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。
(2-Nitro-5,10,15,20-tetraphenylporphyrinato)nickel(II) reacts with α-isocyanoacetic esters in the presence of DBU to give the first β-fused pyrroloporphyrins, the pyrrole ring in the fused system being shown to undergo typical pyrrole-type chemistry; the corresponding zinc(II) complex affords a novel cyclopropanochlor…
Cs, Ag, and Zn behave in a different way when deposited on surfaces of ultrathin (15−20 Å) films of alumina. In the case of Cs/Al 2 O 3, the alkali atoms wet the oxide, forming strong chemisorption bonds. At small coverages of Cs, desorption of the alkali occurred between 600 and 1000 K. As the amount of Cs deposited…
A technique is introduced for the theoretical prediction of electronic spectra of lanthanide complexes by replacing the metal ion by a point charge with the ligands held in their positions as determined by the SMLC/AM1, and by computing the theoretical spectra via the intermediate neglect of differential overlap/spect…
In a former paper, the dimensional properties of degraded starch fractions of different molar masses were reported. The behavior was found to be dominated by the highly branched amylopectin. The same samples are now investigated in semidilute solution by static−dynamic light scattering. The deviating values of the ove…
In 1887, Kelvin posed one of the most discussed scientific questions of the last 100 years - the problem of the division of three-dimensional space into cells of equal volume with minimal area. It has interested mathematicians, physical scientists and biologists ever since and the problem has scientific relevance to f…
A series of lead zinc phosphate glasses containing 30-80 mol% P 2 O 5 , 0-60%PbO and 0-60%ZnO have been prepared and characterised. The composition dependence of density, melting temperature(T m ), vitrification range, thermal behaviours (thermal expansion coefficient, glass transformation temperature, Tg and softenin…
This paper describes the results of investigation into the influence of a kind of nonsoluble contaminant (Tonoko or Kaolin) on flashover voltages of artificially contaminated insulators. The deposit density of Kaolin on the insulator surface is less than that of Tonoko when contaminated with the suspension containing…
Vapor deposition of a 45-Å layer of silver and a subsequent 50−65-Å layer of SiO 2 onto a glass slide is shown to be a viable substrate for surface-enhanced Raman spectroscopy (SERS) and a model of the silica surface suitable for adsorption kinetic studies. The chemistry of the silica is characterized by UV absorption…
The NMR spectra of polyamide 46/polyamide 6I copolymers, which were obtained by reaction in the molten sate, are studied. Using 13 C NMR, a physical blend of polyamide 46 and polyamide 6I and a polyamide 46/polyamide 6I copolymer could be discriminated. Four kinds of diad sequences are observed in the carbonyl resonan…
The adsorption of different ethoxysilanes on Al was studied. It was established that during polymolecular adsorption of ethoxysilanes from the vapor phase on aluminum the first monolayer is adsorbed irreversibly with adsorption van der Waals bonds between silane molecules and the aluminum surface. The covalent bonding…
Chain-folded single crystals of the five even−even nylons 4 4, 6 4, 8 4, 10 4, and 12 4 were grown from solution and their structures and morphologies studied using transmission electron microscopy, both imaging and diffraction. Sedimented mats were examined using X-ray diffraction. All these nylons have room temperat…
In catalysis, it has been suggested that the addition of CeO2 and other rare-earth metal oxides to alumina can stabilize the surface area and the spinel transition phases of the alumina support used in automotive catalysis. As this structural stabilizing effect by CeO2 was recently observed to occur only to a very lim…
A new family of nonionic water-soluble lutetium bisphthalocyanines and a copper monophthalocyanine have been synthesized and characterized. Optical absorption determinations demonstrate aggregation processes in water. Optical microscopy, differential scanning calorimetry (DSC), and X-ray diffraction measurements have…
Absorption and emission spectra of monomers and dimers of [tetramethoxytetrakis(octyloxy)phthalocyaninato]silicon have been measured as a function of solvent and concentration. In contrast to the monomer, the fluorescence of the dimer is shifted to lower energy by about 4000 cm -1, and the emission quantum yield is re…
The addition of calcium (1.23−9.73 mg/g of protein) during neutralization of isoelectric precipitate modified the thermal behavior of soybean protein isolates. In the samples that did not undergo thermal treatment, the calcium content increase caused an increase in thermal stability, especially in the 11S fraction, bu…
The preparation of poly(dimethylsiloxane)s having part of the siloxane units substituted with a model organic thioether was investigated. The sulfur group was generated by the ene−thiol addition to the vinyl function bound to silicon. Two synthetic routes to this copolymer were compared (i) one-step kinetically contro…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSegmental Relaxation in Poly(dimethylsiloxane)C. M. Roland and K. L. NagiView Author Information Naval Research Laboratory, Washington, D.C. 20375-5320Cite this: Macromolecules 1996, 29, 17, 5747–5750Publication Date (Web):August 12, 1996Publication History Received12 January 1…
Designing basketball uniforms for female athletes is a challenge for soft goods manufacturers. Data were collected from 503 female collegiate basketball players concerning body cathexis, body form, garment fit satisfaction, uniform design preferences and demographic characteristics. Of the three areas of the body (upp…
By incorporating high molecular weight poly(styrenesulfonate) as the counter-ion in poly(aniline) films good electroactivity and stability can be achieved for the resulting molecular composite in buffered aqueous solution at pH 7. For short times (e.g. 30 min) in pH 7 solution the redox process is reversible and repro…
The second-order nonlinear optical response of amine and phenol/ether derivatives ( 1 − 8 ) has been evaluated using experimental and theoretical techniques. Electric-field-induced second-harmonic generation (EFISH) measurements establish that N -phenyl substitution of 4-nitroaniline ( 1 ) produces a greater increase…