Materials Literature
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The isophlorins already discussed by Woodward in connection with chlorophyll synthesis are Janus-faced—on one hand porphyrins (N, N′-dihydroporphyrins) and on the other true annulenes ([20] annulenes not conforming to the Hückel rule)—and as such are structurally particularly interesting. Whereas isophlorins not subst…
Abstract Grain-size distribution, specific surface, thermal analysis, electron microscopy and X-ray diffraction were used to study the effect of dry grinding on the structure and properties of two kaolins of different degree of crystallinity. Grinding caused particles to fragment and resulted in the formation of stabl…
Glass‐ceramics containing barium–mica in the system Ba 0.5 Mg 3 (Si 3 AIO 10 )F 2 –2MgO · 2Al 2 O 3 · 5SiO 2 –Ca 3 (PO 4 ) 2 are two to three times stronger than conventional mica‐containing glass‐ceramics. Moreover, the barium‐mica glass‐ceramics are easier to machine, as confirmed by a drilling test using convention…
Abstract Surface‐enhanced Raman scattering of o ‐mercaptobenzoic acid (OMBA) in silver sol was investigated. At neutral and basic pH OMBA adsorbed dissociatively on the silver surface via both its sulphur and the carboxylate group and existed as sulphidobenzoate. As the sol solution was acidified, the carboxylate grou…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
The use of decomposed methanol, i.e., hydrogen and carbon monoxide, in spark-ignition engines is reviewed. The emphasis is on onboard decomposition and the paper docs not deal with engines fueled by stored hydrogen. The paper concentrates mostly on the experimental work performed using catalytically decomposed methano…
Abstract Accumulation of the reactant supplied to a cooled semibatch reactor (SBR) will occur if the mass transfer rate across the interface is insufficient to keep pace with the supply rate. Then, due to a low starting temperature or supercooling, the reaction temperature does not rise fast enough to the desired valu…
Large-grain zinc oxide (ZnO) films have been deposited on glass substrates by DC magnetron sputtering in H 2 O-Ar mixtures at elevated substrate temperatures. The (002)-oriented columnar structure grown in pure Ar changed into the granular structure as the partial pressure of water vapor increased. Low-resistivity pyr…
Abstract 2 H NMR was used to investigate the effect of fillers on the molecular motions in mixtures of polydimethylsiloxane (PDMS) with different fillers. For active fillers with hydrophilic surface OH groups the molecular mobility at the polymer‐filler interface is strongly different from that outside the adsorption…
Tannic acid methods have been applied to capture the exocytosis of peptide-containing granules from peptidergic neurons. The captured exocytoses have been quantitated to assess the proportion and amount of peptide released at different parts of the neuronal membrane. Examination of hypothalamic synaptic boutons shows…
Biofunctionality and biocompatibility materials for bone, joint and cartilage replacement materials for use within the cardiovascular system materials and materials technologies for artificial organs materials for skin and nerve repair biologically active analogs of the extracellular matrix dental restorative material…
The orientational distribution function f relative to the director of elongated molecules of liquid crystals and related materials can be determined, in principle, from the intensity distribution I along equatorial arcs in the x-ray-diffraction pattern. The integral equation relating these two quantities is solved her…
The cubic ( c ‐ZrO 2 ) and tetragonal zirconia ( t ‐ZrO 2 ) phase stability regions in the system ZrO 2 –Y 2 O 3 –Ta 2 O 5 were delineated. The c ‐ZrO 2 solid solutions are formed with the fluorite structure. The t ‐ZrO 2 solid solutions having a c/a axial ratio (tetragonality) smaller than 1.0203 display high fractur…
Communication: The high substituent sensitivity of the electrical conductivity of copper DCNQI radical anion salts (see figure) is atributed to the fact that the stacks of copper atoms and bridging DCNQI ligands are covalently clamped together within the frame work of a sevenfold interpenetrating super diamond archite…
Peer reviewed: Yes
The motion of bubbles dispersed in a liquid when a small-amplitude oscillatory motion is imposed on the mixture is examined in the limit of small frequency and viscosity. Under these conditions, for bubbles with a stress-free surface, the motion can be described in terms of added mass and viscous force coefficients. F…
The electro-optic response of polymer dispersed liquid-crystal (PDLC) films is reported as a function of frequency and amplitude of the applied voltage and size of the LC droplets. We found that the threshold voltage is minimum and sharpest at frequencies near a few kHz. Visual and optical response studies show that t…
Abstract Mixed-layer clays of variable composition and structure occur in core samples from two drillholes (WK207 and WK210) drilled into the Te Mihi sector of the Wairakei geothermal field. These were identified by X-ray diffraction analysis of glycolated and oriented sample fractions at less than 2 μ m and less than…
The localization of the extracellular matrix glycoprotein laminin was studied using polyclonal anti-laminin antibodies. The laminin patterns of the basement membranes of the muscular epithelial sheath that envelops the ovariole were conspicuously different from those of the basement membrane of the follicular epitheli…
Anions as templates for “host” anions determine the shape of molecular cavities (cluster shells) which form from differently coupled tetragonal-pyramidal OVO4 building blocks. For example, in the case of the cluster anions [HV22O54(ClO4)]6− and [H2V18O44(N3)]5− (depicted on the right) the construction of the cluster s…