Materials Literature
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A nematic liquid crystal, pentyl-cyano-biphenyl (5CB) is studied in two different flow situations: Poiseuille flow and torsional shear flow, in both cases with and without the simultaneous application of an electric field. The Poiseuille flow set-up gives an accurate determination of the Miesowicz viscosity ηc and a l…
Abstract The thermal properties of poly(ethylene terephthalate) (PET) are sensitively affected by polycondensation catalysts and temperature. The kinetics of thermal degradation were investigated by determining the rates of formation of carboxyl groups on isothermal heating. Carboxyl groups in PET were not only a resu…
Adsorption of bovine albumin, gamma-globulin and fibrinogen from phosphate buffer solution (pH = 7.5) onto several polymer films was studied using the radioiodinated proteins (125I). The kinetics of desorption of the proteinated polymer films in bovine plasma was determined. Contact angle measurements on these same po…
A smectic-$A$ liquid crystal in three dimensions has been predicted to exhibit algebraic decay of the layer correlations rather than true long-range order. As a consequence, the smectic Bragg peaks are expected to be power-law singularities of the form ${q}_{\ensuremath{\parallel}}^{\ensuremath{-}2+\ensuremath{\eta}}$…
A new type of collageneous structure, tentatively named 7-S collagen, was isolated from a mouse tumor basement membrane, mouse and human placenta, bovine lens capsule and human kidney. The protein was solubilized from the tissues by limited digestion with pepsin or trypsin and could easily be separated from other coll…
A 68,000 mol wt polypeptide has been identified as one of the few major proteins in the microfilament bundles of the microvilli present on intestinal epithelial cells. Antibodies against the purified protein have been used in indirect immunofluorescence microscopy on several cultured cells. The protein have been used…
Abstract—The application of dimensional analysis and similarity methods to the study of the speed of fatigue crack growth is considered. It is shown that the Paris range of the crack propagation diagram is an intermediate-asymptotic stage of the crack growth process. Over this stage the influence of the initial condit…
We have made a new type of cholesteric liquid-crystal display device that is bistable in the absence of an applied field. One of the two stable states has 360° of twist between the two surfaces. The other is an untwisted state, like an unstrained nematic with all directors parallel. One method of switching is to apply…
The oxidation of substituted catechols was studied by cyclic voltammetry, chronoamperometry, rotating ring‐disk electrode, and coulometry. The results showed that the quinones that were formed from the oxidation of substituted catechols reacted with the basic forms of the starting material to yield the dimeric product…
Abstract The water content at equilibrium was determined as a function of applied pressure for 35 different Na‐saturated montmorillonites by means of a miniature pressure membrane apparatus. Then the data were used to develop a general, empirical equation in which the swelling pressure of the montmorillonite depends e…
Describes a new formalism for the study of diffraction by a grating. It is characterized by a translation coordinate system which allows one to write a system of linear partial differential equations with constant coefficients, after using the Maxwell equations in curvilinear coordinates. The numerical application is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic Studies of Poly[N,N'-bis(phenoxyphenyl)pyromellitimide]. 1. Structures of the Polyimide and Three Model CompoundsHatsuo Ishida, Stephen T. Wellinghoff, Eric Baer, and Jack L. KoenigCite this: Macromolecules 1980, 13, 4, 826–834Publication Date (Print):July 1, 1…
Abstract not Available.
Studies of surface-enhanced Raman scattering from pyridine adsorbed on Ag surfaces in ultrahigh vacuum show a strong dependence on both surface roughness and pyridine coverage. The observation of enhancement (${10}^{4}$) for physisorbed pyridine multilayers in addition to the first molecular layer implies that the enh…
The spin polarisation of electrons scattered elastically by mercury atoms has been measured for collision energies between 8 and 18 eV. The results are discussed in comparison with ab initio calculations by Walker (1971) which show only fair agreement. The scattering at 14 eV incident energy and angles between 90 degr…
The Hamiltonian, $H$, of a spinless particle moving in two dimensions in an axially symmetric magnetic field $B(\ensuremath{\rho})$ is considered. If $B(\ensuremath{\rho})\ensuremath{\sim}{\ensuremath{\rho}}^{\ensuremath{-}\ensuremath{\alpha}}$ for $\ensuremath{\rho}$, large with $0<\ensuremath{\alpha}<1$, then…
A structural model is proposed for the polymeric units in silicate melts quenched at 1 atmosphere. The anionic units that have been identified by the use of Raman spectroscopy are SiO(4)(4-) monomers, Si(2)O(7)(6-) dimers, SiO(3)(2-) chains or rings, Si(2)O(5)(2-) sheets, and SiO(2) three-dimensional units. The coexis…
The solid solutions between the spinels MgAl2O4 and MgFe2O4 with the general formula MgAl2 − xFexO4 are synthesised and characterised by X-ray diffraction and application of Vegard's law. The cation distribution in this spinel system is determined from X-ray and magnetic susceptibility measurements. The electrical and…
A survey is given of experimental and theoretical studies related to the fundamental properties of single crystal vanadium oxides. Emphasis is put on the relationship which exists between V2O5 and the lower oxides, mainly V4O9 and V6O13. Special attention is paid to the role played by the vanadyl—oxygen vacancy, both…
X-ray diffraction investigations of both nematic and smectic phases of a number of compounds containing cyano end groups have revealed several of them to have a novel structure. This consists of two coexisting mass density fluctuations (heavily damped for the nematics) with incommensurate wavelengths corresponding, re…