the orthogonal hexatic-B phase. From Fourier analysis of χ-scans, 6 n -fold-symmetry order parameters were determined and proved to fulfill the scaling relation C 6 n = C 6 n +λ n ( n -1) . The temperature behavior of C 6…
Blends of uncrosslinked styrene-butadiene rubber (SBR) with a terpene tackifier resin or a naphthenic oil have been characterized, and their autohesion and cohesion determined using a T-peel geometry. SBR/oil blends are homogeneous at all proportions, while SBR/resin blends, based on DSC and DMA analysis, undergo bulk…
Abstract Approaches to plastics recycling mainly include direct recovery keeping the polymer structure intact, depolymerization and then reuse of monomers, and methods involving reduction of polymer to gases and low molecular weight oils. The model process presented here belongs to the first category: It is proposed d…
Résumé: Nous analysons la déformation de cisaillement pour différentes vitesses de chargement dans le domaine des grandes et très grandes vitesses de déformation. Ainsi, nous présentons brièvement les différentes techniques expérimentales utilisées dans ce domaine. Une nouvelle technique expérimentale basée sur l&…
There is an increasing challenge for chemical industry and research institutions to find cost-efficient and environmentally sound methods of converting natural resources into fuels chemicals and energy. Catalysts are essential to these processes and the Catalysis Specialist Periodical Report series serves to highlight…
The transition behaviour of deformation mode from particle shearing to looping has been investigated in the Al-Li alloy single crystals using optical microscopy, transmission electron microscopy and mechanical testing. The observation of slip-line morphology and of dislocation structures indicated the occurrence of a…
The detection of atomic‐size defects by atomic force microscopy (AFM) is demonstrated. For example, the dark grooves in the image of the surface of the incommensurate layered telluride phase TaGe 0.355 Te 2 (see Figure) indicate a defect. The origin of this incommensurate structure of layered tellurides is established…
The charging of an insulator surface when irradiated with a stationary low-energy electron probe is simulated by Monte Carlo techniques. Results show that the irradiated core initially charges positively, causing a potential barrier to form, thereby attracting lower energy secondary electrons back towards the surface.…
Abstract A comparison of the magnitudes of yarn-to-yarn and fabric-to-fabric friction is made. It is shown that yarn friction measured on a capstan (cylindrical) surface is significantly greater than that measured on a flat surface. The greater magnitude of the coefficient of friction in a capstan assembly is ascribed…
Abstract The sorption of ethyl acetate and limonene as individual sorbates and in binary vapour mixtures by an oriented polypropylene was determined by two independent methods, namely by gravimetric and thermal stripping/thermal desorption procedures. The two methods showed excellent agreement. The solubility coeffici…
The modelling methods developed so far for grain-oriented electrical steels can not account for the true properties of materials. When these models were developed, more consideration was given to obtain fast convergence speed for numerical iterations than the accuracy of models themselves. For magnetic materials, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of K-Doped Molybdena-on-Alumina Catalysts As Studied by X-ray Absorption and Raman SpectroscopyN. F. D. Verbruggen, G. Mestl, L. M. J. von Hippel, B. Lengeler, and H. KnoezingerCite this: Langmuir 1994, 10, 9, 3063–3072Publication Date (Print):September 1, 1994Publ…
The present study takes advantage of the ability of Fourier Transform Infrared Spectroscopy (FTIR) for the analysis of ultrathin organic films on metals. FTIR in the reflection mode (IRRAS) is used in order to study the interaction of ultrathin films of dicyandiamide (hardener of most one-pack epoxy resins) with vario…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Structure and Stability of closo-Heteroboranes, XYBnHn (n = 3-5; X, Y = N, CH, P, and SiH). An ab Initio MO StudyEluvathingal D. Jemmis and G. SubramanianCite this: J. Phys. Chem. 1994, 98, 37, 9222–9226Publication Date (Print):September 1, 1994Publication History…
A computational method was used to calculate the distance-dependent adsorption energies of three proteins, immunoglobulin Fab, trypsin, and lysozyme, on polyethylene, polypropylene, and poly(vinyl alcohol) surfaces. Two different protein orientations for each protein were used to calculate the interaction energy as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic Tantalum(V) Bis(dicarbollide) Complexes with Bent-Metallocene StructuresRoger Uhrhammer, Yue-Xin Su, Dale C. Swenson, and Richard F. JordanCite this: Inorg. Chem. 1994, 33, 19, 4398–4402Publication Date (Print):September 1, 1994Publication History Published online1 M…