Materials Literature
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Taking into account Goodenough's superexchange rules, including both full structural relaxation and spin-orbit coupling, and checking strong correlation effects, we look for compensated half metals within the class of oxide double perovskites materials. Identifying likely half-metallic (or half-semimetallic) antiferro…
We report a direct observation of the microscopic origin of the bipolar resistive switching behavior in nanoscale titanium oxide films. Through a high-resolution transmission electron microscopy, an analytical TEM technique using energy-filtering transmission electron microscopy and an in situ x-ray photoelectron spec…
Abstract La 0.6 Sr 0.4 CoO 3– δ (LSC) thin‐film electrodes are prepared on yttria‐stabilized zirconia (YSZ) substrates by pulsed laser deposition at different deposition temperatures. The decrease of the film crystallinity, occurring when the deposition temperature is lowered, is accompanied by a strong increase of th…
We present results of tight binding calculations demonstrating existence of degenerate electronic shells of Dirac Fermions in narrow, charge neutral graphene quantum rings. We predict removal of degeneracy with finite magnetic field. We show, using a combination of tight binding and configuration interaction methods,…
Photopolymerizable poly(ethylene glycol) (PEG)- based hydrogels have great potential as in vivo cell delivery vehicles for tissue engineering. However, their success in vivo will be dependent on the host response. The objectives for this study were to explore the in vivo host response and in vitro macrophage response…
Fluorescent defects in noncytotoxic diamond nanoparticles are candidates for qubits in quantum computing, optical labels in biomedical imaging, and sensors in magnetometry. For each application these defects need to be optically and thermodynamically stable and included in individual particles at suitable concentratio…
MnO 2 with different crystallographic forms (α, γ) and morphologies (needles, rods, and spindles) was fabricated via a facile quick-precipitation procedure at a low temperature (about 83 °C) without using any templates or surfactants. The proposed mechanism is focused on the different reaction parameters that affect t…
We report on observation of photoluminescence (PL) in blue and UV regions of exciton origin in bioinspired material-peptide nanotubes (PNTs). Steplike optical absorption and PL measurements have allowed finding quantum confined (QC) phenomenon in PNTs. The estimations show that QC in these nanotubes occurs due to a cr…
An important goal in supramolecular chemistry is to achieve controlled self-assembly of molecules into well-defined nanostructures and the subsequent control over macroscopic properties resulting from the formation of a nanostructured material. Particularly important to our lab is control over viscoelasticity and bioa…
Thermoelectric power generation is foreseen to play a much larger role in the near future, considering the need for alternative energies because of declining natural resources as well as the increasing efficiency of thermoelectric materials. The latter is a consequence of the discoveries of new materials as well as of…
Hydrogels are of great interest as a class of materials for tissue engineering, axonal regeneration, and controlled drug delivery, as they offer 3D interwoven scaffolds to support the growth of cells. Herein, we extend the family of the aromatic Fmoc-dipeptides with a library of new Fmoc-peptides, which include natura…
We report an experimental and modeling analysis of ferroresonance phenomena in a series inductance–capacitance–resistance circuit with a saturable inductor. The nonlinear reactor core is made of a nanocrystalline ribbon whose magnetic properties can be modified by suitable thermal treatments. This choice of core allow…
Parametric oscillations are observed in torsional electromechanical oscillators based on carbon nanotubes via molecular dynamics simulations. The stretch of nanotube torsion springs due to the vertical translational-electrostatic force acting on the paddle makes possible the parametric oscillations. The electrostatic…
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Abstract Based on a single crystal chemical vapour deposition (scCVD) diamond plate a position sensitive detector [position sensitive detection position sensitive detector (PSD)] has been fabricated. The ∼9 mm 2 sensing area of the detector consists of a diamond‐like carbon (DLC) thin film, in the form of a plane‐pad…
An order-order transition (OOT) in the sequence of a hexagonally arranged core-shell cylinder to a double-hexagonally arranged dot in polystyrene-block-poly(butadiene)-block-poly(2-vinylpyridine) (SBV) triblock copolymer thin films is reported to be induced upon exposure to a solvent vapor that is strongly selective f…
Abstract Nanocrystalline diamond (NCD) films are of great importance for many applications. They can be implemented as transparent protective coatings or for the use in electronic devices, sensor systems, and bioelectronic systems. In many applications the surface properties dictate the eventual performance of the dev…
To better understand the role of nitrogen (N) during crystallization of Sb-rich phase change materials, a study was conducted using Sb and Sb70Te30 as host materials of N. Crystallization of the as-sputtered Sb–N films of varying N content was examined to reveal that Sb–N bonds are formed in the as-sputtered states, e…
We show that the strong hybridization between the iron 3d and the arsenic 4p orbitals, in the newly discovered iron-based high- T c superconductors, leads to an explanation of certain experimental observations that are presently not well understood. The existence of a lattice distortion, the smallness of the Fe magnet…
Analysis of (169)Tm Mössbauer spectra recorded for (hexagonal phase) h- TmMnO(3) confirms that the Mn sublattice orders magnetically below T(N)(Mn) = 82-83 K and reveals the growth of a local Tm moment at the 4b site that is induced by the Mn-Tm exchange interaction. The maximum hyperfine field recorded at the (169)Tm…