Ac Impedance Study of Transport Processes in Polyaniline Membranes
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A New Skin Equivalent
Three types of artificial skin containing keratinocytic components were prepared and tested for comparison. Keratinocytes were cultured on the artificial skin dermis (collagen sponge) by the air-liquid interface culture method. In order to create continuous keratinocytic layers on the artificial skin dermis, pores of…
On the thickness of ferroelastic twin walls in lead phosphate Pb3(PO4)2 an X-ray diffraction study
The effective thickness of ferroelastic twin-walls (W-walls) in Pb3(PO4)2 at room temperature (≈ 0.7 T c ) was determined by X-ray diffraction. The diffraction profiles were analysed using a wall profile e=eotanh x/w where W is the effective wall thickness including the effects of wall bending and surface relaxations.…
Semiconducting Barium Titanate Ceramics Prepared by Boron‐Containing Liquid‐Phase Sintering
Semiconducting BaTiO 3 ceramics have been prepared by adding BN as a sintering aid. Density as high as 93% of theoretical and grain size as large as 16 μm are obtained after sintering at 1160°C. Most significant is that the semiconducting BaTiO 3 is obtained at sintering temperatures as low as 1100°C. The low‐temperat…
Holographic Recording, Using Liquid Crystalline Side Chain Polymers
The review describes the principles of a holographic storage process based on the liquid crystalline state of organic polymeric materials. Such materials are capable of forming anisotropic glasses, which can be obtained as thin films. By suitable means one is able to align the optical axis of the uniaxial system withi…
Influence of Chain Entanglement on the Failure Modes in Block Copolymer Toughened Interfaces
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Chain Entanglement on the Failure Modes in Block Copolymer Toughened InterfacesC. Creton, H. R. Brown, and V. R. DelineCite this: Macromolecules 1994, 27, 7, 1774–1780Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published i…
Ferroelectric Behavior in Metal-Containing Liquid Crystals: A Structure-Activity Study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerroelectric Behavior in Metal-Containing Liquid Crystals: A Structure-Activity StudyM. J. Baena, J. Barbera, P. Espinet, A. Ezcurra, M. B. Ros, and J. L. SerranoCite this: J. Am. Chem. Soc. 1994, 116, 5, 1899–1906Publication Date (Print):March 1, 1994Publication History Pu…
Photooptical Switching of Polymer Film Waveguide Containing Photochromic Diarylethenes
Fabrication of a photooptical switching device based on the photo-induced refractive index change of polymer film doped with photochromic compounds is described. 1,2-bis(2-methylbenzo[b]thiophen-3-yl) perfluorocyclopentene (BFCP) and 1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (CMTE) were used as the photochr…
Improved Surface Smoothness of YBa2Cu3Oy Films and Related Multilayers by ArF Excimer Laser Deposition with Shadow Mask “Eclipse Method”
By simply placing a shadow mask between the target material and substrate, the particle (or droplet) problem peculiar to the excimer laser deposition technique was completely eliminated. It is tentatively called the “ eclipse method ”, in which the deposition proceeds through only diffusion. Mirrorlike YBa 2 Cu 3 O y…
Room-temperature persistent spectral hole burning in Sm^2+-doped fluoride glasses
Persistent spectral hole burning is observed in Sm(2+)-doped glasses at room temperature. The holes are burned in the (7)F(0) ? (5)D(0), (5)D(1) lines of the Sm(2+) ions in three kinds of fluoride glass. The dependence of the burning efficiency on the sample and on the burning intensity is measured. The intensity depe…
Nonlinear Optical Properties of Poled Polymer of Phenoxy Resin Containing α-Cyano Unsaturated Carboxylate
A new nonlinear optical polymer of phenoxy resin containing 2-cyano-5-(4-methoxyphenyl)-2,4-pentadienoate as a pendant group is synthesized. A high concentration (84%) of chromophores with a relatively high value of hyperpolarizability ( 50×10 -30 esu) is obtained. The corona-poled polymer film shows hypochromic shift…
Effects of neutron irradiation on vanadium-base alloys
Vanadium-base alloys of the V-Cr-Ti-Si system are attractive candidates for use as structural materials in fusion reactors. The vanadium-base alloys exhibit relatively low long-term activation, irradiation induced afterheat and neutron-induced helium transmutation rates. Because of favorable physical properties these…
Charge‐sensitive secondary electron imaging of diamond microstructures
Abstract The surface orientation and detailed defect microstructure of polycrystalline diamond can be observed in a scanning electron microscope through local changes in the surface conductivity. The electron contrast in uncoated samples is straightforward to distinguish when the rms surface roughness is less than abo…
Analysis of a Hysteresis Motor on Asynchronous Speed Using Complex Permeability
This paper deals with a method for determining the complex permeability in analysis of hysteresis motors. The method assumes that the magnetic intensity distribution is sinusoidal in the direction of rotation. Analysis of the asynchronous speed of a hysteresis motor is then performed for cylindrical coordinates, using…
Raman intensity of lattice vibrations in BaCl2 · 2H2O. Many‐body treatment
Abstract Polarized Raman spectra of BaCl 2 · 2H 2 O and their assignments are reported. The Raman intensity was analysed by means of the pair approximation and the many‐body interaction among induced dipoles. It was found that the many‐body treatment is more quantitative than the pair approximation, although the agree…
Effect of crystallinity on PVC physical properties
Abstract Crystallinity in PVC contributes significantly to the strength and resiliency of the polymer. Two types of crystallites have been described: a primary crystallite in the virgin powder state pictured as a platelet or flat needle‐like lamellar crystallite, and a secondary, fringed micellar crystallite from melt…
Kinetics and Mechanism of the Reduction of Manganese Porphyrins: Reaction at the Periphery of the Porphyrin Ring
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of the Reduction of Manganese Porphyrins: Reaction at the Periphery of the Porphyrin RingRobert J. Balahura and Richard A. KirbyCite this: Inorg. Chem. 1994, 33, 6, 1021–1025Publication Date (Print):March 1, 1994Publication History Published online1 Ma…
Reaction of hals in polypropylene during light exposure: Part 1‐iso‐octane as reaction model compound ‐
Abstract The photo and thermal reactivity of nitroxyl radicals derived from di‐, (oligo)meric hindered amine light stabilizers (HALS) on iso‐octane, a model compound for polyprophylene, was studied and compared to that of monomeric 2,2,6,6‐tetramethyl‐ piperi‐dine‐N‐oxyl (TEMPO). The exchange‐interaction among >NO…
Adhesion properties and phase separation behavior of glycidyl‐terminated polyurethanes
Abstract 2,3‐Epoxy‐1‐propanol has been introduced into isocyanate‐terminated polyurethane to form glycidyl‐terminated polyurethane resins. A series of glycidyl‐terminated polyurethanes based on hydroxyterminated poly(oxypropylene) (poly(oxypropylene) glycol, PPG), toluene diisocyanate (TDI), and 1,4‐butanediol (BD) wa…
Morphology and Polymorphism of Terephthalic Acid
The phase characterisation and morphologies of forms I and II terephthalic acid are presented. The structural nature of the II ↔ I polymorphic phase transition has been explored and form II shown to be more stable at room temperature and pressure. A new mechanism is proposed for the apparent stability of multiply twin…