Materials Literature
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In situ Raman spectroscopy allows for a detailed and time-resolved investigation of the kinetics of complex physical or chemical processes. Oxidation has become a frequently used method for the removal of disordered carbon species from carbon nanotubes. Oxidation, however, can also induce damage to the tubes and destr…
Confinement alters the energy landscape of nanoscale magnets, leading to the appearance of unusual magnetic states, such as vortices, for example. Many basic questions concerning dynamical and interaction effects remain unanswered, and nanomagnets are convenient model systems for studying these fundamental physical ph…
A convenient, aqueous-based synthesis of stable HgTe nanocrystals with widely size-tunable room temperature emission between wavelengths of 1.2 to 3.7 mum is demonstrated. By the choice of the thiols, applied as stabilizers, we optimized the growth dynamics, the luminescence quantum yields (up to 40%), and a ligand-ex…
Dynamic testing of statically predeformed specimens of magnesium (AM50) shows that the failure strain increases with the level of prestrain. Interrupted and other dynamic tests show that the temperature rise prior to localization has only a minor influence on adiabatic shear band (ASB) formation. For all the tests, th…
Three two-dimensional (2D) network compounds based on Mn(III)/Mn(II) tetranuclear single-molecule magnets (SMMs) connected by dicyanamide (dcn-) linkers have been synthesized: [Mn4(hmp)4(Hpdm)2(dcn)2](ClO4)2 x 2 H2O x 2 MeCN (2), [Mn4(hmp)4Br2(OMe)2(dcn)2] x 0.5 H2O x 2 THF (3), [Mn4(hmp)6(dcn)2](ClO4)2 (4), where Hhm…
The simple strategy of mixing phospholipid liposomes with charged nanoparticles and using sonication to mix them at low volume fraction produces particle-stabilized liposomes that repel one another and do not fuse. Subsequently, the volume fraction can be raised as high as approximately 50%, reversibly, still without…
Abstract A 3D thermoviscoelastic model is proposed to represent the thermomechanical behavior of shape memory polymers. The model is based on a physical understanding of the material behavior and a mechanical interpretation of the stress–strain–temperature changes observed during thermomechanical loading. The model is…
The rotating ring disk method is applied to investigate the oxygen reduction reaction on Ag single-crystal surfaces in alkaline solution over the temperature range 293-333 K. At all temperatures, the oxygen reduction reaction proceeds through the 4e- reaction pathway with a very small (approximately 0.5-2%) peroxide f…
We show that the usual sum of R-6 contributions from elements separated by distance R can give qualitatively wrong results for the electromagnetically nonretarded van der Waals interaction between nonoverlapping bodies. This occurs for anisotropic nanostructures that have a zero electronic energy gap, such as metallic…
Polyglycidols are flexible hydrophilic polyethers that are potentially biocompatible polymers based on their similarities to the well-studied poly(ethyleneglycol). Polyglycidols can be prepared as branched or linear polymers by suitable synthetic methods. Biocompatibility testing of these polymers conducted in vitro a…
Thermoluminescence properties of the Eu2+-, R3+-doped calcium aluminate materials, CaAl2O4:Eu2+,R3+, were studied above room temperature. The trap depths were estimated with the aid of the preheating and initial rise methods. The seemingly simple glow curve of CaAl2O4:Eu2+ peaking at ca. 80 degrees C was found to corr…
Abstract Owing to their unique mechanical properties, carbon nanotubes are considered to be ideal candidates for polymer reinforcement. However, a large amount of work must be done in order to realize their full potential. Effective processing of nanotubes and polymers to fabricate new ultra‐strong composite materials…
Abstract The effect of heat treatment on the damping behaviour of a Cu–11.9Al–2.5Mn (wt%) alloy was investigated and correlated with the martensite microstructures. It is found that elevated quenching temperature and rapid cooling can give rise to increased damping capacity due to the formation of favourable martensit…
On the basis of HF/6-31G(d) optimized structures, the nonplanar distortions of 135 polycyclic aromatic hydrocarbons (PAHs) have been classified as splitting (S-) and arching (A-) distortions. Three bay structures are proposed as the structural origin of S-distortion. Due to the limitation of sample molecules, a set of…
Une argile naturelle, la bentonite de Maghnia (ouest d’Algérie), a été purifiée et caractérisée par calcination, pH‑métrie, IR, XRD et SEM. Les résultats obtenus ont montré que l’argile a une conductance de 66,4 µS, une capacité d’échange cationique (CEC) de 0,91 méq/g et contient 12 % de matières organiques. Les cara…
Abstract Summary: Silvered polyimide films have been fabricated by direct ion exchange of a damp‐dry poly(amic acid) film with an aqueous silver solution such as silver nitrate. Thermal curing of the silver( I )‐containing films under tension leads to cycloimidization of the poly(amic acid) into polyimide with a conco…
The surface-directed spinodal decomposition (SDSD) in binary polymer mixture with different quench depths is investigated by numerical simulations, combining Cahn−Hilliard−Cook (CHC) theory with Flory−Huggins−de Gennes theory. The formation mechanisms of the wetting layer with different quench depths are discussed. Th…
A flick of a switch: The combination of fluorinated segments and oligo(dimethylsiloxane) units with bent mesogenic cores leads to new liquid-crystalline materials (see picture) that display a temperature-dependent change from ferroelectric to antiferroelectric switching. Such materials have potential use in, for examp…
Abstract A new dinuclear metal complex including tetrathiafulvalene (TTF) radicals as ligands has been prepared and characterized, [{DMT‐TTF(CONH 2 ) 2 } 2 Cu 2 Cl 6 ] ( 1 ), DMT‐TTF(CONH 2 ) 2 = o ‐bis(amido)‐appended dimethylthio‐tetrathiafulvalene. The compound is an uncommon example in which TTF radicals directly…
Abstract Two novel isophthalic diacid‐based monomers have been synthesized by inclusion in ring position 5 of a functionalized benzoylamine moiety. The functionalization includes a 12‐crown‐4 ether group fused with the benzene subunit and a dipodand substructure, formally a disubstitution of the benzene ring, with two…