Materials Literature
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A kinetic model is developed to simulate the thermal decomposition of dicumyl peroxide (DCP) in cumene with and without oxygen in the reacting system, based on a reaction network that is comprised of a set of 51 reactions. An optimization procedure is adopted to obtain the best estimates for most of the related kineti…
We have developed novel gold-silver alloy nanoshells as magnetic resonance imaging (MRI) dual T1 (positive) and T2 (negative) contrast agents as an alternative to typical gadolinium (Gd)-based contrast agents. Specifically, we have doped iron oxide nanoparticles with Gd ions and sequestered the ions within the core by…
Abstract The electrical conductivity of zinc ferrite (ZFO) thin films can be tuned over 7 orders of magnitude. The conductivity is thermally induced with two activation energies around 40–55 meV and 70–130 meV. Doping of the ZFO films with 1 at% Si or Ge further increases the conductivity. The magnetic hysteresis show…
The carbonation process of a calcined Mg-Al layered double hydroxide (LDH) was systematically analyzed at low temperatures, varying the relative humidity. Qualitative and quantitative experiments were performed. In a first set of experiments, the relative humidity was varied while maintaining a constant temperature. C…
Click the switch: By using a photoswitchable click amino acid (PSCaa) a light-induced intramolecular thiol-ene click reaction with a neighboring cysteine under very mild conditions results in an azobenzene bridge. By expanding the genetic code for PSCaa the specific incorporation of photoswitch units into proteins in…
Stable high internal phase emulsions (HIPEs) with the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)imide as dispersed phase were prepared and polymerised thermally into polyHIPEs. All polyHIPEs exhibited pore morphologies similar to that of polyHIPEs obtained with an aqueous dispersed phase. P…
Zeolite Y films (0.35-2.5 μm), into which CdS and PbS quantum dots (QDs) were loaded, were grown on ITO glass. The CdS QD-loaded zeolite Y films showed a photovoltaic effect in the electrolyte solution consisting of Na(2)S (1 M) and NaOH (0.1 M) with Pt-coated F-doped tin oxide glass as the counter electrode. In contr…
ABSTRACT Poly(ethylene‐co‐vinyl acetate) (EVA) is the primary polymer used for encapsulation of photovoltaic (PV) modules. Its degree of cross‐linking (gel content) is taken as a major quality reference. The EVA gel content is normally measured by Soxhlet extraction and more recently also by Differential Scanning Calo…
The electronic structure and phonon density of B(13)B(2) boron carbide calculated by Calandra et al (2004 Phys. Rev. B 69 224505) defines this compound as metallic, and the authors predict superconductivity with T(C)s up to 36.7 K. Their results are affected by the same deficiencies as former band structure calculatio…
Absorption spectra of Mn 2+ -doped ZnO quantum dots have been studied with the linear-response time-dependent density functional theory. Spectral changes caused by excited state dopant-carrier and dopant–dopant magnetic exchange couplings are investigated. The excitonic transition maximum shifts to higher energy and d…
Transparent films of layered double hydroxides (LDH) have been prepared by the deposition of their chloroform dispersions. The advantage of this method is the potential to obtain large and transparent self-standing films, composed of highly ordered LDH platelets, with durability that allows further modifications by an…
We studied the optical properties of poly(ethylene terephthalate) ion track membranes of 1.5, 0.5 and 0.05 µm pores impregnated with luminescent semiconductor CdSe/ZnS nanocrystals of different diameters (2.5 and 5 nm). The nanocrystals were embedded from their colloidal solutions in toluene by the immersion of a memb…
Kern-Schale-Schale: Die stufenweise Oberflächenbeschichtung monodisperser Polystyrol(PS)-Nanokügelchen mit einem phenolhaltigen Polymer (PF) und mit Siliciumdioxid resultiert in dualen PS@PF@SiO2-Kern-Schale-Strukturen (siehe Bild), deren Pyrolyse einheitliche, diskrete und dispergierbare hohle Kohlenstoff-Nanokügelch…
We use quantum-chemical density functional theory calculations to elucidate the origin of spin-crossover pathways in two iron(II) [2×2] molecular grids with carbohydrazide-based bridging ligands. The complexes are characterized energetically and structurally in five available spin states. Special attention is paid to…
The electronic properties of a graphene monolayer in a magnetic and a strain-induced pseudomagnetic field are studied in the presence of spin-orbit interactions (SOIs) that are artificially enhanced (e.g., by suitable adatom deposition). For the homogeneous case, we provide analytical results for the Landau level eige…
We demonstrate that electron irradiation of colloidal CdS nanorods carrying Au domains causes their evolution into AuS/Cd core/shell nanoparticles as a result of a concurrent chemical and morphological transformation. The shrinkage of the CdS nanorods and the growth of the Cd shell around the Au tips are imaged in rea…
Shiny particles: A newly synthesized BODIPY dye displays unusual dual emission and can be used to functionalize highly monodisperse PbS nanoparticles (see picture; B pink, F green, O red, C gray, H white). Electronic communication between the BODIPY dye and the PbS NPs can be exploited in a photovoltaic cell.
The first-order spin-reorientation transition in the Mn-substituted yttrium orthoferrites, YFe(1-x)Mn(x)O(3) (x = 0.1, 0.15 and 0.2), has been investigated using (57)Fe Mössbauer spectroscopy. Owing to its large anisotropy, substitution of Mn(3+) ions in YFeO(3) induces a spin-reorientation transition from the low-tem…
We describe the synthesis and structure–property relationships of two branched electroactive monomers containing carbazole core, 2,5-di(2-thienyl)-1 H -pyrrole, differentiated by the length of side alkyl chains (DSNSC-1 and DSNSC-2). Structural identification of initial compounds and products were carried out by using…
In this short review, we focus on the recent developments within the field of coordination chemistry where mono- or multimetallic supramolecular self-assemblies are formed by employing structurally defined organic ligands, taking advantage of the high coordination requirements of the lanthanides. Such synthesis result…