Materials Literature
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Moldable magnetism: Tunable photomagnetism is exhibited by homogeneous, optically transparent, moldable silica xerogel nanocomposites containing the ferromagnetic Prussian blue analogue KxCo[FeIII(CN)6]z. These materials also show a blue-shifted intervalence charge-transfer band and superparamagnetic behavior. The pic…
Some preliminary results from a model of temperature-sensitive contrast agents are reported. This paramagnetic system switches from a spin S = 0 diamagnetic state to a S = 2 paramagnetic one at a temperature that can be tuned according to chemical composition. The magnetic susceptibility jump and the subsequent R2* ef…
A class of spintronic materials, the zinc-blende (ZB) half metals, has recently been synthesized in thin-film form. We apply all-electron and pseudopotential ab initio methods to investigate the electronic and structural properties of ZB Mn and Cr pnictides and carbides, and find six compounds to be half metallic at o…
The results of ac and dc magnetization and heat capacity measurements on the oxides, Ca$_3$Co$_{1+x}$Mn$_{1-x}$O$_6$, forming in a K$_4$CdCl$_6$-derived rhombohedral quasi-one-dimensional crystal structure, are reported. As far as Ca$_3$Co$_2$O$_6$ is concerned, the results reveal truly complex nature of the two magne…
The Li-centered "ferric wheel" molecules with six oxo-bridged iron atoms form molecular crystals. We probed their electronic structure by X-ray photoelectron (XPS) and soft X-ray emission spectroscopy (XES), having calculated in parallel the electronic structure of a single "ferric wheel" molecule from first-principle…
A series of phenylazomethine dendrimers with a triarylamine core (TPA-DPA) were synthesized by dehydration using TiCl4. The complexation of the fourth genereration (G4) TPA-DPA with SnCl2 proceeds in not a random but a stepwise fashion from the core to the terminal imines of the G4 dendrimer. The molecular size of TPA…
A brush with gold: Gold nanoparticles with a narrow size distribution have been coated with well-defined, high-density polymer brushes (see AFM image) by means of surface-initiated living radical polymerization. The gold nanoparticles have formed a 2D array with a high degree of structural order and exceptional contro…
Materials aspects of cuprate high-temperature superconductors (HTS) are reviewed with respect to technical applications. The structural chemistry common to all HTS and their critical temperatures for the onset of superconductivity are presented. Intrinsic problems for the production of technically applicable HTS mater…
Potential application fields for cuprate high-temperature superconductors (HTS) and the status of respective projects are reviewed. The availability of a reliable and inexpensive cooling technique will be essential for a future broad acceptance of HTS applications.
STRUCTURE, DEFECTS AND ELECTRONIC PROPERTIES OF AMORPHOUS SEMICONDUCTORS PHOTO-INDUCED STRUCTURE-RELATED METASTABILITY IS AMORPHOUS CHALOGENIDES Short-, medium-, and long-range order structural transformations in amorphous chalcogenides (E. Mytilineou and A. V. Kolobov) Dynamics of photoinduced metastability in amorph…
Glasses based on rare earth oxide-aluminum oxide and containing high concentrations of Er<sub>2</sub>O<sub>3</sub>, Tm<sub>2</sub>O<sub>3</sub>, Yb<sub>2</sub>O<sub>3</sub>, or Ho<sub>2</sub>O<sub>3</sub> were synthesized. The host glass is strong, hard, highly resistant to chemical attack, and stable to temperatures…
Er<sup>3+ </sup>doped tellurite glasses have recently gained interest because of broad emission band in 1.5 μm telecom window. In this paper we present results of our research aiming at the fabrication of surface waveguides in these glasses. Tungsten-tellurite and zinc-tellurite glasses doped with various Er<sub>2<…
Selective preparation of double wall carbon nanotubes (DWCNTs) is achieved by a floating iron catalyst CVD method with sufur promotion. SEM shows that the product consists of entangled nanotubes. HRTEM and Raman scattering have revealed that the smallest inner diameter of as‐grown carbon nanotubes is 0.4 nm (see Figur…
Abstract The surfaces of poly(styrene‐ co ‐acrylic acid) copolymers and their Na‐ and Cs‐neutralized ionomers were modified by O 2 ‐plasma source ion implantation (PSII) treatment to improve the surface wettability. The changes in the surface wettability, composition, and structure upon the PSII treatment were examine…
Abstract A viscoelastic approach of the compression set test is addressed in this work. This test measures the ability of rubber compounds to retain elastic properties after prolonged action of compressive stresses. Elastic properties were tested by recording the normal stress under a constant deformation of 25% with…
Abstract Functionalized fulgimides are regarded as a promising class of photochromic compounds for modulating the structure and function of biomolecules. A new synthetic route to fulgimides bearing amino‐functionalized substituents at the imide nitrogen atom has been developed. The synthesis of the fulgimides has been…
We present a novel efficient gradient-based optimization algorithm for the design of diffractive optical elements (DOE's) for synthetic spectra applications. Two design examples are given. The results demonstrate that the DOE's obtained by the proposed algorithm can accurately produce the desired intensity spectra at…
Abstract To examine the accessibility of the enzyme cellodextrin phosphorylase (CDP) towards multivalent cluster carbohydrates, the cellobiosylated dimer 10 and trimer 12 , as well as the cellobiose‐coated PAMAM dendrimers 14 , 16 , 18 , 20 and 22 , with four, eight, sixteen, thirty‐two and sixty‐four cellobiose units…
Spin-resolved O $1s$ x-ray absorption measurements on ${\mathrm{CrO}}_{2}$ reveal that the spin polarization of the states at the Fermi level approaches 100%, providing direct evidence of the half-metallic nature of ${\mathrm{CrO}}_{2}.$ The measurements also show the existence of an atomiclike Cr $3d$ state not far a…
A judicious choice of the lanthanide cation and its content in the Na 3 (Y 1– a M a )Si 3 O 9 (M=Tm 3+ , Tb 3+ ; a = 0–1) system allows the optical properties to be tuned over a very wide range. The materials have the same framework structure and encompass thulium‐based blue‐ and infrared‐emitters and terbium‐based X‐…