Materials Literature
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The effects of electric fields on the molecular alignment in the liquid crystal p-(anisalamino)-phenyl acetate are discussed. The behavior of this material is similar to that of p-azoxyanisole in that the ordering which is normally observed shows an alignment with the molecular axis preferring a direction parallel to…
A procedure was developed for the determination of the locations of shoulders and singularities of polycrystalline nuclear magnetic resonance (NMR) powder patterns in the presence of both nuclear quadrupole and anisotropic magnetic shift interactions. This determination was performed for both the satellites and the ce…
The elastomers investigated are cross-linked partly by primary and partly by secondary valencies, i.e., by allophanate, biuret, and cyanurate bonds, on the one hand, and by hydrogen bridges and other intermoiecular interactions, on the other. The so-called physical cross-linking effected by secondary valencies is asso…
Some models for the molecular structures of liquid crystals including a ferroelectric liquid are discussed. It is shown that a smectic liquid with a layered structure, in which the preferred orientation of the molecular axis is inclined against the layers, has some similarities with a nematic liquid. Such a tilted sme…
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Index of refraction has been measured on fused silica, Corning code 7940, ultraviolet grade; Vycor, Corning Code 7913, optical grade, and aluminosilicate glass, Corning Code 1723. Values of n are given in the range 0.2–3.4 μ and at temperatures from 26° to 826°C. The minimum-deviation technique was used, employing a m…
A model is developed for estimating effects due to electron scattering from grain boundaries, occurring simultaneously with background scattering. Since grain-boundary effects are negligible in bulk materials, the model is particularly relevant to polycrystalline metal films in which a very fine-grained structure is o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleAnodic oxide films on aluminumJ. W. Diggle, Thomas C. Downie, and C. W. GouldingCite this: Chem. Rev. 1969, 69, 3, 365–405Publication Date (Print):June 1, 1969Publication History Published online1 May 2002Published inissue 1 June 1969https://pubs.acs.org/doi/10.1021/cr60259a005h…
Abstract Butene‐1/propylene copolymers at different compositions have been studied by differential scanning calorimeter (D.S.C.) and dilatometric techniques in order to ascertain the influence of the comonomeric units on polymorphism. The results suggest that the phase transitions of these copolymers have the peculiar…
Abstract The partially oriented state of water absorbed on bovine achilles tendon has been confirmed by nuclear magnetic resonance methods. The average orientation is described in terms of three parameters which have been determined uniquely by using a novel combination of magnetic resonance and dielectric measurement…
Because of the near perfect local satisfaction of the valence requirements of each atom, which is complemented by the positional and compositional disorder, covalently bonded amorphous alloys are intrinsic semiconductors. We describe a band model with some novel features, which successfully describes several important…
Expressions for the matrix elements of the Hamiltonian and overlap integrals between large-polaron and nearly-small-polaron states are given in terms of various large- and nearly-small-polaron parameters. The dependence of the mass of the ground state on the bare-electron mass in a region of transition between large-…