Materials Literature
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A series of ruthenium(II) porphyrin dimers and trimers (carbonyl dimers, 1-4; carbonyl trimers, 5-7, bis(pyridyl) trimers, 8-10), having axial or bridging porphyrin ligands, were synthesized and characterized by (1)H NMR and IR spectroscopy and mass spectrometry. An X-ray structural determination of Ru(II)(OEP)(CO)(H(…
The photopolymer material of poly(vinyl cinnamate) (PVCi) has been used to investigate the contribution of the anisotropic van der Waals force to the azimuthal anchoring energy in a pentyl cyanobiphenyl (5CB)/PVCi system. The optical anisotropy of a PVCi film is precisely controlled by varying the exposure time of lin…
Neutron and synchrotron X-ray powder diffraction techniques have been used to refine the crystal and magnetic structures of the n = 2 Ruddlesden−Popper (RP) system Sr 2 LaMn 2 O 7 . The sample is shown to be biphasic, although both phases are of the RP type and have similar structural parameters. The majority phase (8…
The equation traditionally used to interpret temperature programmed desorption (TPD) spectra, the Polanyi–Wigner equation, does not contain explicitly the coverage and temperature dependence necessary to predict TPD spectra in several important systems including CO–Ni(111). Herein, the statistical rate theory (SRT) ap…
Abstract The melting of poly(ethylene terephthalate) is analyzed by quasi‐isothermal, temperature‐modulated differential scanning calorimetry. The measurement is done by sinusoidally changing the temperature in the melting range (± 1.0 K). In the melting range a small portion of the sample melts reversibly. This obser…
It is argued that a pulsating acoustically levitated bubble cannot possibly maintain a spherical shape. A jet forms during compression, and the sound amplitude such that the jet first strikes the other side of the bubble with sufficient energy is hypothesized to be the threshold for sonoluminescence. It is proposed th…
The three-dimensional solution structure of the RNA self-complementary duplex [formula in text] was derived from two-dimensional NMR and the iterative relaxation matrix approach. Each GA mismatch forms two hydrogen bonds: A-NH6 to G-O6 and A-N1 to G-NH1 (imino). This GA structure differs from the sheared tandem GA str…
Monitoring thermal conductivity changes in thin-sliced cellular plastics has drastically reduced the time required to evaluate the long-term aging of insulating foams. Monitoring the weight changes of closed-cell thin-slices provides data which can be analyzed to determine the effective diffusivity of atmospheric and…
Other| April 01, 1997 Changes in the crystal structure of tsaregorodtsevite [N(CH3)4 ][Si2 (S0.5 Al0.5)O6 ]2 on heating Barbara L. Sherriff; Barbara L. Sherriff University of Manitoba, Department of Geological Sciences, Canada Search for other works by this author on: GSW Google Scholar Elena V. Sokolova; Elena V. Sok…
Abstract Variables affecting the high temperature oxidation of steel were investigated using an experimental design strategy. The experimental methods included continuous mass‐gain measurement to characterize the oxidation kinetics in terms of parabolic rate constants. A Morris and Mitchell (1983) eleven‐run experimen…
An experimental set-up is described which allows the calorimetric determination of the heat defect of solids and fluids relative to that of gilded copper which is used as the reference material. The calorimeter operates in a quasi-adiabatic mode and is suitable for protons, deuterons, alpha particles and other heavy i…
X-ray photoelectron spectra of core levels are reported for InP:Yb. Crystalline InP, doped with Yb to a level of 0.5 at.%, was grown by the synthesized solute diffusion method. An analysis of the core-level spectra of the constituent components, i.e. In 3d512 and P 2p, revealed a minor influence of the surface oxide s…
Abstract Copoly(amide‐ethers) containing two types of tertiary amine units were made as antistatic modifiers for poly(ethylene terephthalate) (PET) fibers. The filaments of the copolymers were melt‐spun and reacted with three alkylating agents in order to quaternize the tertiary amine into a sulfo‐betaine, a carbobeta…
High‐temperature ionic conductivity of zirconia–calcia (ZrO 2 –CaO), zirconia–yttria (ZrO 2 Y 2 O 3 ), and zirconia–rareearth‐oxide (ZrO 2 RE 2 O 3 ) solid solutions was measured at temperatures of 1000°–1600°C. The emf polarization method and a thermodynamic emf method using a new reference system (aluminum melt coex…
Abstract Feinglosite, the zinc analogue of arsenbrackebuschite, was found lining a cavity in a sample of massive chalcocite from Tsumeb, Namibia. In this cavity it is associated with wulfenite, anglesite and goethite. The mean of seven electron-microprobe analyses (wt.%) is: PbO 61.4, ZnO 7.3, FeO 1.8, As 2 O 5 22.1,…
The solid state structure of dilithium tetraphenylporphyrin bis(etherate) has been determined by X-ray crystallography. The structure shows the lithium atoms are displaced out of the plane of the porphyrin, each coordinated in a square pyramidal fashion to the four nitrogen atoms in addition to a molecule of diethyl e…
In this paper the origin of nonlinearities of the K[B5O6(OH)4] · 2 H2O (KB5) crystal has been investigated from a comprehensive view-point by using the bond-valence theory of complex crystals. The results of the calculation (d31 = —1.18 × 10—10 esu, d32 = 0.20 × 10—10 esu, and d33 = —1.03 × 10—9 esu) are in good agree…
High conversion of wastewater into biomass of photosynthetic bacteria was investigated. This biomass is possibly utilized as feed for fish or extraction source of PHA (polyhydroxyalkanoate). As a fundamental investigation, batch experiments were carried out using purple nonsulfur bacteria Rhodobacter sphaeroides to de…
Comprehensive acoustic measurements on bouncing particles in a gas insulated substation (GIS) have been carried out. The objective is to find parameters that both are available from external acoustic measurements and usable for assessing whether a particle has the potential to cause an insulation breakdown. The elapse…
Structures of mixed crystals of the isomorphous salts NaClO 3 and NaBrO 3 (sodium chlorate and sodium bromate, respectively) were reinvestigated by X-ray diffraction. Contrary to previous reports, NaCl x Br 1− x O 3 is not cubic. Data from adjacent {100} growth sectors of crystals of varying composition were refined i…