Materials Literature
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Critical-point drying of microorganisms for scanning electron microscopy can be rapidly and effectively accomplished by use of a newly described specimen holder. Up to eight different samples of spores or vegetative cells are placed between polycarbonate membrane filters in the holder and processed through solvent deh…
We investigate here the threshold behaviour of Williams domains and of the dielectric alignment in homeotropic and parallel oriented nematic films for different signs and magnitudes of the dielectric anisotropy. The theoretical predictions of the Helfrich theory are in agreement with the experiment.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation and Prediction of Excess Thermodynamic Functions of Strongly Nonideal Liquid MixturesIsamu Nagata and Toshiro YamadaCite this: Ind. Eng. Chem. Process Des. Dev. 1974, 13, 1, 47–53Publication Date (Print):January 1, 1974Publication History Published online1 May 20…
Abstract Macronet isoporous polystyrene structures are obtained by cross‐linking of dissolved polystyrene by means of bischloromethylated benzene or biphenyl. Macronet isoporous cation exchangers, irrespective of the type and amount of cross‐linking agents, can be completely saturated with the tetrabutylammonium ions.…
Nitric oxide and carbon monoxide have been used to poison a propene disproportionation catalyst prepared from molybdenum hexacarbonyl on silica. Nitric oxide is strongly adsorbed, and an effective poison, but infra-red spectra indicate that adsorption occurs on more than one type of site, so that estimates of the acti…
There has been much research and speculation recently on the nature of radiation induced defects in zirconium and its alloys, and in particular on the absence of voids at high fluences and temperatures in the range 0.3 to 0.5 T m (T m is the absolute melting temperature). Wolfenden and Farrell1 have reviewed the evide…
Abstract After a brief historical introduction the influence of curatives on the chemical structure of vulcanizates is discussed. Emphasis is given to physically important features of network structure such as crosslink density, crosslink type, and various main‐chain modifications. The significance of extra‐network ma…
The deleterious consequences of hydrogen on an engineering structure come about through an influence on either the crack initiation or the slow crack growth stage of fracture. Whether or not these two stages of fracture are affected by hydrogen will depend on a number of primary and secondary influences which severely…
The apatites are an important group of minerals ; isotypes have been synthesized that include substitutions for Ca, P and F. For Ca are included : Sr, Pb, Ba, Cd, Sn", Eu" and Mn", as well as various combinations with Na, K, Al and RE. For P are included : V, As, B, Ge, Si, S, Se, Cr, and Al, as well as CO₃ groups for…
X-Ray analysis shows that in the porphyrin monocation one pyrrole ring, probably protonated, is tilted 14° from the plane through the other three pyrrole rings by the repulsions between the inner three hydrogen atoms.
An investigation was made of the anisotropic electrical conductivity (σ‖ and σ⊥) of MBBA (p-methoxybenzylidene-p-n-butylaniline) containing tetrabutylammonium tetraphenyl-boride (henceforth denoted as AB where A+ is the tetrabutylammonium cation and B− is the tetraphenylboride anion). Alignment parallel and perpendicu…
trans-[ PtX4L2](L = PMe3, AsMe3, or SMe2; X = Cl or Br) and, except X = Br for SMe2, cis-complexes have been isolated, together with the salts Prn4N[PtX5L], Prn4N[PtI5PMe3], Prn4N[PtCl5NMe3], and [PtCl3(PMe3)3] BF4. The vibrational spectra of the complexes have been studied. 1H N.m.r. measurements have been made for t…
In binary systems, consisting of two structually similar components of which one is a liquid crystal, extrapolation of the transition curves should yield values for latent transition temperatures of the non-liquid crystalline substances. The reliability of this method of arriving at the latent transition temperatures…
The mechanism of formation of green rusts, Fe3O4, α-FeOOH, γ-FeOOH, δ-FeOOH and amorphous ferric oxyhydroxide, which are important atmospheric corrosion products of iron and steels, in aqueous solution at room temperature, has been investigated. The formation processes on which end products are determined are strongly…
Comparative evaluations of the wear resistance of isotropic pyrolytic carbons deposited in fluidized beds (Pyrolite carbons) were carried out at room temperature in distilled water. The test procedure employed a polished, rotating disk bearing on a polished flat specimen. Couples of pure and silicon-alloyed Pyrolite c…
Abstract The binding energies of N(1s) in ethylenediaminetetraacetic acid (EDTA) and its related compounds were measured by means of a photoelectron spectrometer, and the molecular structures of EDTA were discussed. Two kinds of peaks were observed in the N(1s) spectra of EDTA and its related compounds, with binding e…
The energies of interaction of the molecules CH4, C2H6, C3H8, n-C4H10, n-C5H12 and n-C6H14 with the surface of graphite lattice have been calculated employing a Monte Carlo method. The present calculations are based on the assumption that the interaction energy is expressible as a sum of the pair interactions between…
The rapture appearances and pressures are compared for clamped disks, biaxially stressed to rupture under upward increasing pressures of helium or of an embrittling fluid such as gaseous hydrogen isotopes. Usually the downward surface is available for observation during the test in progress, but it can be exposed to a…
The Sediment of Lake Kummerow. Investigations on the Chemism and the Diatom Flora The paper deals with the distribution of chemical parameters and of diatoms in the deposits of the eutrophic Lake Kummerow (GDR), produced during about the last 3500 years. The sediment consists of a calcareous gyttja with a very low con…
The structure factor of supercooled liquid gallium and mercury has been measured as a function of temperature with $\mathrm{Cu}\ensuremath{-}K\ensuremath{\alpha}$ x radiation. The use of samples consisting of a planar array of a large number of small droplets of about 10-\ensuremath{\mu}m diameter allowed supercooling…