Lilian Grigorian

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We report atomic resolution Z-contrast scanning transmission electron microscopy images that reveal the incorporation of I atoms in the form of helical chains inside single-walled carbon nanotubes. Density functional calculations and topological considerations provide a consistent interpretation of the experimental data. Charge transfer between the nanotube(More)
Resonance Raman scattering is used to determine the radial breathing mode ͑RBM͒ frequency ͑␻ RBM ͒ dependence on tube diameter ͑d t ͒ for single-wall carbon nanotubes ͑SWNTs͒. We establish experimentally the ␻ RBM = 227.0/ d t as the fundamental relation for pristine SWNTs. All the other RBM values found in the literature can be explained by an upshift in(More)
We report intercalation of charged polyiodide chains into the interstitial channels in a single-wall carbon nanotube (SWNT) rope lattice, suggesting a new carbon chemistry for nanotubes, distinctly different from that of graphite and C 60. This structural model is supported by results from Raman spectroscopy, x-ray diffraction, Z-contrast electron(More)
The aim of this study is to analyze MMP-2 and sTNF-R1 variability, potent predictors of cardiovascular events, in stable hypertensive patients during a 12-month followup. 234 asymptomatic patients (age 60 ± 13, 136 male) out of 252 patients with essential hypertension were followed up. MMP-2 and sTNF-R1 were measured at baseline and after 12 months (stage(More)
The electrical transport properties of single-wall carbon nanotubes are shown to be strongly influenced by the presence of transition-metal impurities derived from the catalyst introduced to stimulate their growth. Data on thermoelectric power and electrical resistance in the temperature range 10–400 K were obtained on a series of samples prepared using MY(More)
Ž. We demonstrate that single-wall carbon nanotubes SWNT can be produced by an arc-discharge method using a catalyzed coal carbon source. Characterization by resonant Raman scattering and electron microscopy confirm that this material contains SWNT with properties similar to graphite-derived SWNT. 'Web-like' material from our growth process has an estimated(More)
We report in situ measurements of four-probe dc resistance ͑R͒ and thermopower ͑S͒ of Cs-and K-doped single-wall carbon nanotube ͑SWNT͒ mats as a function of a doping and temperature ͑T͒. With increasing dopant exposure, the mat resistance has been found to first decrease and then increase, exhibiting a minimum for optimal Cs doping. In contrast, for K(More)
B-type natriuretic peptide (BNP) and its inactive amino-terminal fragment (NT-proBNP) are diagnostic tools for heart failure (HF), but less is understood regarding the effects of renal function on their urinary concentrations. The objective was to analyze the influence of renal function, as estimated glomerular filtration rate (eGFR), on BNP and NT-proBNP(More)
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