Carbon Nanotube | Dispersion | Evaluation of Dispersion
Evaluation of Dispersion
The laser diffraction particle size analyzer measures the sizes and proportion of carbon nanotubes (CNTs) contained in a sample. Realtime measurements allow observations of CNT aggregation status and changes.
The laser diffraction and scattering method determines the particle size distribution from the intensity distribution of light scattered from the particles. Shorter-wavelength light is required to observe the smaller particles. The SALD-7100 used for these measurements offers a shorter-wavelength laser than the conventional 680 nm laser. This 405 nm laser achieves a lower limit of detection of 15 nm.
The diagrams below show time-sequence measurements of CNTs dispersed in a solvent. The CNTs gradually aggregate, resulting in larger particle sizes.
SALD-7100 Nano Particle Size Analyzer
Performs consecutive measurements at one-second intervals of particle sizes between 10 nm and 300 µm and of changes in the particle size distribution. Unique options are available to measure high-concentration samples (20 wt% max.) and ultramicro samples (15 µL min.). It offers leading-edge measurements in new areas including nanotechnology, life sciences, and nanobubbles.
The IG-1000 exploits dielectrophoresis instead of scattered light. Numerous particles form a diffraction grating and the particle sizes are measured from the rate of dispersion and decay of the diffraction grating. Adequate signals are obtained even in the single nano region to achieve highly sensitive measurements with excellent repeatability.