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。
Lanthanide complexation chemistry in solution is an active research theme because of the importance of gadolinium complexes as contrast agents in magnetic resonance imaging, and of luminescent europium and terbium complexes as probes in biochemistry. The physicochemical principles and theory underpinning this work are…
A new class of sterically hindered dendrimer-metalloporphyrins was synthesized for use as shape-selective oxidation catalysts. A series of oxidatively robust poly(phenylesters) dendrimers were prepared through a convergent synthesis. Monodendrons were appended to the meta -positions of the 5,10,15,20-tetrakis(3‘,5‘-hy…
Hexagonal mesoporous titanosilicates with distinguishable framework charges and textural mesoporosity, namely, Ti-MCM-41 and Ti-HMS, were prepared at ambient temperature by electrostatic and neutral assembly processes, respectively. Titanium incorporation at the 2 mol % level for both materials was accompanied by incr…
Fatigue damage accumulation and failure modes of several unidirectional and angle-ply SCS-6 fiber-reinforced titanium matrix composites are reviewed. The fatigue damage characteristics of the notched and unnotched composites were classified using several schematic diagrams based upon the constituent's properties and l…
Gallium oxide thin films have been deposited by atomic layer epitaxy (ALE) using Ga(acac)3(acac = pentane-2,4-dionate) and either water or ozone as precursors. Films were grown on silicon (100), soda lime and Corning glass substrates. The influence of the deposition parameters (e.g. pulse duration, growth and source t…
The Application of Computational Chemistry to the Study of Molecular Materials On the Crystallographic and Statistical Mechanical Foundations of the Hartman-Perdok Theory An Ab Initio Approach to Crystal Structure Determination Using High Resolution Powder Diffraction and Computational Chemistry Techniques An Automate…
In Team Toyota Besser presents the results of an in-depth study of Toyota's assembly plant in Georgetown, Kentucky. Based on employee interviews, analyses of company publications, newspaper accounts, interaction with company employees and attendance at company events over a five-year period, this book documents how To…
The platinum tip of a scanning tunneling microscope is employed to direct the electropolymerization of aniline on nanometer-scale regions of a graphite surface which is immersed in an aqueous, aniline-containing electrolyte. The electropolymerization of aniline is initiated by two bias voltage pulses which are applied…
A new type of ring-opening monomer has been investigated and found to undergo facile and efficient free-radical polymerization. The monomers are cyclic allylic sulfides with 6-methylene-1,4-dithiepane ( 3 ) and 3-methylene-1,5-dithiacyclooctane ( 4 ) synthesized and investigated as two examples. 6-Methylene-1,4-dithie…
Linear polystyrene of M w = 330 000 and M w / M n = 1.04 in which 50% and 100% of the phenyl residues were chloromethylated were heated in a 0.5 g/L ethylene dichloride solution in the presence of SnCl 4 to convert them into an intramolecularly hyper-cross-linked soluble material. The spherical macromolecular species…
In this article information about various methods of liposome preparation (including the large scale manufacture) has been reviewed. The advantages and disadvantages of the methods have been described in terms of size distribution and encapsulation efficiency.
Surface-enhanced Raman spectroscopy (SERS) is evaluated as a quantitative analytical tool for low concentrations of melamine and melamine derivatives in solution. Substantial variations in absolute and relative intensities of SERS bands were encountered using silver sols, which cannot be controlled. Alternatively, it…
In dilute solution, semicrystalline diblock copolymers with one crystallizable block form thin platelet structures consisting of a chain-folded crystalline domain between solvated layers of the amorphous block chains. The amorphous block is attached to the crystalline fold surface, forming a model system of tethered c…
ABSTRACT The potential of fruit purees as edible mass transfer barriers was studied. Water vapor and oxygen permeabilities (WVP and O 2 P) of peach puree films were evaluated at different relative humidities (RH) and temperatures (T). Peach puree was not a good water barrier. Peach and apricot films exhibited lower WV…
The effects of particlesize and heating temperature of magnesium oxide (MgO), calcium oxide (CaO), and zinc oxide (ZnO) powders on the antibacterial activities of their slurries were studied by the conductance method. An increase in particle size of the powders reduced their antibacterial activity. The variation of ac…
The complex trans-[RuVI(tmp)(O)2] 1 (tmp = dianion of 5,10,15,20-tetramesitylporphyrin) catalytically dehydrogenates primary and secondary amines in the presence of air; possible reaction steps involve a disproportionation reaction that generates a RuII intermediate, as evidenced by the isolated bis(benzylamine) compl…
The nitrogen and carbon activities are the cardinal parameters for process control of nitriding, nitrocarburising, carburising, and carbonitriding. The essential elements of the thermodynamic background for the definition of the so called nitrogen and carbon activities in nitrided and carburised surface layers of iron…
Narrowing the size distribution of polydisperse CdS nanocrystals whose average diameter was 42 Å and standard deviation was 19 Å was achieved utilizing size selective photocorrosion with sequential irradiation with monochromatic light whose wavelength was changed step by step from 490 to 430 nm in air-saturated sodium…
Three cyclic initiators were prepared from dibutyltin oxide and 1,2-ethanediol, 2-mercaptoethanol, and 1,2-dimercaptoethane. Mass spectra demonstrated in agreement with literature data that the tin compounds obtained from 1,2-ethanediol and 2-mercaptoethanol form dimeric 10-membered rings. Polymerizations of l -lactid…
By codoping Dy3+ into the SrAl2O4:Eu2+ phosphor, long persistent phosphorescence was observed and its afterglow characteristics were investigated. The excitation wavelength suitable for long persistent phosphorescence was 200-250nm, much shorter than the wavelength of 4f7-4f65d absorption of the Eu2+ ions, suggesting…