Materials Literature
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Explicit expressions for the Frank elasticity coefficients of nematic liquid crystals are obtained using the model of perfect local orientational order. The use of the density functional approach enables one to express the results in terms of the direct correlation function for a liquid of perfectly aligned particles.…
Abstract Some mechanical and electrical properties of the BPDA/ODA/PDA polyimide film prepared on mylar followed by various cure schedules have been studied. It has been found by FTIR that the imidization reaches its maximum after a 200°C cure schedule for this polyimide. However, the optimum condition of curing is a…
Abstract The effect of syndiotactivity of poly(vinyl alcohol) (PVA) both on the formation and thermal stability of the complex formed in the amorphous phase of PVA films is investigated, and then a model of the complex is presented. The amount of the complex formed in syndiotacticity‐rich PVA is much larger than that…
Frequency dependent rheology of magmas may result from the presence of inclusions (bubbles, crystals) in the melt and/or from viscoelastic behavior of the melt itself. With the addition of deformable inclusions to a melt possessing viscoelastic properties one might expect changes in the relaxation spectrum of the shea…
Widespread use of electric vehicles can have significant impact on urban air quality, national energy independence, and international balance of trade. An efficient battery is the key technological element to the development of practical electric vehicles. The science and technology of a nickel metal hydride battery,…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Abstract Chemical composition and physical properties of silk fibers from Gonometa rufobrunnae , a silkworm belonging to the family Lasiocampidae (order Lepidoptera, class Insecta) have been studied. G. rufobrunnae silk fibroin contains a large amount of glycine and alanine, as well as hydroxyl, acidic, and basic amin…
Following the method of Gibbs, the equilibrium equations for a solid and various fluids in contact, including capillarity and elasticity, are written for the general case. They are then applied to the example of a thin plate in contact with a drop of fluid. The classical Young's equation is modified.
A nuclear reaction analysis technique using the p,γ reaction, 7Li(p,γ)8Be, occurring at approximately 440 keV, (half-width≊12 keV), has been utilized to determine the lithium concentration profiles in multilayer electrochromic window (‘‘smart window’’)/rechargeable battery cells when in their ‘‘colored’’/charged and ‘…
We have examined the reflection high-energy electron diffraction (RHEED) specular beam intensity oscillations on vicinal AlAs(001) which was grown on GaAs(001) substrates misoriented by 2° or 3° toward [110], [010], and [1̄10]. The temperature dependence of the RHEED oscillation behavior on vicinal surfaces is similar…
We present a new microscopic theory for the frequency (\ensuremath{\omega}) and density (\ensuremath{\varphi}) dependent complex shear viscosity \ensuremath{\eta}(\ensuremath{\varphi},\ensuremath{\omega}) of dense hard sphere colloids near equilibrium. The predictions are in good agreement with experimental results fo…
Random tiling models cover the plane with a set of rigid tiles without gaps between tiles and without overlap. This paper considers tilings of the plane by squares and equilateral triangles which display twelvefold rotational symmetry and quasi-long-range quasiperiodic translational order. Tiling configurations may be…
An investigation was made of the energy transfer between Eu 2+ and Mn 2+ ions in CaCl 2 single crystals under photoexcitation. The studies performed at several impurity concentrations and the measurements of the excitation spectra and lifetimes of the observed europium and manganese emissions in the temperature range…
Epitaxial thin films of cobalt ranging from 1 ML up to 10 ML have been grown on a Cu(100) substrate and characterized by LEED. The cobalt is found to grow, adopting a slight tetragonal distortion of its high-temperature FCC phase. Further growth of 5 ML Cu on top of a 5 ML Co film results in an almost perfect Cu(100)…
We present results of the electronic structure and stability of some forty valence electron icosahedral ${\mathrm{Al}}_{12}$X (X=B, Al, Ga, C, Si, Ge, Ti, and As) clusters within the local spin density functional theory. It is shown that the stability of the ${\mathrm{Al}}_{13}$ cluster can be substantially enhanced b…
Introducing holes (or partly eliminating electrons) in Mott-Hubbard insulator ${\mathrm{LaTiO}}_{3}$ (with 3${\mathit{d}}^{1}$ configuration) can be carried out by partial substitution of La with Sr, which produces the strongly correlated metallic phase. Systematic variation of electronic properties in ${\mathrm{Sr}}_…
The possibility induction of light emission from silicon, an indirect bandgap material in which radiative transitions are unlikely, raises several interesting and technologically important possibilities, especially the fabrication of a truly integrated optoelectronic microchip. In this article, the natural considerati…
Commercial Zn-Al alloys are susceptible to Intergranular Corrosion (IGC) restricting their widespread use for various applications. In this paper the IGC behaviour of two important foundry alloys namely Zn-8Al and Zn-12Al has been studied through microstructural observations with a view to improving the resistance to…
We still have much to learn about the morphologies of natural and synthetic polymers crystallized in bulk. Nevertheless, conventional X-ray and thermodynamic studies of crystallinity in polymeric materials over the past 60 years have given us a clear picture of the concept of crystallinity and the molecular features w…
Dislocations produced in Ge by high-temperature indentation have been studied using high-resolution transmission electron microscopy. An interesting defect has been observed which consists of a 1/6⟨411⟩ partial dislcation separated by an intrinsic stacking fault from a 1/6⟨121⟩ 30° partial. The unusual 1/6⟨411⟩ partia…