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 first discrete, selenium-centered tetranuclear zinc cluster [Zn4(mu4-Se)[Se2P(OPr)2]6] was isolated and characterized. The cluster consists of six edge-bridged dsep ligands with four zinc atoms in a slightly distorted tetrahedron and a mu4-Se atom in the center. In addition, 12 mu2-bridging selenium atoms form a S…
In this work, the thermal conductivity of nanofilms, nanowires, and nanoparticles are studied using molecular dynamics simulation. It is found that their thermal conductivity depends significantly on the characteristic size until it reaches a large value. Comparison with results of the lattice Boltzmann method reflect…
Abstract Based on 1,4‐succinic acid, 1,4‐butanediol, poly(ethylene glycol)s and dimethyl terephthalate, biodegradable segmented multiblock copolymers of poly[(butylene terephthalate)‐ co ‐poly(butylene succinate)‐ block ‐poly(ethylene glycol)] (PTSG) were synthesized with different poly(butylene succinate) (PBS) molar…
Abstract The synthesis of a novel nonlinear optical (NLO) chromophore with threefold symmetry − 2,5,8‐tris(diethylamino)‐1,3,4,6,7,9,9b‐heptaazaphenalene ( 4 ) − is reported. Compound 4 was synthesized from 2,5,8‐trichloro‐1,3,4,6,7,9,9b‐heptaazaphenalene ( 3 ) through a nucleophilic aromatic substitution, its structu…
Polymeric substrates of different surface chemistry and length scales were found to have profound influence on cell adhesion. The adhesion of fibroblasts on surfaces of oxidized polystyrene (PS), on surfaces modified with random copolymers of PS and poly(methyl methacrylate) [P(S-r-MMA)] with topographic features, and…
Golden prospects: Monolayers of the fourth-generation dendrimer G4-SH, which is decorated with 96 terminal thiol groups (see picture), bind Au55(PPh3)12Cl6 clusters as monolayers under inert conditions. In an atmosphere of CH2Cl2 the clusters begin to move and lose their ligand shell, which leads to the formation of n…
Abstract The thermodynamic miscibility and thermal and dynamic mechanical behaviour of semi‐interpenetrating polymer networks (semi‐IPNs) of crosslinked polyurethane (PU) and linear poly(hydroxyethyl methacrylate) (PHEMA) have been investigated. The free energies of mixing of the semi‐IPN components have been determin…
We investigate two-dimensional melting of a colloidal system in the presence of a one-dimensional periodic substrate potential created by two interfering laser beams. We study the commensurability ratio p=sqrt[3]a/2d=2 with a the mean particle distance and d the period of the periodic potential. In contrast with the p…
Abstract The critical role of the ionic conductivity properties of materials in the development of Intermediate Temperature Solid Oxide Fuel Cell (IT‐SOFC) technology has been emphasized over the past decade. However, from a fundamental point of view, little is known of the physicochemical parameters influencing ionic…
Einen gewellten, schichtartigen [Si2O2N2]2−-Anionenverband, der aus Dreierringen aufgebaut ist, enthält das Schichtsilicat Ca[Si2O2N2] (siehe Bild). Die ungewöhnliche Struktur ergibt sich aus der Tatsache, dass die N-Atome, anders als die O-Atome in Oxosilicaten, jeweils drei benachbarte Si-Tetraederzentren in den Sch…
The corrosion inhibition of carbon steel in 3% de-aerated NaCl acidic solution with amine–fatty acid corrosion inhibitor, KI384, was investigated at different temperatures using potentiodynamic polarization technique. The Corrosion rate was calculated in the presence and absence of inhibitor. The inhibition increased…
The effects of multiple-beam interference within a series of wave plates whose principal axes are rotated with respect to each other are explored. This is done by expanding the formulation of the matrix algebra which was originally developed for multilayer thin-film optics. As an important example, the new method has…
The adsorption of acetaldehyde and its coadsorption and reaction with NO 2 were investigated on a Na−Y,FAU zeolite using in situ FTIR spectroscopy. Acetaldehyde adsorbs strongly over Na−Y and desorbs molecularly at around 400 K with very limited extent of condensation or polymerization. Reaction between CH 3 CHO and N…
The magnetic properties of the layered compound ${({\mathrm{C}}_{2}{\mathrm{N}}_{2}{\mathrm{H}}_{10})}_{1∕2}\mathrm{Fe}\mathrm{P}{\mathrm{O}}_{4}(\mathrm{O}\mathrm{H})$ have been studied using dc magnetization and ac susceptibility measurements. The compound orders as a canted antiferromagnet at ${T}_{c}=29.6\phantom{…
Abstract Summary: In the present study, the compatibility, properties and degradability of polyolefin/lignin blends have been studied. Blends of three maleic anhydride grafted copolymers of ethylene‐propylene rubbers containing various content of functional groups with epoxy‐modified lignosulfonate have been investiga…
Abstract The use of trans ‐polyoctylene rubber (TOR) as a compatibilizer for blends of natural rubber (NR) and acrylonitrile‐butadiene rubber (NBR) was investigated using atomic force microscopy (AFM) and dynamic mechanical analysis (DMA). The NR/NBR blends containing varying proportions of TOR were prepared in an int…
Abstract Graft copolymers of poly(vinyl alcohol) with thiophene side‐groups and pyrrole were synthesized by electrochemical polymerization methods. Poly(vinyl alcohol) with thiophene side‐groups (PVATh) was obtained from the reaction between poly(vinyl alcohol) (PVA) and thiophene‐3‐acetic acid. The syntheses of copol…
The exfoliated single-layer titanate can rapidly restack and reversibly release heme protein simply by adjustment of the pH value. The composites have regularly layered structure and powdery morphology by their ideal layer-to-layer assembly, which provides the titanate nanosheet an unusual specific intercalation capac…
Eine Röhre für Elektronen: π-π- und Coulomb-Wechselwirkungen halten den Komplex aus Kohlenstoffnanoröhren, die Pyren+ (1) tragen, und dem Zinkporphyrinkomplex 2 zusammen. Der Photoanregung des Donor-Acceptor-Systems folgt eine rasche und effiziente Ladungstrennung. Der dabei gebildete Zustand hat eine Lebensdauer von…
Abstract Summary: The title polymers, in which both the stem and the graft are biodegradable, have been synthesized for the first time in a one‐pot, lipase‐catalyzed, graft‐polymerization reaction (in bulk, at 70 °C) of β ‐butyrolactone ( β ‐BL) and ε ‐caprolactone ( ε ‐CL) onto chitin and chitosan. The reactivity ord…