Materials Literature
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It is argued that the key factor required to make vacuum microelectronics successful is closely related to an understanding and control of the physics, materials and microfabrication technology for field emitter arrays (FEAs). The topics discussed are the optimization and theoretical limit of the FEA; thermal stabilit…
Foreword Introduction to the English edition Historical overview 1. Noncrystalline solids and glasses 2. The vitreous transition 3. Conditions for vitrification 4. Structure of glass: methods of study using radiation scattering 5. Structure of glass: use of spectroscopic methods 6. Phase separation in glasses 7. Study…
Two commercially available water‐soluble chitosan salts, chitosan lactate and chitosan hydroglutamate, were examined for antagonistic effect against Escherichia coli V517, Staphylococcus aureus MF‐31 and Saccharomyces cerevisiae 15. Significant inactivation of each population was evident within 2 min of incubation wit…
Abstract A theoretical equation has been developed to described the rate of slow crack growth in an ethylene‐hexene copolymer in terms of the basic morphological parameters. These parameters are spacing of the butyl branches, number of tie molecules, and the thickness of the lamellar crystal. Experimentally, the thick…
Several aspects of the oscillations of a gas bubble in a slightly compressible liquid are discussed by means of a simplified model based on the assumption of a spatially uniform internal pressure. The first topic considered is the linear initial-value problem for which memory effects and the approach to steady state a…
Nonlinear properties include intensity-dependent refractive index, multiphoton absorption, second and third harmonic generation, stimulated Raman and Brillouin scattering, and associated phenomena such as self-focusing, self-phase modulation, optical phase conjugation, and optical bistability. We report on a large amo…
A model is presented for the high-temperature transport properties of large-grain-size, heavily doped n-type silicon-germanium alloys. Electron and phonon transport coefficients are calculated using standard Boltzmann equation expressions in the relaxation time approximation. Good agreement with experiment is found by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanoscale metal oxide particles/clusters as chemical reagents. Synthesis and properties of ultrahigh surface area magnesium hydroxide and magnesium oxideSuchada Utamapanya, Kenneth J. Klabunde, and John R. SchlupCite this: Chem. Mater. 1991, 3, 1, 175–181Publication Date (Pr…
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