First- and second-order charged particle optics
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The synthesis of pure n-paraffins with chain-lengths between one and four hundred
Syntheses are described for pure paraffins having 102, 150,198, 246, and 390 carbon atoms; unlike lower homologues, all but the first show interesting properties in the solid state, bridging the gap between the chain-extended and the chain-folded modes of crystallisation typical of the lower n-paraffins and the linear…
Lattice Parameter Variation and Thermodynamics of Dihydride Formation in the Vanadium-Rich V—Ti—Fe/H2 System*
Article Lattice Parameter Variation and Thermodynamics of Dihydride Formation in the Vanadium-Rich V—Ti—Fe/H2 System* was published on January 1, 1985 in the journal Zeitschrift für Physikalische Chemie (volume 145, issue 1-2).
Chemical characteristics of cellulosic liquid crystals
Cellulosic derivatives form an interesting range of polymer liquid crystals. They belong to a class of mesophases in which the polymer chain is stiff or semiflexible and is chemically homogeneous. The cellulose backbone, a single-stranded homopolymer of β-linked 1,4-anhydroglucose units, contains three hydroxy groups…
The order parameters < P2 > and < P 4 > in nematic p-alkyl-p' -cyano-biphenyls : polarized Raman measurements and the influence of molecular association
Values for the order parameters < P2 > and < P4 > from polarized Raman measurements are reported for the homologous series of nematic alkylcyanobiphenyls. With increasing chain length a change of behaviour is observed from « low » < P4 >-values to higher values corresponding to the Maier-Saupe mean-field theory. In ad…
Studies on the constituents of asclepiadaceae plants. LX. Further studies on glycosides with a novel sugar chain containing a pair of optically isomeric sugars, D- and L-cymarose, from Cynanchum wilfordi.
Seven new glycosides named wilfosides D1N (7), K1N (8), M1N (9), F1N (10), W1N (11), W3N (12), and G1G (13) were isolated from Cynanchum wilfordi HEMSLEY (Asclepiadaceae), and their structures were deduced on the basis of spectral and chemical evidence. A unique feature is that 7-11 and 13, as well as wilfosides C1N (…
Fixed-Wall Versus Flexible-Wall Permeameters
Permeameters are of two general types: fixed-wall and flexible-wall cells. A controversy has developed over which type of cell is best suited for measuring the hydraulic conductivity of relatively impermeable, fine-grained soils. The various types of permeameters are discussed and their relative advantages and disadva…
Catalysis by heteropoly compounds. VIII. Reduction-oxidation and catalytic properties of 12-molybdophosphoric acid and its alkali salts. The role of redox carriers in the bulk
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis by heteropoly compounds. VIII. Reduction-oxidation and catalytic properties of 12-molybdophosphoric acid and its alkali salts. The role of redox carriers in the bulkNoritaka Mizuno, Tetsuji Watanabe, and Makoto MisonoCite this: J. Phys. Chem. 1985, 89, 1, 80–85Publ…
Effect of degree of crosslinking on water transport in polymer microparticles
Abstract The water transport in microparticles of poly(2‐hydroxyethyl methacrylate) crosslinked with small amounts of ethylene glycol dimethacrylate was investigated as a function of time. Dynamic swelling curves were obtained and analyzed with a simple, empirical, exponential expression, where the exponent n indicate…
Reversible formation and disruption of micelles by control of the redox state of the surfactant tail group
Reversible disruption and re-formation of micelles is observed by following the redox reaction of the redox-active micelles formed by the bromide salt of (11-ferrocenyl)undecyltrimethylammonium having a ferrocene moiety instead of the terminal methyl proton.
Studies on the constituents of Asclepiadaceae plants. LVIII. The structures of five glycosides, cynatratoside-A, -B, -C, -D, and -E, from the Chinese drug "Pai-Wei," Cynanchum atratum BUNGE.
