DEVELOPMENT OF THE PRIMARY NANOPARTICLE MEASUREMENT STANDARD BY THE ELECTRO-GRAVITATIONAL AEROSOL BALANCE

摘要

In order to achieve higher accuracy and lower uncertainty for nanoparticle size measurement, the electro-gravitational aerosol balance method has been used to develop the primary nanoparticle size standard system at Center for Measurement Standards, because of the simplicity of its principle. The measurements for the particle sizes ranging from 100 nm to 500 nm are currently in progress.rnBecause of the different measurement principles applied in these techniques for nanoparticle size characterizations, the obtained measurement results do not always agree with each other. In some cases, the deviation on the measurements of the same sample is rather significant that would easily lead to the questions of which instrument could be trusted when it comes to determining the sizes of certain nanoparticles and how to translate the difference in measurements among these instruments. Certainly, there are number reasons that would attribute to the disagreement in measurements.rnIt would definitely improve measurement consistency and accuracy if there exist particulate reference standards, international or industrial standards that would sufficiently comprehend details of the measurements. Additionally, measurement consistency and accuracy could be improved, if the nanoscale instruments in the laboratories can be properly evaluated with uncertainty budget, and validated with recognized protocols.