Materials Literature
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α-, β- und γ-Cyclodextrin sind aus sechs, sieben bzw. acht Glucoseeinheiten bestehende, ringförmige Oligosaccharide, die in großtechnischem Maßstab aus Stärke gewonnen werden können. Sie bilden Einschlußverbindungen mit kleineren Molekülen, die in ihren 5-8 Å weiten Hohlraum hineinpassen. Diese (kristallinen) Komplexe…
The kinetics of triple-helix formation in type III pN-collagen, type III collagen and a quarter fragment of type III collagen was followed by optical rotation and circular dichroism. Kinetic intermediates were detected by trypsin digestion and polyacrylamide gel electrophoresis. The end products of refolding at 25 deg…
Retention of known geometry, with regard to mean atomic positions, has proved useful in the refinement of macromolecules. In structures with a paucity of diffraction data and large displacements of the atoms from their mean positions, it is also of value to restrain the thermal factors to be consistent with known ster…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance spectroscopy of lanthanide complexes with a tetraacetic tetraaza macrocycle. Unusual conformation propertiesJ. F. DesreuxCite this: Inorg. Chem. 1980, 19, 5, 1319–1324Publication Date (Print):May 1, 1980Publication History Published online1 May 200…
SUMMARY The image contrast of extremely thin films of amorphous carbonaceous materials has been studied experimentally using thin supporting films of single crystal graphite. The use of thin specimens reduces the ‘overlap’ effect in imaging amorphous materials. Image contrast of their images was therefore interpreted…
By Shiing-Shen Chern: pp. 152. DM.24,—, US$13.20. (Springer-Verlag, 1979).
Abstract A model is presented for analysis of the sorption of mixed gases in glassy polymers at concentrations below which significant plasticization occurs. The well‐known dual‐mode sorption model comprised of a Henry's law term and a Langmuir isotherm term, which has been used extensively for interpretation of singl…
The initial stages of corrosion of iron by unstirred saturated aqueous solutions at 21°C and atmospheric pressure have been examined as a function of time, p H (from 2 to 7, adjusted by addition of or ), and applied current. Detailed examination of the morphology and phase identity of the corrosion products has led to…
The toughness of ceramics can be substantially enhanced by inducing a martensitic transformation in the stress field of the dominant crack. The specific characteristics of martensitic transformations pertinent to this toughening process are examined in this paper. A generalized model of the toughening is developed, wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe concept of Fermi level pinning at semiconductor/liquid junctions. Consequences for energy conversion efficiency and selection of useful solution redox couples in solar devicesAllen J. Bard, Andrew B. Bocarsly, Fu Ren F. Fan, Erick G. Walton, and Mark S. WrightonCite this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Polystyrenes of Extremely High Molecular WeightsBernd Appelt and Günther MeyerhoffCite this: Macromolecules 1980, 13, 3, 657–662Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.…
Elastic and vibrationally inelastic differential, integral and momentum-transfer cross sections for electrons scattered by CO 2 molecules are reported at 4, 10, 20 and 50 eV impact energies. The elastic cross sections are placed on an absolute scale by means of a relative flow technique. The inelastic cross sections a…
Dynamic models of crystal surfaces have provided new insights into the crystal growth process. The effects of surface roughening, dislocations, and impurities have been assessed. Certain impurities have been found to cause a larger increase in the growth rate than screw dislocations.
Abstract The refractory group VIA metals generally exhibit intergranular brittleness when they are in the recrystallized condition. This causes severe problems in their fabrication and places major limitations on their practical application. The phenomenon, generally referred to as recrystallization embrittlement, res…
ENDOR measurements at 25 K have been used to determine the hyperfine coupling tensors for all ten protons in the VO(H2O)5 2+ ion in single crystals of Mg(NH4)2(SO4)26H2O. The traceless components of all the tensors are close to axial and their use in a point dipole treatment enables a very plausible geometrical model…
The resistance of single crystals of NbSe 3 under pressure, between 1.2 and 70K has been measured in magnetic fields up to 180 kG. The CDW which appears at ambient pressures at 59K, is totally suppressed for pressures greater than 5.5 kbar. At this pressure NbSe 3 is fully superconducting as shown by a total Meissner…
The binding energies of all core levels in the M and N shells for the elements Zr to Te (except Tc) the M V level of Y have been measured by means of ESCA. The binding energies obtained are compared to previously reported values. The Tc binding energies are estimated through an interpolation between the neighbouring e…
The reversible phase transformation of potassium sulphate is studied. Differential thermal analysis, dilatometric and dielectric measurements show the occurrence of a reversible phase transition at 571 °C for K2SO4 with heat of transformation H = 2.3 kcal/mol and activation energy E = −215 kcal/mol. The thermal hyster…
A major problem in the nuclear industry is the dissolution of refractory plutonium dioxide. Of all of the metal oxides capable of producing reasonably concentrated solutions in dilute acids, plutonium dioxide is one of the most, if not the most, difficult to dissolve. The difficult task of dissolution of PuO 2 on a pr…
The reflectivity of a thin partially oxidized Cu film is measured as a function of the photon glancing angle around the critical angle of total reflection and as a function of energy around the K absorption edge of Cu. Above the edge fine structures are observed in the energy dependent spectra which are related to the…