Materials Literature
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The mechanism of Pi interaction with phosphate binding protein of Escherichia coli has been investigated using the A197C mutant protein labeled with a coumarin fluorophore (MDCC-PBP), which gives a fluorescence change on binding Pi. A pure preparation of MDCC-PBP was obtained, in which the only significant inhomogenei…
A very small capacitive sensor for measuring thermal expansion and magnetostriction of small and irregular shaped samples has been developed. A capacitive method with tilted plates is used. The tilted plate capacitance formula is used for the calculation of the capacitor gap, the calibration is performed by measuring…
Stress paths in granular matter often suffer sudden large-scale rearrangements when the system is slightly perturbed, i.e. granular systems are unstable. We show in this paper that the observed instability is due to the minimally rigid, or isostatic, character of the system's contact network. It is first demonstrated…
We summarize ideas and methods that apply to rigidity and connectivity percolation. These include: constraint counting concepts, exact calculations on diluted trees and numerical results on diluted lattices using matching algorithms. The similarities and differences between connectivity and rigidity percolation are di…
Based on the anionic group theory of nonlinear optical crystals and the relationship between the microscopic nonlinear coefficients of the anionic group and the macroscopic coefficients of the crystal, an evaluation system has been established to analyze the spatial arrangement of the anionic groups in a crystal latti…
A series of novel manganese(II)-substituted polyoxometalates, [(Mn II (H 2 O) 3 ) 2 (WO 2 ) 2 (BiW 9 O 33 ) 2 ] 10 - ( 1 ), [(Mn II (H 2 O)) 3 (SbW 9 O 33 ) 2 ] 12 - ( 2 ), and [(Mn II (H 2 O) 3 ) 2 (Mn II (H 2 O) 2 ) 2 (TeW 9 O 33 ) 2 ] 8 - ( 3 ), were synthesized and characterized by X-ray structure analyses. The us…
Abstract In this paper, a study on the batch processing and characterization of microcellular foamed high‐density polyethylene (HDPE/iPP) blends is reported. A microcellular plastic is a foamed polymer with a cell density greater than 10 9 cells/cm 3 and fully grown cells smaller than 10 µm. Recent studies have shown…
Using experimentally established sequence of extractions, we were able to fractionate regioregular poly(3-hexylthiophene) (R-P3HT) into four fractions differing significantly in their molecular weight (Mn) and exhibiting low polydispersity coefficients. 1H NMR analysis of low molecular fractions enabled us to propose…
The behavior of chromate conversion coatings (CCCs) on the aluminum aircraft alloy AA 2024‐T3 was examined by several types of experiments, using Raman spectroscopy as a primary technique. First, Raman spectra of the CCC film made from a commercial process revealed a Raman feature characteristic of Cr(VI) which was di…
ABSTRACT Rice hulls, a waste coproduct of the rice industry, is composed of 20% silica. The objectives of this study were to develop a method to recover silica from rice hull ash and produce silica gel, and to determine the physical and chemical properties of the rice hull silica gel (RHSG) relative to Trisyl 300, a c…
The appearance of an extra arc in impedance spectra obtained on high performance solid oxide fuel cell (SOFC) anodes is recognized when experiments are conducted in a test setup where the working and reference electrodes are placed in separate atmospheres. A simple continuously stirred tank reactor (CSTR) model is use…
We report on a novel approach to the realization of nematic liquid-crystal (LC) phase correctors to form spherical and cylindrical wave fronts. A LC cell with a distributed reactive electrical impedance was driven by an ac voltage applied to the cell boundary to yield the desired spatial distribution of the refractive…
Using the example of nanoporous catalysts, we discuss the non-local density functional theory (NLDFT) model applied to physical adsorption of nitrogen and argon. The model has been used for predicting adsorption/desorption isotherms in nanopores of different geometries over a wide range of pore sizes (0.5–100 nm), and…
Polycrystalline samples of antimonides with the skutterudite crystal structure with La partially filling the voids have been prepared in an effort to quantify the impact of partial void filling on the lattice thermal conductivity of these compounds. It is observed that a relatively small concentration of La in the voi…
This review covers both the history and present state of the kinetics of thermally stimulated reactions in solids. The traditional methodology of kinetic analysis, which is based on fitting data to reaction models, dates back to the very first isothermal studies. The model fitting approach suffers from an inability to…
Poly(ethylene oxide) (PEO) polymer, in linear and star form, was covalently grafted to silicon surfaces, and the surfaces were tested for their ability to adsorb proteins. Linear PEG of molecular weight 3400, 10 000, and 20 000 g/mol and star PEO molecules were coupled via their terminal hydroxyl groups activated by t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPoly(Amidoamine) Dendrimer-Templated Nanocomposites. 1. Synthesis of Zerovalent Copper NanoclustersLajos Balogh and Donald A. TomaliaView Author Information Michigan Molecular Institute, 1910 W. St. Andrews Road Midland, Michigan 48640 Cite this: J. Am. Chem. Soc. 1998…
We solve exactly and describe in detail a simplified scalar model for the low frequency shear rheology of foams, emulsions, slurries, etc. [P. Sollich, F. Lequeux, P. H\'ebraud, and M. E. Cates, Phys. Rev. Lett. 78, 2020 (1997)]. The model attributes similarities in the rheology of such ``soft glassy materials'' to th…
Quantitative XPS has been used to determine the surface concentration of hydroxyl groups in native air-formed oxide films on metals having low surface areas. A mathematical expression has been derived to give the concentration of surface hydroxyl groups as a function of the intensity ratio of the OH to O2− contributio…
Abstract In the past few years, an enormous amount of work has been reported on the progress in the application of conventional fillers and the development of new products to improve the reinforcement of rubber, dynamic properties in particular. While all agree that the filler as one of the main components of the fill…