Materials Literature
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The morphological development of crystallizable polymer blends has been investigated using optical microscopy and infrared and Raman spectroscopy. Both binary and ternary blends were studied. In each case, a crystallizable polyester, either poly(hexamethylene adipate) (PHMA) or poly(hexamethylene sebacate) (PHMS), is…
The magnetic properties of SrFeO 3 (SFO), CaFeO 3 (CFO) and Sr 2/3 La 1/3 FeO 3 (SLFO), which are perovskite iron oxides with a high valence state of Fe, have been investigated by high-pressure Mössbauer spectroscopy under external magnetic field. These perovskite oxides have been found to switch electronic ground sta…
Abstract Long-range-ordered, high-density gold (Au) nanodot arrays were prepared by vapor deposition using anodic porous alumina as a mask. The optical properties of such arrays were examined. The effects of highly ordered, high density arrangements of Au nanodots on the optical properties were elucidated by the depen…
Ge nanoparticles embedded in an oxide matrix have been obtained by (a) steam thermal oxidation at 650 °C of polycrystalline SiGe layers and (b) deposition of discontinuous Ge films/SiO 2 multilayers by low pressure chemical vapour deposition at 390 °C and thermal annealing at 700 °C. These two approaches are compared…
Electroactive conducting copolymers of aniline and 4,4‘-diaminodiphenyl sulfone (DDS) were prepared electrochemically. The cyclic voltammetric studies were carried out with different feed concentration of DDS on a glassy carbon electrode surface. The voltammograms exhibited different behavior for different concentrati…
Single-walled carbon nanotubes (SWCNTs) have been dispersed with three types of amphiphilic materials in aqueous solutions: (i) an anionic aliphatic surfactant, sodium dodecyl sulfate (SDS), (ii) a cyclic lipopeptide biosurfactant, surfactin, and (iii) a water-soluble polymer, polyvinylpyrrolidone (PVP). Solution phot…
The racemic hexacoordinate silicon(IV) complex tri(n-butyl)ammonium bis[citrato(3-)-O1,O3,O6]silicate (1) was synthesized by treatment of Si(OMe)4 with 2 molar equiv of citric acid and 2 molar equiv of N(n-Bu)3. The corresponding germanium analogue, tri(n-butyl)ammonium bis[citrato(3-)-O1,O3,O6]germanate (5; structura…
Abstract The hemiindigo derivative having a pyrrole ring exhibited photochromic and thermochromic properties in the presence of bovine serum albumin (BSA) in phosphate buffer solution.
Abstract Small-angle X-ray scattering (SAXS) was measured from CNT-dispersed resins and the data was analyzed in terms of a core-shell cylinder model. The structural parameters obtained from SAXS perfectly agreed with those from the electron microscopic observations. However, we found that SAXS was rather insensitive…
We review recent in situ neutron diffraction studies on the structural pressure dependence and the recrystallization of dense amorphous ices up to 2 GPa. Progress in high pressure techniques and data analysis methods allows the reliable determination of all three partial structure factors of amorphous ice under pressu…
Large numbers of multi-wall carbon nanotubes have been produced using a Co–Mo sol–gel catalyst with a high Mo/Co ratio. Carbon yields up to 4000% and carbon nanotubes with low levels of impurities have been obtained, pointing out the promoter character of Mo in the reaction. Therefore, the influence of Mo species has…
Recent studies have shown that semiconductor surfaces such as silicon and diamond can be functionalized with organic monolayers, and that these monolayer films can be used to tether biomolecules such as DNA to the surfaces. Electrical measurements of these interfaces show a change in response to DNA hybridization and…
Conjugated polymers (CPs) containing amino groups have been synthesized, and their optical properties in both solution and thin film have been studied. New monomers required for the synthesis of these polymers have been readily prepared via efficient synthetic routes. These monomers have been successfully polymerized…
The synthesis and materials properties of a new liquid crystalline phthalocyanine, octakis (2-benzyloxyethylsulfanyl) copper (II) phthalocyanine, 2, are reported. This phthalocyanine possesses eight benzyl-terminated side chains with thioether links to the Pc core, which promote greater interaction between the discoti…
The force generated by a polypyrrole (PPy) actuator operating under isometric conditions has been shown to decrease as the preload force applied to the actuator increases. The origin of the decrease in the force generated was found to be the change in modulus that occurs upon electrochemical stimulation of the polypyr…
Abstract Thermoelectric properties of camphorsulfonic acid (CSA) doped conducting polyaniline with different structures have been studied. The sample with special submicron-fibre structure exhibited 20 times higher thermoelectric power factor at 300 K than the sample with general grain structure, which could be ascrib…
Three types of heteropolyvanadates, [(C2H5)4N]4[PdV6O18] (1), [(C2H5)4N]4[Cu2V8O24] (2), and [(C6H5)4P]4[Ni4V10O30(OH)2(H2O)6] (3), were synthesized through the reaction between the [VO3]- anion and metal template cations of Pd(II), Cu(II), and Ni(II). The X-ray crystal structures of 1 (a = 29.952(4) A, b = 12.911(2)…
High surface area phosphosilicate glasses were synthesized by a new sol−gel method and characterized for structural, textural, and acid properties by X-ray diffraction, thermogravimetry/differential thermal analysis, IR spectroscopy (Fourier transform and diffuse reflectance Fourier transform), solid state 31 P and 29…
Three series of palladium(II) complexes 1 − 3 derived from 1,3,4-oxadiazoles exhibiting mesogenic properties are prepared and characterized. It was found that the formation of mesophases was sensitive to the numbers of alkoxy side chains. The compounds 3 appended with twelve side chains exhibited columnar (Col) phases…
We report on the formation of ordered arrays of micrometric holes on the surface of polystyrene (PS) films cast from volatile solvents in the presence of humidity at different temperatures. The formation mechanism is investigated for PS having different molecular weights, polydispersities, and carboxylic terminations.…