Materials Literature
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A preparation method for nanoparticles based on an emulsification of a benzyl alcohol solution of a polymer in a hydrocolloid-stabilized aqueous solution followed by a dilution of the emulsion with water, was developed. Several process parameters were varied, including the concentration of poly(vinyl alcohol) or gelat…
In this paper relevant aspects of digital processing of partial discharge (PD) as measured by conventional PD detection methods are discussed. Moreover, a systematic study of PD quantities is presented and discussed within the scope of practical PD analyzers, including recognition of defects in certain HV insulation c…
The surface chemistry of supported chromium catalysts (Cr/SiO2· Al2O3) has been systematically investigated as a function of the support composition (Si:Al ratio) and the Cr oxide loading by a combination of diffuse reflectance spectroscopy (DRS), Raman spectroscopy (RS), X-ray Absorption spectroscopy (EXAFS–XANES) an…
Contents: Biomimetics: Natural Materials as Paradigms for Superior Aerospace Systems (F.L. Hedberg and G.K. Haritos). Microstructure of an Insect Cuticle and Its Applications to Advanced Composites (S.L. Gunderson and R.C. Schiavone). Hierarchical Twin Structures and Multiple Tilings in the Nacre of Abalone Shell (M.…
Polymer-dispersed liquid-crystal films (PDLC) can be electrically switched from a zero-field opaque state to an activated clear state. They can be made in several ways, although UV polymerisation is most common. The physical performance of these films has led to their use in a wide range of applications from privacy f…
Moderate concentrations of a small non-adsorbing polymer cause a suspension of colloidal particles to phase separate into coexisting colloidal fluid and crystal via the ‘depletion’ mechanism. At higher polymer concentrations, crystallization is suppressed, and a variety of non-equilibrium aggregation behaviour is obse…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyol Recognition by a Steroid-Capped Porphyrin. Enhancement and Modulation of Misfit Guest Binding by Added Water or MethanolRichard P. Bonar-Law and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1995, 117, 1, 259–271Publication Date (Print):January 1, 1995Publication H…
The behavior of solids can be represented by a variety of continuum theories. For example, Cosserat elasticity allows the points in the continuum to rotate as well as translate, and the continuum supports couple per unit area as well as force per unit area. We examine experimental methods for determining the six Cosse…
Among the nonlinear optical (NLO) materials , second harmonic generators are important because of their applications in extending the limited frequencies available from lasers. A theory is presented that makes it possible to design and synthesize new NLO materials according to need, based on an understanding of the st…
Recent developments in high energy magnets have created widespread interest in the area of permanent magnet (PM) motors. The use of PM synchronous motors or brushless motors to replace conventional DC or induction type motors has not been as speedy as anticipated earlier. This paper deals with the temperature effects…
NO adsorption on CeO2 pre-outgassed at different temperatures (Tv) has been studied by EPR and FTIR. The results are compared with those obtained by measuring the products of the reaction, performed at 323 K, between NO and CeO2 samples activated by previous heating under N2 flow. EPR results indicate that, for Tv 573…
ADVERTISEMENT RETURN TO ISSUEPREVArticleImmobilization of metalloporphyrins in electropolymerized films: design and applicationsFethi Bedioui, Jacques Devynck, and Claude Bied-CharretonCite this: Acc. Chem. Res. 1995, 28, 1, 30–36Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Pub…
Physical and chemical properties of solid materials are strongly. influenced by the chemical composition of internal interfaces, One of the crucial parameters affecting interfacial chemistry is the atomic structure of the interface. Due to its importance. a considerable amount of work was done to elucidate the relatio…
Biomaterials are used in prostheses and medical devices for different purposes. Polymers are the most diverse class of biomaterials. All biomaterials must meet certain criteria and regulatory requirements before they can be qualified for use in medical applications. Biocompatibility is one of the most important requir…
The widespread use of SF/sub 6/ by the electric power and other industries has led to increased concentrations of SF/sub 6/ in the atmosphere. This causes concern as to possible effects on global warming, because SF/sub 6/ is a potent greenhouse gas. This paper first touches on this issue and then documents the behavi…
Numerous investigations have shown that the distribution profile of a drug can be modified at the cellular and tissular level by entrapment in submicronic colloidal systems (nanoparticles). This review provides an update on the technologies available for nanoparticles preparation. Their in vivo fate after intravascula…
"Introduction to Surface Chemistry and Catalysis." Drying Technology, 13(1-2), pp. 507–508
Ionic conductivities have been investigated for lanthanoid silicates of the Ln10(SiO4)6O3 solid solution series and related compounds. The activation energy and conductivity at 500 °C were estimated to be 69 kJ mol–1 and 1.8 × 10–4 S cm–1 for La10(SiO4)6O3 and 71 kJ mol–1 and 1.5 × 10–4 S cm–1 for Nd10(SiO4)6O3. The a…
Experimental data are presented of the development of PD activity in artificial air-filled spherical voids in epoxy resin over a period of /spl sim/6 months. The data are presented in the form of phase averaged plots of the charge distribution over the time (aging plots) and phase resolved histograms (PRPD patterns) a…
General aspects of biodegradable microspheres prepared from natural and synthesized polymers used in drug delivery systems are reviewed first from various viewpoints: characteristics of biodegradable polymers (physicochemical properties, bioerosion mechanism, biocompatibility), preparation method for the microspheres,…