Materials Literature
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A novel procedure for the removal of carbonaceous deposits from zeolites using ozone-enriched oxygen is described. Pentasil zeolites (SiO2/Al2O3 mole ratios 35, 70) were studied and deactivated using methanol conversion to hydrocarbons and o-xylene isomerisation. Low temperature ozone reactivation was found to restore…
p-Benzoquinone derivatives fused with sulphur-containing heterocycles are strong electron acceptors and some of their charge transfer complexes with electron donors show high electrical conductivities.
A homologous series of α,ω-bis-[p-(4-alkoxyphenoxycarbony)Phenoxy] alkanes was prepared; their thermal and liquid crystalline properties were studied by differential scanning calorimetry and on the hotstage of a polarizing microscope. The nature of the liquid crystalline phase of the compounds depended greatly on the…
The ignition of metals and alloys have been investigated by rotating the end of a hollow cylinder against an identical stationery cylinder on a common axis (frictional heating) in gaseous oxygen. A ranking criterion that measures the resistance of metals and alloys to ignition is discussed. It consists of the power pe…
The possibilities for the use of fine structural methods in environmental toxicology are briefly summarized with special respect to fine structural consequences of toxic cellular injury and cell death.
Abstract In the system CuO – SeO 2 – H 2 O three new copper(II)-selenites were synthesized under hydrothermal conditions. The crystal structures were determined by single crystal X-ray techniques: Cu(SeO 3 )-II [ a = 5.962(1) Å, b = 7.010(1) Å, c = 12.240(1) Å, space group Pcab , Z = 8, R w = 0.020], Cu(SeO 3 )-III […
Solution properties of three manganese porphyrins, in monomeric form, were investigated. These were the 'picket-fence-like' porphyrin Mn(III)-alpha,alpha,alpha,beta- tetra-ortho(N-methylisonicotinamidophenyl)porphyrin (Mn(III)PFP) and two 'planar unhindered' porphyrins, the Mn(III)TMPyP (tetrakis (4-N-methylpyridyl)po…
Abstract not Available.
of its plateau-
Abstract Five vinylcatechol precursors have been synthesized by either alcohol dehydration or Wittig coupling techniques. Dehydration of the appropriate sec ‐phenethyl alcohol is the most efficient synthetic approach: the following monomers (yields) are reported: 5‐vinyl‐1,3‐benzodioxole, I (63%); 3,4‐dimethoxystyrene…
Accurate, O(5%) measurements of total-atom differential coherent-scattering cross sections of Sn and Pb within the range of scattering angles 10?(de60\ifmmode^\circ\else\textdegree\fi{} have been performed using 279.2and Comparison, with the predictions of Kissel, Pratt, and Roy and the various form-factor formulation…
In order to understand the hydrogen permeation phenomena in multiple metal layers, the time dependent permeation rates for duplex membranes of Cu–Ni and Cu–Fe have been systematically measured under hydrogen pressures from 103 to 105 Pa at temperatures from 500 to 1000 K, and the obtained results are compared with the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocontrol of polypeptide membrane functions by cis-trans isomerization in side-chain azobenzene groupsTakatoshi Kinoshita, Morimasa Sato, Akira Takizawa, and Yoshiharu TsujitaCite this: Macromolecules 1986, 19, 1, 51–55Publication Date (Print):January 1, 1986Publication H…
Abstract Poly(4‐vinylbenzaldehyde)s ( 4 ) of known chain lengths and of narrow molecular weight distributions (M̄ w /M̄ n ≈ 1,1) were synthesized by means of anionic living polymerization of 1,3‐dimethyl‐2‐(4‐vinylphenyl)imidazolidine ( 1 ) with oligo[α‐methylstyryl]potassium ( 2 ) and subsequent acid hydrolysis to re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroheterogeneous photooxidationD. C. Neckers and Jerzy. PaczkowskiCite this: J. Am. Chem. Soc. 1986, 108, 2, 291–292Publication Date (Print):January 1, 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10.1021/ja0026…
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Abstract A combined 13 C and 1 H NMR study on borate esters of a series of polyhydroxycarboxylates is presented. 13 C substituent effects upon borate ester formation, as obtained from a set of model compounds, established that borate esters of the threo ‐3,4‐diol functions of gluconate, glucarate, idarate and probably…
The thermal decomposition of solid sodium bicarbonate has been studied in the temperature range 360–500 K over a range of partial pressures of carbon dioxide. The effect of water vapour has also been studied. Above 440 K the reaction follows contracting-cube kinetics with an activation energy of 32 kJ mol–1 and a freq…
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Epiphytic diatoms on the natural seaweeds (seven brown-algae, two red-algae and one green alga) were fractionated by the five step separating treatments of shaking and rubbing. The order of adhesive strength of diatom species was determined from the recovery patterns of each diatom obtained through the five step separ…