Versailles project on advanced materials and standards (VAMAS) interlaboratory study on measuring the number concentration of colloidal gold nanoparticles

Abstract

This study compared results of nanoparticle number concentration measurements collected from 74 instruments hosted across 50 laboratories, providing users with useful discussion and reference data to assess and benchmark their measurement capability.

Low Efficiency of Laser Heating of Gold Particles at the Plasmon Resonance: An X-ray Calorimetry Study

“…In ref 17, we also checked the efficiency of 53 nm PLAL particles for the macroscopic absorption cross section at known mass concentration and found a similar reduction. On the other hand, recent careful evaluation of experimental UV−vis spectra of model gold particles has confirmed the general reliability of the Mie calculations and size determination 64 at the interband transition, where our observed efficiency matches the prediction.…”

Results of an interlaboratory comparison for characterization of Pt nanoparticles using single-particle ICP-TOFMS

“…This finding is yet consistent with results from previous ILCs, where PNC values are less in line between laboratories than particle mass or size values. 8–10,52 The average values were determined to be 4.6 × 10 10 ± 2.5 × 10 10 particles per mL for the nominal 50 nm NPs, and 1.5 × 10 10 ± 7.9 × 10 9 particles per mL for the nominal 70 nm NPs, as opposed to the expected 4.6 × 10 10 particles per mL and 1.3 × 10 10 particles per mL, respectively.…”

NanoDefiner Framework and e-Tool Revisited According to the European Commission’s Nanomaterial Definition 2022/C 229/01

“…Other ISO or European Committee for Standardization (CEN) projects on the determination of the (nano)particle size distribution with methods such as small-angle X-ray scattering (SAXS) and single-particle inductively coupled plasma mass spectrometry (spICP-MS), providing guidance on the measurement of the nanoparticle concentration or of the agglomeration/aggregation state, are in progress. Similarly, there is rich activity [ 26 ] under the pre-standardisation platform of the VAMAS project ( (access 30 November 2022)). This relies mostly on the organisation of international interlaboratory comparisons and provides valuable input for the development of new ISO standards on (nano)particle size, shape, and number concentration, with further methods (such as atomic force microscopy (AFM), also correlative with SEM), or new or more complex (nano)materials, e.g., 2D materials, including sample preparation.…”