Materials Literature
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A series of six new free base porphyrins were synthesized for use as photosensitizers in TiO2 dye-sensitized photo-electrochemical cells. The porphyrin sensitizers are attached to the TiO2 photoelectrode by phosphonic or carboxylic acid anchoring groups. These anchoring groups were placed on different substitution pos…
A new perspective of electron transfer chemistry is described for fine control of electron transfer reactions including back electron transfer in the charge separated state of artificial photosynthetic compounds and its synthetic application. Fundamental electron transfer properties of suitable components of efficient…
We have designed and manufactured a flanged coaxial line as a sample holder for measuring the electromagnetic interference (EMI) shielding efficiency (SE) of planar materials in broadband frequency ranges up to 18 GHz. Connecting the samples holder to a vector network analyzer (50 MHz⩽M⩽13.5 GHz), we measured the S (s…
This paper presents a hypothesis relating the exclusion of a molecule (solute) from the surface of a protein in aqueous solution with the ability of that molecule to render surfaces “protein-resistant”, that is, resistant to the adsorption of proteins from aqueous buffer. While few current data test this hypothesis, i…
We have synthesized a Eu2+-activated Sr2SiO4 yellow phosphor and investigated an attempt to develop white light-emitting diodes (LEDs) by combining it with a GaN blue LED chip. Two distinct emission bands from the GaN-based LED and the Sr2SiO4:Eu phosphor are clearly observed at 400 nm and at around 550 nm, respective…
Highly transparent ZnO-based thin-film transistors (TFTs) are fabricated with optical transmission (including substrate) of ∼75% in the visible portion of the electromagnetic spectrum. Current–voltage measurements indicate n-channel, enhancement-mode TFT operation with excellent drain current saturation and a drain cu…
Abstract Completion technologies for horizontal and subsea deep-water wells have been developed to make feasible and increase oil production. Horizontal and subsea wells in Petrobras are usually located at long distances from production facilities and in deepwater. Scale control can be implemented on these wells via b…
From microwave cavity transmission measurements at 23--110 GHz on $\ensuremath{\lambda}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TSF}{)}_{2}{\mathrm{FeCl}}_{4},$ we have observed an antiferromagnetic resonance (AFMR) in the antiferromagnetic insulating state below the metal-to-insulator transition temperature…
We study growth limited by packing for irregular objects in two dimensions. We generate packings by seeding objects randomly in time and space and allowing each object to grow until it collides with another object. The objects we consider allow us to investigate the separate effects of anisotropy and nonunit aspect ra…
We present the results of extensive three-dimensional off-lattice Monte Carlo simulations of two interacting spherical brushes. We have measured the interacting force in systems where curvature effects are important. Our results support a description of the force profile divided into two regimes. At short separating d…
Abstract Mit Hilfe von Einkristall‐ und Pulverdaten wurden die Kristallstrukturen der Monohydrate von Lithiumchlorid und Lithiumbromid aufgeklärt. Die Verbindungen kristallisieren isotyp in der Raumgruppe Cmcm (LiCl·H 2 O: Einkristallstrukturanalyse; T = 100 K; a = 758, 35(2); b = 768, 07(2); c = 762, 35(2) pm; Z = 8;…
1-aminocyclopropane-1-carboxylate (ACC) deaminase is a pyridoxal 5'-phosphate (PLP) dependent enzyme which catalyzes the opening of the cyclopropane ring of ACC to give alpha-ketobutyric acid and ammonia. In an early study of this unusual C(alpha)-C(beta) ring cleavage reaction, 1-amino-2-methylenecyclopropane-1-carbo…
The conductivity of polyethylene oxide (PEO) is described with a three-dimensional hopping model considering electrostatic interactions between the ions. Ions fluctuate over energy-barriers in a multi-well potential. To decide whether positive or negative charges are responsible for this conductivity, the thermoelectr…
Abstract A new range of polymeric scale inhibitors has been developed combining exceptional scale control activity with enhanced adsorption properties. The polymers are stable up to at least 200ºC and have high activity against barium sulphate and calcium carbonate scales. By incorporating novel end-capped technology,…
In this study, α-Si3N4 particles were successfully coated with h-BN nano-film by a novel chemical route. Ammonium biborate was deposited onto the surface of silicon nitride particles to form NH4HB4O7·3H2O–Si3N4 composite powders by the heterogeneous precipitation method in anhydrous ethanol solution. The obtained comp…
The study of nucleation and growth mechanisms of salts from aqueous solutions, as a function of supersaturation, is described using both macroscopic and microscopic experiments. In situ observations in a fluid cell in an atomic force microscope (AFM) reveal phenomena not accounted for in standard crystal-growth theori…
Gold nanoparticles (2.2 nm) protected by a densely packed monolayer of 9-(9-fluorenyl)-nonane-1-thiol (MPC-b) or a mixed monolayer of 9-(9-fluorenyl)-alkane-1-thiol with nonane-1-thiol (MPC-c and MPC-d) were studied by transient spectroscopy upon 305 nm excitation with subpicosecond laser pulses. Electronic relaxation…
We report on molecular dynamics calculations of the thermal conductivity of superlattices in the direction parallel to the layers. We employ a simple, classical, fcc model that is designed to model the GaAs/AlAs system. Both rough and perfect interfaces are considered. The results are compared to experimental data fro…
The synthesis, characterization and initial reactivity studies are reported of the mixed-valence (Mn(IV)6Mn(III)2) title compound, which possesses an unusual serpentine-like core and is the highest average oxidation state (+3.75) Mn(x) (x > 4) cluster to date.
We determined the three-dimensional (3D) crystal structure of protein TM841, a protein product from a hypothetical open-reading frame in the genome of the hyperthermophile bacterium Thermotoga maritima, to 2.0 A resolution. The protein belongs to a large protein family, DegV or COG1307 of unknown function. The 35 kDa…