Materials Literature
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Abstract In order to relate mineralogy to sorbent efficiency, organo‐clays were prepared from reference vermiculite, illite, smectite, and kaolinite clay minerals using the organic cation hexadecyltrimethylammonium (HDTMA). Adsorption isotherms using 14 C‐HDTMA indicated stoichiometric adsorption of HDTMA up to the ca…
An ongoing program on microfabricated field-emitter arrays has produced a gated field-emitter tip structure with submicrometer dimensions and techniques for fabricating emitter arrays with tip packaging densities of up to 1.5*10/sup 7/ tips/cm/sup 2/. Arrays have been fabricated over areas varying from a few micromete…
(1991). Why proteins prefer interfaces. Journal of Biomaterials Science, Polymer Edition: Vol. 2, Festschrift in Honor of the 75th Birthday of Dr. Leo Vroman: Part I, pp. 183-202.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoil-globule type transitions in polymers. 1. Collapse of layers of grafted polymer chainsE. B. Zhulina, O. V. Borisov, V. A. Pryamitsyn, and T. M. BirshteinCite this: Macromolecules 1991, 24, 1, 140–149Publication Date (Print):January 1, 1991Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in mixtures of a block copolymer and homopolymers. 1. Solubilization of low molecular weight homopolymersHideaki Tanaka, Hirokazu Hasegawa, and Takeji HashimotoCite this: Macromolecules 1991, 24, 1, 240–251Publication Date (Print):January 1, 1991Publication…
Some asparagine and glutamine residues in proteins undergo deamidation to aspartate and glutamate with rates that depend upon the sequence and higher-order structure of the protein. Functional groups within the protein can catalyze this reaction, acting as general acids, bases, or stabilizers of the transition state.…
Antireflection coatings for silicon solar cells have been optimized both theoretically and experimentally for a range of possible situations, such as single-layer and double-layer coatings, and on planar and microgrooved surfaces. The effect of a thin passivating silicon dioxide layer under the coating was also consid…
The authors describe a simple control for a permanent motor drive that provides a wide speed range without use of a shaft sensor. Two line-to-line voltages and two stator currents are sensed and processed in analog form to produce the stator flux linkage space vector. The angle of this vector is used in a microcontrol…
Abstract Die Verbindungsklasse der Metall‐Sauerstoff‐Clusteranionen ist nicht nur einzigartig hinsichtlich ihrer topologischen und elektronischen Vielfalt — sie hat auch erhebliche Bedeutung für ganz unterschiedliche Disziplinen. So sind die früheren Arbeiten auf diesem Forschungsgebiet mit Namen wie Berzelius, Werner…
The reduction of CeO2 by hydrogen has been studied from 300–1200 K by several complementary techniques: temperature-programmed reduction (TPR) and magnetic susceptibility measurements, Fourier-transform infrared (FTIR), UV–VIS diffuse reflectance and X-ray photoelectron (XP) spectroscopy. Two CeO2 samples were used wi…
This paper reviews what is known about the structures and optical properties of point defects in silica glass and other amorphous forms of SiO2. The available structural information derives mainly from the results of electron spin resonance (ESR) spectrometry-a method which is directly applicable only to the subclass…
This article first provides a concise summary of the concepts, limitations, and paradigms of biological self-assembly processes, then surveys covalent self-assembly processes in the synthesis of 3-dimensional molecules and ordered assemblies
The present book is the result of diverse courses on diffusion. It is intended to give as complete an overview as possible of diffusion in solid media, while relating the process of diffusion to both their physical bases and their applications. A series of a real situations is covered in this account, from self-diffus…
Material-dependent properties influencing the performance of fiber amplifiers are reviewed together with the available data for Er/sup 3+/. The major glass types potentially useful in this application are considered and compared to silica. The topics addressed include quenching processes and the solubility of rare-ear…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS studies of solvated metal atom dispersed (SMAD) catalysts. Evidence for layered cobalt-manganese particles on alumina and silicaBeng Jit Tan, Kenneth J. Klabunde, and Peter M. A. SherwoodCite this: J. Am. Chem. Soc. 1991, 113, 3, 855–861Publication Date (Print):January 1…
Basic Principles of Chemical Bonding. Chemical Reactions in the Gas Phase and in Simple Solvent Models. Chemical Reaction in All--Atom Solvent Models. Potential Surfaces and Simulations of Macromolecules. Modeling Reactions in Enzymes: An Introduction. General Acid Catalysis and Electrostatic Stabilization in the Cata…
Ceramic nanocomposites can be divided into three categories: intergranular nanocomposite, intergranular nanocomposite and nano/nano composite. The intra- and intergranular nanocomposites were found to show the two to five times higher toughness and strength at room temperature than those of monolithic materials. The h…
The ultraviolet–visible absorption spectra are given for 10 nm diameter colloidal particles of 52 of the metallic elements, calculated from the optical constants of the metals by means of Mie theory. For most of the elements the spectra cover the range 200–900 nm. Well resolved absorption bands are observed for colloi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanometer-sized semiconductor clusters: materials synthesis, quantum size effects, and photophysical propertiesYing Wang and N. HerronCite this: J. Phys. Chem. 1991, 95, 2, 525–532Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published…
Abstract Inorganic metal–oxygen cluster anions form a class of compounds that is unique in its topological and electronic versatility and is important in several disciplines. Names such as Berzelius , Werner , and Pauling appear in the early literature of the field. These clusters (so‐called isopoly‐ and heteropolyani…