Phase Behavior of Some Linear Polyphenyls
(1979). Phase Behavior of Some Linear Polyphenyls. Molecular Crystals and Liquid Crystals: Vol. 49, No. 7, pp. 207-209.
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Origin and size distribution of secondary nuclei
Abstract Microscopic observations and Coulter counter measurements of the secondary nuclei produced when a parent crystal of potash alum was contacted with a solid rod suggest that these nuclei are born by an attrition mechanism which appears to be dependent on the growth rate of the crystal. The nuclei can be up to 5…
Interlayer correlations in smectic B phases
X-ray diffraction results are presented on very well aligned samples of several smectic B phases which show the existence of several kinds of interlayer correlations. The hexagonal closepacked layers may be stacked with ordered ABA... or ABCA... arrangements (where A, B and C denote the relative position of the layers…
Particle adhesion and removal in model systems. Part 2.—Monodispersed chromium hydroxide on steel
The adhesion of uniform spherical colloidal particles of chromium hydroxide (modal diameter 0.28 µm) on stainless steel surface and their subsequent removal by rinse solutions of various pH and Ca(NO3)2 concentrations were studied using the packed column technique. The particles were deposited on steel at pH 5. The pH…
Solubility and Diffusivity of Hydrogen in Vanadium and its Alloys around Room Temperature
The solid solubility in equilibrium with hydride and the diffusion coefficient of hydrogen around room temperature are determined in pure vanadium and its alloys. Both determinations are made with the resistivity measurement. The solid solubility is increased by the addition of Ti and Zr, slightly increased by Mo, not…
The molecular details of collagen hydration
Abstract Nuclear magnetic resonance and dielectric data on hydrated collagen are interpreted in terms of Ramachandran's hydration model. It is found that all data are compatible with this model, indicating two specific binding sites per three amino acids in the threefold collagen helix. Sorption data have been interpr…
Rhenium formyl and carboxy complexes derived from the cyclopentadienyl(dicarbonyl)nitrosylrhenium(1+) cation: models for the Fischer-Tropsch and water gas shift reactions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRhenium formyl and carboxy complexes derived from the cyclopentadienyl(dicarbonyl)nitrosylrhenium(1+) cation: models for the Fischer-Tropsch and water gas shift reactionsCharles P. Casey, Mark A. Andrews, and James E. RinzCite this: J. Am. Chem. Soc. 1979, 101, 3, 741–743Pub…
Tack and Viscoelasticity of Block Copolymer Based Adhesives
Tackification of block copolymers of the linear ABA or radial (AB) x type, in which the center block (B) is in the rubbery state at use temperature, follows principles established for other rubbery polymers except for peculiarities of the systems introduced by the block polymer domain structure. Successful pressure-se…
Contrast and resolution of SEM charge-collection images of dislocations
Image profiles obtained in the scanning electron microscope operating in the charge-collection mode are calculated for a dislocation perpendicular to a surface barrier. The image resolution is not limited by the minority-carrier diffusion length in the semiconductor, but only determined by the generation volume, in ag…
Acetate assimilation pathway of Methanosarcina barkeri
The pathway of acetate assimilation in Methanosarcina barkeri was determined from analysis of the position of label in alanine, aspartate, and glutamate formed in cells grown in the presence of [14C]acetate and by measurement of enzyme activities in cell extracts. The specific radioactivity of glutamate from cells gro…
Polyoxomolybdate-hydrocarbon interactions. Synthesis and structure of the CH2Mo4O15H3- anion and related methylenedioxymolybdates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxomolybdate-hydrocarbon interactions. Synthesis and structure of the CH2Mo4O15H3- anion and related methylenedioxymolybdatesV. W. Day, M. F. Fredrich, W. G. Klemperer, and R. S. LiuCite this: J. Am. Chem. Soc. 1979, 101, 2, 491–492Publication Date (Print):January 1, 197…
On the electronic structure of hexagonal boron nitride
Abstract The anisotropic emission of the K‐X‐radiation of boron and nitrogen in hexagonal boron nitride BN permits the determination of the π‐ and s̀‐subbands of the two X‐ray spectra. Together with the X‐ray photoelectron spectrum a consistent picture of the valence band of BN is obtained. Position and width of the s…
Attachment of spherical particles to the surface of a pendant drop and the tension of the wetting perimeter
The attachment of small glass spheres (<50 µm diameter) to the air–water interface is studied by micro-photography on a pendant drop in the presence of a cationic surfactant. The angle of wetting on the attached particles can be estimated from the photographs. Increasing the surfactant concentration increases this ang…
The Order-Disorder Phase Transition in Liquid Crystals as a Function of Molecular Structure. I. The Alkyl Cyanobiphenyls
The pretransitional behaviour of a homologous series of mesomorphic compounds, the alkyl cyanobiphenyls (CNρρC n H 2n + 1) for n = 5–12, has been studied as a function of temperature by light scattering in the isotropic phase. The higher homologues, n = 8–12, exhibit a smectic A phase that becomes increasingly importa…
Volume interactions in the statistical physics of a polymer macromolecule
ОБЪЕМНЫЕ ВЗАИМОДЕЙСТВИЯ В СТАТИСТИЧЕСКОЙ ФИЗИКЕ ПОЛИМЕРНОЙ МАКРОМОЛЕКУЛЫИ, М, Дифгииц, А
Up-conversion studied by selective time resolved excitation techniques in Pr3+ : LaF3
A strong blue fluorescence has been observed following orange-yellow laser excitation in the 1D2 multiplet of Pr3+ : LaF3. This blue fluorescence has different time evolution depending on the excitation wavelength within the absorption line. Time resolved excitation techniques have been used to study this time evoluti…
Elastic properties of single-crystal NaCl under high pressures to 80 kbar.
Adiabatic elastic moduli for a NaCl single-crystal under high pressures up to 80kbar at room temperature were determined through ultrasonic sound velocity measurements in a cubic anvil-type high pressure apparatus with a solid pressure transmitter. Ultrasonic measurements far both the longitudinal and transverse waves…
Procollagen segment-long-spacing crystallites: their role in collagen fibrillogenesis.
Naturally occurring segment-long-spacing crystallites of procollagen collagen have been found in the culture medium of fibroblasts from chick embryo tendon, human skin, and dermatosparaxic calf skin; in whole-mount preparations of cultured human skin fibroblasts; in homogenates of lathyritic chick embryo tendon, carti…
Landau theory of the reentrant nematic-smectic A phase transition
The reentrant, nematic to smectic A phase transition is shown to follow from the Landau theory if one assumes the existence of an optimum density for smectic ordering. The shape of the coexistence line in the P-T plane is fit exactly by this theory. The effects of concentration on reentrant behaviour are also explaine…
Physical Properties of One Dimensional Conductors
In the course of investigations of organic metals we have investigated the cation-radical series TMTTF2-X′ with X′ = BF4, ClO4, PF6, SCN and Br. On this isomorphous series a large range of physical properties have been studied: electrical conductivity, magnetic susceptibility, EPR, optical reflectivity and specific he…