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Condensed phase growth of single-wall carbon nanotubes from laser annealed nanoparticulates (2001)

Geohegan, D. B. ; Schittenhelm, H. ; Fan, X. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 78 (2001), S. 3307-3309

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Single-wall carbon nanotubes (SWNT) were grown to micron lengths by laser-annealing nanoparticulate soot containing short (∼50 nm long) nanotube "seeds." The "seeded" nanoparticulate soot was produced by restricting the time spent by an ablation plume inside an 800 °C oven following laser vaporization of a C–Ni–Co target. The soot collected from the laser vaporization apparatus was placed inside graphite crucibles under argon, and heated by a CO2 laser. In situ pyrometry was used to estimate the sample temperature. Length distributions of SWNT bundles in the unannealed and annealed samples were measured by transmission electron microscopy and field emission scanning electron microscopy. Annealing treatments exceeding 1600 °C produced no increase in nanotube length, while lower temperatures in the 1000–1300 °C range were optimal for growth. These experiments indicate that SWNT grow by the conversion of condensed phase nanomaterial during annealing, a similar mechanism to that proposed for growth during normal laser–vaporization production. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1371796

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Prognosis of extrahepatic bile-duct atresia after hepatoportoenterostomy (2000)

Schweizer, P. ; Schweizer, M. ; Schellinger, K. ; [et al.]

Springer

Pediatric surgery international 16 (2000), S. 351-355

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ISSN: 1437-9813

Keywords: Key words Extrahepatic biliary atresia ; Hepatoportoenterostomy ; Prognosis ; Long-term results

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Clinical and histologic findings from 206 patients operated upon for extrahepatic biliary atresia (EHBA) are analyzed in order to define the prognosis of patients with EHBA. The prospective study took into consideration both initial fibrosis of the liver and the morphology of the porta hepatis (PH) at surgery. Kaplan-Meier survival estimates and statistical calculations demonstrated a relationship between long-term survival and histologic findings in the liver and porta hepatis. The efficacy of HPE is significantly influenced by the morphology of the PH and to a lesser extent by the initial liver fibrosis. Surgery should thus achieve pattern 1 morphology of the PH, but this is problematic because of the close relationship of the vascular and biliary structures in its two lateral zones.