Materials Literature
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Using photoluminescence and Raman scattering, we have studied the optical properties of Mn-doped ZnS nanocrystallites prepared by a microemulsion-hydrothermal method. The PL spectrum shows two distinct peaks in the blue-green region. The PL peak from the nanoparticles, in the region 400–480 nm (3.1–2.6 eV), shifts tow…
Vibrational properties of Ba doped Si clathrate are investigated at high pressures up to 20 GPa by Raman spectroscopy. Vibrations related with Ba encaged in the Si cages are observed below $100\text{ }\text{ }{\mathrm{c}\mathrm{m}}^{\ensuremath{-}1}$ by low-frequency Raman measurements of ${\mathrm{B}\mathrm{a}}_{8}{\…
We report on the nature of photothermally patterned regions inside self-assembled hydrogel nanoparticle materials containing coassembled colloidal Au. These composite materials are prepared from approximately 226-nm diameter particles composed of the environmentally responsive polymer, poly(N-isopropylacrylamide) (pNI…
This paper presents a unified theoretical picture of quasi-two-dimensional organic conductors in a new minimal model based on an anisotropic triangular lattice. These materials exhibit abundance of low-temperature physics, where the systematic understanding was lagging behind respective studies. This is ascribed to a…
The concept of matrix-mediated coupling assumes that coupling between movements of unlike cations in glass occurs in order to dissipate mechanical stresses created by small cations entering sites which are too large (e.g. Li+ ions entering empty sodium, ā, sites) and large cations entering sites which are too small (e…
Ion-conducting chalcogenide glasses have been chosen to illustrate three specific electrical effects in glasses and their relationship with the glassy structure. Firstly, the variation of conductivity with the mobile cation content was investigated for glasses from the systems Ag 2 S–GeS 2 , Ag 2 S–As 2 S 3 and x Ag 2…
Structure, transport properties, and electronic structure of epitaxial thin films ${\mathrm{La}}_{0.9}{\mathrm{Sn}}_{0.1}{\mathrm{MnO}}_{3}$ and ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}{\mathrm{MnO}}_{3}$ have been experimentally studied. According to the Hall-effect measurement, ${\mathrm{La}}_{0.9}{\mathrm{Sn}}_{0.1}…
Dielectric relaxation measurements of the ion dynamics in glassy, molten and crystalline ionic conductors show general properties independent of chemical composition and structure. These include the appearance of a near-constant loss at high frequencies/low temperatures and the transition to a many-particle ion-hoppin…
Hexagonal diamond (hDIA) and wurtzite-type BN (wBN) powders were synthesized using a Kawai-type high-pressure apparatus and the essential details of their structures were examined by Reitveld refinements in order to investigate their thermodynamic stability and transition mechanism. X-ray diffraction profiles of the p…
Highly Sensitive ZnO Ozone Detectors at Room Temperature, Bender, Marcus, Fortunato, Elvira, Nunes, Patrícia, Ferreira, Isabel, Marques, António, Martins, Rodrigo, Katsarakis, Nikos, Cimalla, Volker, Kiriakidis, George
Large-amplitude oscillatory shear alignment of a hierarchically ordered system of comb-shaped supramolecules and the preparation of core−corona nanorods thereof are reported. The supramolecules consist of nearly symmetric polystyrene- b -poly(4-vinylpyridine) diblock copolymers with pentadecylphenol side chains hydrog…
In this paper, we report the synthesis of well defined nanocomposite particles of polypyrrole (PPy) coated γ-Fe 2 O 3 . The nanocomposites with different γ-Fe 2 O 3 contents are generated by microemulsion polymerization of pyrrole by dispersing γ-Fe 2 O 3 in the oil phase. The structural properties of the nanocomposit…
The rate theory of irradiation effects in crystalline solids rests on a set of two ordinary differential equations which, for each type of point defect (vacancy and self-interstitial), describe the balance between the production of defects on the one hand and their annihilation on the other. The latter process occurs…
In order to study the high energy optical transitions i.e., 4f-to-5d (f-d) and charge-transfer (CT) spectra of trivalent rare earth (4f n -series, lanthanide) ions in crystal lattices, the luminescence excitation spectra of the series ions in LaPO 4 host lattices are measured in the vacuum ultraviolet (VUV)-ultraviole…
A microscopic study of functional disorder-order folding transitions coupled to binding is performed for the p27 protein, which derives a kinetic advantage from the intrinsically disordered unbound form on binding with the phosphorylated cyclin A-cyclin-dependent kinase 2 (Cdk2) complex. Hierarchy of structural loss d…
We present a procedure for designing to control the three-dimensional light-intensity distribution near focus. Our method is based on the use of a series of figures of merit that are properly defined to describe the effect of general complex pupil functions. As a practical implementation, we have applied our method to…
Using a two-step procedure based on (i) anchoring an organogold precursor within the channels of functionalized ordered mesoporous silica containing mercapto groups; (ii) followed by chemical reduction, we prepared materials containing gold (0) nanoparticles exclusively located within the pore channels. By modifying t…
The partial structure factors of bulk-quenched glassy GeSe 2 were measured by using the method of isotopic substitution in neutron diffraction to enable the first detailed comparison at the partial pair distribution function level of a covalently bonded network system in both its glassy and liquid phases. The results…
The diagonal and off-diagonal tensor components of the first hyperpolarizability of a series of Λ-shaped molecules are compared by means of ab initio and semiempirical molecular orbital calculations. The calculated results are rationalized using expressions derived from a simple valence-bond charge-transfer model in w…
Here, we report the successful direct observation of the smallest free-standing single-walled carbon nanotube, which has a diameter of about 0.43 nm. Our single-walled carbon nanotubes were produced by the improved floating reactant method, which combines the conventional substrate and floating catalyst methods using…