Materials Literature
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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…
High-resolution solution (13)C-NMR and CD studies of Bombyx mori silk fibroin revealed the presence of an ordered secondary structure 3(10)-helix, in hexafluoro-iso-propanol (HFIP). The solid-state structure of the silk fibroin film prepared by drying it gently from the HFIP solution still keep the structure, 3(10)-he…
A series of single-phase wurzite Mg x Zn 1- x O alloys from x =0 to 0.5 were successfully obtained by molecular beam epitaxial growth on sapphire substrates, resulting in artificial tuning of band gap energy E g from 3.3 to 4.5 eV which covers UV-A, UV-B, and solar-blind spectral regions. The problem of phase separati…
TiS2 nanotubes, which were synthesized through a chemical transport reaction, are very effective in reversible hydrogen absorption and desorption with the capacity of 2.5 wt %.
Bonding, electric (hyper)polarizability, vibrational and magnetic properties of heterofullerene ${\rm C}_{48}{\rm B}_{12}$ are studied by first-principles calculations. Infrared- and Raman-active vibrational frequencies of ${\rm C}_{48}{\rm B}_{12}$ are assigned. Eight $^{13}$C and 2 $^{11}$B NMR spectral signals of $…
Transport and magnetic measurements have been carried out on perovskite Co-oxides R1-xAxCoO3 (R=La, Pr, and Nd; A=Ba, Sr and Ca; 0<x<0.5: All sets of the R and A species except Nd1-xBaxCoO3 have been studied.). With increasing the Sr- or Ba-concentration x, the system becomes metallic ferromagnet with rather large mag…
We present the results of Monte Carlo simulations of a model of a single maghemite ferrimagnetic nanoparticle with the aim to clarify the role played by the increased anisotropy at the surface and by the shape (spherical or elliptical) of the particle on the magnetization processes at low temperatures. The formation o…
We report temperature dependent ac susceptibility ($χ$) measurements on a high quality single crystal of Tb$_2$PdSi$_3$, crystallizing in a AlB$_2$-derived hexagonal structure. This compound is found to exhibit features attributable to quasi-low-dimensional magnetism at high temperatures and {\it anisotropic} spin-gla…