Materials Literature
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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…
It has been suggested that high-density amorphous (HDA) ice is a structurally arrested form of high-density liquid (HDL) water, while low-density amorphous ice is a structurally arrested form of low-density liquid (LDL) water. Recent experiments and simulations have been interpreted to support the possibility of a sec…
The structural and magnetic properties of NiMnSb films, 5–120 nm thick, grown on InGaAs/InP(001) substrates by molecular-beam epitaxy, were studied by x-ray diffraction, transmission electron microscopy (TEM), and ferromagnetic resonance (FMR) techniques. X-ray diffraction and TEM studies show that the NiMnSb films ha…
Liquid crystalline (LC) ionomers containing azobenzene mesogens and three transition metal ions (Cu 2+, Zn 2+, and Mn 2+ ) were prepared and characterized. Metal ions were found to exert significant effects on the photoinduced orientation of azobenzene mesogens and on the diffraction efficiency of holographic gratings…
In this paper, the adsorption energy of an acicular (prolate and cylindrical) particle onto a liquid-fluid interface and the effect of the line tension are investigated. The results show that, without line tension, acicular particles always prefer to lie flat in the plane of the interface. However, line tension plays…
The new trichlorosilane 2,6-Et 2 C 6 H 3 N(SiMe 3 )SiCl 3 ( 2 ) on controlled hydrolysis yields 2,6-Et 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 ( 3 ). X-ray diffraction analysis of 3 reveals a rare structure type of aggregation where eight molecules of the silanetriol form an octameric cage through intermolecular O−H···O hydrogen…
We described the photoluminescence (PL) properties of individual micelle-encapsulated single-walled carbon nanotubes (SWNTs) at room temperature. Single PL peak from isolated individual SWNT with a chiral index of (6, 5) showed a linear increase and saturation behavior of the PL intensity. Unusual PL intensity fluctua…
Continuum analysis and molecular simulations are carried out to study the adhesion between two identical single-walled carbon nanotubes. A critical radius Rmin=D∕Wflat is found below which the contact area is zero, where D is the effective bending stiffness of the nanotube, and Wflat is the work needed to separate two…