Materials Literature
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Correlation effects on the electronic structure of half-metallic CrAs in zinc-blende structure are studied for different substrate lattice constants. Depending on the substrate the spectral weight of the nonquasiparticle states might be tuned from a well-developed value in the case of an InAs substrate to an almost ne…
In homogeneous (ideal) glasses, the important dimensionless stretched-exponential shape parameter beta is described by magic (not adjusted) simple fractions derived from fractal configuration spaces of effective dimension d* determined by different topological axioms (rules) in the presence (absence) of a forcing elec…
The in vivo deposition of amyloid fibrils is a hallmark of many devastating diseases known as the amyloidoses. Amyloid formation in vitro may also complicate production of proteins in the biotechnology industry. Simple, sensitive, and versatile tools that detect the fibrillar conformation of amyloidogenic proteins are…
Bias dependent scanning tunneling microscopy and scanning tunneling spectroscopy have been used to characterize the influence of transverse electric fields on the electronic properties of boron-nitride nanotubes (BNNTs). We find experimental evidence for the theoretically predicted giant Stark effect. The observed gia…
This paper is devoted to study many-body effects in the positron annihilation experiment, both electron-positron (e-p) and electron-electron (e-e) correlations. Various theories of the e-p interaction in real solids were used to verify them by comparing theoretical and experimental e-p momentum densities in Cu and Y.…
Abstract Polymer networks showing a thermally induced shape‐memory effect were prepared through the crosslinking of oligo(ϵ‐caprolactone)dimethacrylates under photocuring with or without an initiator. The influence of the molecular weight of the oligo(ϵ‐caprolactone)dimethacrylates and the initiator concentration on t…
Abstract Summary: Two types of ink‐jet inks are presented: ink containing an aqueous dispersion of silver nanoparticles and an oil‐in‐water microemulsion‐based ink. The metallic ink contains nanoparticles of silver, which are formed in the presence of an ionic polymeric stabilizer. Sintering of the printed image obtai…
New types of monodisperse, micrometer-sized, hollow particles (see Figure) are obtained by encapsulation of emulsion droplets in solid shells and dissolution of the cores. A facile fabrication method is used in which, by simply tuning the thickness of the shells, different types of particles with tunable properties ar…
Mechanical strain gradient generated electric polarization or flexoelectric effect was investigated in unpoled lead zirconate titanate (PZT) ceramics in the ferroelectric state by using a cantilevered beam based approach. Flexoelectric coefficient μ12 at room temperature was measured to be 1.4μC∕m in the PZT ceramic a…
The formation of MgAl layered double hydroxide (LDH) from physically mixed MgO and Al 2 O 3 oxides upon hydrothermal treatment has been extensively investigated, and a formation mechanism has been proposed. We observed that the formation of LDH from the oxide mixture occurs upon heating at 110 °C. In general, LDH is t…
The cyano-bridged trinuclear compound, (NEt(4))[Mn(2)(salmen)(2)(MeOH)(2)Fe(CN)(6)] (1) (salmen(2)(-) = rac-N,N'-(1-methylethylene)bis(salicylideneiminate)), reported previously by Miyasaka et al. (ref 19d) has been reinvestigated using combined ac and dc susceptibility measurements. The strong frequency dependence of…
We report an accurate determination of the hydrodynamic boundary condition of simple liquids flowing on smooth hydrophobic surfaces using a dynamic surface force apparatus equipped with two independent subnanometer resolution sensors. The boundary slip observed is well defined and does not depend on the scale of inves…
Copolyamides, based on 1,12-dodecanedicarboxylic acid and different ratios of 1,2-ethylenediamine and piperazine, i.e., PA-(2.14- co -pip.14), as well as the corresponding homopolymers PA-2.14 and PA-pip.14, were studied by SAXS and WAXS. Up to a pip mole ratio of 0.62, the 2.14 and pip.14 units cocrystallize in a com…
Synthesis of copper and zinc phthalocyanines (Pcs) bearing phenoxy-substituents is described. Precursors required for the preparation of Pcs 9-16 are prepared by a nucleophilic aromatic substitution reaction between a sterically hindered phenol derivative and 4-nitrophthalonitrile (1) or 3-nitrophthalonitrile (2). Cyc…
We report the direct supramolecular assembly of organofunctional compositions of the type (SiO2)1-x-(LSiO1.5)x (L = mercaptopropyl) with a mesocellular foam structure (x = 0.20), along with a new hybrid structure in which the windows of a foam structure are filled with a wormhole framework (x = 0.30−0.50).
The synthesis of core−shell nanoparticles consisting of a shape-persistent polyphenylene dendrimer ( TdG 2 ) as the core and of different polymers (poly(ethylene oxide), polystyrene and polyisoprene) as mono- or double -shells is presented. Mono-shell systems are obtained either by a “ grafting-onto” (arm first) proce…
Abstract Platinum and gold microelectrode arrays (MEAs), fabricated on silicon substrates with different geometric characteristics, were surface‐modified by the potentiostatic electropolymerization of the pyrrole‐ferrocene derivative Py(CH 2 ) 3 NHCOFc, in the case of the platinum MEAs, and chemisorption of the th…
The phase behavior of the newly found miscible polymer blends poly(4-trimethylsilylstyrene) and polyisoprene was investigated with optical microscopy (OM) and also with differential scanning calorimetry (DSC), while the degree of polymer−polymer interaction was evaluated with small-angle neutron scattering (SANS). The…
Modern materials science requires efficient processing and characterization techniques for low dimensional systems. Raman and photoluminescence spectroscopy are important nondestructive tools which provide much information about such systems. Commercial Raman spectrometers are expensive. We discuss a less expensive ap…
Select ferrous spin-transition complexes with the pentadentate ligand 2,6-bis(bis(2-pyridyl)methoxymethane)pyridine (PY5) were examined using variable-temperature solution solid-state magnetic susceptibility, crystallography, X-ray absorption spectroscopy (XAS), and UV/vis absorption spectroscopy. Altering the single…