Materials Literature
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Abstract Gelatinized starches were prepared with various content of glycerol and were investigated in terms of the effect of the glycerol addition on characteristics of starch and its blends. Poly (L‐lactic acid) (PLA) with various ratios of linear/star shaped PLA and starch gelatinized with various ratios of water/gl…
Core–shell microgels are crosslinked nanosized spherical particles with a chemical composition that is different on the surface compared to the core region. By employing a core with special optical properties, e.g., a core labeled either with organic dye molecules or noble metal clusters (see Figure), these particles…
Energy transfer (ET) from ferrocene or ruthenium tris(bipyridine) functionalized light-harvesting units allows the first observation of sensitized near-infrared (NIR) lanthanide (Ln) luminescence (Lum.; see scheme, Exc.=excitation). Since the donating triplet state of the ruthenium tris(bipyridine) antenna is luminesc…
The Focused Beam Reflectance Measurement (FBRM) technique provides on-line and in-situ information about the chord length distribution of a population of particles in dispersion. This is rather promising for applications such as crystal size distribution control in crystallization processes. The objective of this stud…
The potential energy surface of Lennard-Jones clusters is investigated using the activation-relaxation technique (ART). This method defines events in the configurational energy landscape as a two-step process: (a) a configuration is first activated from a local minimum to a nearby saddle-point and (b) is then relaxed…
We show that the Gaussian core model of particles interacting via a penetrable repulsive Gaussian potential, first considered by Stillinger [J. Chem. Phys. 65, 3968 (1976)], behaves as a weakly correlated "mean-field fluid" over a surprisingly wide density and temperature range. In the bulk, the structure of the fluid…
A gold rush can occur not only among diggers at the banks of a remote river, but also among chemists in catalytic research laboratories. Gold salts displaying high catalytic activity facilitate domino coupling reactions in C−heteroatom and C−C coupling. Thus, for example, furyl-substituted products 2 are preparatively…
Silsesquioxanes are a family of siloxane network polymers that have become important as vehicles for introducing organic functionalities into sol−gel materials. However, there has not been a systematic study of the capacity of organotrialkoxysilanes to form gels through the sol−gel process. In this study, we examined…
Auxetic behavior in zeolitic cage structures is predicted here using molecular modeling calculations and explained by the “rotating squares” mechanism shown in the Figure. These materials, which become wider when stretched and narrower when compressed, are illustrated to have great potential in separation technologies.
The formula of the pseudo-Voigt function expressed by a weighted sum of Gaussian and Lorentzian functions is extended by adding two other types of peak functions in order to improve the accuracy when approximating the Voigt profile. The full width at half-maximum (FWHM) values and mixing parameters of the Gaussian, th…
Electron emission from ferroelectrics (FEE) is an unconventional electron emission effect. Methods of FEE excitation are quite different compared to classic electron emission from solids. Two kinds of FEE have been observed, “weak” and “strong.” “Weak” electron emission (current density 10−12–10−7 A/cm2) occurs from p…
For faster, smaller, and higher performance integrated circuits, a low dielectric constant insulator is required to replace silicon dioxide. Here the properties of a new dielectric—SiLK resin, a solution of a low-molecular-weight aromatic thermosetting polymer—are reviewed and examples of its application in the fabric…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Solution-Phase Approach to the Synthesis of Uniform Nanowires of Crystalline Selenium with Lateral Dimensions in the Range of 10−30 nmByron Gates, Yadong Yin, and Younan XiaView Author Information Department of Chemistry University of Washington Seattle, Washington 9…
The effects of concentration and distribution of defects controlled by quenching and doping of higher-valent cations on the ferroelectric properties of dense Bi 4 Ti 3 O 12 ceramics were investigated. The remanent polarization ( P r ) of non-doped ceramics quenched from 800°C (above the Curie temperature) was twice as…
A fully analytical implementation of the nuclear magnetic resonance (NMR) indirect nuclear spin–spin coupling constants at the density-functional theory (DFT) level is presented. The implementation involves all four contributions of the nonrelativistic Ramsey theory: The dia- and para-magnetic spin–orbit contributions…
Nitrogen-rich carbon nitrides are produced as amorphous, bulk solids from the slow thermal decomposition of 2,4,6-triazido-1,3,5-triazine [(C 3 N 3 )(N 3 ) 3 ]. This energetic molecular azide is thermally unstable and readily decomposes at 185 °C in a high-pressure reactor to produce carbon nitride materials, e.g., C…
ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys is a comprehensive guide to the compositions, properties, processing, performance, and applications of nickel, cobalt, and their alloys. It features essential information adapted from the multi-volume ASM Handbook series, as well as expanded corrosion coverage w…
New nanocomposites are currently being developed that have real industrial potential—loading a polymer with a small (ca. 5 %) amount of inorganic nanoparticles (the Figure shows a polypropylene–clay hybrid composite) is expected to give rise to significant improvement to the materials properties with only a minor incr…
Substances forming calamitic mesophases have been known for more than 100 years but only the recent, rapid advance in active matrix liquid crystal display (AM-LCD) technology helped these materials to achieve the crucial position in flat panel display technology they hold today. Due to their high contrast, large viewi…
Supercritical water can provide an excellent reaction environment for hydrothermal crystallization of metal oxide particles. Because of the drastic change of properties of water around the critical point, density, dielectric constant, and ionic product, the phase behavior for the supercritical water−light gas (O 2, H…