Materials Literature
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The thermoelectric power of glassy carbon, heat-treated for three hours between 1200 and 2700°C, has been measured at temperatures from 1·5 to 280 K. The dependence of thermoelectric power S on temperature T can empirically be written as S = aT + bT ½ + S B, where the first term is a strong-scattering metallic compone…
Abstract Die kurzzeitige Behanlung ( t ≦ 300 s) von Polyethylen‐ und Polypropylenfolien im nichtthermischen Plasma von O 2 ‐ und NH 3 ‐Hochfrequenz‐Glimmentladungen und die damit verbundene Schaffung von funktionellen Gruppen an der Polymeroberfläche führte zu erheblichen Verbesserungen der Adhäsion von aufgedampften…
Annth power generalization of Longo's roll-off curve equation is proposed. A method for finding the exponentnfrom an experimental curve is given. Eng's model corresponds approximately ton = 5, Good electron guns havenvalues in the 6 to 10 range. The use of n as a figure of merit for quality control is discussed. The c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of argon-ion bombardment on the basal plane surface of molybdenum disulfideJeffrey R. Lince, David J. Carre, and Paul D. FleischauerCite this: Langmuir 1986, 2, 6, 805–808Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published…
Changes in the microfissuring susceptibility of alloy 718 due to solution annealing and age hardening are studied. The effects of Ni3Nb (delta) precipitation during solution annealing and gamma-prime + gamma-double-prime precipitation during age hardening on microfissuring are investigated. It is observed that solutio…
Conductivity investigations have been performed at highly pure zinc oxide films under equilibrium conditions in the temperature range from 300 to 1000 K in oxygen (1 to 150 mbar). The conductivity behavior has to be divided into two temperature ranges. Above 800 K, the slope of vs. corresponds to 1.6 eV and the oxygen…
Abstract It is important to assess the effects of ionic strength and type of anion when studying adsorption of metals on soils and soil components because the background salt may complex metals and compete for adsorption sites. Four experiments were carried out to determine the effect of ionic strength and anions on Z…
Abstract Blends of polypropylene with ethylene‐propylene copolymers of various compositions have been studied by small angle neutron scattering with regard to their compatibility at room temperature and in the melt. It has long been known that such blends separate into distinct phases at lower temperatures due to the…
Abstract Boron adsorption behavior on the clay minerals kaolinite, montmorillonite, and illite was investigated. Adsorption increased at low pH, exhibited a peak in the pH range 8 to 10, and decreased at high pH. It was assumed that B adsorbs by means of a ligand exchange mechanism with aluminol groups at the edges of…
Analytical expressions for the elastic constants of nematic polymer solutions are derived when the macromolecules are monodisperse rod-like, bidisperse rodlike or semi-flexible. These expressions are derived in the gaussian approximation so that they constitute exact leading terms of a general asymptotic expansion for…
Results of the Morrison analysis applied to the curved Arrhenius plots of self-diffusion in copper, silver, gold, nickel and platinum are reported. Both temperature-dependent and temperature-independent energies and entropies are taken into consideration. The analysis is applied to the most reliable diffusion coeffici…
It has been shown that the lyotropic liquid-crystalline phases formed by certain dyes are structurally analogous to the chromonic N and M liquid-crystalline phases previously thought to be unique to certain anti-asthmatic/anti-allergic drugs. We suspect that these two groups of compounds will prove to be representativ…
It seems certain now that cholesteric liquid crystals (cholesterics, or CLC, for short) have been the first examples of mesomorphic state of matter known to humankind. Apart from the well-known discovery of the two-stage melting of cholesteryl benzoate made by Reinitzer in 18881 and cited in almost all the textbooks,…
Close-contact melting was investigated by performing a series of experiments in which blocks of solid n-octadecane (with circular or rectangular cross section) were melted by a horizontal planar heat source at constant surface temperature. Close contact between the source and the solid prevailed throughout the experim…
The cubic-crystalline field-splitting parameter a of ${\mathrm{Fe}}^{3+}$ at a Ti site in ${\mathrm{BaTiO}}_{3}$ has been measured with EPR in the cubic phase as a function of pressure p and temperature T. From these measurements, the relative explicit volume and temperature dependences of a(p,T) have been obtained. T…
Abstract Differential Scanning Calorimetry (DSC) is used to study the curing behavior of epoxy systems. For non‐catalyzed diamine‐epoxy systems, the reaction enthalpy ΔH and the glass transition temperature T g are evaluated and related to the structure of the hardener. A method is developed to determine the activatio…
A large number of species originally assigned to Synedra have been investigated mainly by scanning electron microscopy. Most are marine or brackish in distribution and structurally they differ considerably from Synedra as defined from the freshwater species and hence we have been able to recognise five new generic tax…
By using x-ray diffractometry and 13C-NMR spectroscopy, in combination with chemical and heat pretreatments, we have found good evidence for the occurrence of interlayer clay-organic complexes in two New Zealand soils. Here, the clay mineral is a regularly interstratified mica-smectite, and the organic species is a hu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the structure of the quenched mesomorphic phase of isotactic polypropyleneP. Corradini, V. Petraccone, C. De Rosa, and G. GuerraCite this: Macromolecules 1986, 19, 11, 2699–2703Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Publishe…
A model of combined heat and water vapor transport in multi-layered clothing is presented. Transport of heat by conduction and radiation and vapor transport by diffusion are included; heat and mass transport by forced convection are not. The calculations are performed in a time-dependent mode and compared to experimen…