Materials Literature
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The polymer crystal lamellar growth rate G is an often-measured property of semicrystalline polymers. In this paper, we investigate the dependence of G upon the length of the substrate, L, the surface nucleation rate of new growth layers per unit length per unit time, i, the velocity with which the growth layer covers…
Analytic features of the spectra due to excitation of a core electron in metal with an incomplete shell are studied with a simple model. The incomplete shell (denoted by d state, representatively) is treated as a nondegenerate localized state interacting with conduction band through the s – d mixing. It is assumed tha…
A fracture mechanics approach was used to investigate the high strength of hot‐pressed Si 3 N 4 . Room‐temperature flexural strengths, fracture energies, and elastic moduli were determined for material fabricated from α‐ and β‐phase Si 3 N 4 powders. When the proper powder preparation technique was used, α‐phase powde…
Paint has long been used for the protection of iron and steel against corrosion.
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…
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…
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 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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…
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…