Materials Literature
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Abstract: In order to study Al-Fe substitution, Fe-kaolinites were synthesized at 200°C from glasses (Si/(Al + Fe) = 1) with varying Fe content. XRD and IR spectroscopy showed that kaolinites with increasing Fe contents could be synthesized, and Mössbauer spectroscopy indicated that the iron is strictly ferric. Chemic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShape-selective olefin epoxidation catalyzed by manganese picnic basket porphyrinsJames P. Collman, Xumu Zhang, Robert T. Hembre, and John I. BraumanCite this: J. Am. Chem. Soc. 1990, 112, 13, 5356–5357Publication Date (Print):June 1, 1990Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural sensitivity of the standard platinum/silica catalyst EuroPt-1 to hydrogen and oxygen exposure by in situ x-ray diffractionV. Gnutzmann and W. VogelCite this: J. Phys. Chem. 1990, 94, 12, 4991–4997Publication Date (Print):June 1, 1990Publication History Published o…
The stress corrosion cracking of a pipeline steel exposed to a carbonate-bicarbonate solution has been studied under various loading conditions, particularly those involving a relatively small component of fluctuating stress applied for various times. It is shown that the coalescence of stress corrosion cracks plays a…
Abstract Poly(ethylene 2,6, naphthalene dicarboxilate), PEN, is very similar to poly(ethylene terephthalate), PET, in its chemical structure and was, therefore, expected to exhibit similar processing characteristics. We, however, observed a few problems during stretching of PEN, the most important of which was necking…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical investigations of electronically conductive polymers. 4. Controlling the supermolecular structure allows charge transport rates to be enhancedLeon S. Van Dyke and Charles R. MartinCite this: Langmuir 1990, 6, 6, 1118–1123Publication Date (Print):June 1, 1990P…
Normal RAS proteins play a key role of molecular switch in the transduction of the growth signal from extracellular to intracellular space. The state of the switch is "on" when GTP is bound and "off" when GDP is bound to the protein. The crystal structure of a complex between a nonhydrolyzable GTP analog and the catal…
Chemical coprecipitation was used to produce ultrafine and easily sinterable MgO‐stabilized and (MgO, Y 2 O 3 ) stabilized ZrO 2 powders. The sintering behavior is very sensitive to post‐precipitation washing because “hard” agglomerates form when the precipitated gels are washed with water, whereas “soft” agglomerates…
Densifying silicon nitride with a YSiAlON glass additive produced 99% dense materials by pressureless sintering. Subsequent heat‐treating led to nearly complete crystallization of the amorphous intergranular phase. Transmission electron microscopy revealed that for heat treatments at 1350°C, only β‐Y 2 Si 2 O 7 was cr…
Abstract In theories of the minor phase (domain) formation in polyblends rendered as emulsions it is usually assumed that the size and shape of the domains are the result of melt viscosity effects (Taylor, Wu) or viscoelasticity effects (VanOene, Elmendorp) being balanced by interfacial tension. This assumption would…
The mechanical properties of a series of six fiber‐reinforced ceramics and glasses have been evaluated with the objective of critically assessing present understanding. A major parallel theme has been the characterization of the interface and an assessment of the thermomechanical properties of the interfaces as they r…
The relationship between the microscopic structure morphology and the electrical strength of polypropylene (PP) film used in PP-laminated paper (PPLP) in very high voltage oil-filled cable is studied by several methods including infrared spectrum, X-ray diffraction and dynamic mechanical spectra. It is found that the…
Infrared and Raman spectra of several examples of each of three classes of cyclic imides have been examined. Spectra-structure correlations have been sought for each of the classes, with particular emphasis being placed on the 1600–1800 cm −1 region. The spectra in this region are often complex, reflecting subtle stru…
Abstract Powdered 2:1 Mg-clay samples were rehydrated up to the maximum hydration. Both scanning and transmission electron microscopy were used to characterize their structural organization i.e. particle arrangement, texture and crystal structure. Low-angle X-ray scattering experiments were carried out to quantify the…
An introductory review of the cholesteric blue phases is presented. The emphasis is on the basic concepts of the theoretical framework and the recent achievements of theory and experiment. The author discusses a number of controversial issues indicating where future research is expected to shed light on the remaining…
A quasi-bookshelf layer structure has been obtained by a conventional rubbing method at room temperature in a FLC mixture composed of naphthalene-derived liquid crystals. This layer structure is spontaneously formed due to a unique temperature dependence of the interlayer spacing; X-ray diffraction indicates that the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal behavior of a rhodium/alumina model catalyst: disappearance of surface rhodium upon heatingJingguang G. Chen, M. Luigi. Colaianni, Peijun. Chen, John T. Yates, and Galen B. FisherCite this: J. Phys. Chem. 1990, 94, 12, 5059–5062Publication Date (Print):June 1, 1990Pu…
ABSTRACT. Understanding the tactile feel of paper, nonwoven, and woven products requires a valid and reliable sensory evaluation method which discriminates and describes handfeel properties. The Handfeel Spectrum Descriptive Analysis method separates the sensory tactile properties of paper and fabrics into clearly def…
We present a density-functional theory, based on the smoothed density approximation, to study systems of hard rods with full translational and orientational freedom. For hard spherocylinders, we find both the nematic-isotropic and the nematic--smectic-A transition in a wide range of length-to-width ratios (L+D)/D. We…
Abstract The grafting of polyesters onto ultrafine inorganic particles, such as silica, titanium oxide, and ferrite, by use of potassium carboxylate (COOK) groups introduced onto the surface was investigated. The introduction of COOK groups onto the surface was achieved by the neutralization of acid anhydride groups,…