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Abstract This paper is the first in a series intended to clarify the particle nucleation mechanisms in emulsion polymerization. The theory for particle nucleation by precipitation of oligomeric radicals from the water phase is discussed and a model based on the diffusion, propagation and termination steps is presented…
High-precision X-ray measurements on crystals of the layered dichalcogenide β-MoTe2 have revealed a structural transition at approximately 250 K. The transition from the monoclinic room-temperature form is accompanied by a discontinuous change of the monoclinic angle β from 93°55′ to 90°, with substantial thermal hyst…
Molecular dynamics simulation techniques have been used to study the equilibrium configurational properties of freely moving polymer chains constructed from linked elastic spheres. The mean square end-to-end distance and radius of gyration are found to vary exponentially with chain length, and the results are similar…
The theory of swelling is reviewed in terms of basic concepts and simulation and impurity effects. The basic theory employs the formalism of chemical reaction rates. Efficiencies of voids, dislocations, and other extended defects for absorption of vacancies and interstitials have been derived. Phenomena such as void c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe influence of axial ligands on metalloporphyrin visible absorption spectra. Complexes of tetraphenylporphinatozincMario Nappa and Joan S. ValentineCite this: J. Am. Chem. Soc. 1978, 100, 16, 5075–5080Publication Date (Print):August 1, 1978Publication History Published onl…
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
A detailed investigation of the steady-state and nonsteady-state reaction CO+1/2O2→CO2 on Pd (111) has been carried out with the molecular beam technique. It could be shown conclusively that the reaction proceeds between two adsorbed species (Langmuir–Hinshelwood mechanism) throughout the temperature and pressure rang…
The role of electron spin resonance in the study of both natural and synthetic diamond is reviewed. A brief survey of the physical significance of the constants in the spin Hamiltonian, as well as experimental technique, is given. The various nitrogen centres are discussed treating exchange-interaction, Jahn-Teller an…
A model building and refinement system is described for use with a Vector General 3400 display. The system allows the user to build models using guide atoms and angles to arrive at the final conformation. It has been used to assist in difference Fourier map interpretation at medium and high resolution, and to build a…
Authors have investigated electrolytically deposited massive MnO2. Its main constituent is ε-MnO2, with the hexagonal unit cell a0 = 2,80 Å and c0 = 4,45 Å. Positions and intensities of arcs on the fiber- and powder patterns are in accordance with the structure as described in the literature, viz. a hexagonal close pa…
Abstract The effects of casting solvents, dissolution temperature of casting solution, and pH and temperature of gelation solution, etc. on the permeation characteristics of cellulose acetate membranes in the separation of polymers from their aqueous solutions were investigated, using aqueous solutions of poly(ethylen…
Band structure calculations are presented for 4Hb-TaS 2 . The alternating trigonal prismatic and quasi-octahedral sandwiches are shown to contribute their own approximately two-dimensional bands with some hybridisation where they overlap. The associated Fermi surfaces are presented and used to interpret the high-tempe…
An excluded volume model is proposed for the cation-anion interaction in superionic conductors. The resulting cation-anion correlations are in excellent quantitative agreement with the pair distribution function derived from EXAFS measurements on AgI in both the normal beta and superionic alpha phases. Further, from t…
Evidence is presented for the existence of a tricritical point at the ferroelectric-paraelectric transition of PbZr x Ti 1-x O 3 close to a value of x=0.94. Details are given of measurements of dielectric constant, remanent polarisation and spontaneous strain. It is also observed that in single crystals of PbZr x Ti 1…
Abstract Die Lumineszenz von 3 Gruppen von hexagonalen Aluminaten, den Magnetoplumbiten: Ca‐, Sr‐ und CaMg‐aluminat: Ce, den Verbindungen vom β‐Al 2 O 3 ‐Typ: Ba‐ und BaMg‐aluminat: Ce und den verzerrten Magnetoplumbiten: Laund LaMg‐aluminat: Ce sowie Ce‐ und CeMg‐aluminat, wird im Zusammenhang mit der Kristallstruktu…
Using the singular point detection technique measurements are made of the temperature dependence of the first and second anisotropy constants of the pseudobinary alloy series Y2(CoxFe1−x)17 where x = 0.5, 0.6, 0.7, 0.8, and 0.9. The temperature range used is 4.2 to 300 K. For all temperatures the first anisotropy cons…
Nd-phospate glasses with a great laser effect are described. They have large induced-emission cross sections and low thermal distortion. Those glasses can be used in small and medium laser equipment for processing of materials and for measuring techniques. Addition of fluorine (fluorophosphate glasses) produces a lowe…
Polarized vibrational resonance Raman spectra have been measured for eight hexahalide complexes of transition metals, low-spin d4 OsCl62−, OsBr62−, and low-spin d5 IrCl62−, IrBr62−, and low-spin d6 PdCl62−, PtCl62−, PtBr62−, and PtI62−. Polarization anomaly due to asymmetric Raman tensor was found for the d5 complexes…
The infrared absorption spectra of PuO and PuO2 in both Ar and Kr matrices have been identified. The observed frequencies at 794.25 and 786.80 cm−1 have been assigned to the ν3 stretching modes of Pu16O2 in Ar and Kr matrices, respectively. Normal coordinate analysis of the PuO2 isotopomers, Pu16O2, Pu16O18O, and Pu18…
The generalized Smoluchowski equation is used in a projection operator formalism to find an equation for the intermediate scattering function. Several different approximations are made to investigate the behavior of the intermediate scattering function for intermediate and long times. The generalized Stokes–Einstein r…