Materials Literature
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Fourier transform infrared reflection absorption spectroscopy (FT‐IRAS) and polarization resistance measurements have been used to investigate the surface structure and inhibiting properties of all four monosubstituted methylbenzotriazoles on copper surfaces. The formation of a protective barrier layer is strongly dep…
ANION-EXCHANGE IN LITHIUM ALUMINATE HYDROXIDES
A B ST R A C T : Well-cuttings and core samples from four Gulf Coast areas have been examined by high-resolution scanning-transmission electron microscopy and other techniques to detail the chemical, mineralogical and textural changes during diagenesis. Wells in each of the four areas exhibit a distinct smectite-to-il…
The isotropic-symmetry-breaking bifurcations occurring in a class of liquid-crystal models describing particles with the symmetry of rectangular slabs are studied. The model free-energy functional employed is appropriate to both the mean-field treatment of anisotropic dispersion forces and the Onsager approximation fo…
The tight binding band electronic structures of the molecular conductors X[M(dmit)2]2 (X = TTF, (CH3)4N ; M = Ni, Pd) are reported. In the cases of TTF(Ni(dmit)2] 2, α- and α'-TTF [Pd(dmit)2]2, it is shown that both the LUMO (lowest unoccupied molecular orbital) and HOMO (highest occupied molecular orbital) bands of t…
Ten members of the homologous series α,ω-bis(2,4-dimethylanilinebenzylidine-4′-oxy)alkanes and four members of the α-(4-cyanobiphenyl-4′-oxy)-ω-(2,4-dimethylanilinebenzylidine-4′-oxy)alkanes have been synthesized. Their transitional properties are compared to those of the analogous compounds not possessing the 2-methy…
A number of α- and β-glycosides with long chain aliphatic alcohols as aglycones were prepared, and the liquid-crystalline properties of the various mono-, di, and trisaccharide series compared. Further, the first liquid-crystalline glycosides of glucuronic acid and of an amino sugar hydrochloride were detected. It may…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic interactions between t2g3 and eg2 magnetic orbitals in a chromium(III)nickel(II)3 tetranuclear compoundYu Pei, Yves Journaux, and Olivier KahnCite this: Inorg. Chem. 1989, 28, 1, 100–103Publication Date (Print):January 1, 1989Publication History Published onlin…
Experimental results from electrochemical e.s.r. on electrodes modified with conducting polymers such as polyaniline, polypyrrole and polythiophene are presented. The results show that the polymer exists in two forms, one stable when it is insulating (α) and the other (β) when it is conducting. In the conducting regio…
High enantioselectivities (up to 96% ee), almost quantitative chemical yields, and mild reaction conditions characterize the title reaction. It is suitable, for example, for the synthesis of isoprenoid chains as occur in the vitamins E and K1. An example is reaction (a), R CH2OSiMe2tBu.
Local phase separation at the growth front of a spherulite has been found during crystallization in a polymer mixture of poly(\ensuremath{\epsilon}-caprolactone) and polystyrene. The phenomenon can be qualitatively explained by the coupling between the preferential rejection of impurities (polystyrene) during crystall…
The up-conversion of infrared radiation into green, red, and 805-nm fluorescence has been studied for ${\mathrm{Er}}^{3+}$ and ${\mathrm{Tm}}^{3+}$ ions in both ${\mathrm{Yb}}^{3+}$-doped and non-${\mathrm{Yb}}^{3+}$-doped ${\mathrm{BaF}}_{2}$-${\mathrm{ThF}}_{4}$ fluoride glass over a wide temperature range and sever…
The nature of the species formed in solutions of [MoO4]2– and [WO4]2–(1–0.1 mol dm–3) in the presence of H2O2(5–0.5 mol dm–3) from pH 12 to acid has been studied by Raman and i.r. spectroscopy and, for molybdenum-containing species, by 95Mo n.m.r. spectroscopy. The polymerisation processes are far less complex in the…
The nature of heterogeneous deformation bands and the mechanism of Goss texture formation have been studied in the process of cold rolling and annealing of 3%Si–Fe (111)[112] single crystals. After cold rolling, two kinds of shear bands are observed. Wide shear bands (type I) make an angle of 35° to the rolling direct…
The corrosion rate of AA(1) 7075 aluminum alloy in 0.1 M sodium chloride solution is decreased by the addition of 1000 ppm of FeCl2, cocl2, NiCl2, YCl3, LaCl3, NdCl3, PrCl3, or CeCl3. In each case, the protective cation is slowly incorporated into the oxide film which develops on the alloy surface during exposure to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBroensted superacidity of hydrochloric acid in a liquid chloroaluminate. Aluminum chloride - 1-ethyl-3-methyl-1H-imidazolium chloride (55.O m/o AlCl3)G. P. Smith, A. S. Dworkin, R. M. Pagni, and S. P. ZinggCite this: J. Am. Chem. Soc. 1989, 111, 2, 525–530Publication Date (P…
Catalysis, Mechanisms, and Kinetics of Polymerization. Reactivity in radical copolymerization. Synthesis of Polymers and Novel Structures. Synthesis and properties of dendrimers and hyperbranched polymers. Advanced Polymer Characterization Methods. Recent advances in optical microscopy and its application to the chara…
A B S T R A C T: A study of the ion-exchange properties of montmorillonite has been performed in order to facilitate computer predictions of the chemical properties of natural fluids and mineral assemblies. Clay/electrolyte interactions can be described using a technique based on the concept of hypothetical surface co…
Two series of discotic liquid crystals, one based on metal-free and the other on copper containing phthalocyanine (Pc) as the central core and eight peripherally n-alkoxy groups (C6–C12) as substituents have been synthesized and their mesomorphic properties and structural parameters have been determined. These compoun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle x-ray scattering characterization of agarose sols and gelsM. Djabourov, A. H. Clark, D. W. Rowlands, and S. B. Ross-MurphyCite this: Macromolecules 1989, 22, 1, 180–188Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published…