Materials Literature
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Three structurally different aniline monomers, which can not be polymerized by chemical methods, have been polymerized with horseradish peroxidase. Enzymatic synthesis of linear polyaniline requires template molecules to minimize branching in the polyaniline backbone. Monomers having methoxy and methyl blocking groups…
Magnetoelectric particulate composites with varying ferrite content (3–20mol%) were synthesized in the system Pb(Zr0.52Ti0.48)O3 (PZT)–Ni0.8Zn0.2Fe2O4 (NZF) and it was found that 0.8PZT-0.2NZF composite material exhibited high response of the order of 450mV∕cmOe at the low frequency of 1kHz with 600Oe dc bias. This is…
In the present work, electroactive grain boundaries of highly dense metal oxide SnO2-based polycrystalline varistors were determined by electrostatic force microscopy (EFM). The EFM technique was applied to identify electroactive grain boundaries and thus estimate the amount of active grain boundary, which, in the met…
Sn O 2 nanocrystals are grown in silica starting from a sol-gel method and using Er doping to passivate the cluster boundaries. As a result, emission at 3.8eV from the decay of SnO2 free excitons is observed in nanostructured SnO2:SiO2, besides the extrinsic 2eV luminescence of defects in SnO2 and ascribable to substo…
Chutes and …︁ Ladders in coordination networks represent a boundary between 1D and 2D systems. Halogen-bridged PtII/PtIV mixed-valence ladder compounds have been synthesized for the first time. In these compounds, the band gap is controlled by changing the bridging halide ions. Moreover, by changing counteranions, the…
This research investigates the morphological nature and tribological behavior of boronized pure iron using experiments combined with theoretical analysis. Samples studied were 99.97% purity iron boronized for 4h at 800°C, 875°C and 950°C, respectively. Diffusion of the borided layer was analyzed by measuring the exten…
The effect of shear on crystalline order is interesting fundamentally, as well as technologically, for producing long-range alignment of micron- and nanoscale structures. We study the influence of shear on a sphere-forming diblock copolymer thin film consisting of a stack of two to six hexagonal layers, using a stress…
Raman scattering is used to observe pronounced electronic excitations around 230 meV--well above the two-phonon range--in the Mott insulators LaTiO3 and YTiO3. Based on the temperature, polarization, and photon energy dependence, the modes are identified as orbital excitations. The observed profiles bear a striking re…
Abstract The major objective of this research was to modify the surface characteristics of poly( L ‐lactide) (PLA) by grafting a combination of hydrophilic polymers to produce a continuum of hydrophilicity. The PLA film was solvent cast, and the film surfaces were activated by ultra violet (UV) irradiation. A single m…
A chalcopyrite structure is predicted for the potential superhard boron-carbonitride (BC2N), based on ab initio pseudopotential density functional method. Lattice constant, formation energy, bulk modulus, band structure, and electron density of states are calculated. The results show that this compound is a wide gap s…
Abstract We report here the successful functionalization of single‐walled carbon nanotubes with bioinspired sugar and phosphocholine polymeric structures via surface‐initiated atom transfer radical polymerization. The surface‐polymer‐coated carbon nanotubes have been systematically analyzed by Raman, infrared, ultravi…
It's all in the mix: A mixed-surfactant-templated synthesis gives noncrystalline metal–boron nanotubes (see picture: TEM image of Fe–B nanotubes; inset: the corresponding selected-area electron diffraction pattern) from simple starting materials under mild conditions. These nanotubes show better catalytic activity for…
In this letter the authors report the ferroelectric and magnetoelectric (ME) properties of the cofired bilayer composite targeting low cost lead-free magnetic field sensor. The ME response was characterized as a function of the magnetic field direction and as a function of the dc bias. It was found that when the ac ma…
Dielectric relaxation spectra of two closely related glass formers, dipropylene glycol [H-(C3H6O)2-OH] and dipropylene glycol dimethyl ether [CH3-O-(C3H6O)2-CH3], were measured at ambient and elevated pressures in the supercooled and the glassy states are presented. Hydrogen bonds formed in dipropylene glycol are remo…
Abstract Dendrimer‐like star‐branched polymers recently developed as a new class of hyperbranched polymers, which resemble well‐known dendrimers in branched architecture, but comprise polymer chains between junctions, are reviewed in this highlight article. In particular, we focus on the precise synthesis of various d…
Silica films co-implanted with Er and Au ions show an enhancement of rare earth photoluminescence after gold introduction in the matrix. Er excitation originates in a broad spectral region, from the red to the near ultraviolet. We have investigated the influence of gold aggregation on the optical properties of co-dope…
Optical absorption and reflectance measurements are performed to evaluate compositional and temperature dependences of band gap energies of Zn1−xCdxO alloys grown by molecular-beam epitaxy. The compositional dependence of the band gap energy, determined by taking into account excitonic contributions, is shown to follo…
The authors perform spin-polarized density functional theory simulations on the 3d transition metal (TM) series (Sc to Fe) doped system borazine (B3N3H6). The Sc and Ti bind most strongly to borazine but Cr and Mn do not bind at all. With increasing hydrogen content the bound hydrogen species becomes molecular. The ma…
A bottom-up route towards the synthesis of titania nanosheets is explored, alternative to the exfoliation of layered titanates. Nanosheets are assembled from the constituent elements and epitaxially matched to a suitable substrate: (1 x 2)-Pt(110). Their basic lepidocrocite structure is modulated at the nanoscale due…
Although metal foams are becoming accepted engineering materials, the reason for their stability in the liquid state is still under dispute. Liquid metal foams contain solid constituents which according to the existing models stabilize foam films by either modifying the curvature of the liquid/gas (L∕G) interfaces, or…