Materials Literature
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We introduce an effective-medium theory for the local field and mean dielectric function of a polymer dispersed liquid crystal (PDLC) film consisting of identical spherical liquid crystal droplets dispersed in a polymer matrix. The theory takes account of the tensor nature of the dielectric response of the liquid crys…
Uni-axial anisotropy constants and uni-axial anisotropy fields of oriented polycrystalline magnets were obtained from the field-dependence of the magnetization by three methods and from torque measurements. The results from torque measurements are found to be superior to those from the intersections of magnetization c…
A comparative study has been performed concerning the magnetization behaviour of single-phase and two-phase exchange-coupled . Measurements of reversible and irreversible magnetization and magnetic viscosity have been performed on nanocrystalline samples prepared by mechanical alloying and subsequent heat treatment. M…
Since its discovery the Mössbauer effect has been a powerful probe of iron in magnetic materials and, together with neutron scattering and magnetic resonance, complements measurements of magnetic susceptibility and magnetization. The magnetic hyperfine splitting of the spectrum gives a measure of the magnetic moment o…
In this paper, fundamental and practical aspects of the hydrogenation, disproportionation, desorption and recombination (HDDR) process in Nd - Fe - B-type alloys are reviewed. Thermodynamic aspects of the process are discussed as well as the microstructural changes throughout the different stages of the process. A det…
High-performance magnetic materials are based on outstanding intrinsic magnetic properties and optimized microstructures and alloy compositions. The interactions between these three parameters in general are rather complex and cannot be treated explicitly by the theory of micromagnetism. Instead numerical methods have…
The linear viscoelastic behavior of polydisperse polypropylenes in the melt is predicted using the molecular weight distribution (MWD) as determined from gel permeation chromatography, on the basis of simplified molecular dynamics: single exponential form of the relaxation modulus of narrow fractions, double reptation…
Owing to the unstable nature of the latex compound and the strict specifications in the quality of latex products such as condoms and examination gloves, the rejection in the latex industry comes to about 10 to 15% of the rubber consumed. These latex rejects contain about 95% rubber hydrocarbon of very high quality. A…
The accurate measurement of water vapor sorption and permeation in polymers is complicated because water has a tendency to adsorb on high energy surfaces, a relatively high heat of vaporization, and a high solubility in most polymers. These issues and the difficulties they cause in the design of sorption and permeatio…
Miscibility of 30 phr loaded black-filled (N110) blends of polyethylene-vinyl acetate (EVAc, VAc content 28%) and polychloroprene (CR) are investigated through shear and dynamic deformations. Both shear (ηa) and dynamic elongational (η′E) viscosities are conducive to their miscibility as both show positive deviation f…
Three-component systems with a polypropylene (PP) matrix consisting of polar elastomer (ethylene–propylene rubber and styrene–ethylene–butylene–styrene grafted with maleic anhydride) or of polar PP (PP grafted with maleic anhydride) and filler were investigated. Three microstructures of PP–elastomer–filler hybrids wer…
New catenane (cf 3) and rotaxane (cf 26) types have been obtained in remarkable yields via supramolecular template syntheses. The amide-based mechanically bonded structures can be designed by appropriate choice of building units. The selective formation of stable outlout, idin and idout [2]catenane isomers (cf Scheme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTπ-Dimers and π-Stacks in Solution and in Conducting PolymersLarry L. Miller and Kent R. MannView Author Information Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455 Cite this: Acc. Chem. Res. 1996, 29, 9, 417–423Publication Date (Web):September…
In this paper, we study an initial-boundary value problem for a system of phase-field equations arising from the Penrose–Fife approach to model the kinetics of phase transitions. In contrast to other recent works in the field, the correct form of the boundary condition for the temperature field is assumed which leads…
The problem of capillary-driven flow in a V -shaped surface groove is addressed. A nonlinear diffusion equation for the liquid shape is derived from mass conservation and Poiseuille flow conditions. A similarity transformation for this nonlinear equation is obtained and the resulting ordinary differential equation is…
The thermal resistance for conduction normal to diamond layers only a few microns thick, deposited at temperatures of about 500 °C on silicon using microwave-plasma-assisted chemical vapor deposition (MPACVD) and electron cyclotron resonance enhanced MPACVD, is measured using a specific laser-heating method. A detaile…
PbS/PbTiO3/Si heterostructures were prepared by successive depositions of a PbTiO3 thin film using the sol-gel method and of a PbS thin film using the coprecipitation method on a bulk silicon wafer. The current–voltage characteristic of the heterostructure is of a diode type. The heterostructure is sensitive over a br…
We present results of molecular dynamics simulations that show that the shear-induced ordering of hard spheres is preceded by the apparent decrease to zero (in certain directions) of the anisotropic pair-distribution function (PDF) at contact. This precursor to the ordering is explained on the basis of a careful inter…
Secondary electron (SE) image contrast from p-type silicon has been studied using field-emission scanning electron microscopy (FE-SEM). Cross-sectional FE-SEM images of boron-doped silicon heterostructures have been compared with atomic concentration and free carrier profiles measured by secondary-ion mass spectroscop…
We report novel odd-even layering effects in freely suspended films of the chiral liquid crystal MHPOBC in its antiferroelectric smectic phase. Films with an odd number of smectic layers are characterized by transverse ferroelectricity (molecular tilt plane perpendicular to applied electric field E), while films with…