Materials Literature
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It is shown that the relevant spectral features which arise in the infrared spectrum of poly(3-methylthiophene) upon chemical doping or photoexcitation (i.e., in the electrically conducting form) can be properly explained by means of the effective conjugation coordinate (ECC) formalism. This theoretical dynamical mode…
A variety of monosulfonated phthalocyanine, benzonaphthoporphyrazine and porphyrin derivatives have been prepared as single positional isomers in moderate to high yield using modified Meerwein reaction conditions. These amphiphilic dyes have a potential application as photosensitizers in the photodynamic therapy of ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of DNA binding to electrically conducting polypyrrole filmsDaniel S. Minehan, Kenneth A. Marx, and Sukant K. TripathyCite this: Macromolecules 1994, 27, 3, 777–783Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue…
Discover what constitutes a composite material, how a composite is made, when a composite is best for a given application, how a composite material or structure responds to a thermal or mechanical load, and how to design a polymer composite that meets a set of property requirements. A general reference book for practi…
Existing matrix models for transformers reproduce specified short-circuit tests, portraying leakage flux in air, but do not explicitly model the core. Therefore, a precise relation between core flux and air flux is not clearly established. Core representation is defined simply on the basis of a specified excitation cu…
Zirconium alloys are susceptible to a stable cracking process called delayed hydride cracking (DHC). DHC has two stages: (a) crack initiation that requires a minimum crack driving force (the threshold stress intensity factor, KIH) and (b) stable crack growth that is weakly dependent onKl,. The value of KIH is an impor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of (Z)-1,3-pentadiene with CpTiCl3/MAO. Effect of temperature on polymer structure and mechanistic implicationsGiovanni Ricci, Salvatore Italia, and Lido PorriCite this: Macromolecules 1994, 27, 3, 868–869Publication Date (Print):January 1, 1994Publication His…
Festschrift remark-It was an honor to be invited to honor Allan Hoffman on the occasion of his 60th birthday. It seems like yesterday that Allan and I shared an office in old Building 12 on the M.I.T. campus. At that time Allan had lost a bout with a snow covered mountain while on skis, and consequently moved about aw…
β-Bromoporphyrins undergo Suzuki cross-coupling reactions with aryl boronic acids to give β-arylporpyrins in high yields and X-ray analysis shows that H2TPP(Ph)42a(TPP = tetraphenylporphyrin) is centrosymmetric and possesses a hydrogen-bonded inner core.
ABA block copolymers of polyethylene glycol and poly-DL-lactic acid were prepared by ring-opening polymerization of DL-dilactide with alpha,omega-dihydroxy polyethylene glycol, Mn 1000 or 2000. The morphology of the resulting copolymers, with PEG:PLA ratios(mol/mol) of 1:2, 1:3 and 1:4, was characterized by DSC and ES…
A new kind of PbS nanoparticles/polymer composite is synthesized whose microstructure observed under TEM proves that the nanoparticles are well dispersed and even in size; electron diffraction results identify the PbS nanoparticles to be of the cubic rock salt structure, and the particle size can be varied from 4 to 1…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
X-ray photoelectron spectroscopy (XPS) has been used to characterise the short range structure of iron phosphate glasses. Quantitative Fe 2+ /Fe 3+ ratios determined by decomposing the Fe3p spectra are in good agreement with valence measurements made by Mossbauer spectroscopy. Fe 2+ is preferred when [Fe]/[P] is low,…
Nine iron chelators were tested in five systems for their effects on radical-generation and conversion at chelator: iron molar ratios from 0.1 to 10. Stimulatory actions might distinguish toxic from safer chelators. Radical-generating reactions which represent different aspects of iron (ferrous and ferric) availabilit…
Ni-Cu-Zn ferrite co-fired with Ag internal conductor below 900/spl deg/C is very important for achieving a good quality and cost effective multilayer chip inductor. In this work, optimized processes were obtained to reduce the sintering temperature without deterioration of magnetic properties of ferrite. The main comp…
This work presents a quantitative comparison between experiment and molecular dynamics simulations for the excitation spectra of large van der Waals clusters. The emission and excitation spectra of mixed Ba(Ar)n clusters have been obtained for average cluster sizes ranging between 300 and 4000. The simulation is perfo…
Abstract The relationship between two anharmonic physical properties is considered: the bulk‐modulus temperature dependence (1/ B ) (∂ B /∂ T ) and the thermal expansivity (1/ V ) (∂ V /∂ T ). For the first, Varshni's relationship is used, which derives from an Einstein‐oscillator model of crystals. For the second, a…
Growth conditions for Bi1−xLnxFeO3 (Ln˭La, Nd, Sm, Gd, Dy) crystals have been determined. Polymorphism, polar and magnetic properties of several structures have been studied. The quadratic magnetoelectric effect is found in rhombohedra1 and triclinic crystals with x < 0.25. The linear magnetoelectric effect is observe…
Plant fibers have a strength per unit weight similar to those of man-made fibers. Although plant fibers are successfully used in a limited number of composite products at the moment, the advantages of plant fibers, and the diverse fiber properties provided by nature, are such that plant fibers are likely to become mor…
The surface of polyimide film, Kapton® H, was modified with Ar, N2, NO, NO2, O2, CO, and CO2 plasmas to improve its adhesion to evaporated copper. The plasma treatments led to bond scission of the imide groups in the Kapton film to form carboxyl and secondary amide groups, and, as a result, the surface of the Kapton f…