Materials Literature
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Recent EPR and susceptibility measurements in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ support the existence of a bottleneck EPR regime up to 1000 K quantitatively. The EPR linewidth and electrical conductivity follow the same temperature dependence in the range of 250 to 650 K predicted b…
Due to a demand by the aerospace industry, NASA has begun developing the next generation of polyimide foams which could be utilized to reduce vehicle weight for the X-33 and Reusable Launch Vehicle (RLV) programmes. The activity at NASA Langley Research Center focuses on developing polyimide foam and foam structures w…
A third generation dendron possessing one activated vinyl group linked to the core and 16 chlorines linked to the surface has been functionalized with various groups at the core (primary amine, phosphine, or azide), and on the surface (aldehyde, tertiary amine, or nitrile). These functionalized dendrons are used as bu…
This study uses the molecular dynamics computational technique to investigate the thermal conductivity of solid thin films in the direction perpendicular to the film plane. In order to establish a benchmark reference, the computations are based on the widely used Lennard-Jones argon model due to its agreement with exp…
We have used atomic force microscopy to investigate the patterns obtained by isothermal crystallization of quasi-2-D monolayers of poly(ethylene oxide) adsorbed onto bare silicon wafers. These monolayers were prepared by a pseudo-dewetting process. Fingerlike branched structures were observed with a characteristic wid…
A low-temperature CVD process for thin-film magnet fabrication is reported here with a variety of rigid and flexible substrates (see also cover). These polymeric magnets have enhanced air stability with respect to those prepared from solution, and an opportunity is provided for the preparation of a broad range of patt…
Patterns of diatom species distribution in relation to total N (TN), total P (TP), and other environmental variables from riffle sites on 2 streams in southern Ontario, Canada, were determined using canonical correspondence analysis (CCA). Relationships with TN and TP were sufficiently strong to develop weighted-avera…
We present a systematic electron-spin-resonance (ESR) study in single crystals of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}(0<~x<~0.2).$ The temperature dependence of the ESR linewidth marks all significant transitions between both orthorhombic ${(O}^{\ensuremath{'}},O)$ and the rhombo…
Liquid-solid transition of Laponite suspensions at very low ionic strength: Long-range electrostatic stabilisation of anisotropic colloids, P. Levitz, E. Lecolier, A. Mourchid, A. Delville, S. Lyonnard
The dynamics of electronic energy transfer (EET) for a series of spherical porphyrin arrays based on different generations of poly(propylene imine) dendrimers have been investigated using time-resolved fluorescence anisotropy measurements (TRAMS) in a glass environment. The first, third, and fifth generation dendrimer…
Gel‐glasses of various compositions in the x ZrO 2 . (10 – x )SiO 2 system were fabricated by the sol–gel process. Precipitation due to the different reactivities between tetraethyl orthosilicate (TEOS) and zirconium(IV) n ‐propoxide has been eliminated through the use of 2‐methoxyethanol as a chelating agent. Thermal…
The Raman shifts as functions of pressure were measured for the radial breathing mode and tangential modes in carbon nanoropes containing (10,10) and (17,0) single-walled tubes. An abrupt decrease in the rate of change of the Raman shift with pressure for the tangential modes, and the disappearance of the radial breat…
The local water content in cementitious material depends on the equilibrium between its atmospheric environment and its bulk properties. So, the moisture profile in material can vary with time. The object of this study is to follow the change of this profile by measuring the electrical impedance of the material with p…
The concrete could be considered as a thick solid particles suspension in fine particles suspension. The rhealogy of the last one influences very hardly the concrete behaviour, so that the importance to realize an study concerning the mortars and pastes rheology. The first objective of this work has been to determine…
A comparison was made of the efficacy of two consolidants and two water repellents applied to samples of granite under optimum conditions, with the efficacy of the same products applied to the granite in the presence of soluble salts or water. The amount of product absorbed and the amount of dry polymer remaining afte…
The aim of this work is to characterize the ancient building materials (mud wall and adobe) of three churches in the province of Palencia. This is the first part of a study which seeks to evaluate how the mud walls of the tower of the church of Cisneros reacted to restoration treatment which consisted of a structural…