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TWA 34

Nanoparticle Populations

Activities in this TWA will advance the measurement of nano-particles (NP) populations such as metal nano-wires, single-walled carbon nanotubes, magnetic nano-particles, nanopowders and quantum dots. The focus of the TWA is standardization and cross-comparison of measurement techniques for determining the defining dimensional, electronic, chemical, optical or magnetic characteristics of the nano-particles.

Projects within the TWA may be defined for single classes of dispersed nano-particles. Activities have been initiated with a project on refining the measurement of chirality distribution in polydisperse single-walled carbon nanotube samples. Other characterizations of polydisperse nanoparticle populations, such as the measurement of titanium dioxide nano-powders, magnetic nanoparticles, or general measurements of particle size and dispersion state are also considered to be within the bounds of this TWA.

Completed Projects

• PROJECT 1: Single-Wall Carbon Nanotube (SWCNT) Chiral Vector Distribution Determination [Complete]

• PROJECT 2: Titanium Dioxide (TiO₂) Nanopowder Surface Area Measurement

• PROJECT 3: Techniques for Characterizing Morphology of Airborne Nanoparticles

• PROJECT 4: Raman spectroscopy of fullerene nanofibers

• PROJECT 5: Method validation for determination of average aspect ratio of gold nanorods (GNRs) using UV-visible-NIR absorption spectrometry

• PROJECT 6: Primary particle size distribution measurements using transmission electron microscopy

• PROJECT 7:Requirements for describing materials on the nanoscale

• PROJECT 8:Determination of total sulfur and sulfate half ester content in cellulose nanocrystals

• PROJECT 9:Assessment of a quantitative nanomaterial definition

• PROJECT 10:Measurement of number concentration of colloidal nanoparticles

• PROJECT 11:Static Muliple Light Scattering (SMLS) - mean particle size evaluation

• PROJECT 12:Determination of particle size distribution for cellulose nanocrystals (CNCs)

Active Projects

• PROJECT 13:Analysis of nano-objects using field flow fractionation

• PROJECT 14:Crystallinity of cellulose nanomaterials by Powder X-ray Diffraction and Rietveld Modelling

• PROJECT 15:Measurement of particle size and shape distribution of bipyramidal titania including deposition from liquid suspension

• PROJECT 16:Measurement of (relative) number concentration of bimodal silica nanoparticles including deposition from liquid suspension

• PROJECT 17:Line notation and unique identifiers for nanomaterials and groups of nanomaterials

More information

Dr. Jeffrey Fagan  (Chair)    jeffrey.fagan@nist.gov   +1 301 975 6740