Materials Literature
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A ferrite left-handed transmission line has been proposed and investigated for the first time, which is composed of a ferrite microstrip line loaded periodically with capacitances and inductances. The nonreciprocal transmission characteristics with the isolation of greater than 20 dB are numerically obtained by finite…
The mechanism and controlling factors of polymorphic crystallization were investigated using amino acids and a thiazole derivative (BPT) (pharmaceutical). The controlling factors depend on the system and crystallization method. In the cooling crystallization of amino acids, supersaturation hardly influenced the crysta…
Abstract An aluminum/Schiff base complex {[2,2‐dimethyl‐1,3‐propylenebis(3,5‐di‐ tert ‐butylsalicylideneiminato)](isopropanolato)aluminum(III) ( 2 )} based on a bulky ligand and aluminum isopropoxide was prepared and employed for the stereoselective ring‐opening polymerization (ROP) of rac ‐lactide ( rac ‐LA). The ini…
The author offers a counter argument for the use of the term pseudopolymorphism. He argues that the term polymorph should ideally be restricted to crystals of a single compound. However, he notes that in multicomponent crystals there are too many structural variations and the term polymorphism is unnecessarily restric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting Organic Radical Cation Salts with Organic and Organometallic AnionsUrs Geiser and John A. SchlueterView Author Information Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue Building 200, Argonne, Illinois 60439 Cite this: Chem. Rev. 2…
We report a novel approach for growing aligned and orientation-ordered ZnS nanowires. Our method relies on a buffer layer of CdSe grown on a Si(111) substrate, on which ZnS nanowires are grown. The growth process of the nanowire bundles is presented. The technique demonstrated could be an effective pathway for growing…
A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by 1 H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer fo…
Raman microscopy has been applied to study the preparation of shaped Mo/Al(2)O(3) catalysts. The speciation of different Mo complexes over gamma-Al(2)O(3) support bodies was followed in time after pore volume impregnation with aqueous solutions containing different Mo complexes. The addition of NO(3-) to the impregnat…
This article is a tutorial on Markov chain Monte Carlo simulations and their statistical analysis. The theoretical concepts are illustrated through many numerical assignments from the author's book on the subject. Computer code (in Fortran) is available for all subjects covered and can be downloaded from the web.
We investigate the effects of carbon and boron doping on the thermal expansion in the hexagonal (P63/mmc) intermetallic YbGaGe. X-ray powder diffraction was used to measure the lattice constants on pure and doped (C or B at nominal levels of 0.5 %) samples from T~10 K to T~300 K. Also measured were resistivity, specif…
Magnetic semiconductors have attracted interest because of the question of how a magnetic metal can be derived from a paramagnetic insulator. Here our approach is to carrier dope insulating FeSi and we show that the magnetic half-metal which emerges has unprecedented optical properties, unlike those of other low carri…
Understanding energetics and mechanism of protein-protein association remains one of the biggest theoretical problems in structural biology. It is assumed that desolvation must play an essential role during the association process, and indeed protein-protein interfaces in obligate complexes have been found to be highl…
We consider microscopic contact states of a drop deposited on textured rough surfaces. The energies of three possible (meta)stable wetting states are compared and the lowest energy state is regarded as the "phase". We present the "phase diagrams" in the two-dimensional space of texture parameters, which suggests trans…
We report here the synthesis and self-assembly of a series of three molecules with dendron rodcoil architecture that contain conjugated segments of oligo(thiophene), oligo(phenylene-vinylene), and oligo(phenylene). Despite their structural differences, all three molecules yield similar self-assembled structures. Elect…
This study deals with the influence of processing induced crystalline orientation on the macroscopic deformation and failure behavior of thin samples of polyethylene and polypropylene. Distribution and structure of flow-induced orientations were characterized by optical microscopy, X-ray diffraction techniques, and tr…
A detailed study on bromination and subsequent imidization of perylene bisanhydride with cyclohexylamine is reported. The present results reveal that previously reported 1,7-difunctionalized perylene bisimides are presumably contaminated with the respective 1,6 regioisomers. N,N'-Dicyclohexyl-1,7-dibromoperylene bisim…
In this work, the suitability of imidazolium-based ionic liquid solvents is investigated for the dissolution and regeneration of silkworm (Bombyx mori) silk. Within an ionic liquid the anion plays a larger role in dictating the ultimate solubility of the silk. The dissolution of the silk in the ionic liquid is confirm…
In order to obtain high reflectance of EUV and X-ray multilayer mirrors, highly polished substrate surfaces with rms roughness σ<sub>rms</sub> = 0,1-0.2 nm are necessary. However, the simultaneous achievement of low micro-roughness and precise surface figure is very challenging and often not accomplished. Theref…
A number of X-ray astronomical missions of near future (Constellation-X, XEUS, Simbol-X) will make use of hard X-rays (10-100 keV) optics with broad-band multilayer coatings. A possible technique under development is based on an extension of the already tested replication of a coated mandrel by e-beam deposition and n…
We have investigated the energetics of hydrogen site occupation in LaNi5Hn (hexagonal P63mc structure) and LaCo5Hn (orthorhombic Cmmm structure) via calculation of the site-dependent enthalpies of hydride formation ΔH. For each structure ΔH was determined for a broad variety of hydrogen configurations. In LaNi5Hn(LaCo…