Materials Literature
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New methods of sterilization employing a chemical with moderate heat and ultrasonic energy have been devised. Inactivation of high-density bacterial spore suspensions is achieved by treatment with low concentration aqueous acid glutaraldehyde solutions at temperatures above or about 54 C. Low (20 kHz) or high (250 kHz…
Quantitative diagrams of the fringed micellar model have been produced for tire cord, Fortisan, wood cellulose, cotton, ramie and bacterial cellulose, based on the results of the reactivities of these celluloses towards deuterium oxide and acid hydrolysis. The hypothesis has been used that rapid acid hydrolysis occurs…
Abstract Crystals of the 2 : 3 complex of zinc-phthalocyanine and normal hexylamine were studied. They are monoclinic, space group P21⁄c, with cell dimensions a=12.40, b=15.76, c=20.05, β=93.2° and there are four phthalocyanine and six hexylamine molecules per cell. The phthalocyanine molecule is not planar and the ce…
Detailed measurements of the electrical resistance of a pure chromium single crystal, $\frac{{R}_{300}}{{R}_{4.2}}=350$, have been made over the temperature range 77-325 \ifmmode^\circ\else\textdegree\fi{} K for both the single-domain $\stackrel{\ensuremath{\rightarrow}}{\mathrm{J}}\ensuremath{\parallel}\stackrel{\ens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-spin coupling between copper(II) ions bridged by pyrazine ligandsWilliam E. Hatfield and Juan F. VillaCite this: J. Am. Chem. Soc. 1971, 93, 16, 4081–4082Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971…
Abstract The effect of molecular organization (crystallinity, orientation) on the internal friction of poly(ethylene terephthalate) was studied by means of dynamic mechanical measurements at temperatures from 300 to 4.2°K, with a free‐oscillating torsion pendulum at 1 Hz. It was found that crystallinity decreases the…
The methods of normal probability plot analysis have been applied to two nearly complete sets of structure factors ( F meas ) and the corresponding objectively assigned standard deviations (σ F meas ) obtained by diffractometer measurement with two different crystals of lutetium orthoborate. The least-squares derived…
The Th–Co and Th–Fe systems were studied by x-ray diffraction methods. Five intermetallic compounds were observed in each system. For each of these compounds the lattice parameters were determined. The magnetic properties of the various compounds were investigated at temperatures between 4.2 and 1200 K with magnetic f…
Abstract A new method of obtaining films of aromatic heterocyclic ladder polymers has been found which circumvents casting from high‐boiling acidic solvents. The BBL ladder polymer has been formed into tough, durable films by collecting suspensions of the polymer obtained from acid reprecipitations upon a fritted glas…
A method to prepare thin films of MnBi by vapor deposition followed by a fast annealing process is described. Uniform and reproducible MnBi films suitable for magneto-optic applications can be obtained using this technique. Upon quenching from above 360°C, the high-temperature phase can be preserved at room temperatur…
A previous paper by Edwards & Toman on the subject of the variance non-additivity and curvature corrections is revised and extended. The formula for the curvature correction is given in a form which facilitates evaluation for cases of crystallite size broadening by crystallites of known shape; the formula involves…
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
The effect of carbonate ions on the anodic behavior of a horizontal zinc anode in concentrated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:mo>KOH</mml:mo> </mml:math> solutions has been investigated by measuring the passivation time at constant current. An…
Transient-temperature burst tests were performed on both unirradiated tubing and irradiated fuel rods of Zircaloy at a variety of heating rates and internal pressures. Base-line tests, performed on unirradiated boiling-water reactor size tubing over a range of initial pressures at 600°F from 50 to 1000 psig and heatin…
Photoelectron and Auger-electron spectra are both obtained with x-ray excitation. Using the photoelectron spectra as internal energy standards, the energies of the prominent LMM Auger lines in Cu, Ni, and Fe have been accurately determined. In addition, the photoelectron spectra provide a measure of the vacancy distri…
Paramagnetic resonance is detected for $^{172}\mathrm{Yb}^{3+}$ ions diluted in crystals of Y${({\mathrm{C}}_{2}{\mathrm{H}}_{5}\mathrm{S}{\mathrm{O}}_{4})}_{3}$ \ifmmode\cdot\else\textperiodcentered\fi{} 9${\mathrm{H}}_{2}$O at temperatures $1.2\ensuremath{\leqq}T\ensuremath{\leqq}4.2$ \ifmmode^\circ\else\textdegree\…
The effect of impurities on the color of dense flint glass was investigated by comparing the optical absorption caused by cations in Na 2 O·3SiO 2 ·2PbO glass, in Na 2 O·3SiO 2 ·2PbO:1 wt% Sb 2 O 3 glass, and in Na 2 O·3SiO 2 glass; all three are colorless when of high purity. Of 11 colorants, only vanadium colored bo…
Abstract Several new amide—imide polymers of good thermal stability have been synthesized by the reaction in solution of diacid chlorides with diamines containing cyclic imide linkages. Since these polymers incorporate preformed imide groups, they are not subject to some of the problems encountered in the preparation…
The thermoelectric power and temperature coefficient of resistance of gold films has been measured and related to the energy dependence of both the mean free path of conduction electrons and the area of the Fermi surface. Values obtained for the quantities (dlnλ/dlnW)W=WF and (dlnA/dlnW)W=WF are − 0.60±0.04 and − 0.85…
The brackish-water diatom Cyclotella cryptica is a polymorphic species. Nine clones are capable of producing the valve pattern characteristic of the species C. meneghiniana, as well as the C. cryptica pattern. A study of the effects of salinity and freshwater conditions on the morphology of the valve shows that the cr…