Materials Literature
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Mechanism of the oxidative dimerization of DTF (dithiafulvenes) to form TTF vinylogues (tetrathiafulvalenes) has been investigated by cyclic voltammetry at low and high scan rates for a series of substituted DTF. It involves first the formation of the cation radical which couples to form the protonated dication. This…
In this study, the authors investigated the tribological performance of diamond and diamondlike carbon (DLC) films as a function of temperature. Both films were deposited on silicon carbide (SiC) by microwave plasma chemical vapor deposition and ion-beam deposition processes. Tribological tests were performed on a rec…
The dielectric relaxation processes of a ferroelectric liquid crystal material with a first order phase transition (chiral-nematic to smectic-${\mathit{C}}^{\mathrm{*}}$) have been investigated using thin, gold coated electrode cells in the frequency range of 10 Hz to 13 MHz. The results have been reported for planar…
A new phenyltin tungstosilicate derivative, [(PhSnOH(2))(2)(gamma-SiW(10)O(36))(2)](10)(-) (1), has been prepared by reaction of phenyltin trichloride with K(8)[gamma-SiW(10)O(36)].xH(2)O. The new heteropolyanion was characterized by elemental analysis, infrared spectroscopy, multinuclear NMR, and X-ray crystallograph…
We have prepared Lactobacillus casei dihydrofolate reductase containing biosynthetically incorporated (2 S,4 S )-5-fluoroleucine ([5-F]-Leu DHFR) and have obtained its 1 H and 19 F NMR spectra at 9.4 Tesla. The 19 F spectrum of [5-F]-Leu DHFR showed 12 fairly sharp peaks (one containing two overlapped signals) for the…
Several cobalt nitrosyl porphyrins of the form (T(p/m-X)PP)Co(NO) (p/m-X = p-OCH(3) (1), p-CH(3) (2), m-CH(3) (3), p-H (4), m-OCH(3) (5), p-OCF(3) (6), p-CF(3) (7), p-CN (8)) have been synthesized in 30-85% yields by reaction of the precursor cobalt porphyrin with nitric oxide. Compounds 1-7 were also prepared by reac…
A poly(vinyl alcohol) (PVA)-degrading mixed culture that consisted of sereval microorganisms was obtained from activated sludge from a textile factory. From the culture, a component bacterial strain, BX1, that degraded PVA was isolated, and was identified as Bacillus megaterium. This strain could degrade PVA only in t…
Polycarboxylic acids have been used as cross-linking agents for cellulose to increase the wet strength of paper. In this research, we applied Fourier transform infrared (FT-IR) spectroscopy to study the kraft paper treated with poly(maleic acid) and 1,2,3,4-butanetetracarboxylic acid. FT-IR spectroscopy is used to mea…
We present experimental results of a thermoreversible morphological transition between spheres and cylinders for polystyrene- block -polyisoprene diblock copolymers (SI) in dioctyl phthalate solutions. Morphologies were characterized using small-angle X-ray scattering (SAXS), and spherical and cylindrical states were…
The preparation of a bis-copper(II) complex of an expanded porphyrin is described. A single-crystal X-ray structural analysis of this complex showed the two metal centers to lie within the mean plane of the macrocycle with a rather short interatomic distance of 2.761(1) Å. The two metal centers are formally in the +2…
Mo L 3 -edge XANES and diffuse reflectance UV−vis spectra have been recorded for structural studies of Mo−Mg binary oxides which catalyze metathesis reactions of olefins after pretreatment with H 2 at 773 K. The XANES of reference compounds revealed that the local symmetry around the Mo ion as well as the valence stat…
By extensive and systematic molecular dynamics simulations eight stable cellulose crystal structures have been identified. We organized them in a coherent scheme, which gives a clue to possible interconversions between the various structures. From this scheme it can be inferred that mercerized cellulose II could in fa…
Studied were evolution of dislocation structure, phase, and element composition of binary alloys Zr-1Nb and Zr-2.5Nb and multicomponent alloys Zr-1Nb-1.2Sn-0.4Fe and Zr-1.2Sn-0.4Fe under neutron irradiation. The investigations were carried out using cladding and pressure tubes before and after irradiation to a fluence…
Soluble collagen from fish (sardine) scales was yielded at about 5% with 0.5 M acetic acid after demineralization with EDTA, while a great portion of the collagen remained insoluble. The solubility of this insoluble collagen was about 20% at 45 degrees C (denaturation temperature of soluble collagen) for 24 h. The rem…
A general route has been developed to chemically modify a series of poly(ethylene oxide)-poly(propylene oxide) triblock copolymers with molecular weights from 6500 to 14600. It is initiated by the introduction of p-nitrophenyl groups; such nitrophenyl conjugated copolymers are stable in an organic milieu and in a dry…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPhotomodulated Blocking of Gramicidin Ion ChannelsLinda Lien, Dominic C. J. Jaikaran, Zhihua Zhang, and G. Andrew WoolleyView Author Information Department of Chemistry, University of Toronto 80 St. George Street, Toronto, M5S 3H6, Canada Cite this: J. Am. Chem. Soc. 1…
We have studied the equilibrium structure of a grafted polymer layer composed of two distinct species of homopolymers, the “binary brush”, in various solvent conditions. By using a coarse-grained simulation method that involves direct calculation of the Edwards hamiltonian, we are able to simulate much larger systems…
A series of mixed-substituent poly(organophosphazenes) with ethyleneoxy side groups has been synthesized. These polymers possess multiple electron-donor coordination sites that can form complexes with metal salts and generate “solid electrolyte” behavior. The polymers were characterized by 31 P, 1 H, and 13 C NMR spec…
The synthesis and solution and thin film characterization of four octasubstituted phthalocyanines (Pcs) are reported. [2,3,9,10,16,17,23,24-octakis(dodecylcarboxylato)phthalocyaninato]copper, [2,3,9,10,16,17,23,24-octakis( N -dodecylamide)phthalocyaninato]copper, and [2,3,9,10,16,17,23,24-octakis(2-(benzyloxy)ethoxy)p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTMorphological Characteristics of SEBS Thermoplastic Elastomer GelsJonathan H. Laurer, Rudy Bukovnik, and Richard J. SpontakView Author Information Department of Materials Science & Engineering, North Carolina State University, Ralei…