Single Wall Carbon Nanotubes (SWCNT)

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

no guideline available

Principles of method if other than guideline:

Raman spectroscopy was carried out on a single wall carbon nanotube (SWCNT) sample (Lot #73-27052015) to measure the G/D band intensity ratio and the radial breathing mode (RBM) distribution. The G/D ratio correlates with the amount of ordered sp2 carbon in the system and is an indicator of tube quality; the presence of defects in the hexagonal lattice reduces the G/D ratio. The RBM frequencies are inversely proportional to the diameter of the SWCNTs and provide information on the range of tube diameters present in the sample.

GLP compliance:

no

Type of method:

other: Raman spectroscopy

Type of particle tested:

primary particle

Mass median aerodynamic diameter:

ca. 1.6 nm

Geometric standard deviation:

ca. 0.6

Key result

Percentile:

other: D80

Mean:

1 - 2.2 nm

St. dev.:

0.6

Remarks on result:

other:

Remarks:

highest intensities near 1.6 nm

Conclusions:

The Radial Breathing Mode distribution revealed a spread in tube diameters between 1.0 nm and 2.2 nm with highest intensities near 1.6 nm.

Description of key information

The Radial Breathing Mode distribution revealed a spread in tube diameters between 1.0 nm and 2.2 nm with highest intensities near 1.6 nm.