Materials Literature
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We have investigated the crystal structures of 186 polar molecular organic compounds with the aim to consider the occurrence of ferroelectric state. There are 16 crystals suspected of ferroelectricity. The results of tentative experimental investigations are also included.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Core Isomerism in dppm-Bridged Polymetallic Complexes. Synthesis, Reactivity, and Structure of Fe-Hg-Pt, Fe-Sn-Pt, and Fe-Pd-Sn Arrays (dppm = Ph2PCH2PPh2)Pierre Braunstein, Michael Knorr, Martin Strampfer, Antonio Tiripicchio, and Franco UgozzoliCite this: Organometal…
The nucleation and growth of diamond films on Nicemented carbide is investigated. Substrates made of WC with 6 wt% of Ni were submitted to grinding, and then to different pretreatments (scratching, etching, and/or decarburization) before diamond deposition. Diamond synthesis was carried out by hot‐filament chemical va…
We are concerned with a family of minimization problems arising in Quantum Chemistry for the modelling of the ground state of a molecule. We study the multiconfiguration methods, which are an extension of the well known Hartree–Fock method. We propose a general approach to prove the existence of the ground state in th…
Angular predictions of directional scattering distributions for metal and dielectric surfaces with length scales of the order of the wavelength are made from rigorous electromagnetic scattering theory. The theoretical and numerical formulation of the electromagnetic scattering solution based on the extinction theorem…
Poly(styrene-isobutylene-styrene) (PS-PIB-PS) block copolymers synthesized via living carbocationic polymerization using a di- or tricumyl chloride/TiCl4/pyridine initiating system in 60/40 (v/v) hexane/methyl chloride cosolvents. The kinetics of formation of the PIB block at − 80°C were found to be first order in iso…
The thermal conductivity has been measured in the temperature range 5–400 K for a series of chemical-vapor-deposited diamond samples differing only in thickness. By analyzing the conductance, a local conductivity is extracted as a function of height z above the substrate on which the samples were grown. An analysis of…
A statistical dynamic theory is presented to describe the effects of relaxation of the microstructure, frequency, and volume fraction (\ensuremath{\varphi}) on the complex shear viscosity of concentrated colloidal dispersions. On the basis of a fluid lattice model, the relationship between the memory function and rela…
Abstract Acetoxypropylcellulose (APC) and propionic, n ‐butyric, isobutyric, valeric, isovaleric, hexanionic, and heptanionic acid esters of hydroxypropylcellulose (HPC) (respectively PPC, BPC, iBPC, VPC, iVPC, HexPc, and HepPc) were prepared and characterized by differential scanning calorimetry, chromatography, pola…
Abstract Infrared spectroscopy was used to study the structure and deformation behaviour of a series of model poly(ether‐urethane) (PEU) elastomers. These materials contain (molecularly) uniform hard segments obtained from piperazine and the bischloroformate of 1,4‐butanediol with a poly(oxytetramethylene) soft segmen…
Abstract N ‐alkyl‐substituted itaconimides (RII) and N ‐(alkyl‐substituted phenyl)itaconimides (RPhII) with various alkyl substituents were prepared and polymerized in the presence of a radical or anionic initiator to give high molecular weight polymers in high yields. The effects of the alkyl substituents on the poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregation Study of a BAB Triblock Copolymer at the A/B Homopolymer InterfaceKevin H. Dai, Junichiro Washiyama, and Edward J. KramerCite this: Macromolecules 1994, 27, 16, 4544–4553Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Publishe…
The effect of /sup 60/Co radiation on the leakage current behavior of hydrogenated amorphous silicon photodiode sensors has been investigated. These sensors, with an n-i-p construction, are identical to those used on two-dimensional, pixelated imaging arrays currently under development. Sensor leakage current is repor…
Epitaxial p-type Schottky diodes have been fabricated on p/sup +/-substrate. While the activation energy of the epitaxial layer conductivity is 390 meV, that of the substrate is only 50 meV. At forward bias the substrate conductivity dominates above 150/spl deg/C, leading for a 5/spl times/10/sup -5/ cm/sup 2/ area co…
Abstract The interaction energies between PS, Pα‐MS, and PMMA with several bisphenol‐A‐based polycarbonates were quantitatively determined from oligomer/oligomer, oligomer/homopolymer, and homopolymer/copolymer blends. Interaction energies were calculated from the Flory‐Huggins theory and the Sanchez‐Lacombe equation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward New Magnetic, Electronic, and Optical Materials: Synthesis and Characterization of New Bimetallic Tetrathiafulvalene Tetrathiolate Building BlocksRichard D. McCullough and John A. BelotCite this: Chem. Mater. 1994, 6, 8, 1396–1403Publication Date (Print):August 1, 199…
It is shown that the introduction of a porous structure into single-crystal Si produces substantial changes in the photoelectronic properties. The porous Si (PS) layer is formed by anodization of p-type Si wafers in a HF solution. The photoconduction cells used in this study consists of a semitransparent thin Au film,…
Several aluminum oxides (α‐Al 2 O 3 , θ‐Al 2 O 3 , and AIOOH) were examined to study the differences in reaction behavior and powder characteristics during carbothermal nitrida‐tion to AIN using sucrose and carbon black. The reaction conditions investigated were carbon‐to‐alumina ratio, reaction temperature, and time.…
Phosphate sorption by the surface horizon of 228 acid to neutral Western Australian (W.A.) soils is more closely related (r(2) = 0.76) to the content of oxalate-extractable aluminium than to any other soil constituent. This fraction corresponds to poorly ordered inorganic and organic Al compounds that release consider…
Cummins and collaborators [Phys. Rev. A 46, 3343 (1992)] have interpreted their recent dynamic light-scattering data on supercooled liquid Salol in terms of mode-coupling theory. They asserted that critical slowing down occurs at a temperature ${\mathit{T}}_{\mathit{c}}$ which is much above ${\mathit{T}}_{0}$ where ex…