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。
This paper comprises the text of a review lecture on the subject of the effects of ultrasound upon mass transport, upon electrode surface phenomena, upon the behaviour of species and upon reaction mechanisms, and selected examples of the benefits of insonation in electroanalysis, electrosynthesis, electrodeposition an…
The structural evolution of a 2D hexagonal mesoporous silica powder during nitrogen adsorption at low temperature is followed by X-ray diffraction. The values for the pore radius and wall microporosity obtained with this technique compare well to the estimations drawn from volumetric measurements. It is further shown…
Antimony compounds are widely used as catalysts for the synthesis of the commercially important polymer poly(ethyleneterephthalate) by polycondensation of bis(hydroxyethyl)terephthalate. The precise nature of the antimony catalysts is, however, unknown. The present study has been conducted with a view to determining t…
This report describes the synthesis and supramolecular organization of a novel class of linear−dendritic block copolymers. The molecules, which are termed rodcoil dendrons, consist of a cholesterol moiety that is attached to l -lysine dendrons of three different generations via a biodegradable oligo( l -lactic acid) n…
The positive axial zero-field splitting parameter D relevant for the S = 2 ground state of [Mn(cyclam)I2]I (cyclam = 1,4,8,11-tetraazacyclotetradecane) is interpreted using the valence bond configuration interaction model which explicitly considers the covalency of the manganese-iodide bond.
An investigation was carried out of the molecular dynamics of poly( l -lactic acid) before, during, and after crystallization. Experimental results were generated over a wide range of temperature and frequency by broad-band dielectric relaxation spectroscopy (DRS). An interesting finding is that the average relaxation…
A new reversible isomerization cycle for meta-ferrocenylazobenzene accomplished by combination of a single green light (546 nm) and redox change between Fe(II) and Fe(III) was discovered. In the Fe(II) state, trans-to-cis isomerization proceeded upon the green light irradiation exciting the metal-to-ligand charge tran…
We present a new family of peptide dendrimers based on polyproline helices and cis-4-amino-L-proline as a branching unit. Dendrimers were synthesized by a convergent solid-phase peptide synthesis approach. The conformational transition between polyproline type I helix and polyproline type II helix was observed by circ…
We report the synthesis of the dibutyl derivative of poly(3,4-propylenedioxythiophene) as a regiosymmetric and soluble electroactive and photoluminescent conjugated polymer obtained in the neutral form by a Grignard metathesis coupling reaction. Molecular weights have been characterized by gel permeation chromatograph…
The conduction propertes of PVDF polymer gel electrolytes prepared by the phase inversion method were investigated through the diffusion coefficient and conductivity in order to confirm the conduction mechanism. The gel conductivity is associated with the total solution uptake which depends on the gelation process. Th…
We develop the extended dynamical mean field theory (E-DMFT) with a view towards realistic applications. {\bf 1)} We introduce an intuitive derivation of the E-DMFT formalism. By identifying the Hartree contributions before the E-DMFT treatment, it allows to handle systems in symmetry breaking phases within a simple f…
Two new polyoxetanes bearing dimesogenic pendants were prepared and their liquid crystalline properties were studied by differential scanning calorimetry (DSC), polarizing microscopy, and X-ray diffractometry. The dimesogens consist of cholesterol and biphenyl moieties connected through polymethylene spacers. Their bi…
ZnS quantum dots (QDs) synthesized in water and ethanol solutions were coated with polystyrene (PS) and SiO 2 shells, respectively. The band edge emission was enhanced by nearly five times after PS coating and by about thirteen times after SiO 2 coating, because the surface trap states were removed. From the photolumi…
The structure of the alpha-(Al,Si)CuFe approximant phase is determined by a single-crystal X-ray diffraction study and compared to the ideal structure obtained by the perpendicular shear method of the parent icosahedral phase. It is shown that the local environments (typical atomic clusters) of the two phases are simi…
Abstract Catalysis in electron transfer reactions between electron donors and acceptors is described and the important mechanistic insight is provided by showing a number of examples of both thermal and photochemical reactions that involve metal ion‐catalyzed electron transfer processes as the rate‐determining steps.…
The phase behaviour of a binary polymer blend of polyethylene glycol (PEG600) and polypropylene glycol (PPG1000) of low polydispersity was investigated. The coexistence curves of five different compositions, including the critical composition, were measured by differential refractometry. From the coexistence curves, t…
Abstract Carboxylic acid chloride end‐functionalized all‐aromatic hyperbranched polyesters were prepared from the bulk polycondensation of the AB 2 monomer 5‐(trimethylsiloxy)isophthaloyl dichloride. The acid chloride end functionality of the hyperbranched polyester was modified in situ with methanol and yielded methy…
Thirty years ago, automotive engineers perfected real-time damping for vehicle suspension systems prior to hitting bumps in the road. In the near future, architects and structural engineers may be able to use the same philosophy for tuning structures to withstand earthquakes as their waves impinge on the structure. Co…
1,4-Bis-(α-cyano-4-methoxystyryl)benzene (1a) and 1,4-bis-(α-cyano-4-methoxystyryl)-2,5-dimethoxybenzene (1b) were synthesized by the Knoevenagel reaction of (4-methoxyphenyl)acetonitrile with terephthaldicarboxyaldehyde and 2,5-dimethoxy terephthaldicarboxyaldehyde, respectively. Both phenylene vinylene oligomers are…
By copolymerization of 3-octylthiophene with thiophene containing aniline tetramer in the 3-position we have prepared a hybrid copolymer, poly(3-octyl-2,5-thienylene- co -3-oligoaniline-2,5-thienylene), exhibiting very interesting spectroscopic and spectroelectrochemical properties. The UV−vis−NIR spectrum of this new…