THE MECHANISM OF THE PROTECTION OF IRON AND STEEL BY PAINT
Paint has long been used for the protection of iron and steel against corrosion.
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Segregation and Exchange Properties of Alkylammonium Ions in a Smectite and Vermiculite
Abstract X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers. Vermiculite, however, showed segregation into crystallites, a behavior attributed to clay inhomogeneity. Ion segregation is explained by the hydration properties of…
Raman spectra of thorium(IV) fluoride complex ions in fluoride melts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectra of thorium(IV) fluoride complex ions in fluoride meltsL. M. Toth and G. E. BoydCite this: J. Phys. Chem. 1973, 77, 22, 2654–2657Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.ac…
The Influence of the Christiansen Effect on I.R. Spectra of Powders
Abstract The Christiansen effect appears in the i.r. spectrum of powders embedded in a solid, liquid or air matrix as an apparently anomalous transmittance (Christiansen peak) of the incident electromagnetic radiations. The peak appears at wavelengths for which the refractive index of the sample and the refractive ind…
The Relationship Between Galvanic Current and Dissolution Rates
The recent development of instrumentation suitable for accurate determination of galvanic currents suggests that more data of this nature will be gathered and reported. It is shown that galvanic current data cannot be an accurate measure of dissolution rates in many cases, since dissolution rates from the galvanic cur…
Hot‐exciton luminescence in CdSe crystals
Abstract The emission spectra of CdSe crystals under the excitation in the region of fundamental absorption with the HeNe laser line λ = 6328 Å have been studied at temperatures 4.2 to 300 °K. A set of narrow emission lines shifted by the energies of an integer number of LO phonons to lower energies from the exciting…
Theory and observations of polymer crystal thickening
The thickening of polymer crystals during isothermal annealing is usually observed to be an irreversible process. Phenomenological laws that govern such processes take the form of simple proportionalities—flux being proportional to force. For polymer crystals, a thermodynamic force capable of driving the thickening ph…
Calorimetric Study of the Glassy State. VIII. Heat Capacity and Relaxational Phenomena of Isopropylbenzene
Abstract The heat capacities of isopropylbenzene were measured with an adiabatic calorimeter for the crystal from 14 to 177.13 K (Tm), for the glassy state from 14 to around 126 K (glass transition temperature: Tg) and for the liquid from Tg to 313 K, with a sample of 99.93% purity. The heat and entropy of fusion were…
Theory of Spin-Dependent Phonon Raman Scattering in Magnetic Crystals
A general theory of the spin-dependent phonon Raman scattering in magnetic crystals is developed. The integrated Raman intensity as a function of temperature is expressed as S ( T )=( n 0 +1)| R + M < S 0 · S 1 >| 2 , where the first term represents the spin-independent part and the second one the spin-dependent part…
The stable regulator problem and its inverse
This paper provides a detailed survey and extension of certain properties of the stable regulator problem: determine\min\inf{u} \int\min{0}\max{\infty} x'Qx + u'u dtsubject to\dot{x} = Fx + Gu; x(0) = x_{0}; \liminf{t \rightarrow \infty} x(t) = 0whereQis not necessarily sign definite. First, equivalence conditions rec…
Glass transition of polyethylene: Volume relaxation
Data are presented to show that when linear polyethylene is quenched from room temperature to temperatures below 273 K, it exhibits a volume decrease for times long compared with that required to establish temperature equilibrium. The time, temperature, and density dependence of this decrease is shown to be consistent…
Polymer compatibility
Abstract Bohn has compiled a list of polymer pairs on which compatibility studies have been reported. The list contains 13 polymer pairs for which, according to Bohn, compatibility as solids may be considered to be definitely established, at least within some regions of proportions. The approach used here is based on…
Core electron binding energy study of group IIb-VIIa compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCore electron binding energy study of group IIb-VIIa compoundsR. D. Seals, Robert Alexander, Larry T. Taylor, and John G. DillardCite this: Inorg. Chem. 1973, 12, 10, 2485–2487Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published ini…
Beeinflussung der kristallstruktur von isotaktischem polypropylen durch kristallisation aus orientierten schmelzen
Abstract Bei der Kristallisation orientierter Schmelzen aus isotaktischem Polypropylen erhält man Bandsphärolithe, die überwiegend aus ß‐Modifikation bestehen, wenn die Kristallisationstemperatur im Bereich von 100 bis 130°C liegt. Dabei ist es gleichgültig, auf welche Weise die Orientierung erzeugt wird. Der Anteil d…
Modified approach to capillary hysteresis based on a similarity hypothesis
We present herein a simplified approach to the capillary hysteresis phenomenon. This approach is based on a similarity hypothesis resembling that of Philip (1964), but different basic assumptions lead to a quite simple and handy method of predicting the relationships between the capillary head and the water content wi…
Chemical reaction coordinates from crystal structure data. I.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical reaction coordinates from crystal structure data. I.H. B. BuergiCite this: Inorg. Chem. 1973, 12, 10, 2321–2325Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inissue 1 October 1973https://pubs.acs.org/doi/10.1021/ic50…
A powder-diagram automatic-indexing routine
The program presented here performs an automatic indexing of powder patterns by means of a trial-and-error method. It has been optimized and presents a good flexibility. It can account for various additional information, known a priori. In addition, extensive error computations are included in it, leading to a good re…
Metal complexes of 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane, N-tetramethylcyclam
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal complexes of 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane, N-tetramethylcyclamE. Kent Barefield and Frank WagnerCite this: Inorg. Chem. 1973, 12, 10, 2435–2439Publication Date (Print):October 1, 1973Publication History Published online1 May 2002Published inis…
Nylon 6 fibers: Changes in structure between moderate and high draw ratios
The in-phase modulus and coefficient of diffusion of nylon 6 fibers are analyzed in terms of wide-and small-angle X-ray diffraction data. Both properties are examined in directions parallel and perpendicular to the fiber axis. The anisotropy in diffusion and mechanical coupling between the crystalline and amorphous ph…
Frank Elastic Constants of the Hard-Rod Liquid Crystal
The elastic constants of a hard-rod liquid crystal are calculated using the Onsager theory, with results similar to those given by Priest.Received 30 April 1973DOI:https://doi.org/10.1103/PhysRevA.8.2181©1973 American Physical Society