Materials Literature
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The grafting of dimethyl amino ethyl methacrylate (DMAEMA) onto styrene-butadiene-styrene triblock copolymer (SBS) membrane was subsequently conducted by UV-radiation induced graft copolymerization without degassing to obtain the SBS-g-DMAEMA copolymer membrane. The substituted amino groups on the SBS-g-DMAEMA graft c…
Novel copper exchanged silicoaluminophosphates of chabazite type catalyst have been prepared. Conventional techniques such as elemental analysis, X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, nitrogen sorption capacity (BET) have been employed for the characterization of the materi…
The crystal structures have been determined and magnetic properties investigated for four novel HgBr2 complexes with pyridyl-substituted ‘nitronyl nitroxides’, 4,4,5,5-tetramethyl-2-(4-pyridyl)-(L1), -2-(2-pyridyl)-(L2), -2-(3-pyridyl)-(L3) and -2-(6-methyl-2-pyridyl)-2-imidazoline N 1-oxyl N 3-oxide (L4). Complex 1,…
A novel blue luminescent diborate compound B2(µ-O)Et2(7-azain)2 (7-azain = 7-azaindole anion) is synthesized and characterized structurally; it emits a blue color at λmax = 422 nm in the solid and at λmax = 419 nm in solution and is stable under air as a solid.
X-Ray and optical techniques have been employed to probe the physical properties of six materials that exhibit various frustrated chiral smectic phases. The temperature dependent evolution of the layer spacing, measured by small angle X-ray diffraction, is discussed with respect to the molecular structures of the mate…
A variety of organic liquids can be immobilised using certain 4-tert-butyl-1-arylcyclohexanol derivatives (BACOl). Only the isomers with axial aryl groups are active as gelling agents. The BACOl–hydrocarbon systems have been characterised with respect to their rheological properties under shear. The gels are viscoelas…
Anisotropic networks, elastomers and gels exhibit piezoelectric, pyroelectric, ferroelectric and NLO properties of potential interest for use communication and processing technologies. The formation, properties and applications of such anisotropic, mainly liquid crystalline, networks are described. If some of the mole…
The relaxivity of [GdL1]3+ in aqueous solution has been studied as a function of temperature and magnetic field strength. The complex possesses a high relaxivity at pH 6 (12.8 mmol-1 s-1) that diminishes as successive water molecules are deprotonated, leading to a complex species whose relaxivity is typical of a purel…
Macromolecular conjugates of dextran 40 (Mn = 38 kg/mol, Mw = 43 kg/mol) and diethylenetriaminepentaacetic acid (DTPA), capable of complexing Gd3+, were synthesized in order to obtain contrast agents for nuclear magnetic resonance imaging, with long intravascular persistence. As already reported, relaxivity of these m…
5,10,15,20-Tetraphenyl-26,28-dioxasapphyrin (O2TPSH) and 5,10,15,20-tetraphenyl-26,28-dithiasapphyrin (S2TPSH), heteroanalogues of 5,10,15,20-tetraphenylsapphyrin (TPSH3) have been synthesised by condensation of the respective precursors, namely 2,5-bis(arylhydroxymethyl)furan or bis(arylhydroxymethyl)thiophene and py…
A new approach to the problem of the kinetic exchange for orbitally degenerate ions is developed. The constituent multielectron metal ions are assumed to be octahedrally coordinated, and strong crystal field scheme is employed, making it possible to take full advantage from the symmetry properties of the fermionic ope…
Extended x-ray absorption fine structure at the manganese $K$ edge has been used to study the first oxygen coordination shell at the manganese site as a function of temperature in mixed-valence perovskites. ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ($x=0,$ 0.15, 0.33, 0.5, 0.66, and 1), ${\…
The kinetics of the lamellar→hexagonal→cubic transformations of mesoporous zirconia prepared by using a neutral organic amine as the amphiphile have been studied in phosphoric acid medium. The lamellar→hexagonal transformation is preceded by a loss of the template molecules and the hexagonal→cubic transformation proce…
The local electric fields on a semicontinuous metal film are shown to experience giant fluctuations in the visible and infrared spectral ranges when the dissipation in metallic grains is small. The field fluctuations result in strongly enhanced Raman scattering. The scattered local fields at the Stokes frequency are c…
Fracture of a large‐grained alumina polycrystal has been examined in situ by optical microscopy. Concurrently, local bridging stresses, as generated by friction or tension of unbroken ligaments in the wake of the crack path, were measured by piezospectroscopy. Stress measurements were performed both at fixed sites as…
A. J. Moore, M. R. Bryce, A. S. Batsanov, A. Green, J. A. K. Howard, A. Mckervey, P. Mcguigan, I. Ledoux, E. Ortí, R. Viruela, P. M. Viruela and B. Tarbit, J. Mater. Chem., 1998, 8, 1173 DOI: 10.1039/A708078F
Article Selective Transition-Metal Catalysis of Oxygen Delignification. Using Water-Soluble Salts of Polyoxometalate (POM) Anions. Part II. Reactions of α-[SiVW11O40]5- with Phenolic Lignin-Model Compounds was published on January 1, 1998 in the journal Holzforschung (volume 52, issue 3).
Enzymatic ring-opening polymerization of a 17-membered lactone, 16-hexadecanolide (HDL), was performed in bulk by using lipases of different origin as catalyst. Pseudomonas fluorescens lipase exhibited high catalytic activity toward the polymerization, producing the corresponding polymer in high yields. A higher polym…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTwo-Dimensional Microphase Separation of a Block Copolymer in a Langmuir−Blodgett FilmJiro Kumaki and Takeji HashimotoView Author Information Hashimoto Polymer Phasing Project, ERATO, JST Keihanna Plaza, Seika, Kyoto 619-02, Japan Department of Polymer Chemistry Gradua…
Homogeneous IPN polymer hybrids of polystyrene gel and silica gel were prepared by applying an in-situ polymerization method to styrene monomer and divinylbenzene. The monomers were mixed in the sol–gel reaction mixture of tetramethoxysilane and subjected to radical polymerization, resulting in transparent glassy mate…