Materials Literature
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Self-assembled films of octadecyltrichlorosilane were patterned with regions of different chemical functionality using extreme ultraviolet interferometric lithography. Unexposed regions of the imaging layers remain terminated in methyl groups, and exposed regions are modified so as to be terminated with polar, oxygen-…
The electronic and geometrical structures of the ground and excited states of the 3d-metal dioxides ScO 2, TiO 2, VO 2, CrO 2, MnO 2, FeO 2, CoO 2, NiO 2, CuO 2, and ZnO 2 along with their singly charged negative ions have been calculated using the density functional theory with generalized gradient approximation for…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperparamagnetic Behavior in an Alkoxo-Bridged Iron(II) CubeHiroki Oshio, Norihisa Hoshino, and Tasuku ItoView Author Information Department of Chemistry, Graduate School of Science Tohoku University, Aoba-ku, Sendai 980-8578, Japan Cite this: J. Am. Chem. Soc. 2000,…
Stable icosahedral quasicrystals have been found in binary Cd-Ca and Cd-Yb systems in an as-solidified state as well as an annealed state. The icosahedral quasicrystals are identified to form at the composition of ${\mathrm{Cd}}_{85}{\mathrm{Ca}}_{15}$ and ${\mathrm{Cd}}_{84}{\mathrm{Yb}}_{16}.$ An electron diffractio…
Investigations have been carried out to clarify the binding interactions between two kinds of native DNA: one from salmon sperm (300−500 bp) and another from bacteriophage T4dC (166 kbp) and amine-terminated, diaminobutane core, poly(propylene imine) dendrimers (Astramol) of five generations (G1, G2, G3, G4, and G5).…
Der Lockruf des Goldes ertönt nicht nur in den Büchern Jack Londons, auch in den Labors der Katalyseforschung kann es zu einem Goldrausch kommen. Mit hoher katalytischer Aktivität ermöglichen Goldsalze Dominokupplungsreaktionen unter C-Heteroatom- und C-C-Verknüpfung. So sind furylsubstituierte Produkte 2 präparativ e…
This review focuses upon the following questions: a) Why are the polyelectrolytes adsorbed onto cellulosic fibres? The easiest way to describe the adsorption is as an interaction between the charges on the fibres and the charges on the polyelectrolytes. However the entropy gain upon the release of counterions to the c…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation and Characterization of Dendrimer-Encapsulated CdS Semiconductor Quantum DotsBuford I. Lemon and Richard M. CrooksView Author Information Department of Chemistry, Texas A&M University P.O. Box 30012, College Station, Texas 77842-3012 Cite this: J. Am. Chem.…
Properly designed organic molecules where a π-conjugated bridge is end-capped by an electron-donor and electron-withdrawing group (push–pull chromophores) can show, under specific conditions, frequency-upconverted lasing emission. Materials based on these dyes are therefore able to convert the emission of a cheap and…
The pore formation process of silica gel from tetraethoxysilane in the presence of citric acid (CA) was investigated. The silica gel prepared by pyrolysis of a composite of CA and silica had high specific surface area, ca. 1000 m 2 g -1 and its pore volume increased linearly with increasing CA content. In addition, th…
A new concept of polarization reversal and domain dynamics in modified ferroelectrics is presented. Accordingly, clusters with a reversed polarization within ferroelectric domains are nucleated under applied field in the vicinity of random fields around quenched defects. The random fields significantly lower the activ…
Irradiation with circularly polarized light of a film of an achiral azobenzene liquid crystalline polymer induces chirality. Circularly polarized light with opposite handedness produces enantiomeric structures. A chirooptical switch based on this phenomenon is reported.
The nuclear and magnetic structures of ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ have been investigated using neutron powder diffraction and M\"ossbauer spectroscopy at temperatures between 10 and 460 K. Fe and Mo atoms are found to order on alternate sites, as expected, giving rise to a double-perovskite-type unit cell…
The heterogeneity of food microstructure on mesoscopic scale plays a crucial role in the perception of food texture. Micro-rheology (the study of mechanical properties on a micrometer length scale) opens new perspectives for the study of “structure – function relationships” of food systems, and overcomes current limit…
The efflorescence problem in clay products and more specifically in construction bricks is a pathology which produce a decrease in the aesthetic quality of buildings. Their types and causes are very different and only a review of all the variables and classification can allow to start the understanding of this phenome…
This paper presents results on the physical and chemical properties of metakaolinite, MK which is prepared by dehydroxylation of high quality kaolinite. The properties of Portland cement mortars blended with MK additions up to 50% are investigated. These properties are compressive strength, pore size distribution, res…
Through the analysis of the different compounds (plaster + additives + E glass fibres) we pretend to demostrate that a synergic action is present between certain concrete additives (superfluidifiers, fluidiflers, and airingplasticizers) and E glass fibre, on the basis of the flection resistance of plaster matrix based…
This work describes a pegmatite mineral deposit composed by some veins of a length between 50 and 800 meters and a width of almost 15 meters. With the purpose to evaluate the potential exploitation, we have characterized the quality of the selling product, through a sampling procedure, granulometric classification, ma…
Lubricated squeezing flow (LSF) of a Herschel-Bulkley fluid between parallel disks under constant force was theoretically analyzed. An analytical expression for the fluid thickness as a function of time was obtained in terms of a hypergeometric function. The fluid thickness profiles in LSF were simulated for a range o…