Materials Literature
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The detonation of carbon- or nitrogen-containing explosives not only produces powerful shock waves but also provides elemental building blocks and a unique high-pressure and high-temperature physical environment for the construction of various nanostructures. This review highlights the situation and key progresses in…
Four new pregnane glycosides, named marstenacissides A (1), B (2), C (3), and D (4), have been isolated from the stems of Marsdenia tenacissima. Their structures were established on the basis of chemical and spectral methods.
We study a model of carbon nanotube with a half filled conduction band. At this filling the system is a Mott insulator. The Coulomb interaction is assumed to be unscreened. It is shown that this allows to develop the adiabatic approximation which leads to considerable simplifications in calculations of the excitation…
For NiTi shape memory alloys, powder metallurgical (PM) processes are pioneering production routes. One promising route for the PM fabrication of NiTi compacts is Hot Isostatic Pressing (HIP). For the present investigation, cost‐effective elemental powder mixtures as well as high‐purity prealloyed NiTi powders were us…
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Despite of their successes, the results of first-principles quantum mechanical calculations contain inherent numerical errors that are caused by inadequate treatment of electron correlation, incompleteness of basis sets, relativistic effects or approximated exchange-correlation functionals. In this work, we develop a…
Materials exhibiting gas permeable porosity are of particular interest for a number of functional applications. Here, the authors show a new nanoporous superalloy membrane, far surpassing existing gas permeable porous metals in fineness and regularity of the porosity. This may not only open the path for new medical ap…
Simulations of nanocrystalline materials reveal that the pressure gradient present within the structure can play a key role in the movement of self-interstitial atoms (SIA's) to surrounding grain boundaries and therefore in the resulting defect structure formed during displacement cascades. Initially SIA's sense the g…
Here, we introduce the synthesis, characterization, and surface orientation properties of a new generation of biodegradable and biomimetic polymers. These phospholipid-mimetic, biodegradable polymers are synthesized by combining poly ε-caprolactone (PCL) with various functional polar end-groups, including zwitterionic…
Multiple-walled carbon nanotubes (MWNTs) were chemically modified by a ligand-exchange reaction of ferrocene (Cp-Fe-Cp). The modified MWNTs (Cp-Fe-MWNTs) were next monolithiated by tert -butyllithium and terminated by p -chloromethylstyrene ( p MS). The p MS - terminated species ( p MS-Cp-Fe-MWNTs) were then functiona…
Scanning tunneling microscopy studies of vanadium oxides grown on Pd(111) show interesting structures especially in the low-coverage region. Evaporation of V in an oxygen background at elevated sample temperature $(250\ifmmode^\circ\else\textdegree\fi{}\mathrm{C})$ results in the formation of a nonperiodic honeycomb-l…
Surface structures of asymmetric poly[styrene- block -4-(perfluorooctylpropyloxy)styrene] block copolymers (PS−PF) with the shorter PF block than the PS block have been investigated using X-ray photoelectron spectroscopy (XPS) and dynamic secondary ion mass spectrometry (SIMS). Fluorooctyl side groups (C 8 F 17 ) of t…
Two aspects of the deformation behavior of magnesium sheets are the subject of this paper. First it will give a mechanical characterization of a commercial magnesium with a focus on the anisotropy and the possible microstructural causes of this behavior. The rolling process will be part of the second aspect. The aim i…
Abstract Development of magnesium die casting alloys is the art of combining a thorough understanding of thermodynamic aspects of alloy composition and phase formation with the solidification kinetics as experienced in the die casting process. The microstructures obtained will determine The Alloy Property profile, whi…
Simulations of the optical absorption in bismuth nanowires resulting from an indirect interband $L\ensuremath{-}T$-point transition are presented. The absorption dependence at room temperature on the band overlap, effective masses, and wire diameter is explored. The polarization, wave number, and wire size dependence…
Thin films of the perchlorate salt of an [Os(N,N'-alkylated-2,2'-biimidazole3)2+/3+-containing polymer have been formed on planar platinum microelectrodes. The electrochemical response associated with the Os2+/3+ couple occurs at -0.19 V. In aqueous perchlorate media at near-neutral pH the voltammetric response is clo…
The dynamic density functional (DDF) theory and standard Brownian dynamics simulations (BDS) are used to study the drifting effects of a colloidal particle in a polymer solution, both for ideal and interacting polymers. The structure of the stationary density distributions and the total induced current are analyzed fo…
Amphiphilic, diblock copolypeptides of hydrophilic lysine or glutamic acid and hydrophobic leucine or valine have been observed to self-assemble into rigid hydrogels in aqueous solution at neutral pH and very low volume fraction of polymer, > or =0.5 wt % polypeptide. Laser scanning confocal microscopy and ultra small…
A model for the structure of amorphous molybdenum trisulfide, a-MoS3, has been created using reverse Monte Carlo methods. This model, which consists of chains of MoS6 units sharing three sulfurs with each of its two neighbors and forming alternate long, nonbonded, and short, bonded, Mo-Mo separations, is a good fit to…
The spreading of polymer droplets is studied using molecular dynamics simulations. To study the dynamics of both the precursor foot and the bulk droplet, large hemispherical drops of 200 000 monomers are simulated using a bead-spring model for polymers of chain length 10, 20, and 40 monomers per chain. We compare spre…