The chemical components of the Chinese crude drug "Pai-Wei, " dried root of Cynanchum atratum BUNGE (Asclepiadaceae), have been studied. Five new oligoglycosides named cynatratoside-A (3), -B (4), -C (6), -D (8), and -E (9) were isolated by column chromatography and their structures were determined on the basis of che…
Twisted architectures in cell‐free assembled collagen gels: study of collagen substrates used for cultures
Reprecipitated fibrils from collagen solutions assemble into aggregates often showing a remarkable twisted structure. We first observed these aggregates in collagen gels prepared to facilitate culture of epithelial cells. We verified that these structures form in the absence of cells and correspond to a process of sel…
Changes Induced in the Properties of Wool by Specific Epicuticle Modification
The treatment of wool under anhydrous (non‐swelling) conditions with potassium tert‐butoxide dissolved in tert‐butanol was studied. The aim was to confine reaction with the alkaline reagent to the outer surface of the fibre, thus preventing whole‐fibre degradation. It appears that the a/koxide specifically reacts with…
The synthesis, magnetic, electrochemical, and spectroscopic properties of diruthenium( II , II ) tetra-µ-carboxylates and their adducts. X-Ray structures of Ru 2 (O 2 CR) 4 L 2 (R = Me, L = H 2 O or tetrahydrofuran; R = Et, L = Me 2 CO)
The interaction of the reduced ‘blue solutions’ of ruthenium chloride in methanol with alkali-metal carboxylates yields the air-sensitive paramagnetic complexes, Ru2(µ-O2CR)4(R = H, Me, CH2Cl, Et, or Ph), that form weakly end-co-ordinated bis adducts, Ru2(µ-O2CR)4L2[L = H2O, MeOH, tetrahydrofuran (thf), Me2CO, or MeCN…
Diffuse Reflectance Fourier Transform Infrared Spectroscopic Study of Chemical Bonding and Hydrothermal Stability of an Aminosilane on Metal Oxide Surfaces
Fourier transform infrared spectroscopy was used to study the metal oxide/silane interface. Structures of γ-aminopropyldimethylethoxysilane (γ-APDMES) coupling agent on the surface of metal oxide powders are proposed. The structures depend on the surface characteristics of the substrate. The amine group of the silane…
Selective reflection by helicoidal liquid crystals. results of an exact calculation using the 4 x 4 characteristic matrix method
The exact calculation of the reflection from single domain aligned samples of helicoidal liquid crystals (SmC* or cholesterics) is performed using the 4 x 4 matrix formulation of Maxwell equations in anisotropic media. We show that the expansion, approximation up to the 1st order of Berreman and Scheffer, is not adequ…
SANS and SAXS studies on molecular conformation of a block polymer in microdomain space
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSANS and SAXS studies on molecular conformation of a block polymer in microdomain spaceH. Hasegawa, Takeji Hashimoto, Hiromichi Kawai, Timothy P. Lodge, Eric J. Amis, C. J. Glinka, and Charles C. HanCite this: Macromolecules 1985, 18, 1, 67–78Publication Date (Print):January…
New examples of light-induced excited spin state trapping (LIESST) in iron( II ) spin-crossover systems
Two new example are reported of (quantitative) light-induced excited spin state trapping (LIESST) in coloured polycrystalline iron(II) spin-crossover compounds, with practically infinite lifetime of the high spine state below a critical temperature (25 and 55K, respectively); LIESST now appears to be a common effect f…
Synthesis and structure of the [(OC)3Mn(cis-Nb2W4O19)]3- and [(OC)3Re(cis-Nb2W4O19)]3- anions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of the [(OC)3Mn(cis-Nb2W4O19)]3- and [(OC)3Re(cis-Nb2W4O19)]3- anionsC. J. Besecker, V. W. Day, W. G. Klemperer, and M. R. ThompsonCite this: Inorg. Chem. 1985, 24, 1, 44–50Publication Date (Print):January 1, 1985Publication History Published online1…
An Overview of Organic Charge-Transfer Solids: Insulators, Metals, and the Neutral-Ionic Transition
This presents a simple framework for studying the basic properties of the broad class of organic charge-transfer solids. It is shown that many of the differences in behavior of these materials can be described and understood in terms of a single, physical variable: δEREDOX, the difference between the electrochemical o…