Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The synthesis and characterization of two rhodium(I)dicarbonyl amethyrin complexes (mono and bis) are presented. X-ray structural results reveal that the amethyrin ligand undergoes significant distortion from planarity as the result of metal complexation and that, in the case of the bis-rhodium complex, the two metal…
Liquid crystals are of major technological importance for display devices, as well as being of fundamental molecular interest. Understanding how their building-block molecules arrange themselves is critical for obtaining improvements in performance. In their research commentary, Heppke and Moro discuss recent findings…
The triplet-photoexcited [5,10,15,20-tetrakis(4-sulfonatophenyl)porphinato]zinc(II) ( 3 ZnTPPS 4- ) ion underwent rapid one-electron oxidation by a series of N -alkyl-4-cyanopyridinium (C n CP + ) ions. In aqueous solution, the quenching rate constants ( k q ≅ 4 × 10 9 M -1 s -1 ) were insensitive to the N -alkyl chai…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTControlling the Selective Light Reflection of a Cholesteric Liquid Crystal of (Hydroxypropyl)cellulose by Electrical StimulationYoshiyuki Nishio, Toshinori Kai, Noritaka Kimura, Kazuhiro Oshima, and Hidematsu SuzukiView Author Infor…
Reaction of the ynamine MeC⋮CNEt 2 with the pentatetraenylidene complexes [(CO) 5 M C C C C C(NMe 2 ) 2 ] (M = Cr ( 3a ), W ( 3b )) at room temperature affords the new heptapentaenylidene complexes [(CO) 5 M C C C C C(NEt 2 )C(Me) C(NMe 2 ) 2 ] (M = Cr ( 5a ), W ( 5b )) in good yield. The spectroscopic data and the X-…
Bulk crystallization is emerging as a new industrial operation for protein recovery. Characterization of bulk protein crystallization is more complex than protein crystallization for structural study where single crystals are grown in flow cells. This is because both nucleation and crystal growth processes are taking…
We study monolayers formed at an air−water interface on a Langmuir trough by telechelic poly(ethylene oxide) polymers end capped with hydrophobic alkane groups (C 12 and C 16 ). The pressure−area isotherms show two plateaus: the first plateau at low coverage already exists for nontelechelic PEO and is attributed to th…
A series of perylene-containing polyimides and copolyimides have been synthesized and characterized by DSC, TGA, NMR, UV−vis, and X-ray powder diffraction measurements. Xerographic electrical measurements indicated that perfectly alternating copolyimides had higher photosensitivities than those of homopolyimides and r…
The laser-induced anisotropy in thin films of an extensive number of cyanoazobenzene side-chain liquid crystalline polytetradecanedioates, -dodecanedioates, and -adipates selectively deuterated at different positions have been investigated with polarized FTIR spectroscopy. The analysis of the segmental orientation bas…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEnhancing the Degree of Branching of Hyperbranched Polymers by Postsynthetic ModificationChristian Lach and Holger FreyView Author Information Freiburger Materialforschungszentrum FMF and Institut für Makromolekulare Chemie der Albe…
Poly( N -vinylpyrrolidone)-stabilized polystyrene (PS) latexes have been coated with thin overlayers of polyaniline (PANi) to produce electrically conductive “core−shell” particles. In this work we focused on the morphology of the PANi overlayer, the colloid stability of the coated latexes, and electrical conductivity…
Polyaniline base was protonated by blending with camphorsulfonic and picric acids in the solid state. The electrical conductivity of the equimolar mixture was more than 10 7 times higher compared with the conductivity of components used for blending. The electrical conductivity still increased several times after heat…
A silicalite-1 nanophase material with an elementary particle size of 18−100 nm is synthesized from clear solution and isolated and purified using supercentrifugation. The nanopowder is characterized in detail using scanning electron microscopy, high-resolution transmission electron microscopy, attenuated force micros…
We investigate both numerically and analytically the convective instability of granular materials by two dimensional traffic equations. In the absence of vibrations the traffic equations assume two distinctive classes of fixed bed solutions with either a spatially uniform or nonuniform density profile. The former one…
The molecular ion H3+ is considered the cornerstone of interstellar chemistry because it initiates the reactions responsible for the production of many larger molecules. Recently discovered in dense molecular clouds, H3+ has now been observed in the diffuse interstellar medium toward Cygnus OB2 No. 12. Analysis of H3+…
Introduction to the microstructural dependence of properties introduction to, and perspective on, the porosity dependence of properties porosity dependence of elastic properties at low to moderate temperatures porosity dependence of fracture energy and toughness, and related crack propagnation at 22C porosity dependen…
Detailed studies of elementary chemical processes on well-characterized single crystal surfaces have contributed substantially to the understanding of heterogeneous catalysis. Insight into the structure of surface alloys combined with an understanding of the relation between the surface composition and reactivity is s…
The paper introduces new developments of the original AREA method. A rigorous mathematical proof that the equilibrium points are the only ones which satisfy the maximum AREA criterion in the case of a two-component, two-phase system is given for the first time. A rigorous proof that the maximum AREA criterion is a nec…
Multilevel hysteresis comparators are discussed, including a new quasi-form, which incorporates standard hysteresis with error reference levels, for use in direct torque control schemes for induction motors.
The sequential bond dissociation energies (BDEs) for M + (NH 3 ) x ( x = 1−4) for M = Ti−Cu are determined by examining the collision-induced dissociation reactions with xenon in a guided ion beam mass spectrometer. In the cases of Fe, Co, Ni, and Cu, the BDE for the second ammonia molecule is determined to be greater…