Materials Literature
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Abstract A new monoclinic phase of cerium orthovanadate, CeVO4(H), was found during the course of oxidation of pseudo-perovskite CeVO3 below 400°C. It has been confirmed to crystallize in the huttonite-type structure (C2h5−P21⁄n), that of LaVO4. The lattice parameters were determined to be: a 0=6.98Å, b0=7.22Å, c0=6.7…
The normal and the abnormal absorption coefficients of X-rays due to the Compton scattering and the thermal diffuse scattering (TDS) are calculated numerically by taking into account the temperature effect. It is found that effects of both scatterings are comparable for light atoms such as Al and Si, and that the effe…
The existing measurements and theories of the low-temperature thermal properties, heat capacity, and thermal conductivity of polymers are reviewed with particular attention paid to the differences between partly crystalline and amorphous polymers. The most striking feature of the low-temperature heat capacity of polym…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual metalloporphyrins. IV. Novel methods for metal insertion into porphyrinsMinoru Tsutsui, Rance A. Velapoldi, Keinosuke Suzuki, Frederick Vohwinkel, Mitsuo Ichikawa, and Takashi KoyanoCite this: J. Am. Chem. Soc. 1969, 91, 23, 6262–6266Publication Date (Print):November…
The relaxation behavior of polymers at low temperatures, as studied by dynamic mechanical, dielectric, and nuclear magnetic resonance methods, is reviewed. Modulus values at 4 and 77°K are tabulated for a variety of both crystalline and amorphous polymers and are compared to room temperature values as well as to theor…
Abstract The wetting properties of a series of polyacrylates containing the fluoroalkyl group \documentclass{article}\pagestyle{empty}\begin{document}$ [\rlap{--} ({\rm CF}_{\rm 2} \rlap{--} )_2 {\rm CF}_2 {\rm H}\ $\end{document} have been studied. Where n is 7 and 9, the polyacrylates are highly crystalline at room…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Dispersion in Branched Polypropylene OxidesW. H. Stockmayer and J. J. BurkeCite this: Macromolecules 1969, 2, 6, 647–650Publication Date (Print):November 1, 1969Publication History Published online1 May 2002Published inissue 1 November 1969https://pubs.acs.org/doi…
Absolute differential cross sections of electrons elastically scattered by Hg have been measured at 500, 400, and 300 eV. We find that over this energy range, for angles between 2.5° and 20°, the measured cross sections can be accurately described using the Born approximation with a long-range effective potential of t…
The far-infrared spectra of thin films of ammonium iodide were recorded from − 170°C to room temperature. The results varied with the temperature at which the films were formed thus making the interpretation of the spectra difficult. Laser excited Raman spectra of polycrystalline NH4I, ND4I, NH4Br, and ND4Br were also…
On étudie la structure de gouttelettes de cristal liquide nématique en émulsion dans un liquide isotrope. Suivant la tension superficielle, les molécules sont normales ou tangentes à la surface. Les configurations stables sont alors soit en étoile, soit bipolaires. On calcule l'énergie de telles configurations en cham…
A bubble that would ordinarily dissolve in a liquid may instead grow by a process known as rectified diffusion, if it is located in a sound field of sufficient pressure amplitude. Threshold conditions for bubble growth and the rate of bubble growth have been measured for air bubbles in air-saturated water at an acoust…
Abstract A method is derived for the design of stirred tank reactors for homogeneous reactions. A simple mixing model proposed previously by Curl (4) is used to compute the effects of finite mixing time on complex chemical reactions. It is also shown how the parameters of the model can be obtained by tracer experiment…
1. Conductivity and u.v. and visible spectroscopic techniques were used to investigate the solution structure of the prosthetic group of the ferric haemoproteins (ferrihaem) in dimethyl sulphoxide, NN-dimethylacetamide, NN-dimethylformamide and sulpholane, and certain of their aqueous mixtures. 2. In neutral or acid d…
The heat capacity of RbAg4I5 has been measured in an adiabatic calorimeter between 5 and 340°K. The compound undergoes transformations at 121.8 and at 209°K and exhibits a very sizable configurational heat capacity. The latent heat and entropy changes of the apparently first-order transformation at 121.8°K are 190.9 ±…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of the metal atom in the reversible uptake of molecular oxygen. The structures of the molecular oxygen complexes formed by bis[bis(diphenylphosphino)ethane]iridium(I)hexafluorophosphate and its rhodium analogJohn A. McGinnety, Nicholas C. Payne, and James A. IbersCite t…
A modified close-coupling expansion has been developed and applied to calculate elastic electron-hydrogen-atom scattering phase shifts. This expansion into a complete discrete orthonormal basis set is a variant of the more usual close-coupling expansion into eigenstates of the target Hamiltonian. We retain the first f…
Abstract Stress-induced crystallization in a rapidly stretched natural rubber gum vulcanizate has been studied using thermal techniques to follow the development of crystallinity. A special-purpose analog computer has been assembled and used online to process the thermal and mechanical data obtained in high speed tens…
Abstract The viscosity‐average molecular weight, M v , of a polymer is given operationally through its limiting viscosity number [η] and the Mark‐Houwink equation [η] = KM v α , where K and α are empirical constants. If [η] is measured under different conditions, α and M v will vary for the same sample. M v α is the α…
Abstract In Fortführung früherer Arbeiten wurden die Oberflächen‐Spannungen von NaOH‐ und KOH‐Lösungen im Konzentrationsbereich bis ζ NaOH = 0,7 und ζ KOH = 0,6 und für Temperaturen von 20 bis 170°C nach dem Prinzip des maximalen Blasendruckes gemessen und als Ausgleichsfunktionen dargestellt. Die größte relative Abwe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of high- and low-spin nickel(II) complexes containing the macrocyclic ligand tetrabenzo[b,f,j,n,][1,5,9,13]tetraazacyclohexadecineStuart W. Hawkinson and Everly B. FleischerCite this: Inorg. Chem. 1969, 8, 11, 2402–2410Publication Date (Print):November 1,…