Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAssembly of Organic Molecules on Silicon Surfaces via the Si−N LinkageW. F. Bergerson, J. A. Mulder, R. P. Hsung, and X.-Y. ZhuView Author Information Department of Chemistry, University of Minnesota Minneapolis, Minnesota 55455 Cite this: J. Am. Chem. Soc. 1999, 121,…
An unprecedented coupling reaction of heteroatom-containing tripyrranes leads to the formation of core-modified sapphyrins 1 and 2, which self-assemble in the solid state to form supramolecular ladders. Weak C-H⋅⋅⋅S and C-H⋅⋅⋅Se hydrogen-bonding interactions in addition to C-H⋅⋅⋅N hydrogen bonds are responsible for th…
Blower doors are used to measure the airtightness and air leakage of building envelopes. As existing dwellings in the United States are ventilated primarily through leaks in the building shell (i.e., infiltration) rather than by whole-house mechanical ventilation systems, quantification of airtightness data is critica…
We have studied the critical behaviour in $La_{0.5}Sr_{0.5}CoO_{3}$ near the paramagnetic-ferromagnetic transition temperature. We have analysed our dc magnetisation data near the transition temperature with the help of modified Arrott plots, Kouvel-Fisher method. We have determined the critical temperature $T_c$ and…
This book contains all the necessary information and advice for anyone wishing to obtain electron micrographs showing the most accurate ultrastructural detail in thin sections of any type of biological specimen. The guidelines for the choice of preparative methods are based on an extensive survey of current laboratory…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLigand-Accelerated Catalysis of the Ullmann Condensation: Application to Hole Conducting TriarylaminesH. Bruce Goodbrand and Nan-Xing HuView Author Information Xerox Research Centre of Canada, 2660 Speakman Drive, Mississauga, Ontario, Canada L5K 2L1 Cite this: J. Org. Chem. 19…
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The compound Bi 1/2 Ag 1/2 TiO 3 has been synthesized, for the first time, at 14−14.5 GPa and 1000 °C using the uniaxial split sphere anvil type press (USSA-2000). The structure of the quenched powder sample was refined from synchrotron X-ray diffraction data using the Rietveld method. At room temperature, Bi 1/2 Ag 1…
The NH protons of the chlorins (17,18-dihydroporphyrins) and fully conjugated porphyrins can undergo tautomerization between the four central nitrogens. We have investigated the NH tautomerization process of bonellin dimethyl ester by NMR spectroscopy and molecular modeling. In this natural chlorin derivative, the tau…
Sulfur K-edge X-ray absorption spectroscopy (XAS) has been used to investigate the distribution of sulfur types in two whole blood cell samples, in selected subcellular blood fractions, and in cell-free plasma from the tunicate Ascidia ceratodes . Whole blood cells are rich in sulfate, aliphatic sulfonate, and low-val…
Photoisomerization of the azo component in the supramolecular hydrogen-bonded assembly between 4,4‘-azabipyridine and 4-alkyloxybenzoic acid brings about a marked increase in its crystal to liquid crystal phase transition temperature.
It was observed that the photolysis of 4‘-chlorostilbenecarboxylic acid (CSC) in N,N -dimethylformamide (DMF) yielded mainly a syn head-to-head dimer. The molecular alignment in hydrotalcite interlayers has been investigated by electric linear dichroism (ELD) at room temperature in order to clarify the correlation bet…
The new monomer 1,2- o -isopropylidene-[ d ]-xylofuranose-3,5-cyclic carbonate (IPXTC) was prepared. The organometallic catalysts AlR 3 −H 2 O (R = ethyl, isobutyl), ZnEt 2 −H 2 O, and Sn(Oct) 2 were evaluated for the copolymerization of [ l ]-lactide ([ l ]-LA) with IPXTC. This work showed that Sn(Oct) 2 was preferre…
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The reorientation transition of the magnetization of ferromagnetic films is studied on a microscopic basis within a Heisenberg spin model. Using a modified mean field formulation it is possible to calculate properties of magnetic thin films with non-integer thicknesses. This is especially important for the reorientati…
The giant transverse magnetoresistance is observed in the case of photoinduced nonequilibrium carriers in an asymmetric undoped system of three GaAs/AlGaAs quantum wells at room temperature. In a magnetic field of 75 kOe, the resistance of nanostructure being studied increases by a factor of 1.85. The magnetoresistanc…
Definitions of fundamental quantities, and their units, for ionizing radiation are given, which represent the recommendation of the International Commission on Radiation Units and Measurements (ICRU). © 2011 International Commission on Radiation Units and Measurements.
Factors that affect quantitative analysis by surface-enhanced resonance Raman scattering (SERRS) have been investigated using azobenzotriazol and reactive dyes. Preaggregation of the silver colloid was the most effective method to obtain repeatable and reproducible scattering. Aggregation by poly(l-lysine) or spermine…