Materials Literature
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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,…
The novel organic ion-complex crystal composed of protonated merocyanine and p-toluenesulfonate anion, i.e., 1-methyl-4-(2-(4-hydroxyphenyl)vinyl)pyridinium 4-toluenesulfonate (MC-PTS), was synthesized for second-order nonlinear optics. Crystal structure analysis revealed that MC-PTS crystallized in the space group of…
The biocompatibility of a subcutaneously implanted bovine collagen sponge (Haemostagen) was studied in rats by analyzing tissue reactions up to 3 months by histological and ultrastructural methods; in addition, the level of serum antibodies to bovine type I collagen (the major implant collagen) was measured by solid-p…
Abstract A new type of twin liquid crystalline complex having two terminal mesogenic units and a central flexible spacer has been formed through intermolecular hydrogen bonds between a nonmesogenic aliphatic diacid and mesogenic stilbazoles.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical effects of continuous and pulsed ultrasound: a comparative study of polymer degradation and iodide oxidationArnim. Henglein and Maritza. GutierrezCite this: J. Phys. Chem. 1990, 94, 12, 5169–5172Publication Date (Print):June 1, 1990Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of the ring-opening polymerization of (S)-.beta.-butyrolactoneYan Zhang, Richard A. Gross, and Robert W. LenzCite this: Macromolecules 1990, 23, 13, 3206–3212Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue…
Radiocopper-labeled pyruvaldehyde bis(N4-methylthiosemicarbazonato)copper(II), Cu[PTSM], is under investigation as a radiopharmaceutical for evaluation of regional blood flow in the brain, heart, and kidneys because it affords relatively high levels of radioactivity in these organs upon intravenous injection, followed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolydispersity effects on the microphase-separation transition in block copolymersC. Burger, W. Ruland, and A. N. SemenovCite this: Macromolecules 1990, 23, 13, 3339–3346Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 Ju…
In 1974, Halperin, Lubensky, and Ma (HLM) [Phys. Rev. Lett. 32, 292 (1974)] predicted that the nematic--smectic-A transition of pure compounds and their mixtures should be at least weakly first order. One way to obtain such a prediction is to treat the smectic order parameter as a constant and integrate out the direct…