Materials Literature
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Abstract— Fluorescence quantum yields and singlet lifetimes for a wide range of hydrophilic to hydrophobic porphyrins and metalloporphyrins have been determined in toluene, methanol or acetone. Photosensitized singlet oxygen yields have been determined in the same solvents. For some porphyrins, the same quantities wer…
Long- and short-range structural order of nanocrystalline ZnO films grown using single source chemical vapor deposition (SS-CVD) of basic zinc acetate Zn 4 O(CH 3 COO) 6 have been investigated. The addition of a low background pressure of H 2 O during SS-CVD provides a mechanism for varying the structural properties t…
We investigate the optical transmission fingerprints in structures that exhibit deterministic disorders. A class of models that has attracted particular attention in this context are the quasiperiodic dielectric multilayers that obey a substitutional sequence. These substitutional sequence are characterized by the nat…
Using a side-chain mesogenic polymer stabilized ferroelectric liquid crystal display (PS-FLCD) cell together with a two-dimensional array of red, green and blue light-emitting diodes (LEDs) as a modulated back light unit, we constructed a field sequential fullcolor (FSC) LCD. The PS-FLCD used in this research exhibits…
We report a semiempirical method for the evaluation of bond covalency in complex crystals. This method is the extension of the dielectric description theory delivered by Phillips, Van Vechten, Levine, and Tanaka (PVLT) which is mainly suitable for binary crystals. Our method offers the advantage of applicability to a…
Direct coagulation casting is a novel near‐net‐shape method for forming ceramic green bodies from homogenous high‐solids‐loaded particle suspensions. It is based on the principle of the in situ coagulation of a powder suspension via a reaction‐rate‐controlled internal‐enzyme(urease)‐catalyzed reaction after casting. L…
The evolution of a three-dimensional (3D) grain structure is simulated by a vertex dynamics method. Normal grain growth is simulated and two-dimensional (2D) sections and the 3D structure are analysed and compared with a 2D simulation. It is shown that 2D sections of a 3D structure can be distinguished from a pure 2D…
Amorphous SiO 2 fracture surfaces created under different partial pressures of water vapor ( p H2O ) were analyzed using temperature‐programmed static secondary ion mass spectroscopy. The results were used to develop an atomistic model for the formation of a fracture surface. It was found that substantial reconstructi…
Studies of the temperature coefficient of permittivity of Ba 6-3 x R 8+2 x Ti 18 O 54 ( R =La–Gd) solid solutions revealed a high degree of correlation with the ratio of mean radii ( r A / r B ) of A - and B -site ions. Single-crystal X-ray diffraction analyses of La, Sm and Pr analogues showed that r A / r B can be f…
Doped polyaniline (PANI) was synthesized by an “in situ doping polymerization” method in the presence of different sulfonic acids, such as methanesulfonic acid (MSA), p-methylbenzene sulfonic acid (MBSA), β-naphthalenesulfonic acid (β-NSA), α-naphthalenesulfonic acid (α-NSA), 1,5-naphthalenedisulfonic acid (1,5-NSA),…
The polyhydroxyalkanoic acid (PHA) granule-associated 16-kDa protein (GA16 protein) of Paracoccus denitrificans was identified, and its corresponding gene was cloned and analyzed at the molecular level. The N-terminal amino acid sequence of GA16 protein revealed that its structural gene is located downstream from the…
A spectacular increase in the coercive field with values as high as 1.7 Tesla has been observed in the family of layered molecular magnets A[MIIMIII(ox)3] for the FeIII/CrIII mixed metal alloys, where MII = Mn, Fe, Co, Ni, Cu; MIII = Cr, Fe; ox = oxalate; and A = organic or organometallic cation. In these novel molecu…
By using 193 nm laser photolysis and cavity ring-down spectroscopy to produce and monitor the propargyl radical (CH 2 CCH), the self-reaction and oxygen termolecular association rate coefficients for the propargyl radical were measured at 295 K between total pressures of 300 Pa and 13300 Pa (2.25 and 100 Torr) in Ar,…
Three-dimensional cross-slipped core structures of (a/2)[110] screw dislocations in model fcc structures are simulated using lattice statics within the embedded-atom method (EAM) formalism. Two parametric EAM potentials fitted to the elastic and structural properties of fcc Ni were used for the simulations. The two- a…
An x-ray absorption fine-structure (XAFS) spectroscopy beamline, BL01B1, was installed at a bending magnet source at SPring-8 and has been open to users since October 1997. It was designed for XAFS experiments covering a wide energy range. Position tables and automatical control programs were established to adjust the…
The dielectric properties of PZT and barium titanate based ferroelectric ceramics have been determined over a wide range of electric field strength (0.05 to 4.0 kV mm−1) by analysis of P-E (polarisation-electric field) hysteresis data. Three different types of dielectric behaviour were identified, depending on the app…
The study of thermoelectric materials has recently been revived as an active research field, in part due to the recent demonstration of enhancement in the thermoelectric figure of merit of a two-dimensional (2D) PbTe quantum well system, relative to its three-dimensional (3D) bulk counterpart. Calculations suggest tha…
The particle size effect on the coordination number in nanoparticles is much stronger for more distant coordination shells than for the first nearest neighbor shell. We show, using the EXAFS analysis of carbon-supported Pt and Pt-Ru nanoparticles, that it is possible to analyze the structure of mono-and heteroatomie p…
The use of lead-free materials in piezoelectric ceramics has recently become a very important issue in environmental protection of the earth. Some lead-free piezoelectric materials, namely bismuth sodium titanate, (Bi1/2Na1/2)TiO3 (BNT) – based solid solution ceramics, such as (1-a)BNT-a·BaTiO3 [BNBT], (1-b)BNT-b·NaNb…
The 4,4‘-disubstituted azobenzene ligands HL a - d react with [(η 3 -C 4 H 7 )Pt(μ-Cl)] 2 to give the dinuclear cycloplatinated complexes [(L a - d )Pt(μ-Cl)] 2, which are easily converted to their mononuclear Pt(II) acetylacetonate derivatives [(L a - d )Pt(acac)]. Oxidative addition to the square-planar Pt(II) compl…