Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTChirality Information Transfer in Polylactides: From Main-Chain Chirality to Lamella CurvatureDamien Maillard and Robert E. Prud'hommeView Author Information Department of Chemistry, Université de Montréal, Pavillon J. A. Bombardier…
Infrared spectroscopy has emerged as a premier experimental technique to probe enigmatic effects arising from strong correlations in solids. Here we report on recent advances in this area focusing on common patterns in correlated electron systems including transition metal oxides, intermetallics and organic conductors…
A novel method coupling the Langmuir-Blodgett (LB) deposition of silica particles and the formation of a self-assembled monolayer (SAM) of alkylsilane is proposed for fabricating hydrophobic surfaces. The LB deposition and the SAM are supposed to confer the substrate surface roughness and low surface energy, respectiv…
The use of nanoparticles for the fabrication of new functional ceramics and composites often requires the preparation of concentrated fluid suspensions. However, suspensions containing nanoparticles are limited in solids content because of the excluded volume formed by the dispersant adlayer around the particles. We i…
A system is reported for evaporation-controlled crystal growth of potassium dihydrogen phosphate (KDP) from aqueous solution by the Sankaranarayanan−Ramasamy (SR) method. KDP (KH 2 PO 4 ) single crystals of 10-, 20-, and 40-mm diameter and 60-mm height have been grown at an average growth rate of 5 mm/day from the poi…
The band structure of the low-temperature thermoelectric material, $\mathrm{Cs}{\mathrm{Bi}}_{4}{\mathrm{Te}}_{6}$, is calculated and analyzed using the semiclassic transport equations. It is shown that to obtain a quantitative agreement with measured transport properties, a band gap of $0.08\phantom{\rule{0.3em}{0ex}…
Fully dense Si 3 N 4 sintered with rare‐earth (RE=La, Nd, Gd, and Yb) oxide additives were fabricated by hot pressing. They were mainly composed of the α‐phase, which enabled the investigation of the α–β transformation kinetics without the effect of porosity. The phase transformation kinetics was found to be linear. T…
We used transmission electron microscopy and magneto-optical Kerr effect measurements to investigate the chemical, structural, and magnetic properties of MnGe alloys fabricated by ion implantation of ${\mathrm{Mn}}^{+}$ at doses of $1\ifmmode\times\else\texttimes\fi{}{10}^{16}$, $2\ifmmode\times\else\texttimes\fi{}{10…
Abstract This work describes the effect of the speed of drum‐type rotating collector in an electrospinning process on the orientation of electrospun poly(butylene terephthalate) fiber mats, and its effect on the tensile properties. The degree of orientation increased with the increase in the drum speed (surface veloci…
D-amino acids are much less common than their L-isomers but are widely distributed in most organisms. Many D-amino acids, including those necessary for bacterial cell wall formation, are synthesized from the corresponding L-isomers by alpha-amino acid racemases. The important class of pyridoxal phosphate-independent r…
We present a detailed description for the metal-insulator transition in paramagnetic ${\mathrm{VO}}_{2}$. Based on recent experimental data we show the importance of multiorbital electron-electron interactions along with first-principles band structure data for a consistent description of the metal-insulator transitio…
Hafnium carbide (HfC)‐(5, 10, and 20 vol%) MoSi 2 ceramics were pressureless sintered at 1950°C in an argon flux. The materials had nearly full density (96%–98%), with mean grain sizes in the range of 3–4 μm. Depending on the MoSi 2 amount (5–20 vol%), the mechanical properties were in the following ranges: hardness 1…
Schiff base derivatives of the biometals (Zn, Mg, Ca) in the presence of anion initiators have been shown to be very effective catalysts for the ring-opening polymerization of trimethylene carbonate (TMC or 1,3-dioxan-2-one) to poly(TMC) devoid of oxetane linkages. The order of catalytic activity as a function of meta…
Fast and efficient metrology tools are required in microelectronics for control of ever-decreasing feature sizes. Optical techniques such as spectroscopic ellipsometry (SE) and normal incidence reflectometry are widely used for this task. In this work we investigate the potential of spectral Mueller polarimetry in con…
Close-packed tubes: The right choice of metal alloy substrate combined with an adapted anodization can result in self-organized, uniformly aligned nanotubes in two discrete size ranges as is shown in this communication. Using this technique, mixed-oxide nanotubes with novel shapes (see figure) have been obtained.
The frequency dependent conductivity and permittivity of a ceramic composite are modelled using electrical networks consisting of randomly positioned resistors and capacitors. The electrical network represents a heterogeneous microstructure that contains both insulating (the capacitor) and conductive regions (the resi…
On the Q-dots: Fluorescent polystyrene beads loaded with CdTe quantum dots exhibit excellent pH-independent fluorescence and antisolvent properties (see figure). The beads, which were prepared by miniemulsion polymerization using polymerizable surfactants as both an emulsifier and a phase-transfer agent, offer excelle…
Solidification of the liquid medium in ceramic suspensions containing less than a critical volume fraction powder leads to the formation of particle‐free dendrites of the frozen medium. These particle‐free dendrites create, after sublimation of the frozen vehicle, large dendrite pores. We define the conditions under w…
By now more than 100 years passed since Paul Drude suggested his highly acclaimed model of electronic transport. In the form advanced by A. Sommerfeld, the Drude model is still heavily utilized to describe, for instance, the optical properties of metals. Surprisingly, the key prediction of the Drude model, the frequen…
Etching polymer‐derived silicon‐oxycarbide ceramics with hydrofluoric acid creates nanoporous structures of specific surface areas as high as 600 m 2 /g. The change in composition upon etching shows the removal of silica, not carbon. The structure remaining after etching is postulated to consist of a scaffolding of gr…