Materials Literature
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We present an exact calculation of the single-electron energies and wave-functions for any bound state in a realistic Si-SiO2 spherical quantum dot, including the material dependence of the electron effective mass. The influence of dot radius, confinement barrier potential and barrier-to-dot electron mass ratio on the…
The thermal 1,3-dipolar polycycloaddition of N,N ‘-dimethyl- p -phenylenedinitrone ( 3 ) and 4,4‘-hexanediyldioxydi( N -methyl- p -phenylenenitrone) ( 10 ) with N,N ‘-(1,4-phenylene)dimaleimide and 1,6-hexanediylbis(carbamic acid) bis( N -methyl- p -phenylenenitrone) ester ( 12 ) with 1,6-hexanediylbis(carbamic acid)…
GdCrSb 3 is an intermetallic compound with a structure containing alternating layers of Gd and Cr atoms. It undergoes long-range magnetic ordering at 92 K, as revealed by dc and ac magnetic susceptibility measurements, concomitant with a transition in the single-crystal electrical resistivity. These results imply more…
The dodecametallic Cr(III) cluster [Cr(12)O(9)(OH)(3)(O(2)CCMe(3))(15)] has a ground spin state of S = 6 characterized by the spin Hamiltonian parameters g(ZZ)() = 1.965, g(XX)() = g(YY)() = 1.960, D(S=)()(6) = +0.088 cm(-)(1), and E(S=)()(6) = 0 (where D and E are the axial and rhombic zero-field splitting parameters…
Systemic syntheses showed that the lead titanate pyrochlore phases formed under hydrothermal reactions in a certain range of KOH concentrations. The obtained pyrochlore phases all crystallize in the cubic structure. In comparison with typical pyrochlore structure, the O‘ site in Pb 2 Ti 2 O 6 O‘ is vacant. In addition…
The effects of cation symmetry and packing on the mixed-valence state of binuclear ferrocene derivatives are discussed separately by using chiral isomers and racemic modification of 1',1' "-bis(2-phenylbutyl)-1,1' '-biferrocenium pentaiodide. The pentaiodide anion has a polymeric structure and is composed of triiodide…
The first copper bis(selenosemicarbazone) complexes have been synthesized, using the ligands glyoxal bis(selenosemicarbazone), pyruvaldehyde bis(selenosemicarbazone), and 2,3-butanedione bis(selenosemicarbazone). Their spectroscopic properties indicate that they are structurally analogous to their well-known square-pl…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTMultilayer Formation Using Oppositely Charged Gold- and Silver-Dendrimer NanocompositesKunio Esumi, Shintaro Akiyama, and Tomokazu YoshimuraView Author Information Department of Applied Chemistry and Institute of Colloid and Interface Science, Tokyo University of Science, Kagur…
Recently, a considerable amount of research has centered on the synthesis of nanostructured hydrogels via the polymerization of monomers in lyotropic liquid crystal (LLC) phases. Because of the potential for controllable nanostructures, these materials have exhibited tremendous potential for a variety of applications.…
Copolymers of trimethoxysilylpropyl methacrylate (TMSPM) and methyl methacrylate (MMA) with varied composition and molecular weight were prepared as building blocks for transparent organic−inorganic hybrid materials. Thermally and chemically induced condensation of these network precursors after solvent evaporation re…
A photoresponsive coumarin derivative was grafted on the pore outlet of Si−MCM-41. Irradiation of UV light longer than 310-nm wavelength to this coumarin-modified MCM-41 induced the photodimerization of coumarin to close the pore outlet with cyclobutane dimer. Guest molecules such as phenanthrene neither can enter nor…
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Abstract The photodegradation of raw natural rubber and natural rubber compound film were studied using an artificial solar energy simulator. The properties of degraded rubber sheets containing benzophenone (BP) were determined by solution viscosity, 1 H‐NMR, and FTIR analyses. In the case of rubber compounds containi…
Abstract A novel electrocatalytic biosensor for glucose is reported that incorporate encapsulation of tetrathifulvalene‐tetracyanoquinodimethane (TTF‐TCNQ) functionalized organically modified sol gel glass (ormosil). The new ormosil is made using palladium‐linked glycidoxypropyltrimethoxysilane precursor, trimethoxysi…
Results of an experimental study on the solidification and convection of a ternary solution of H $_2$ O–CuSO $_4$ –Na $_2$ SO $_4$ when cooled from a vertical side boundary are presented. Cooling and crystallization at a sidewall result in the formation of horizontal gradients of composition and temperature which are…
Abstract Electrochemical properties of Fc‐PEM films have been studied by changing the chemical structure of the polymer chains and the content of Fc moiety in the film systematically. We have prepared a series of PEM films by a layer‐by‐layer deposition of polycations, Fc‐modified poly(allylamine) (Fc‐PAA) and poly(et…
Abstract The surface structure and physical properties of polyethylene glycol series polyurethane (PEG‐PU) membranes, in which were introduced hydrophobic polydimethylsiloxane (PDMS) component by the procedure of PU blending or of soft‐segment copolymerization, were studied in this investigation. In the case of the bl…
Abstract Iminoamino methylene bases intermediates are obtained by the decomposition of hexamethylenetetramine (hexamine). These are stabilized by the presence of strong anions such as SO and HSO , that is, “hexamine sulfate.” The effect of hexamine sulfate was closely linked to the strong buffering action it has on MU…
The interfacial tension between two low-molar-mass biphenylcarbonitriles that exhibit liquid crystalline phases (4‘-pentyl-4-biphenylcarbonitrile and 4‘-octyl-4-biphenylcarbonitrile) and poly(dimethylsiloxane) was measured as a function of temperature using pendant drop tensiometry enhanced by video-image digitization…
It is typical in smectic liquid crystals to describe elastic deformations with a linear theory when the elastic strain is small. In smectics, certain essential nonlinearities arise from the requirement of rotational invariance. By employing the Bogomol'nyi, Prasad, and Sommerfield decomposition and relying on boundary…