Materials Literature
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Another brick in the wall: Organic groups that contain several alkoxysilane substituents are applied in the synthesis of hybrid inorganic–organic mesoporous materials (see scheme). The resulting materials contain the organic moiety as an integral part of the wall. Depending on the functionality of the organic groups a…
Two antiferromagnetically coupled tunneling systems is a minimal model exhibiting the effect of quantum-mechanical phase in the Landau-Zener effect. It is shown that the averaged staying probability oscillates vs resonance shift between the two particles, as well as vs sweeping rate. Such a resonance shift can be prod…
Magnetic nanoparticles have potential applications in high-density memory devices, but their complicated synthesis often requires high temperatures, expensive reagents, and postsynthesis annealing to achieve the desired magnetic properties. Current synthetic methods for magnetic nanoparticles often require post-synthe…
BACKGROUND: Salmonella enterica and Campylobacter jejuni are amongst the more prevalent bacterial pathogens that cause foodborne diseases. These microorganisms are common contaminants of poultry and poultry products. This study was aimed to evaluate the antibacterial activity of metallic copper surfaces on these impor…
Exploiting the self‐assembling properties of liquid crystals , large‐scale spontaneous alignment of single‐ and multi‐walled carbon nanotubes induced by elastic interactions with the nematic LC matrix is demonstrated (see Figure). Collective reorientation processes of the liquid crystal are further used to reversibly…
Using t(2g) Wannier functions, a low-energy Hamiltonian is derived for orthorhombic 3d(1) transition-metal oxides. Electronic correlations are treated with a new implementation of dynamical mean-field theory for noncubic systems. Good agreement with photoemission data is obtained. The interplay of correlation effects…
Nanomaterials are at the leading edge of the rapidly developing field of nanotechnology. Their unique size-dependent properties make these materials superior and indispensable in many areas of human activity. This brief review tries to summarise the most recent developments in the field of applied nanomaterials, in pa…
We investigate a one-dimensional Hamiltonian system that describes a system of particles interacting through short-range repulsive potentials. Depending on the particle mean energy epsilon the system demonstrates a spectrum of kinetic regimes, characterized by their transport properties ranging from ballistic motion t…
We deposited high quality ZnO film by electrophoretic deposition (EPD) using high quality ZnO powder prepared by solid-state pyrolytic reaction. X-ray photoelectron spectroscopy (XPS) and the infrared (IR) absorption spectrum clearly indicate that the ZnO phase powder has been prepared. Transmission electron microscop…
Situating carbon nanotubes (CNTs) near the cathode of a microplasma device, or integrating CNTs directly into the device cathode, reduces significantly the operating and ignition voltages for the device. Radiant output is also improved and the greatest benefit to device operation is realised when the CNTs are deposite…
A spectroscopic Judd–Ofelt investigation has been performed on Pr3+ ions doped in calcium fluorapatite, Ca5(PO4)3F, belonging to the apatite structure family. The standard Judd–Ofelt analysis was applied to the room temperature absorption intensities of Pr3+ transitions to determine the phenomenological intensity para…
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The dynamics of polarization switching have been investigated over extremely broad time (10−8<t<102 s) and field ranges for (001)c, (110)c, and (111)c-oriented Pb(Zn1/3Nb2/3)O3–4.5%PbTiO3 crystals. The results demonstrate the presence of broad relaxation time distributions that can extend over a decade(s…
We formulate a physical model to extract effective dose and defocus (EDD) from pattern profile data and demonstrate its efficacy in the analysis of in-line scatterometer measurements. From the measurement of a single target structure, the model enables simultaneous computation of pattern dimensions pre-calibrated to t…
Bulk perovskite manganese oxide La1−xSbxMnO3 (x=0.05,0.1) samples were prepared using solid-state reaction technology. Electrical transport and magnetic properties have been investigated. The experimental results show that the compound exhibits typical colossal magnetoresistance (CMR) behavior. The temperature and tim…
We report on a Monte Carlo study of the pathway for crystal nucleation in a fluid of short, hard, colloidal rods. In the earliest stages of nucleation, a single-layered lamellar crystallite forms. Subsequent thickening of this lamella is hampered by the fact that the top and bottom surfaces of the crystallite are pref…
Substantial progress has been made recently in extending the supramolecular assembly of biomimetic structures to vesicle-based sophisticated nanocomposites and mesostructures. We report herein the successful preparation of unilamellar surfactant vesicles coated with a monolayer of ring-shaped [Mo(154)] polyoxometalate…
An overview is given of the isotropic and nematic phase behaviour in binary mixtures of hard rods or plates with different lengths or diameters within the framework of the Onsager theory. On the basis of Gaussian trial functions the relative importance of different entropic contributions in the demixing of the isotrop…
The mechanism involved in the Tm3+ (3F4)→Ho3+ (5I7) energy transfer and Tm3+ (3H4, 3H6)→Tm3+ (3F4, 3F4) cross relaxation as a function of the donor and acceptor concentrations was investigated in Tm–Ho-codoped fluorozirconate glasses. The experimental transfer rates were determined for the Tm→Ho energy transfer from t…
The phase behavior of block copolymers melts involving competing length scales, i.e., able to microphase separate on two different length scales, is theoretically investigated using a self-consistent field approach. The specific block copolymers studied consist of a linear A-block linked to an alternating (A- alt -B)-…