Materials Literature
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Polyacrylate-capped Pt nanocrystallites of 2.5 ± 0.6 nm diameter were synthesized by reduction of Pt(IV) with citrate in the presence of polyacrylate and were self-assembled layer-by-layer in poly(diallyldimethylammonium chloride) by virtue of the Coulombic attraction between the negatively charged capping agent and t…
We have investigated the solid-state photobehavior of a broad set of pyridine-3-carboxaldehydes 1-5. The introduction of a heteroatom into mesitaldehydes as in aldehydes 1 raises the question of conformational preference in the solid state. The preferred conformations have been unequivocally established from X-ray cry…
Flax fibers composed mainly of cellulose were subjected to heterogeneous valerylation reaction. The progress of the chemical modification was assessed by transmission FTIR. The heterogeneous esterification reaction followed first-order kinetics, and a plateau was reached already after 30 min. The intensity of the FTIR…
This paper focuses on the preparation and characterization of a titanium−tin mixed oxide (Ti,Sn)O 2 with anatase structure. The preparation method is based on a sol−gel technique using titanium tetra-isopropoxide and tin tetrachloride as precursors. The obtained TiO 2 and titanium−tin mixed oxide xerogels and their he…
Mode coupling theory (MCT) is used to model gel formation in mixtures of colloidal particles and nonadsorbing polymer. The polymer induces an effective, short-range attraction among the colloids, which is modeled by a depletion attraction of the Asakura−Oosawa form. This enables the MCT to be solved analytically for d…
Block copolymers, easily tailor-made by growing poly(ethylene oxide) from a commercial hydroxyl-terminated poly(ethylene- co -butylene) (Kraton liquid), can self-assemble over a wide range of concentrations into mesophases constructed from spherical micelles with small polydispersity. These phases are analyzed in deta…
The paper deals with the interpretation of the Mn 2+ EPR spectra in the high-temperature phase of MgSiF 6 ·6H 2 O. Two models are presented: the continuous and the discrete antiphase domain walls. Just above the ferroelastic phase transition, for each resonance transition two EPR lines are observed: the broad one and…
Eine eiserne Konstitution: Dunkle superparamagnetische Eisenoxid-Nanopartikel befinden sich innerhalb der Wände eines hexagonalen mesoporösen Alumosilicats (siehe zugehörige Hellfeld-TEM-Abbildung). Der einfache Eintopfansatz, der auf der Selbstorganisation von Blockcopolymeren beruht, hat das Potenzial für Anwendunge…
The doublet anionic states of TCNQ-F4 (2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) have been studied at the Hartree−Fock and the Møller−Plesset (MP) perturbation theory levels (up to fourth order) with aug(sp)-pVDZ basis sets. Our results indicate that TCNQ-F4 forms a stable anion of B 2g symmetry whose vert…
Arabinoxylans (AXs) are byproducts of the cereal milling industry. To obtain high-value products, AXs have been used as a film-forming agent. Hence, AX-based films are poor water vapor barriers. The objectives of this study were to graft omega-3 (omega3) fatty acids onto AX polymeric chains by using two new technologi…
Dielectric constants $({\ensuremath{\epsilon}}^{\ensuremath{'}},$ ${\ensuremath{\epsilon}}^{\ensuremath{''}})$ and switching current transients of $\mathrm{Pb}({\mathrm{Zr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}){\mathrm{O}}_{3}$ thin films are measured for mixing concentrations of $x=0.46,$ 0.48, and 0.49 in the morpho…
The removal of a key residue (Arg 90) from the chorismate mutase enzyme destroys the balance of the interactions in the active site required for stabilizing the conformation of the transition state in the Claisen rearrangement of chorismate to prephenate (see picture).
Novel dendritic mixed-valence dinuclear ruthenium complexes were prepared and chemically cross-linked to form thin films on ITO electrodes. The cross-linked films exhibited an excellent electrochromism in the near-infrared (NIR) region and optical attenuation of 5.4 dB/μm in thickness at 1550 nm with a switching time…
Die Konfiguration der 1,2-Cyclohexandiol-Zwischenstufe spielt eine entscheidende Rolle hinsichtlich der Geschwindigkeit und der Selektivität der Bildung von Adipinsäure aus Cyclohexen in einer lösungsmittelfreien Synthese. Ein Titan-haltiges Aluminophosphat-Molekularsieb (TAPO-5) erwies sich als effizienter heterogene…
The usage of hollow poly(styrenesulfonate)/poly(allylamine hydrochloride) polyelectrolyte capsules for the selective precipitation of YF 3 from water solution was described. Weakly crystallized YF 3 particles of 6−9 nm diameter were synthesized exclusively inside the restricted volume of the polyelectrolyte capsule an…
Ein scharfes Maximum in der Struktur-Aktivitäts-Beziehung, ein überraschend starker Einfluss der hydrophoben Teilstruktur auf DNA-Bindung und -Transport und ein ungewöhnlicher Serum-Effekt auf die relativen Transfektionsaktivitäten wurden in ersten biologischen Studien an einer Serie von vier amphiphilen Dendrimeren g…
Langsame Relaxation des Paramagnetismus der Titelverbindung bei niedrigen Temperaturen in Wechselstrom-Suszeptibilitätsmessungen, belegt durch ein frequenzabhängiges phasenverschobenes Signal (χ, siehe Bild), demonstriert überzeugend, dass dieser Cluster ein seltenes Beispiel für einen Cyanid-verbrückten Einzelmolekül…
The nickel coordination chemistry of a series of polytopic diazine (N-N) based ligands has been examined. Self-assembly reactions lead to examples of dinuclear, trinuclear, tetranuclear, pentanuclear, and octanuclear complexes, all of which exhibit magnetic exchange coupling, with antiferromagnetic and ferromagnetic e…
We investigate an all solid-state thin-film microsupercapacitor (TFSC) fabricated with tungsten cosputtered ruthenium oxide electrodes (W-RuO2) and LiPON electrolyte. It is shown that the room-temperature charge–discharge behavior of the TFSC is similar to that of a bulk-type supercapacitor. It is also shown that the…
The stable magnetization configurations of a ferromagnet on a quasiperiodic tiling have been derived theoretically. The magnetization configuration is investigated as a function of the ratio of the exchange to the dipolar energy. The exchange coupling is assumed to decrease exponentially with the distance between magn…