Poly sample, well-crystallized

Typical XRD patterns (Fig2) show that nanowires are relatively well crystallized. Samples are poly-phasic and the pattern is indexed as a mixture of the hexagonal close packed (hep) lattice (69%) and the face centered cubic structure (fee) (31%) as determined by Match software. The presence of a small percentage of CoO phase is visible in some of our spectra. This latter is a well-known phenomenon of surface oxidation in metal nanowires [14]. 

Distinct quadrupole shifts do occur as well in magnetically split spectra of single-crystals, poly crystalline powder or frozen solution samples. In all three cases, the line shifts obey the simple first-order expression at high-field condition. 

EPMA is a well established technique of analysis for determining chemical composition of metallurgical samples. The accuracy of this technique is very high with reliable results at the 0.01 % level (high PPM range) and is element dependant. Five elements were examined Ag, Pb, Cu, Fe, and Au. All standards were metallic with an average taken over 6 analyses. The crystal used for Ag, Pb, and Au was PET (Poly-Ethylene Terephthalate) and the crystal used for Fe and Cu was LiF. The EPMA used was a JEOL 733 electron microprobe which is... 

Seguela and Prud homme (1989) investigated a PE-PEP-PE triblock copolymer containing 27wt% poly(ethylene) cast from a neutral solvent close to the Tm of PE and well below it. The samples cast above Tm crystallized within the assumed hexagonal-packed cylinder microphase-separated structure. However, SAXS experiments performed on the samples cast at room temperature suggested that crystallization occurred without prior microphase separation in the melt. This path dependence is a general feature of crystallization in block copolymers. 

Ultrasonic interferometry, in which the travel time of high-frequency elastic waves through a sample is measured, also yields elastic moduli. Because it is a physical property measurement, rather than an optical spectroscopy, it can be used equally well on poly-crystalline samples as single-crystals, although polycrystalline measurements only yield the bulk elastic properties, bulk modulus and shear modulus, G. High-pressure ultrasonic interferometry techniques were initially developed in the piston cylinder... 

X-ray diffraction analysis showed that poly(ethylene 2,6-naphthalate) (PEN) film, annealed from 160 to 260 C crystallised in the alpha-crystal form, whilst crystallisation directly from the melt yielded the beta-crystal form when the crystallisation temperature (Tc) was greater than 200 C, and in the alpha form at lower Tc. Infrared spectra from PEN samples containing alpha, beta, and amorphous phases were determined, and the amorphous contribution digitally subtracted to yield characteristic spectra of the amorphous, alpha, and beta phases. It is proposed that the alpha crystal form adopts an all-trans conformation, whilst the beta crystal form adopts a conformation with appreciable gauche character. Conformational changes in PEN occurred due to the rotation of the naphthalene ring as well as rotation of the ethylene glycol units. The... 

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