Materials Literature
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Abstract The field of thermoplastic elastomers has shown an explosive growth with the successful commercialization of elastomeric alloys (EAs) in 1981, based on the original work of Coran, Das, and Patel on dynamic vulcanization and the discovery of preferred cure system by Abdou-Sabet and Fath. These discoveries have…
The electron density function of rho (r) in a crystal determines its diffraction pattern, that is, both the magnitudes and phases of its X-ray diffraction maxima, and conversely. If, however, as is always the case, only magnitudes are available from the diffraction experiment, then the density function rho (r) cannot…
The NAC (nitrogen assimilation control) protein from Klebsiella aerogenes is a LysR-like regulator for transcription of several operons involved in nitrogen metabolism, and couples the transcription of these sigma 70-dependent operons to regulation by the sigma 54-dependent NTR system. NAC activates expression of oper…
Attachment of bacteria to surfaces is a common phenomenon in nature. Bacterial attachment represents an affiliation between the bacterium and the surface. There are three distinct stages in the accumulation of bacteria at a collecting surface viz. (1) adsorption, (2) consolidation and (3) colonisation. In the adsorpti…
An affine transformation model is applied to the diffusion coefficients of perfectly aligned and partially aligned ellipsoidal particles. It is tested against molecular dynamics simulations of hard ellipsoids, free to translate and rotate, in the nematic liquid crystal phase. The theory explains the variation with ord…
Transition metals such as Mo, W, Ta, Cr, and W can be used to significantly enhance the localized corrosion resistance of Al. Since these elements exhibit very low solubilities in aluminum, a nonequilibrium alloying method, such as sputter deposition, must be used to produce single‐phase alloys. The addition of approx…
Based on an order–disorder transition model and the calculation of coulombic electrostatic interaction of B‐site ions, an “ordering structure factor” F 0 is introduced. Consequently, an available criterion and diagram to predict the order–disorder transition of A(B′B″)O 3 is presented quantitatively. The theoretical r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural study of divalent metal bis(2-ethylhexyl) sulfosuccinate aggregatesC. Petit, P. Lixon, and M. P. PileniCite this: Langmuir 1991, 7, 11, 2620–2625Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 199…
The energetic behavior of two samples of soft magnetic materials fed by inverters has been studied. The authors dealt with the increase of the iron losses due to a nonconventional voltage supply. Six-step and PWM (pulse width modulated) inverter output voltages have been selected as the excitation waveforms for the sa…
For decades, organic polymers were important only as insulators in the electornic industries. Research on electroactive properties was confined mainly to inorganic materials such as barium titanate, lead zirconate titanate, quartz, silicon, cadmium sulfide, and gallium arsenide. In the 198s, organic polymers emerged a…
The onset of damage accumulation in ceramic‐matrix composites occurs as matrix microcracking and fiber/matrix debonding. Tension tests were used to determine the stress and strain levels to first initiate microcracking in both unidirectional and cross‐ply laminates of silicon carbide fiber‐reinforced aluminosilicate g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTManipulation of hydrophobic interactions in protein adsorptionRobert D. Tilton, Channing R. Robertson, and Alice P. GastCite this: Langmuir 1991, 7, 11, 2710–2718Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Novemb…
Dealloying of has been examined by in situ STM and several electrochemical methods. Three different regimes of behavior were noted. At low overpotentials, clustering of gold atoms occurs near sites of copper dissolution. This is essentially a two‐dimensional process. The formation and smoothing of these clusters by ca…
Abstract The influence of the spacer length was investigated for the correlation between the network anisotropy and the order parameter of the mesogenic units. Stress‐optical measurements show that a closer coupling of the mesogenic moieties to the polymer backbone results in an increased interaction between the mecha…
Inelastic-neutron-scattering and electron-microscopy studies were performed on single crystals of the cubic phase of ${\mathrm{Ni}}_{\mathit{x}}$${\mathrm{Al}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ alloys for x=50, 58, 62.5, and 63.9 at. %. The [110]-${\mathrm{TA}}_{2}$ phonon branch, corresponding to atomic displac…
A convenient method for the description of orientation data for cubic, hexagonal, tetragonal and orthorhombic crystals is given. The method can also be used for the representation of disorientation data, where disorientations between any two crystals of the specified symmetry lattices are considered. It is based on th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen chemisorption and laser Raman spectroscopy of unsupported and silica-supported molybdenum oxideA. N. Desikan, L. Huang, and S. T. OyamaCite this: J. Phys. Chem. 1991, 95, 24, 10050–10056Publication Date (Print):November 1, 1991Publication History Published online1 May…
ABSTRACT Thermal degradation of chlorophylls and chlorophyllides in spinach puree was studied from 100 to 145°C (2–25 min) for chlorophylls and from 80 to 115°C (2.5–39 min) for chlorophyllides. The derivatives formed were: pheophorbides, pyropheophorbides, pheophytins and pyropheophytins. Degradation kinetics of chlo…
A synthetic peptide that is 60 amino acids in length and corresponds to the homeobox sequence of antennapedia protein (pAntp) is specifically and efficiently captured by neurons in culture and conveyed to their nuclei. The internalization process is followed by a strong induction of neuronal morphological differentiat…
The relationships between the environments of cations in alkali silicates measured by X-ray absorption fine structure (XAFS) and magic angle spinning nuclear magnetic resonance (MASNMR) are considered. Both are consistent with the modified random network for glass structure in which modifiers form channels percolating…