Materials Literature
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The heterogeneity of composite leads to the extra charge concentration at the boundaries of different phases that results essentially nonzero effective electric susceptability. The relation between tensors of effective electric susceptability $\hatχ_{ef}$ and effective conductivity $\hatσ_{ef}$ of the infinite two--di…
We present a fully three-dimensional study of the multiexciton optical response of vertically coupled GaN-based quantum dots via a direct-diagonalization approach. The proposed analysis is crucial in understanding the fundamental properties of few-particle/exciton interactions and, more important, may play an essentia…
We demonstrate efficient spin-polarized tunneling between a ferromagnetic metal and a ferromagnetic semiconductor with highly mismatched conductivities. This is indicated by a large tunneling magnetoresistance (up to 30%) at low temperatures in epitaxial magnetic tunnel junctions composed of a ferromagnetic metal (MnA…
A novel class of photosensitive organometallic precursor materials is used to pattern thin film mixed-metal oxide structures. In this work a photosensitive organometallic precursor is coated onto a silicon substrate and exposed to ultraviolet light through a mask to form patterned oxide structures. This is a negative-…
Substitution rules defined on the binary alphabet and invariant under the interchange of both participating symbols are considered. Typically, the resulting symbolic sequences are weakly disordered, and their Fourier spectra are singular continuous. Exact relations are derived which express the correlation dimension o…
Irreversible cis-to-trans photoisomerization behavior was observed for a stilbazole–porphyrin (1), and its zinc complex (2). trans-1 and trans-2 did not isomerize to the corresponding cis-isomer under irradiation with UV light, although stilbazoles readily undergo the trans-to-cis isomerization upon UV irradiation. In…
In this work molecular contamination of optical components such as e.g. reflective mirrors for extreme ultraviolet (EUV) lithography was experimentally studied using irradiation with keV electrons. Since secondary electrons are known to initiate most of the surface chemistry, radiation with EUV photons or electrons of…
Mesopores become micropores under pressure (10–50 MPa), which is applied to dahlia-shaped arrays of single-wall carbon nanohorns (SWNHs, see Figure for a TEM image) in liquid media, such as ethanol or glycerol. While the morphology of the arrays does not substantially change, the apparent volume shrinks by a factor of…
Organoclay hollow microspheres (see Figure) and spheroids with foam-like interiors have been prepared by an in-situ reaction in water-in-oil emulsion droplets. The materials could be calcined at 673 K with retention of the morphology, thus proving the thermal stability. The technique should be applicable to a wide ran…
Uniaxial orientation of metal–organic europium complexes (see Figure) has been achieved using ultra-high molecular weight polyethylene. The orientation of the ligand molecules results in the transfer of polarized energy from the ligand to Eu3+, and thus yields polarized emission from the complex. The spectral properti…
The use of conducting electroactive polymers (CEPs) to monitor and manipulate biomolecular interactions is reviewed in this article. Examples involving simple amino acids, more complex protein structures, DNA, and even whole living cells are discussed. The work described clearly demonstrates that the ability of CEPs t…
Carbon nanotube films that are mechanically robust and light weight (see Figure) have been engineered to coat surfaces of metallic structures or to be embedded within composite/heterogeneous systems. For high-temperature applications the performance of the nanotube films is expected to be superior to conventional damp…
Polarized images have been prepared using simple laser-induced melting of aligned nanorods in a polymer film. The technique is easy-to-use, cost-effective, and may be used to render the read-out either legible or illegible (see Figure). The information content could be increased by creating ordered nanoparticles with…
The electronic structures of hexagonal beta-Al9Mn3Si and phi-Al10Mn3 are investigated through self-consistent calculations carried out using the LMTO method. This ab-initio approach is combined with an analysis of a simplified hamiltonian model for Al based alloys containing transition metal atoms. Results show a stro…
CdS nanoparticles capped with tri-n-octylphosphine oxide (TOPO) have been synthesised by a single-source route using cadmium ethylxanthate as a precursor. The nanoparticles obtained show quantum size effects in the optical absorption spectra and the photoluminescence shows an emission maximum that is characteristicall…
We study the morphological evolution of strained heteroepitaxial films using kinetic Monte Carlo simulations in two dimensions. A novel Green's function approach, analogous to boundary integral methods, is used to calculate elastic energies efficiently. We observe island formation at low lattice misfit and high temper…
We examine the bound state(s) associated with a single cubic nonlinear impurity, in a one-dimensional tight-binding lattice, where hopping to first--and--second nearest neighbors is allowed. The model is solved in closed form {\em v\`ıa} the use of the appropriate lattice Green function and a phase diagram is obtained…
The optical properties of YNi$_2$B$_2$C are studied by using the first-principles full-potential linearized augmented plane wave (FLAPW) method within the local density approximation. Anisotropic behavior is obtained in the optical conductivity, even though the electronic structure shows 3D character. A large peak in…
The structural energetics of PdTi and PtTi have been studied using first-principles density-functional theory with pseudopotentials and a plane-wave basis. We predict that in both materials, the experimentally reported orthorhombic $B19$ phase will undergo a low-temperature phase transition to a monoclinic $B19'$ grou…
Conductive polymer–sulfur composites have been reported as potential cathode materials for rechargeable batteries due to their structure, i.e., sulfur embedded in a conductive polymer host at molecular level (see Figure for a backscattered electron photograph). The low-cost, environmentally friendly sulfur composite h…