Materials Literature
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Giant enhancement of the dielectric properties has been measured at the percolation threshold of a metal–insulator functional, graded composite using an in–situ electrical probe. The system reported (Mullite–Mo) combines very good thermal stability, low leakage currents, and very high capacitance, using dielectric mat…
x Ray crystallography is currently the most favoured technique for structure determination of proteins and biological macromolecules. Increasingly, those interested in all branches of the biological sciences require structural information to shed light on previously unanswered questions. Furthermore, the availability…
We have studied charge injection and charge transport in thin disordered films of CdSe nanocrystals between metal electrodes. Current–voltage characteristics of these devices are investigated as a function of electrode material, nanocrystal size, and temperature. We measure the photocurrent response of these structure…
A miscible homopolymer–copolymer pair viz., poly(ethyl methacrylate) (PEMA)–poly(styrene-co-butyl acrylate) (SBA) is reported. The miscibility has been studied using differential scanning calorimetry. While 1 : 1 (w/w) blends with SBA containing 23 and 34 wt % styrene (ST) become miscible only above 225 and 185 °C res…
MOTIVATION: Typesetting, shading and labeling of nucleotide and peptide alignments using standard word processing or graphics software is time consuming. Available automatic sequence shading programs usually do not allow manual application of additional shadings or labels. Hence, a flexible alignment shading package w…
The fabrication and properties of polymer network–stabilized liquid crystals, formed by polymerization of a small amount of a bifunctional photoreactive monomer dissolved in a liquid-crystalline phase, are reviewed. The polymer network morphology is strongly related to preparation conditions such as monomer content, p…
PURPOSE: To investigate the accumulation and cellular uptake of long-circulating dextran-coated iron oxide (LCDIO) particles in malignant neoplasms in vivo. MATERIALS AND METHODS: A gliosarcoma rodent model was established to determine the distribution of a model LCDIO preparation in tumors. LCDIO accumulation in tiss…
There has been tremendous progress in the area of organic electronic materials and devices recently. However, many challenges and problems remain to be addressed for practical applications of such materials and devices. This article seeks to summarize some of the important recent materials-related research on organic…
A photocrosslinkable chitosan to which both azide and lactose moieties were introduced (Az-CH-LA) was prepared as a biological adhesive for soft tissues and its effectiveness was compared with that of fibrin glue. Introduction of the lactose moieties resulted in a much more water-soluble chitosan at neutral pH. Applic…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStereoselective Polymerization of a Racemic Monomer with a Racemic Catalyst: Direct Preparation of the Polylactic Acid Stereocomplex from Racemic LactideChristopher P. Radano, Gregory L. Baker, and Milton R. SmithView Author Information Department of Chemistry, Michiga…
The polarization resistance method for the determination of instantaneous corrosion rates of metals were reviewed. The assumptions in electrode kinetics that govern the connection between the slope of steady-state applied electrochemical potential-applied current density (Eapp-iapp) measurements (i.e., the polarizatio…
A series of molecular-dynamics simulations using a many-body interatomic potential has been performed to investigate the behavior under load of several 〈001〉 and 〈011〉 symmetrical tilt grain boundaries (GB's) in diamond. Cohesive energies, the work for fracture, maximum stresses and strains, and toughness as a functio…
Poly(propylene) compounds containing organophilic layered nanosilicates were prepared by means of melt extrusion at 210°C in order to investigate the role of silicate modification and compatibilizer addition on morphology development and mechanical properties. Synthetic sodium fluoromica was used as water swellable la…
The glass transition temperature T(g) and the temperature T(alpha) corresponding to the peak in the dielectric loss due to the alpha process have been simultaneously determined as functions of film thickness d through dielectric measurements for polystyrene thin films supported on glass substrate. The dielectric loss…
Strong room-temperature photoluminescence (PL) in the wavelength range 650–950 nm has been observed in high temperature annealed (1000–1300 °C) substoichiometric silicon oxide (SiOx) thin films prepared by plasma enhanced chemical vapor deposition. A marked redshift of the luminescence peak has been detected by increa…
Blue shifts corresponding to the absorption edge in the UV-A (310–400 nm) range are obtained from ultraviolet (UV) absorption spectra of monodisperse CeO2−x (0<x<0.5) nanoparticles, which are produced as toluene suspensions by a successive microemulsification method. The blue shift of the nanoparticles i…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMorphological Control of Highly Ordered Mesoporous Silica SBA-15Dongyuan Zhao, Jinyu Sun, Quanzhi Li, and Galen D. StuckyView Author Information Department of Chemistry, Fudan University, Shanghai, 200433, People's Republic of China, and Department of Chemistry, Univer…
Numerous biodegradable polymers have been developed in the last two decades. In terms of application, biodegradable polymers are classified into three groups: medical, ecological, and dual application, while in terms of origin they are divided into two groups: natural and synthetic. This review article will outline cl…
Silicon nitride has been researched intensively, largely in response to the challenge to develop internal combustion engines with hot‐zone components made entirely from ceramics. The ceramic engine programs have had only partial success, but this research effort has succeeded in generating a degree of understanding of…
We show theoretically with the simplest possible model that the intensity of an upconversion luminescence that is excited by the sequential absorption of n photons has a dependence on absorbed pump power P, which may range from the limit of ${P}^{n}$ down to the limit of ${P}^{1}$ for the upper state and less than ${P…