Supramolecular dendritic two-component gel
Dendritic peptides with a carboxylic acid at the focal point of the branched structure form a two-component supramolecular organogel with a linear aliphatic diamine in non-hydrogen-bonding solvents.
Materials Literature
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Synthesis and Characterization of Hydrous Ruthenium Oxide-Carbon Supercapacitors
It is shown that composite Ru oxide-carbon based supercapacitors possess superior energy and power densities as compared to bare carbon. An electroless deposition process was used to synthesize the ruthenium oxide-carbon composites. Ru is dispersed on the carbon matrix as small particles. The effect of electrochemical…
Dielectric spectroscopy for diagnosis of water tree deterioration in XLPE cables
An HV dielectric spectroscopy system has been developed for diagnostics of water tree deteriorated extruded medium voltage cables. The technique is based on the measurement of nonlinear dielectric response in the frequency domain. Today's commercially available systems are capable of resolving low loss and small varia…
Applied Solid Mechanics
The world around us, natural or man-made, is built and held together by solid materials. Understanding their behaviour is the task of solid mechanics, which is in turn applied to many areas, from earthquake mechanics to industry, construction to biomechanics. The variety of materials (metals, rocks, glasses, sand, fle…
Ruthenium Oxide Thin Film Electrodes for Supercapacitors
A ruthenium oxide thin film electrode with an average specific capacitance of 650 F/g and good high rate capability was prepared by electrostatic spray deposition (ESD). This technique is a one-step process of preparing ruthenium oxide thin film electrode compared with a multistep sol-gel process and has features of l…
Hydrothermal syntheses and structures of three one-dimensional heteropolytungstates formed by Dawson or Keggin cluster units
Single crystals of [Cu(en)2(OH2)]2[H2en][{Cu(en)2}P2CuW17O61]·5H2O 1, [Cu(en)2(OH2)]2[Cu(en)2]0.5[H2en]0.5[{Cu(en)2}P2CuW17O61]·5H2O 2 and [Co(dpa)2(OH2)2]2[Hdpa][PCoW11O39] 3 (dpa = di-2-pyridylamine) have been hydrothermally synthesized and characterized by IR, TGA and single-crystal structural analysis. Compounds 1…
Preparation of monodispersed nanocrystalline CeO2 powders by microwave irradiation
Monodispersed nanocrystalline CeO2 powders of size ca. 2.0 nm displaying quantum size effects have been prepared by microwave irradiation in an aqueous solution containing (NH4)2Ce(NO3)6, PEG and NaAc.
Recent advances in electrooptic polymer modulators incorporating highly nonlinear chromophore
Based on a nonlinear optical polymer with a highly nonlinear chromophore (CLD) dispersed in an amorphous polycarbonate (APC), we have developed electrooptic (EO) polymer modulators operating at 1550-nm wavelength with low loss and good thermal stability. By incorporating polymer insulation layer, push-pull poling was…
Adsorption and activity of cytochrome c on mesoporous silicates
Cytochrome c (horse heart) has been adsorbed onto a range of mesoporous silicate materials with the extent of adsorption dependent on the silicate pore size; adsorption and activity profiles of the adsorbed protein are reported.
Applying biological principles to the assembly and selection of synthetic superstructures
It has become clear over the past two decades that, in order to create functional synthetic nanoscale structures, the chemist must exploit a fundamental understanding of the self-assembly of large-scale biological structures, which exist and function at and beyond the nanoscale. This mode of construction of nanoscale…
Bimetallic PtSn catalyst for selective CO oxidation in H2-rich gases at low temperatures
Kinetic measurements on preferential CO oxidation in a H2-rich atmosphere (PROX) over a bimetallic, carbon supported PtSn catalyst reveal a high activity and selectivity already at low temperatures (0–80°C), superior to a commercial Pt/Al2O3 system. The selectivity, though steadily decreasing with temperature, is rema…
Ovotransferrin is a Matrix Protein of the Hen Eggshell Membranes and Basal Calcified Layer
The eggshell is an highly ordered structure deposited in the distal oviduct and composed of calcium carbonate and an organic matrix which is believed to influence its fabric. We have identified ovotransferrin as an 80 kDa matrix protein observed at high concentration in the uterine fluid at the initial stage of shell…
A novel enhancement of ionic conductivity in the cationdeficient apatite La9.33(SiO4)6O2
Al can be doped into the oxide ion conductor La9.33(SiO4)6O2 according to the formula La9.33 + x/3(SiO4)6 − x(AlO4)xO2 where 0 ≤ x ≤ 2; a conductivity enhancement of 1–2 orders of magnitude is observed for intermediate x values and illustrates the important role that La vacancies have in optimising the conductivity.
Identification of a new class of biopolymer: bacterial synthesis of a sulfur-containing polymer with thioester linkages
This is the first report on the biosynthesis of a hitherto unknown, sulfur-containing polyester and also the first report on a bacterial polymer containing sulfur in the backbone. The Gram-negative polyhydroxyalkanoate (PHA)-accumulating bacterium Ralstonia eutropha synthesized a copolymer of 3-hydroxybutyrate and 3-m…
Chromatographic Purification of Soluble Single-Walled Carbon Nanotubes (s-SWNTs)
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTChromatographic Purification of Soluble Single-Walled Carbon Nanotubes (s-SWNTs)S. Niyogi, H. Hu, M. A. Hamon, P. Bhowmik, B. Zhao, S. M. Rozenzhak, J. Chen, M. E. Itkis, M. S. Meier, and R. C. HaddonView Author Information Departments of Chemistry and Physics and Adva…
Phylogenetic analyses and comparative genomics of vitamin B6 (pyridoxine) and pyridoxal phosphate biosynthesis pathways.
Vitamin B6 in its active form pyridoxal phosphate is an essential coenzyme of many diverse enzymes. Biochemistry, enzymology and genetics of de novo vitamin B6 biosynthesis have been primarily investigated in Escherichia coli. Database searches revealed that the key enzymes involved in ring closure of the aromatic pyr…
Pit Initiation on Stainless Steels in 1 M NaCl With and Without Mechanical Stress
The onset of pitting corrosion at MnS inclusions on 304 stainless steel in 1 M NaCl was studied with and without applied mechanical stress with use of microelectrochemical cells. Polarization curves of areas (100 μm diam) without inclusion showed no pitting at potentials below that of oxidation evolution; stress had n…
Triblock copolymer assisted synthesis of periodic mesoporous organosilicas (PMOs) with large pores
Periodic mesoporous organosilicas (PMOs) with unusually large pores and high BET surface areas have been synthesized using triblock PEO-PPO-PEO copolymer P123 as the structure-directing agent and 1,2-bis(trimethoxysilyl)ethane (BTME) as the organically bridged silica source.
Facile synthesis of hollow silica microspheres
Hollow silica microspheres were synthesised at room temperature from a vortexed mixture of water and droplets of tetraethoxysilane (TEOS) containing 10 mol% aminopropyltriethoxysilane: droplets stabilized with the surfactant cetyltrimethylammonium bromide produced silica shells, 30.6 µm in mean diameter, whereas repla…
Fully undoped and soluble oligo(3,4-ethylenedioxythiophene)s: spectroscopic study and electrochemical characterization
Fully undoped oligo(3,4-ethylenedioxythiophene)s have been synthesized from polycondensation of the corresponding dibromomonomer in the presence of a catalytic Ni(0)-based complex in N,N-dimethylacetamide (DMA). HPLC analysis indicated that the material is constituted of three main oligomers which have also been clear…