tailieunhanh - Carbon Nanotubes – A scientometric study_1

In contrast to our previous study (Barth & Marx, 2008) dealing with a currently decreasing research field (high-temperature superconductors) we analyzed here a topic which has raised a strongly increasing interest among researchers: research activities around carbon nanotubes (CNTs or NTs). Carbon nanotubes (often named only nanotubes) are graphite sheets rolled up into cylinders with diameters of the order of a few nanometers and up to some millimeters in length with at least one end capped with a hemisphere of the fullerene structure | 1 Carbon Nanotubes - A scientometric study Werner Marx and Andreas Barth Max Planck Institute for Solid State Research D-70569 Stuttgart Germany FIZ Karlsruhe D-76344 Eggenstein-Leopoldshafen Germany 1. Introduction In contrast to our previous study Barth Marx 2008 dealing with a currently decreasing research field high-temperature superconductors we analyzed here a topic which has raised a strongly increasing interest among researchers research activities around carbon nanotubes CNTs or NTs . Carbon nanotubes often named only nanotubes are graphite sheets rolled up into cylinders with diameters of the order of a few nanometers and up to some millimeters in length with at least one end capped with a hemisphere of the fullerene structure. There are two main types of nanotubes the single-walled nanotubes SWCNTs or SWNTs and the multi-walled nanotubes MWCNTs or MWNTs in particular the doublewalled nanotubes DWCNTs or DWNTs . MWCNTs consist of a single sheet of graphite rolled in around itself like a rolled up newspaper or consist of multiple layers of graphite arranged in concentric cylinders like a Russian Doll . Nanotubes exhibit some remarkable properties They feature extraordinary strength show efficient conductivity of heat and unique electrical properties metallic conductivity and semiconductivity . These properties make them potentially useful in a wide range of applications like in materials science electronics and nanotechnology. The one-atom thick single graphite layers building up the nanotube cylinders are named graphene the newest member of this structural family. This species was presumed not to exist in the free state before it was discovered in the year 2004. The large number of articles with respect to nanotubes has brought about that scientists being active in this research field have increasingly problems to overview their discipline. On the other hand modern information systems offer databases and analysis tools providing remedy. However due to .

• Hoá dầu
• technology petrochemical
• oil refining processes
• petrochemical organic
• petrochemical
• Nanomaterials
• polymetallic deposition
• compressor oil
• geological survey standards
• curriculum oil
• lubrication technology
• Oil and Lubricants
• gas dehydration
• oil and gas transport
• geological drilling
• oil lubrication
• Electroanalytical Chemistry
• ohmic Potential