Materials Literature
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Abstract Clay minerals from the MacAdams Sandstone, Kettleman North Dome, California, have been studied by electron microscopy. The clay minerals fill pore space associated with fractured and brecciated clasts of K-feldspar. Curved packets of muscovite and kaolinite are caused by deformation of detrital muscovite that…
The effect of added non-adsorbing polymer on the isotropic-nematic phase transition in a model lyotropic liquid crystal - a suspension of hard rods - is studied theoretically. The results indicate that the transition is widened and that polymer is partitioned preferentially into the more dilute isotropic phase. The co…
The phase diagram of binary system of 4-n-pentyl 4′cyanobiphenyl (component 1) and 4-n pentylphenyl 4-n′hexyloxy benzoate (component 2) is presented, which shows the presence of an injected smetic phase. Refractive indices and densities for ten different compositions of this mixture and for one pure component are meas…
Abstract The temperature dependence of ionic mobility for a silver ion conducting borate glass with composition 55.5 AgI22.25 Ag 2 O22.25 B 2 O 3 (in mol%) is reported along with conductivity. Subsequently the value of mobile carriers n is calculated. The value of n is found to decrease with increase in temperature.…
We consider a nematic slab with homeotropic anchoring and investigate the effect of a magnetic field, H, parallel to the plates and an electric field, E, perpendicular to them $(\epsilon_{\rm a} < 0,~\chi_{\rm a} > 0)$. The magnetic field is either fixed, or rotating at a frequency ω around an axis perpendicular to th…
We calculate the coercive field of thin ferroelectric films caused by the domain wall pinning by surface inhomogeneities. The Joanny-De Gennes formula is generalized to the elastic energy of the line of intersection of the domain wall with the surface of ferroelectrics. The coercive field induced by the pinning is sho…
Abstract Photoinduced electron transfer (ET) between zinc myoglobin (ZnPPMb) and a variety of quenchers, such as hexacyanoferrate(III) ([Fe(CN)6]3−) and hexaammineruthenium(III) ([Ru(NH3)6]3+) ions, cationic viologens, copper(II) protein (stellacyanin), and metmyoglobins, has been studied in aqueous degassed solutions…
Saccharomyces cerevisiae myristoyl-CoA:protein N-myristoyltransferase (Nmt1p) is a monomeric enzyme that is essential for vegetative growth. Nmt1p catalyzes the co-translational transfer of myristate from CoA to the amino-terminal Gly of cellular proteins in an ordered Bi Bi reaction mechanism that initially involves…
Abstract Photo-induced structural changes were observed for an aggregate composed of amphiphilic sequential polypeptides with an azobenzene moiety in the main chain. The polypeptides associated with each other and formed micelle in aqueous solution in the dark. Photo-isomerization of the azobenzene moiety of the polyp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of an osmium porphyrinato bis(arylimido) complex, Os(TTP)(NAr)2, with strongly bent osmium-organoimido bondsJoanne A. Smieja, Kristin M. Omberg, and Gary L. BrenemanCite this: Inorg. Chem. 1994, 33, 3, 614–616Publication Date (Print):February 1…
Effects of shot peening on the corrosion and stress corrosion cracking (SCC) behaviors of sensitized alloy 600 (UNS N06600) were studied. Electrochemical potentiokinetic reactivation (EPR) tests in 0.01 M sulfuric acid (H2SO4) + 0.001 M potassium thiocyanate (KSCN) solution and immersion tests in boiling 25% nitric ac…
Recent observations have suggested a revision of the prevailing view that monodisperse foams are generally disordered. Among the ordered structures which are possible, b.c.c. (the Kelvin structure) should prevail at low liquid fractions, and f.c.c. (or other close-packed structure) at high liquid fractions. The instab…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence isomers of benzene and their relationship to the isoelectronic isomers of arsenic molecule (As6)D. Scott Warren, Benjamin M. Gimarc, and Ming ZhaoCite this: Inorg. Chem. 1994, 33, 4, 710–715Publication Date (Print):February 1, 1994Publication History Published online…
The polarized optical absorption spectra of ${\mathrm{Cr}}^{3+}$ ions have been systematically investigated in two acentric crystals with Ca-gallogermanate structure: ${\mathrm{La}}_{3}$${\mathrm{Ga}}_{5.5}$${\mathrm{Nb}}_{0.5}$${\mathrm{O}}_{14}$ and ${\mathrm{La}}_{3}$${\mathrm{Ga}}_{5.5}$${\mathrm{Ta}}_{0.5}$${\mat…
Abstract Monolayer to bilayer (MTB) and bilayer to pseudotrimolecular (BTP) transitions were observed for smectites exchanged with symmetrical tetraalkylammonium cations of increasing sizes: + NR 4 , where R = (CH 2 ) n CH 3 , with 0 ≤ n ≤ 7. In the case of SWy-1, SHCa-1 and SWa-1, the variation in layer spacing obser…
The kinetics of isobutylene (IB) polymerization, initiated by 2-chloro-2,4,4-trimethylpentane (TMPCI)/TiCI4 initiator/coinitiator system in methyl chloride/methyl/cyclohexane solvent mixture at −90°C, was investigated. The existence of a dynamic equilibrium between dormant and active species was verified by obtaining…
Article FT-IR Spectroscopic Study of NH3 and CO Adsorption and Coadsorption on TiO2 (Anatase) was published on February 1, 1994 in the journal Zeitschrift für Physikalische Chemie (volume 187, issue 2).
The preparation and characterization of supported bimetallic clusters has been an active area of research following the initial pioneering efforts of Sinfelt in the late 1960s and early 1970s [1–3]. Because of the importance of supported bimetallic and multimetallic catalysts in industrial applications such as petrole…
The attenuated total reflection (ATR) method in a prism/gap/metal configuration was used in Raman spectroscopy of molecules adsorbed on silver to improve the detection limit. The thickness of the air gap was controlled between Λ L /2 and 2Λ L (Λ L : wavelength of the incident light) with a biaxial suspension. All the…
Abstract The intramolecular magnetic interactions between 1/2 spins of two oxovanadium(IV) ions were studied in the complexes L[VO(hfac)2]2 (hfac = hexafluoroacetylacetonate, L = 4-methyl-, 4,6-dimethyl-, 4-amino- and unsubstitute-pyrimidines, and quinazoline). The magnetic measurements revealed that the vanadium spin…