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。
A dipolar two-dimensional multifunctional (D-π) 3 -A dye molecule, 2,4,6-tris(4-( N -methyl- N -hexadecylamino)styryl)pyrylium tetrafluoroborate (P 3 ) was synthesized. The dye molecule was successfully transferred onto an ITO electrode or quartz by the Langmuir−Blodgett (LB) technique. The second-harmonic generation…
When the electrode separation is long or the applied voltage is low, the tree cannot directly grow to the plane electrode, and extinction of partial discharge (PD) with the re-growth of new channels can be observed after a long time. Before PD extinction, the light emission of the PD changes from the whole tree struct…
The scanning electron micrographs (SEM) were taken at different magnifications with respect of the fractured surfaces of the polymer composites prepared from unsaturated polyester resin and jute sliver with 60% fiber loading by weight. The composite specimens were prepared using both untreated (control) and chemically…
This review provides coverage of a variety of polysiloxane homopolymers and copolymers, and some related materials. Specific systems include (i) linear siloxane polymers [-SiRR'O-] (with various alkyl and aryl R and R' side groups), (ii) sesquisiloxane polymers possibly having a ladder structure, (iii) siloxane-silary…
The γ-radiolytic reduction of Hg 2+ in aqueous solution in the presence of 0.3 M 2-propanol first leads to Hg 2 2+ (ε 237 nm = 3.2 × 10 4 M -1 cm -1 ), and later to colloidal mercury. When the reduction is carried out in the presence of colloidal gold nanoparticles, Hg 2 2+ does not appear as an intermediate, and Hg 2…
The low-frequency acoustic breathing modes in Au−Pb core−shell nanoparticles have been studied by time-resolved spectroscopy. The frequency of the breathing mode was determined for a series of samples with a 47 nm diameter Au core and Pb shells of different thickness. The measured frequencies decrease with increasing…
This review provides coverage of a variety of polysiloxane homopolymers and copolymers, and some related materials. Specific systems include (i) linear siloxane polymers [-SiRR'O-] (with various alkyl and aryl R and R' side groups), (ii) sesquisiloxane polymers possibly having a ladder structure, (iii) siloxane-silary…
This review examines surface alignment of liquid crystals by exposure to light. Two distinct effects are discussed: illumination with polarized light induces a surface anisotropy to an alignment layer and hence a preferred in-plane orientation of the overlying liquid crystal director. Alternatively, a photochemical re…
The use of DAB-Am-64 amine dendrimer as a single-molecule template to produce mesoporous cavities in silica sol−gels is reported. The method is meant to afford the synthesis of spheroidal cavities and is likely to enjoy generality, since there are a number of dendritic molecules commercially available today. X-ray dif…
Exposure to ultrasonic acoustic waves can greatly enhance various chemical reactions. Ultrasonic acoustic irradiation of organic compounds in aqueous solution results in oxidation of these compounds. The mechanism producing this behavior is the inducement of the growth and collapse of cavitation bubbles driven by the…
We present first-principles calculations of electron-electron scattering rates of low-energy electrons in Au. Our full band-structure calculations indicate that a major contribution from occupied d states participating in the screening of electron-electron interactions yields lifetimes of electrons in Au with energies…
The magnetic interaction between a 5f element and a 3d transition metal in a molecular compound was investigated with a novel class of complexes in which the central UIV ion is associated with two MII ions by means of a hexadentate Schiff base ligand (see picture). The comparative study of the Cu2U, Zn2U, and Cu2Zr co…
We present a study of the adsorption of two peptides at the octane-water interface. The first peptide, Lac21, exists in mixed monomer-tetramer equilibrium in bulk solution with an appreciable monomer concentration. The second peptide, Lac28, exists as a tetramer in solution, with minimal exposed hydrophobic surface. A…
The electronic structure of successive redox states of two series of thienylenevinylene oligomers (nTVs, n=4, 5, 6, 8, and 12) that carry hexyl substituents at the alpha- or beta-positions in order to increase the solubility was investigated in detail by means of UV/ Vis/near-IR and ESR spectroscopy in solution. The n…
Compounding extruders are still designed based on experience and time-consuming experimental examinations. This work investigates the morphology development of incompatible polyblends along a mixing zone at the end of a corotating twin-screw extruder. During the process, the samples are taken from the running extruder…
Concerted cleavage of two C−C single bonds provides the basis for a novel concept for the storage and release of electrons. Electron transfer, mediated by metal ions, occurs between the cyclopropyl ring of a Ni porphyrinogen and the interligand C−C bond of a bis(Ni-salophen) complex (see scheme).
Reaction of the thiol-terminated fourth-generation dendrimer 2-G4 (96 SH groups) with the gold cluster compound Au55(PPh3)12Cl6 in a 3:1 molar ratio in dichloromethane results in the formation of bare Au55 clusters. The cuboctahedrally shaped Au55 particles coalesce to well-formed microcrystals (Au55) infinity. The ro…
The by no means trivial, solid-state reaction for the condensation of {(Mo)Mo5}12Fe30 giant spheres commences through the water ligands and leads to oxo (or hydroxo) bridging. As the discrete icosahedral units approach each other, their oxygen atom bridges ultimately form covalent bonds (Fe−Fe 3.79 Å, see picture) to…
Es wird eine chemische Betrachtung spinmagnetischer Phänomene in abgeschlossenen (Atome und Moleküle) und unendlich großen Systemen (Übergangsmetalle und ihre Legierungen) vorgestellt, die auf den Konzepten von Bindung und elektronischer Abschirmung basiert. Der Ansatz soll als halbquantitative Richtschnur für die Syn…
The role of the ligand's structure and absolute configuration in the supramolecular chirality induction in achiral bis(zinc porphyrin) has been studied. The amines with bulkier substituents resulted in stronger CD signals due to increased helical displacement in the anti conformer. All the amines with an R absolute co…