Materials Literature
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Physical organogels of cholesteryl anthraquinone-2-carboxylate (CAQ) and an organic liquid have been studied by small-angle neutron and X-ray scattering techniques. The gel structure consists of long and rigid fibers of CAQ interconnected in swollen lyotropic microdomains. The nature of the “junction zones” of the thr…
Structural investigations using EXAFS spectroscopy and standard analytical methods were performed on electrochemically synthesized tetrabutylammonium bromide stabilized Pd/Pt bimetallic clusters with different Pd/Pt ratios. The results of these investigations allow the determination of a detailed model concerning the…
A series of cyclic aromatic disulfide oligomers have been synthesized in high yields by catalytic oxidization of arenedithiols in DMAc. The aryl groups contain moieties such as ketone, sulfone, isopropylidene, ether, thioether, and phenylphosphine oxide groups. The cyclic aromatic disulfide oligomers have been analyze…
The synthesis of a range of hydroxypyranones and hydroxypyridinones with potential for the chelation of indium(III) is described. The crystal structures of two of the indium complexes are presented. The distribution coefficients of the ligands and the corresponding iron(III), gallium(III), and indium(III) complexes ar…
The reaction of Pb and Eu with a molten mixture of A(2)Se/P(2)Se(5)/Se produced the quaternary compounds APbPSe(4), A(4)Pb(PSe(4))(2) (A = Rb,Cs), and K(4)Eu(PSe(4))(2). The red crystals of APbPSe(4) are stable in air and water. The orange crystals of A(4)Pb(PSe(4))(2) and K(4)Eu(PSe(4))(2) disintegrate in water and o…
The group refractive index and physical thickness of dry and hydrated type I collagen films are measured using optical low-coherence reflectometry. The average value for the group refractive index of dry and fully hydrated collagen films at lo = 850 nm is, respectively, 1.53 6 0.02, and 1.43 6 0.02. The physical thick…
We study spatially ordered phases in a rod−coil diblock copolymer melt. In the weak segregation limit, we solve the self-consistent field equations by a partial numerical evaluation of the single chain partition function. In the strong segregation limit, we resort to a brushlike approximation. The structural asymmetry…
NiO−MgO samples (Ni x Mg 1- x O: x = moles of Ni/(moles of Ni + moles of Mg)) were prepared by impregnation of MgO powder with an aqueous solution of Ni(NO 3 ) 2, followed by calcination at 773 K. The dispersion of Ni ions in these samples has been studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (…
Chemical activation and process intensification is provided through ultrasonically-induced cavitation in a liquid medium, a process often described as sonochemistry. Examples are chosen from a number of fields which illustrate the wide ranging applicability of this technology in the chemical and processing industries.…
An improved synthesis of the prototype polyoxoanion−organometallic-support system, P 2 W 15 Nb 3 O 62 9 -, as its organic solvent-soluble all-[( n -C 4 H 9 ) 4 N] + salt is described. The improvements result in a 30% faster procedure which also provides a 60% increase in yield of [( n -C 4 H 9 ) 4 N] 9 P 2 W 15 Nb 3 O…
Spectroelectrochemical behaviour of regioregular poly(3-octylthiophene) has been investigated using UV–VIS–NIR and Raman spectroscopies. Static and dynamic UV–VIS–NIR spectroelectrochemical experiments combined with cyclic voltammetry show that oxidative doping of the regioregular polymer is a two-step process in whic…
Two new thermally irreversible photochromic ( R )-binaphthol-condensed indolylfulgides (with a 1-(1,2-dimethyl-3-indolyl)-2-methylpropylidene group and with a 1-(1,2-dimethyl-3-indolyl)butylidene group, 6 and 7, respectively) were synthesized. Because of rapid thermal equilibration between the conformational isomers o…
Mercury ions, Hg 2+, are radiolytically reduced in an aqueous silver sol. The plasmon absorption band of silver is blue-shifted, which is explained by the formation of a solid mercury layer around the silver particles. The metal deposition stops when the silver particles carry about two monolayers of mercury and the a…
We report stochastic calculations in compact 2-D lattices modeling the competition between electron−hole recombination and reactive processes on the surface of illuminated TiO 2 colloidal particles. Computer simulations in which holes perform unbiased random walks, react with oxidizable donors, or neutralize stationar…
Tetraethylsulfamide (TESA), (CH 3 CH 2 ) 2 NSO 2 N(CH 2 CH 3 ) 2, is a nonvolatile liquid of moderate permittivity (ε = 29) that exhibits a good stability toward reducing agents. This glass-forming liquid ( T g = −111 °C) is compared to propylene carbonate (PC, ε = 65, T g = −110 °C) as diluent for PEO−LiN(CF 3 SO 2 )…
A negative working photosensitive polyimide based on poly(hydroxyimide) (PHI), 2,6-bis(hydroxymethyl)-4-methylphenol (BHMP) as cross-linker, and photoacid generator diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (DIAS) has been developed. The PHI was prepared by the ring-opening polyaddition of 4,4‘-hexafluoroi…
The crystal structure of the stable crystalline form of syndiotactic polypropylene (s-PP) may be taken, only as a first approximation, as body-centered orthorhombic and described in the space group Ibca (in which the chains maintain their full, ideal 2 1 22 symmetry). Indeed, the splitting of the resonance of the meth…
Pyrroles fused with aromatic rings (isoindole derivatives) have been readily prepared by the reaction of aromatic nitro compounds with ethyl isocyanoacetate in the presence of DBU. The ease of this reaction depends on the aromaticity of the starting nitro aromatics. Polycyclic aromatic nitro compounds such as 1-nitroa…
Blends composed of poly(vinylphenol) (PVPh) and bacterial (tactic) poly(hydroxybutyrate) (PHB) and synthetic (atactic) poly(hydroxybutyrate) (PHBa) have been investigated by FTIR. From quantitative analyses of hydrogen bonded PHB carbonyl groups as a function of temperature and composition, the interassociation consta…
Low-temperature (400−800 °C) stabilization of tetragonal zirconia, prepared by a hydroxide gel route and low-temperature annealing, has been achieved by partial substitution of Zr 4+ with Bi 3+ . XRD and Raman spectroscopy have been used for characterization of the doped zirconia powders as well as for identification…