The Micromeritics ASAP 2010 (Accelerated Surface Area and Porosimetry System) provides high quality surface area (BET) and porosity measurement on different types of solid materials based on the gas adsorption theory. Carbon nanotubes and catalysts are characterized using this technique. The Micromeritics ASAP 2010 system consists of an analyzer equipped with two sample preparation ports and one analysis port, a control module, and an interface controller which helps the operation to be controlled easily and accurately. In addition, the Micromeritics ASAP 2010´s software allow us to perform automatic analysis and collect a variety of analysis reports.
The role of water in carbon feed on the surface-guided growth of horizontally aligned single-walled carbon
nanotubes (HA-SWCNTs) was investigated. It is shown that the amount of water can be optimized to favor HA-SWCNT growth, which is proposed to be due to selective etching of carbon deposits at carbon–metal interface. Without water, nanotube–nanotube interaction and carbon accumulation at the interface are disproportionately large compared to the rate of nanotube growth, leading to catalyst deactivation. With excess water, suppression of nanotube growth occurs, resulting in reduced carbon yield on the surface.
Intermediate carbon/water feed ratios achieve cleaner growth with high efficiency.