Materials Literature
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Rigid chelates of high-molecular weight, [M(tpy-DTTA)2]6- (M = Fe, Ru), are obtained upon self-assembly around one M(II) ion of two terpyridine-based molecules substituted in the 4'-position with the polyaminocarboxylate diethylenetriamine-N,N,N'',N''-tetraacetate, tpy-DTTA4-. The protonation constants of tpy-DTTA4- (…
The stiffness and thermal expansion coefficient of ZrB2 are calculated within the density functional theory formalism. The stiffness tensor obtained here using the static finite strain technique is in good agreement with the results of resonant ultrasonic measurements and points to a possible misinterpretation of the…
We report the synthesis, optical, electrochemical, electronic structural, and transient optical properties of conjugated (porphinato)zinc(II)-spacer-(porphinato)zinc(II) (PZn-Sp-PZn) complexes that possess intervening conjugated Sp structures having varying degrees of proquinoidal character. These supermolecular PZn-S…
Immobilized Lipase B from Candida antartica (Novozyme 435) catalyzed bulk polycondensations at 70 °C for 42 h that resulted in hyperbranched polyesters with octanediol-adipate and glycerol-adipate repeat units. Instead of using organic solvents, the monomers adipic acid (A 2 ), 1,8-octanediol (B 2 ), and glycerol (B‘B…
We report an experimental and theoretical investigation of the growth and structure of large carbon clusters produced in a supersonic expansion by a pulsed microplasma source. The absence of a significant thermal annealing during the cluster growth causes the formation of disordered structures, where sp 2 and sp hybri…
We report on a study of quasi-ballistic transport in deep submicron, inhomogeneous semiconductor structures, focusing on the analysis of signatures found in the full nonequilibrium electron distribution. We perform self-consistent numerical calculations of the Poisson-Boltzmann equations for a model n(+)-n(-)-n(+) GaA…
We report scanning tunneling microscopy and ballistic electron emission microscopy studies of the electronic states of the uncovered and chemisorbed-oxygen covered surface of AlOx tunnel barrier layers. These states change when chemisorbed oxygen ions are moved into the oxide by either flood gun electron bombardment o…
Structure and dielectric characterization were performed on the (1-x)La(Mg1/2Ti1/2)O3 - xLa2/3TiO3 perovskite ceramics with the actual composition 0<=x<=0.52. The sequence of structure transformations was detected as x is increased: P21/n (0<=x<0.3) - Pnma (0.3<=x<0.37) - Imma (0.37<=x<0.4) - I2/a (0.4<=x<=0.49) - R-3…
It is shown that negative electric permittivity and magnetic permeability recently discovered in a photonic crystal in the vicinity of the Gamma-point are properties of propagating modes only. The evanescent modes rather decay than increase in the bulk of the crystal though they may be amplified by surface waves. If s…
Lanthanide(III) β-diketonate complexes (Ln = Nd, Sm, Eu, Gd, Tb, Er, Yb) were immobilized on a 1,10-phenanthroline (phen)-functionalized Merrifield resin (cross-linked chloromethylated polystyrene). 1,10-Phenanthroline was coupled to the polymer beads by nucleophilic displacement of the chlorine with 5-amino-1,10-phen…
We investigate the magnitude and temperature dependence of electrical conductivity, the optical and infrared absorption, and the Raman spectra of single-walled carbon nanotube (SWNT) bucky-paper after chemical treatment and determine the correlations between the changes in these properties. Ionic-acceptor doping of th…
A new strategy for the preparation of protein-functionalized polymer brushes is reported, which is based on a combination of surface-initiated atom transfer radical polymerization (ATRP), p-nitrophenyl chloroformate activation of the surface hydroxyl groups, and subsequent O(6)-benzylguanine (BG) functionalization. Th…
A simple procedure is described to incorporate gold nanoparticles and control their location within symmetric poly(styrene-b-2 vinyl pyridine) (PS-PVP) diblock copolymers. Gold nanoparticles coated with thiol-terminated PS and/or PVP homopolymer chains (Mn approximately 1300 and 1500 g/mol, respectively) are incorpora…
The growth and resulting crystallography of Cu nanowire arrays fabricated using glancing angle deposition are studied. On native oxide Si(100), the nanowires exhibited a strong (110) texture for a deposition angle θ=75° with rotational symmetry of the low energy Cu[111] about the long axis. On hydrogen-terminated Si(1…
Optical detection of electron paramagnetic resonance reveals the $I=7∕2$ EPR spectrum of ${\mathrm{V}}^{2+}$ in the sharp photoluminescence (PL) lines often observed at $\ensuremath{\sim}6885\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ in ZnO, which have universally been assumed previously to arise from…
We report a high-efficiency photoinduced phase transition in a spin-crossover complex [FeL(CN)2]∙H2O (where L is a N3O2 Schiff-base macrocyclic ligand). A single-shot laser pulse (8ns duration) is applied to induce the phase transformation, exhibiting molecular-structural, chromatic, and magnetic changes inside a ther…
Immobilized Lipase B from Candida antartica (CAL-B, Novozyme 435) catalyzed terpolymerizations of bis(hydroxymethyl)butyric acid, BHB (AB 2 ) and 1,8-octanediol (B 2 ) with adipic acid (A 2 ). The copolymerizations of these AB 2, B 2, and A 2 monomers were conducted in bulk, at 80 °C, without activation of the acid gr…
Electron-energy-loss spectroscopy (EELS) has been used to study the element contents of the grains in the bulk polycrystalline ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ag}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ ceramic samples prepared by conventional solid-state reaction process in air. Only characterized core-shell ioniz…
Polymersonden leuchten auf: Amplifizierende fluoreszierende, mit Biomolekülen konjugierte Polymere sind ausgezeichnete Lichtsammler und Superquencher (siehe Schema). Eine neuartige Synthese ermöglicht die hoch effiziente, einfache, schnelle und leicht zu steuernde Konjugation eines wasserlöslichen Poly(phenylenethinyl…
We show the effect of mechanical quenching on the thermodynamic state of an inorganic glass, i.e., calcium metaphosphate glass, measured using differential scanning calorimetry (DSC). The calcium metaphosphate glasses were isothermally stretched at a given stress; and then cooled slowly. Afterwards the glasses are sub…