Materials Literature
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A liquid extrusion method for determining pore volume distributions has been developed that is especially useful for, but not restricted to, characterizing fibrous materials. It involves gravimetric monitoring of liquid that drains from an initially saturated sample as incremental increases in pressure gradient are ap…
The optical transitions induced by doping poly(3-methylthiophene) or polythiophene with BF 4 − or ClO 4 − have been investigated by in-situ spectroscopy in an opto-electrochemical cell. From the number of doping-induced bands and concentration dependence we found evidence that polarons are the primary electronic excit…
Accepting the widely held view that all glass transitions have the same features, a particularly simple model of a liquid of long rod molecules is studied. It is shown that the equations of motion of such a system are remarkably simple and permit simple intuitive pictures of the glass transition to be translated into…
The nematic substance 5CB is known from N.M.R. studies to be slightly biaxial, not in the sense that any bulk property measured in a direction at right angles to the director is liable to vary with rotation about the director, but in the sense that there are biaxial terms in the ordering matrix that describes the alig…
The [MoO(bdt)2]–/[MoO(bdt)2]2–(H2bdt = benzene-1,2-dithiol) redox couple, in dimethylformamide solution, is a fully reversible process at E½=–350 mV vs. standard calomel electrode and each of these anions has been characterised by X-ray crystallography; the metal–ligand bond lengths of the former are slightly shorter…
Some biforked mesogens belonging to five series were prepared and studied. They exhibit an interesting polymorphism in which both columnar and lamellar mesomorphic orders coexist at different temperatures. The short chains lead to the classical nematic phase and/or the smectic C phase. The long ones give evidence of a…
The crystal structure of hollandite from Gowari Wadhona, India has been refined. Chemical formula determined by EPMA and moisture counter is (Ba0.75K0.38)1.13 (Mn7.85Fe0.15)8O16·0.41H2O. The structure is monoclinic, I2⁄m, and cell constants are a=10.006(3)Å, b=2.866(1)Å, c=9.746(2)Å, β=91.17(3)°. Each atom exists on a…
The cytoplasmic 5S ribosomal RNA (rRNA) sequences from seven red algae, a golden-yellow alga, a diatom and five brown algae have been determined. Using these sequences, phylogenic tree of these organisms have been constructed.Three types of algae, i.e., Rhodophyta (red algae), green algae (members of green plants), an…
This paper presents a study of corrosion and stress corrosion cracking (SCC) of Alloy 600. The primary purpose of this work is to relate the corrosion susceptibility of the alloy after various heat treatments to the microstructure produced by these heat treatments. Three commercial alloys and three laboratory alloys w…
The book offers a distillation of experience with materials selection and corrosion control methods in the process industries from specially selected experts in more than 57 specific subject areas. As a result, each paper endeavors not only to provide some theoretical background for a specific subject, but also to exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally depolymerizable polycarbonates. 2. Synthesis of novel linear tertiary copolycarbonates by phase-transfer catalysisF. M. Houlihan, F. Bouchard, J. M. J. Frechet, and C. G. WillsonCite this: Macromolecules 1986, 19, 1, 13–19Publication Date (Print):January 1, 1986Pub…
For the calculation of the aqueous solubility of organic compounds, we defined new fragment solubility constants (fs) which were empirically determined on the basis of compiled data from the literature. First, 6 fundamental fs values were determined from data on 46 liquid alliphatic hydrocarbons. THese fs values were…
Thrombospondin (TSP) is a trace protein in plasma but is released in high concentrations from alpha-granules of activated platelets during hemostasis. It binds to the platelet membrane and becomes incorporated into fibrin clots. A variety of approaches were taken to learn the effects of TSP on fibrin polymerization an…
Recent reports have claimed that the simple Rapini-Papoular form for the anchoring energy of nematic liquid crystals is not correct for large distortions. We show that, taking into account the dielectric energy associated with the flexoelectric effect, a reanalysis of the data is consistent with the Rapini-Papoular fo…
A simple two‐dimensional packing model, consisting of arrays of circular particles, was used to calculate the free energy changes associated with the filling of pores of different coordinations with liquid. The calculations were used to determine the equilibrium distributions of a liquid in different packing arrangeme…
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Recently the Py solvent scale has been introduced and a large body of data has been generated using fluorescence measurements. Numerous problems exist in the correct determination of these values, including instrumental and chemical artifacts. Among the instrumental problems associated with correct Py assignments are…
A model of irradiation embrittlement is described for predicting the 41-J Charpy V-notch temperature shifts (ΔT) as a function of metallurgical variables and neutron exposure conditions. This forecasting procedure combines semi-empirical physical models with statistical analyses of test and power reactor data, and cal…
The time dependence of the complex dielectric constant ε of ferroelectric ceramics is well known as aging which is ascribed by most authors to a modification of the 90°-domain walls. Measurement of aging of Fe-doped PZT ceramic (rhombohedral) and Cr-doped BT ceramic (tetragonal), show that aging in these ceramics can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActinide thermodynamic predictions. 3. Thermodynamics of compounds and aquo-ions of the 2+, 3+, and 4+ oxidation states and standard electrode potentials at 298.15 KSteven G. Bratsch and J. J. LagowskiCite this: J. Phys. Chem. 1986, 90, 2, 307–312Publication Date (Print):Jan…