Materials Literature
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Aqueous solutions of α-cyclodextrin (α-CD) and polyethylene glycol (PEG) form interesting complexes, where several α-CD units are penetrated by the linear polymeric PEG chain and produce a so-called “polyrotaxane”. This supramolecular structure is stabilized by strong interactions between the α-CD hydrophobic internal…
The effect of Keggin heteropolyoxotungstates (XW 12 O 40 n - with X = H 2, P, Si, B or Co) on Langmuir films has been studied for monolayers of DODA (dimethyldioctadecylammonium) and DPPC (1,2-dipalmitoyl- sn -glycero-3-phosphorylcholine). Marked modifications of the compression isotherms have been observed when the K…
Three approaches for the synthesis of dendrimers with poly( p -phenylene)-PPP derived cores are described. The respective limitations of these approaches are assessed in view of the goal of this research: to make available structurally perfect, high molecular weight polymers with a dense sequence of sterically demandi…
Abstract A catalytic system consisting of sodium tungstate dihydrate, (aminomethyl)phosphonic acid, and methyltrioctylammonium hydrogensulfate, effects the epoxidation of olefins using 30% hydrogen peroxide with a substrate-to-catalyst molar ratio of 50—500. The reaction proceeds in high yield without solvents, or, al…
Size-dependent structural and dynamic properties of CdS nanocrystals with 13−120 Å diameter and of molecular crystals consisting of three-dimensional superlattices of these nanoparticles have been determined by extended X-ray absorption fine structure spectroscopy (EXAFS) at the Cd K edge at temperatures between 5 and…
The tensile creep behavior of two rare‐earth dopant systems, lanthanum‐ and yttrium‐doped alumina, are compared and contrasted in order to better understand the role of oversized, isovalent cation dopants in determining creep behavior. It was found that, despite some microstructural differences, these systems displaye…
The heterogeneity of urinary degradation products of C-terminal telopeptides derived from the alpha1 chain of human type I collagen was investigated and characterized. The urinary fragments characterized in this study consisted of two cross-linked (X) amino acid sequences derived from the C-terminal telopeptide (alpha…
Systematic Mn K-edge x-ray-absorption spectroscopy (XAS) measurements on samples of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Ca}}_{\mathrm{x}}$${\mathrm{MnO}}_{3}$ are reported. Detailed results on the chemical shift and pre-edge feature spectral strength (both indicators of the Mn d-hole count) a…
The effect of the substitution for Mn with Al in the magnetoresistive perovskite ${\mathrm{La}}_{2\mathrm{/}3}$${\mathrm{Ca}}_{1\mathrm{/}3}$${\mathrm{MnO}}_{3}$ has been studied by preparing the series ${\mathrm{La}}_{2\mathrm{/}3}$${\mathrm{Ca}}_{1\mathrm{/}3}$${\mathrm{Mn}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\m…