Organometallic silicon dendrimers
The first series of organometallic silicon dendritic macromolecules, containing a controlled number of redox-active centres, are synthesized and characterized.
Materials Literature
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Film thickness measurements of SiO 2 by XPS
Abstract The preferred XPS methodology for measurement of SiO 2 film thickness on polished silicon surfaces is discussed. A precise measurement of the photoelectron attenuation length was made using nuclear reaction analysis (NRA) to calibrate the film thicknesses. Anodic oxide films on Si, which are very reproducible…
IR studies of cerium dioxide: influence of impurities and defects
An infrared study of CeO2 is presented which allows discrimination of the bands due to residual carbonaceous impurities from the bands arising from multiphonon absorption and electronic transitions induced by atomic defects. CO adsorption experiments show the presence of coordinatively unsaturated (cus) Ce3+ or Ce4+ s…
Direct observation of time-dependent space charge profiles in XLPE cable under high electric fields
Space charge distribution was measured, applying an electric field of >1 MV/cm to 3 mm thick XLPE cable insulation. Improving the conventional pulse electro-acoustic method, a new method was developed to measure space charge when applying HV to cables. Under high field, hetero charges were formed soon after voltage ap…
Why do Polyethylene Glycol-Coated Liposomes Circulate So Long?: Molecular Mechanism of Liposome Steric Protection with Polyethylene Glycol: Role of Polymer Chain Flexibility
The hypothesis is suggested describing the molecular mechanism of protective action of poly(ethylene glycol) on liposomes in vivo on the basis of polymer properties in solvent. The protective layer of polymer on the liposome surface is considered as a “cloud” of possible conformations of macromolecules. If polymer is…
Recycled Newspaper Fibers as Reinforcing Fillers in Thermoplastics: Part I-Analysis of Tensile and Impact Properties in Polypropylene
Recycled newspaper fibers (ONP) are potentially outstanding nonabrasive reinforcing fibers with high specific properties. In this study, a high energy thermokinetic mixer was used to mix these fibers in a polypropylene (PP) matrix, and the blends were then injection molded in order to observe the tensile and impact st…
Anionic ring-opening oligomerization and polymerization of silicon-bridged [1]ferrocenophanes: Characterization of short-chain models for poly(ferrocenylsilane) high polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic ring-opening oligomerization and polymerization of silicon-bridged [1]ferrocenophanes: Characterization of short-chain models for poly(ferrocenylsilane) high polymersRon Rulkens, Alan J. Lough, and Ian MannersCite this: J. Am. Chem. Soc. 1994, 116, 2, 797–798Publicat…
Growth of human cells on plasma polymers: Putative role of amine and amide groups
The attachment and growth of human endothelial cells and fibroblasts was studied on polymer surfaces fabricated by the polymerization of volatile amine and amide compounds in a low pressure gas plasma, and by the treatment of various surfaces in ammonia plasmas, which served to increase the nitrogen content of the sur…
Molecular-based mixed valency ferrimagnets (XR 4 )Fe II Fe III (C 2 O 4 ) 3 (X = N, P; R =,n-propyl, n-butyl, phenyl): anomalous negative magnetisation in the tetra-n-butylammonium derivative
The phases AFeIIFeIII(C2O4)3(A = NPrn4; NBun4; PPh4) have been synthesised and characterised chemically, structurally and magnetically; they behave as ferrimagnets, but the tetrabutylammonium salt shows a highly unusual negative magnetisation at low temperature.
Physics and chemistry of partial discharge and corona. Recent advances and future challenges
Results of recent research on physical and chemical processes in partial discharge (PD) phenomena are reviewed. The terminology used to specify different types or modes of PD are discussed in light of a general theory of electrical discharges. The limitations and assumptions inherent to present theoretical models are…
Space charge measurement techniques and space charge in polyethylene
Recently, several new techniques such as LIPP, PIPS, PEA and TP methods have been developed to measure directly the space charge distributions in insulating polymers. Many papers have been published on space charge in insulating materials. In this paper, the space charge measurement techniques and space charge in poly…
Efficient blue luminescence of a conjugated polymer exciplex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient blue luminescence of a conjugated polymer exciplexJohn A. Osaheni and Samson A. JenekheCite this: Macromolecules 1994, 27, 3, 739–742Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.a…
A Proposed Three-Dimensional Constitutive Model for Shape Memory Alloys
The shape memory alloy (SMA) stress-strain response associated with martensitic twinning hysteresis and austenite-martensite/martensite-austenite superelasticity is modeled using constitutive equations. Compared to the modeling work done on viscoelastic and viscoplastic be havior, this has been an area of limited stud…
Modelling the effects of eddy current losses on frequency dependent hysteresis in electrically conducting media
In recent studies it has been shown how the effects of classical eddy current losses can be used to extend the quasi-static hysteresis model to account for the frequency dependence of hysteresis in electrically conducting media. This paper deals with the extension of the hysteresis model to include anomalous or excess…
Two-step spin conversion of [FeII(5-NO2-sal-N(1,4,7,10))]: 292, 153, and 103 K x-ray crystal and molecular structure, infrared, magnetic, Moessbauer, calorimetric, and theoretical studies
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo-step spin conversion of [FeII(5-NO2-sal-N(1,4,7,10))]: 292, 153, and 103 K x-ray crystal and molecular structure, infrared, magnetic, Moessbauer, calorimetric, and theoretical studiesDidier Boinnard, Azzedine Bousseksou, Ary Dworkin, Jean Michel Savariault, Francois Varr…
Differential scanning calorimetry of polymers : physics, chemistry, analysis, technology
Fundamentals of DSC method and analysis of methodical factors affecting the results of quantitative measurements main transitions in the disordered structure of flexible-chain polymers features of relaxational transitions in different types of polymer revealed by DSC data relaxational transitions in multicomponent and…
Arc-furnace model for the study of flicker compensation in electrical networks
This paper presents an arc-furnace model consisting of nonlinear, time varying resistance where time-variation laws of arc length are considered. One consists of a periodic, sinusoidal law, the other of a band-limited white-noise law. The arc-furnace model is implemented by EMTP, referring to actual electric-plant con…
The Chemistry of TTFTT; 1: New Efficient Synthesis and Reactions of Tetrathiafulvalene-2,3,6,7-tetrathiolate (TTFTT): An Important Building Block in TTF-Syntheses
All articles of this category An improved and efficient synthesis of tetrathiafulvalene-2,3,6,7-tetrathiolate (TTFTT) 5 is reported. TTF-tetrathiolate 5 was generated from 2,3,6,7-tetrakis(2′-cyanoethylthio)tetrathiafulvalene ( 11 ) under basic conditions at room temperature and was subsequently reacted with a range o…
Physical Properties and Biodegradability of Microbial Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties and Biodegradability of Microbial Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)Eihaku Shimamura, Kenichi Kasuya, Genta Kobayashi, Takeshi Shiotani, Yu Shima, and Yoshiharu DoiCite this: Macromolecules 1994, 27, 3, 878–880Publication Date (Print):January 1…
Rigid rod conjugated polymers for nonlinear optics: 1. Characterization and linear optical properties of poly(aryleneethynylene) derivatives
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRigid rod conjugated polymers for nonlinear optics: 1. Characterization and linear optical properties of poly(aryleneethynylene) derivativesM. Moroni, J. Le Moigne, and S. LuzzatiCite this: Macromolecules 1994, 27, 2, 562–571Publication Date (Print):January 1, 1994Publicatio…