Materials Literature
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Magnetic properties of 2D systems of magnetic nanoobjects (2D regular lattices of the magnetic nanoparticles or magnetic nanostripes) are considered. The analytical calculation of the hysteresis curve of the system with interaction between nanoobjects is provided. It is shown that during the magnetization reversal sys…
The temperature and magnetic field dependence of the specific heat cp(T,H) in the superconducting mixed state as well as the upper critical field Hc2(T) have been measured for polycrystalline Y_xLu_{1-x}Ni_2B_2C and Y(Ni_{1-y}Pt_y)_2B_2C samples. The linear-in-T electronic specific heat contribution gamma(H)T exhibits…
We report first-principles calculations of the electronic band structure and lattice dynamics for the new superconductor MgB$_{2}$. The excellent agreement between theory and our inelastic neutron scattering measurements of the phonon density of states gives confidence that the calculations provide a sound description…
The fabrication, characterisation, and superconductivity of MgB2 thick films grown on stainless steel substrate were studied. XRD, SEM, and magnetic measurements were carried out. It was found that the MgB2 thick films can be fast formed by heating samples to 660 oC then immediately cooling down to room temperature. X…
The photoinduced 3D orientational structures in the films of liquid crystalline polyester, containing azobenzene side groups, are studied both experimentally and theoretically. By using the null ellipsometry and the UV absorption methods, preferential in-plane alignment of the azobenzene fragments and in-plane reorien…
One of the central dogmas in biochemistry is the view that the biologically active, three-dimensional structure of a protein is unique and exclusively determined by its amino acid sequence, and that the active conformation of a protein represents its state of lowest free energy in aqueous solution. Despite a large num…
Liquid crystals are states of condensed matter whose symmetries lie between those of 3-dimensionally peri-odic crystals and isotropic liquids. Thermotropic liquid crystalline phases are exhibited by a large number of organic compounds whose molecules have anisotropy of shape. A typical intermolecular energy responsibl…
[K(Q)][{ReH2(PMePh2)2}2(μ-H)3] is prepared by treatment of {ReH2(PMePh2)2}2(μ-H)4 with potassium hydride and a crown ether (Q = 18-crown-6 or 1,10-diaza-18-crown-6). The [K(1,10 diaza-18-crown-6)]+ salt contains NH...HRe protonic−hydridic bonds and has been characterized by 31P NMR, variable temperature 1H NMR, IR, an…
Ralstonia eutropha grows on and produces polyhydroxyalkanoates (PHAs) from fermentation acids. Acetic acid, one major organic acid from acidogenesis of organic wastes, has an inhibitory effect on the bacterium at slightly alkaline pH (6 g HAc/L at pH 8). The tolerance of R. eutropha to acetate, however, was increased…
We have previously reported on flat (lathlike) and helical single crystals grown from a smectic A* liquid crystalline (LC) phase of a main-chain nonracemic chiral polymer, PET(R*-9), synthesized from ( R )-(−)-4‘-{ω-[2-( p -hydroxy- o -nitrophenyloxy)-1-propyloxy]-1-nonyloxy}-4-biphenylcarboxylic acid. 1,2 In this pap…
Radiative and nonradiative relaxation processes after excitation by ultraviolet light were measured for o-, m-, and p- aryl ether dendrimers of fourth generation ( o-, m-, and p- Ar(L4) 2 ) by using fluorescent and thermal lens spectroscopies. Samples were dissolved in CH 2 Cl 2 to provide concentrations of a constant…
We report the synthesis and physical characterization of a series of peripherally functionalized porphyrazines (pzs) of the forms H2[pz(A;B3)] and trans-H2[pz(A2);B2], where A is a dithiolene chelate of molybdocene or vanadocene and B is a solublizing group. The precursor pz's 8 and 9, of the form H2[pz(A;B3)], where…
The electrical and optical properties of layered oxysulfides (Sr−Cu−M−O−S system (M = Zn, Ga, In)), which have common CuS layers, were studied to examine their potential as wide-gap p-type semiconductors. The attempts of electrical conductivity control by Na doping demonstrated that the conductivities of the Sr 2 - x…
We present a general linear response description of membrane adhesion at rough or chemically structured surfaces. Our method accounts for nonlocal Van der Waals effects and contains the more approximate (and local) Deryagin approach in a simple limit. Specializing to supported membranes we consider the effects of subs…
The complexation between a number of different pi-electron donating TTF derivatives and the pi-electron accepting tetracationic cyclophane cyclobis(paraquat-p-phenylene) (CBPQT(4+)) has been studied by (1)H NMR and UV-vis spectroscopy. The results demonstrate that the strength of association between the donors (TTF de…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Metal Disulfide NanotubesManashi Nath and C. N. R. RaoView Author Information Chemistry and Physics of Materials Unit and CSIR Centre Of Excellence In Chemistry Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur P.O., Bangalore 560 064, India Solid Sta…
We discuss the ground state of a two dimensional electron-lattice system described by a Su-Schrieffer-Heeger type Hamiltonian with a half-filled electronic band, for which it has been pointed out in the previous paper [J. Phys. Soc. Jpn. 69 (2000) 1769-1776] that the ground state distortion pattern is not unique in sp…
The nature of the five-fold surface of Al(70)Pd(21)Mn(9) has been investigated using scanning tunneling microscopy. From high resolution images of the terraces, a tiling of the surface has been constructed using pentagonal prototiles. This tiling matches the bulk model of Boudard et. al. (J. Phys.: Cond. Matter 4, 101…
Cyano-bridged bimetallic hybrid Prussian Blue one- to three-dimensional (1D-3D) coordination polymers based on [M(CN)6]3- (M = Fe, Cr, Mn) have attracted great attention because of their rich and interesting structures and magnetic behaviors. The previous study implies that increasing dimensionality may enhance and im…
Short discussion trying to explain, why superconductivity revealed for some diborides is not always confirmed in experiments of different research groups.