Materials Literature
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The corrosion processes occurring in archaeological iron artifacts are discussed in the light of published measurements of electrode potentials and pH, and the relevance of this to the selection of conservation procedures is considered. In particular it is concluded that wet anaerobicstorage of ironwork should be succ…
<div class="htmlview paragraph">In die cast applications, high purity AZ91 alloy has been shown to result in parts with salt water corrosion performance that is 10 to 100 times better than the standard purity alloy. Two major concerns with regard to the continued development of the alloy have been resolved in th…
Abstract The instability of palygorskite and sepiolite under soil conditions was investigated to determine if these fibrous minerals transform directly to smectite under laboratory conditions. The treatment of 100 mg (0.12 mmole) of palygorskite with 1 mmole of NaOH solution (17 ml) at 150°C for 24 hr yielded a smecti…
Pseudomonas fluorescens PHK uses 4,5-dihydroxyphthalate as the sole carbon source for o-phthalate catabolism. This intermediate is the substrate for a decarboxylase of the pathway yielding protocatechuate. The decarboxylase was purified to homogeneity by an affinity chromatography procedure in which the reaction produ…
Partition ratios of zinc and lead between synthetic granitic melts and aqueous phase were determined at 800 degrees C and under P (sub H 2 O) = 3.5 + or - 0.25 kb. Two starting glasses in the system SiO 2 -Al 2 O 3 -CaO-Na 2 O were prepared. Their bulk chemical compositions are similar, i.e., SiO 2 content of 75.65 pe…
Tenside anion “doped”, highly conducting polypyrroles (PPY) have been grown electrochemical-ly from aqueous electrolytes. The influence of the electrolysis parameters on the conductivity have been investigated. The X-ray diffraction patterns allow to derive a structural model.
The effect of fluorine substitution into a mesogenic system depends critically on the manner in which it is introduced. The relative stabilities of smectic and nematic phases may be inverted by altering the site of substitution, and lateral fluorination is particularly interesting for the strong suppression of smectic…
Cellulose samples from cotton and wood pulps with varying low degrees of crystallinity (mechanically decrystallized) were studied. The influence of initial cellulose crystallinity on sugar yield after enzymatic hydrolysis was determined by two different methods. As expected, samples with low crystallinity were much mo…
Comparison between the deformation structures of aluminium appearing as striations on the surface of specimens and the dislocation structures is not straightforward. The influence of grain boundaries on deformation structures in particular is difficult to interpret, and the effects seen at boundaries have not been ful…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of telechelic living poly(vinyl ethers)Masaaki Miyamoto, Mitsuo Sawamoto, and Toshinobu HigashimuraCite this: Macromolecules 1985, 18, 2, 123–127Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue 1 February 1985…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectrochemical properties of bis(2,2'-bipyridine)(4,4'-dicarboxy-2,2'-bipyridine)ruthenium(II) chlorideTakeo Shimidzu, Tomokazu Iyoda, and Kansei IzakiCite this: J. Phys. Chem. 1985, 89, 4, 642–645Publication Date (Print):February 1, 1985Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent metal ion catalysis in the hydrolysis of esters of picolinic acid. Metal ion promoted hydroxide ion and water catalyzed reactionsThomas H. Fife and Theodore J. PrzystasCite this: J. Am. Chem. Soc. 1985, 107, 4, 1041–1047Publication Date (Print):February 1, 1985Publi…
The water content of 12 paints on steel substrate, exposed to 0.1 M sodium chloride at 25 C for 24 h, was calculated from impedance measurements and compared with gravimetric determinations. Brasher’s empirical expression was compared with five mixture formulas derived from the theory of dielectric properties of heter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of blocked and ligand-appended hemes derived from atropisomeric meso-diphenylporphyrinsRichard Young and Chris K. ChangCite this: J. Am. Chem. Soc. 1985, 107, 4, 898–909Publication Date (Print):February 1, 1985Publication History Published onli…
The electrical conductivity of solvent and electrolyte-wetted poly(pyrrole) films is measured, both statically and dynamically, as a function of the potential applied to an electrode in contact with the film. The applied potential determines the film oxidation state. Poly(pyrrole) electrical conductivity is ohmic and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of borate complexation in assigning relative stereochemistry of acyclic polyhydroxylated compoundsRichard E. Moore, Joseph J. Barchi Jr., and Giovanni BartolinCite this: J. Org. Chem. 1985, 50, 3, 374–379Publication Date (Print):February 1, 1985Publication History Publis…
The components of the elastic constant matrix of monoclinic caesium dihydrogen phosphate (CDP) have been determined using ultrasonic velocity measurements to be Cl1 = 28· 83 ± 0 '43, C22 = 26·67 ± O· 37, C33 = 65 ·45 ± 0'48, C44 = 8 .1O± 0,15, Css = 5 ·20± 0,24, C66 = 9·17 ± 0,22, C12 = 1l'4±3'6, C13 = 42·87±1·58, CIS…
Abstract From hydrothermal experiments three pressure-temperature-time curves have been refined for the system Al 2 O 3 −SiO 2 −H 2 O and reversal temperatures established for two of the principal reactions involving kaolinite. The temperatures of three isobaric invariant points enable the Gibbs free energy of formati…
In thermal relaxation calorimetry, the heat capacity can be calculated from the time constant τ1=Cp/Kb of the exponential decay of the cooling curve. If the thermal bond between the sample and sample holder is poor, the cooling curve is described by T−T0=A1 exp(−t/τ1)+A2 exp(−t/τ2). Analysis shows that the heat capaci…
High pressure DTA experiments show that the dehydroxylation of kaolinite in dry runs with P(Total) : P(argon) proceeds at 525c and I bar to 627c at 30.5 bars. Further increase in pressure slowly increases the dehydroxylation temperature, at 5270 bars it occurs at 670'C. Under conditions of P(Total) : p1rOr, dehydroxyl…