Filter polycrystalline

Fig. 13 87Rb NMR spectra of polycrystalline RbN03 (a) sheared z-filter 2D triple-quantum MQMAS spectrum, (b) MAS spectrum, (c) MQMAS isotropic projection, and (d-f) cross-sections of the 2D spectmm showing the three different crystallographic sites...

Chelates 589 (3.27) and 590 (3.28) [16] were obtained by refluxing the methanol (or ethanol in the case of 590) solutions of corresponding ligands and metal acetate in a 2 1 ratio for 15 min. Polycrystalline precipitates were filtered out, washed by corresponding solvent, and dried in vacuo at 150°C. Yields 40-50%. 

The preparation of the supported catalytic Fe-clusters have been recently reported by our laboratory for Fe/Nafion membranes [1,2,3] for Fe/Nafion/glass-mats [4,5] micro-encapsulated Fe-alginate beads [6] Fe-amorphous polycrystalline thin film fused copolymers [7] and finally Fe/silica woven fabrics [8]. Experiments were conducted with Nafion perfluorinated cation transfer membrane. Photolysis experiments were carried out by means of a Hanau Suntest Lamp with tunable light intensity equipped with an IR filter to remove infrared radiation. Light... 

X-ray diffraction (XRD) and magnetic susceptibility measurements were carried out on polycrystalline materials that had been calcined in oxygen. XRD powder patterns were recorded with Cu Ka radiation using a Ni filter on a Rigaku diffractometer. For reference all patterns were recorded with an internal NBS Si standard. After correcting the peak position based on the observed silicon line positions, the lattice constants were then refined by a least squares method weighted proportional to the square root of the height and inversely with the square of the width of the peak. 

The interference-filters and CdS-filters described above could in principle be straightforwardly integrated with glass microfluidic chips, but they are unsuitable for conformable elastomeric materials such as PDMS - a preferred substrate material for low-cost disposable applications - since polycrystalline materials such as CdS, Ti02, and Si02 are t3T3ically deposited at relatively high temperatures (>300°C) and have a tendency to crack when the substrate is flexed. 

Commercial polycrystalline oxide fibers are produced by spinning and hydrolyzing precursors. First a fiber precursor solution is filtered and concentrated to remove excess solvent, forming a viscous spin dope. Then, continuous filaments are extruded by spinning. The filaments are pyrolyzed to remove volatile components and then heat treated above 800X (1,472°F) to crystallize and sinter the fiber. Polycrystalline oxide fibers are produced in tows of200 to 1,000 fibers with diameters of 10 to 16 pm (0.39 to 0.63 mils). Typical ranges of properties are listed in Table ES-1. 

Characteristic X-rays are usually used in diffraction experiments where the sample has many different crystal orientations, such as in a polycrystalline or powder sample, as well as for single crystal structme determination. The Ka characteristic line is preferred for use in such experiments since it has the highest intensity. To filter the output of an X-ray tube with the purpose of selecting the prominent line of the target X-ray of the tube, the filter is... 

Mossbauer spectroscopy is ideally suited to follow the light-induced spin state conversion in [Fe(ptz)6]BF4)2 as exemplified in Fig. 2.18. A polycrystalline sample of [Fe(ptz)6](BF4)2 was cooled to 15 K. Before irradiation, the sample is in the LS state and shows the typical Mossbauer spectrum of Fe°-LS (upper left). After irradiating with green light (Xe lamp with filters or 514 nm band of an Ar ion laser) at 15 K the sample is quantitatively converted to the metastable HS state (middle left). The asymmetry in the intensity of the two components of the... 

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