Materials Literature
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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…
Improvements in the shape determination method based on multipole expansion [Stuhrmann (1970), Z. Phys. Chem. (Frankfurt am Main), 72, 177–198] are described. Fast algorithms for evaluating shape scattering from the multiple coefficients are developed. The relationship between the resolution in real and reciprocal spa…
Eight different fibers were studied to examine upconversion as a function of erbium concentration below 1000 ppm by weight. These experiments and a computer model of two-particle upconversion made it possible to estimate the upconversion coefficient used in a rate-equation model. A strong correlation was found between…
The formation, lateral growth, and melting of crystals of polyethylene were studied. At pressure (P) 2-5 kbar and temp. (T) supercoolings ?10 Deg, all crystal growth occurred in the hexagonal (h) phase, and only in this phase, regardless of whether in the h or orthorhombic (o) stability regime of the P-T phase diagram…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization kinetics of random ethylene copolymersR. G. Alamo and L. MandelkernCite this: Macromolecules 1991, 24, 24, 6480–6493Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/do…
Polylysine covalently linked to moieties of gadopentetate (Gd-DTPA), for use as a macromolecular blood pool marker for contrast material-enhanced magnetic resonance imaging (MRI), was characterized by means of physicochemical measurements and pharmacokinetics in rats and rabbits and compared with Gd-DTPA. Gd-DTPA-poly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge transfer across oblique bisporphyrins: two-center photoactive moleculesAnne M. Brun, Anthony Harriman, Valerie Heitz, and Jean Pierre SauvageCite this: J. Am. Chem. Soc. 1991, 113, 23, 8657–8663Publication Date (Print):November 1, 1991Publication History Published onl…
Abstract The synthesis and utilization of electrodes modified with conducting polymers is reviewed. Specific issues evaluated include the various approaches available to produce the required functionality at the electrode surface and the practical considerations to be addressed during synthesis, both in terms of hardw…