Materials Literature
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A series of hexaarylbenzenes (1–6) with a variety of different aryl arms (i.e. phenyl, biphenylyl, mono-, bi-, and terthienylyl) around a benzene core, decorated with flexible dodecyl chains on the terminal positions, were synthesized. Their mesomorphic behaviors were studied by differential scanning calorimetry (DSC)…
The formation of mesostructured silica was investigated using acidic conditions with tetraethoxysilane (TEOS) as the silica precursor and cetyltrimethylammonium bromide (CTAB) as the structure directing agent. A synthesis mixture of composition 2.2TEOS ∶ 1.1CTAB ∶ 75HCl ∶ 1000H2O gave a well ordered material exhibitin…
The hydrothermal reaction of MoO3, Cu(C2H3O2)2.H2O, tpypyz, H3PO4 and H2O yields a 2D material, [(Cu2(tpypyz)(H2O)2)(Mo5O15)(HOPO3)2].2H2O (1.2H2O), constructed from (Mo5O15(HOPO3)2)4- clusters linked through (Cu2(tpypyz)(H2O)2)2+ components; in contrast, use of Cu2O in the synthesis in place of Cu(C2H3O2)2.H2O yields…
Ti-45 wt % Nb (30 atom % Nb), and Ti-50 wt % Zr (34.4 atom % Zr), with the alloying elements in solid solution, exhibited reduced active anodic dissolution rates in comparison with commercially pure titanium (C. P. Ti) in deaerated hydrochloric acid (HCl) at 37°C. Furthermore, the alloying additions of niobium (Nb) an…
This paper studies the possibility of applying a gas mixture containing c-C/sub 4/F/sub 8/ in the gas insulation of power equipment. Environmental aspects such as global warming potential, ozone depletion potential, recycling loss and toxicity are discussed. Insulation characteristics of gas mixtures such as c-C/sub 4…
This book presents a comprehensive treatment of both functional and decorative textiles used in the automotive industry including seat covers, headliners, airbags, seat belts and tyres. Written in a clear, concise style it explains material properties and the way in which they influence manufacturing processes as well…
The shape of a small liquid drop on a small diameter fiber may be either an axisymmetric barrel shape or it may be a non-axisymmetric clam-shell shape. Experiments show that when the reduced volume, given by the volume of droplet divided by the fiber radius, is large the barrel shape is the preferred conformation, but…
A short-range force constant model was applied for the first time to investigate the phonons in A2Ti2O7 (A = Y, Sm, Gd, Yb) pyrochlores in their cubic phase of space group Fd3m. The calculations of phonons were made with five stretching and four bending force constants. The calculated values of Raman and infrared wave…
A new self-assembling system is developed, based on dithienylcyclopentene photochromic switches, which forms extended aggregates in solution and for which the viscosity can be changed by light.
The synthesis of a new soluble conjugated porphyrin polymer 4 is reported. The MALDI TOF mass spectrum shows the presence of oligomers with up to 13 repeat units and GPC gives a Mn of 53 kDa. The electronic absorption spectra of this polymer exhibit an intense Q band at 800 nm in solution and 853 nm in the solid state…
The thermo-mechanical analysis of some novel, totally bioactive, three-component composite systems intended for the repair and augmentation of bone has been performed. The composites are composed of hydroxyapatite (HA), particulate reinforced biodegradable polylactic acid (PDLLA), with a second reinforcing phase of se…
The factors influencing the level of U‐232 contamination in U‐233 are examined for heavy‐water‐moderated, light‐water‐moderated and liquid‐metal cooled fast breeder reactors fueled with natural or low‐enriched uranium and containing thorium mixed with the uranium or in separate target channels. U‐232 decays with a 69‐…
The hydrothermal reaction of CuSO(4).5H2O, Na2MoO(4).2H2O and 2,2'-bipyridine with the bridging diphosphonate ligand H2O3P(CH2)4PO3H2 yields the one-dimensional chain [(Cu(bpy)2)(Cu(bpy)(H2O)2)(Mo5O15)(O3P(CH2)4PO3)].H2O; the introduction of a second bridging component in the reaction of Cu(MeCO2)2.H2O, MoO3, H2O3PCH2…
A family of polymeric 1-dimensional chains of iron(II) species showing the spin-crossover phenomenon has been synthesized using 4-n-alkyl-1,2,4-triazoles as bridging ligands. The influence of the length of the alkyl tails on the triazole ligands on characteristic features of the spin transition was studied, showing de…
In this paper, we report the electrochemical fabrication of highly ordered Au nanowire arrays within hexagonal close-packed nanochannel alumina (NCA) templates with pore diameters ranging from 35 nm to 100 nm. The observations of TEM, SAED, and HRTEM show that single crystal Au nanowires have been obtained within the…
Electric Double Layer Capacitance of Highly Porous Carbon Derived from Lithium Metal and Polytetrafluoroethylene , Shiraishi, Soshi, Kurihara, Hideyuki, Tsubota, Hiroki, Oya, Asao, Soneda, Yasushi, Yamada, Yoshio
Polyvinylpyrrolidone (PVP)–Ag2S nanocomposites were successfully prepared through in-situ reaction with CS2 as the sulfur source in ethanol solution at room temperature. Transmission electron microscopic (TEM) analysis of the nanocomposites revealed a raspberry morphology of the inorganic component with an average par…
Crystallization is often employed for purifying a drug substance. Use of different solvents and processing conditions may change the crystal habit, besides altering the polymorphic state. Furthermore, altered habit may result from crystal growth during storage. Hence, there is a need to understand the factors influenc…
Lyotropic liquid crystalline phases formed at high concentrations of nonionic surfactants provide a versatile templating medium that can be used to produce nanostructured materials with regular arrays of pores of nanometer dimension and extended periodicity. In this work, we have used this technique to prepare nanostr…
Polyesters containing thiolate chain end were obtained from the “controlled” ring-opening polymerization (ROP) of ε-caprolactone or δ-valerolactone initiated by several novel aluminum thiolates. The initiators, [(MOBT) 2 AlR] ( 1, R = Me; 2, R = Cl) can be obtained in high yield from the interaction of Me 3 Al or Et 2…