Materials Literature
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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.
This comment concerns the homogenization of 2D dielectric photonic crystals, and the fact that the limits $k\to 0$ ($k$ is the Bloch vector) and $ε\to +\infty $ do not commute for $p$-polarized waves
We investigate the mechanism of the resonant X-ray scattering on the Ti $K$ edge region of YTiO$_3$ using the band structure calculation combined with the local density approximation. A large intensity is obtained for the orbital superlattice spots. The calculated spectra consist of several peaks as a function of phot…
Using sub-picosecond optical pump-probe techniques, coherent zone-folded longitudinal acoustic phonons (ZFLAPs) were generated and controlled in an InGaN multiple quantum well structure. A one-pump, one-probe differential transmission technique revealed that carriers injected near the barrier band edge were quickly ca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChanges in Biomolecular Conformation Seen by Small Angle X-ray ScatteringSebastian DoniachView Author Information Departments of Applied Physics and Physics, Stanford University, Stanford California 94305 Cite this: Chem. Rev. 2001, 101, 6, 1763–1778Publication Date (Web):Ap…
The interaction of a laser-induced cavitation bubble with an elastic boundary is investigated experimentally by high-speed photography and acoustic measurements. The elastic material consists of a polyacrylamide (PAA) gel whose elastic properties can be controlled by modifying the water content of the sample. The elas…
The interaction of a laser-induced cavitation bubble with an elastic boundary and its dependence on the distance between bubble and boundary are investigated experimentally. The elastic boundary consists of a transparent polyacrylamide (PAA) gel with 80% water concentration with elastic modulus E = 0.25 MPa. At this E…
The crystal structure of human Mtcp1 was determined at 2 A resolution after the X-ray diffraction limit was improved by post-crystallization soaking in 2.0 M ammonium sulfate for 1-5 months. The effects of varying the ammonium sulfate concentration and addition of polyethylene glycol to the soaking solution were exami…
We conducted a 7-week laboratory incubation experiment to evaluate the effect of leaching on net C and N mineralisation in soils. The soils were collected from adjacent fields of long-term pasture and maize, where each field contained an Inceptisol and an Andisol. The concentration of clay mineral was 200 g/kg halloys…
We report the optical oscillations with monolayer periodicity observed by an oblique-incidence reflectance difference (OIRD) technique on the epitaxial growth of Nb-doped SrTiO 3 on SrTiO 3 substrate. The periodicity was verified by the simultaneously measured reflection high-energy electron diffraction intensity osci…
Reactions of [M(OEP)(OTf)] (M = Fe or Cr, OEP = octaethylporphyrinate, OTf = triflate) with [Re(N2)(PMe2Ph)4Cl] afford [(OEP)M(N2)Re(PMe2Ph)4Cl][OTf]. The structure of the heterometallic Fe/Re dinitrogen complex has been established by X-ray crystallography.