Materials Literature
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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…
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.
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…
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…
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…
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.
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…
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…
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…
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…
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.
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 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…
Phosphorus-containing epoxy-based epoxy–silica hybrid materials with a nanostructure were obtained from bis(3-glycidyloxy)phenylphosphine oxide, diaminodiphenylmethane, and tetraethoxysilane in the presence of the catalyst p-toluenesulfonic acid via an in situ sol–gel process. The silica formed on a nanometer scale in…
An overview is given on the generation of metal nanoparticles dispersed within amphiphilic polymeric systems, ranging from nonionic polymers and polyelectrolytes to amphiphilic diblock copolymers. Such materials are receiving increased attention, since they offer tremendous options for the development of composites po…
A modified cellular automaton model (MCA) was developed in order to simulate the evolution of dendritic microstructures in solidification of alloys. Different from the classical cellular automata in which only the temperature field was calculated, this model also included the solute redistribution both in liquid and s…
Two-dimensional hexagonally ordered CMK-3 carbons were synthesized using SBA-15 templates calcined at a temperature of 1153 K, whereas a disordered carbon was obtained using SBA-15 calcined at 1243 K, demonstrating that the pores connecting ordered mesopores in SBA-15 silica persist up to ca. 1153 K, but are eliminate…
Cyclic deformation of ultra-fine grain (UFG) materials processed by severe plastic deformation is reviewed in light of recent experimental results and common concepts of fatigue. High strength bulk metals with a characteristic structural element size of 200–300 nm were obtained through the so-called equal-channel angu…
Density functional theory has been used to study the adsorption of hydroxyl at low and high coverages and also to investigate the nature of the intermediate in the H2O formation reaction on Pt(111). At low coverages [1/9 of a monolayer (ML) to 1/3 ML] OH binds preferentially at bridge and top sites with a chemisorptio…
There has been great demand for shape memory alloy (SMA) actuators within the field of micro-machines. However, the thermomechanical behavior of SMA actuators is too complicated to accurately predict their response. Moreover the tracking control accuracy of SMA actuators is limited due to the inherent hysteresis nonli…