The intrinsic instability of silver nanoparticles (AgNPs) is a substantial challenge to achieving stable long-term storage for on-demand use of AgNPs. Here, a Just Add Water approach is presented for achieving suspensions of principally singly dispersed AgNPs. By lyophilizing (freeze-drying) the formulated AgNPs into a solid powder, or cake, water is removed thereby eliminating solution-based chemical changes such as oxidative dissolution. Storing under inert gas should further reduce surface reactions. An example of an optimized lyophilization formulation is presented for 75 nm AgNPs. This Just Add Water approach enables ease of use for the researcher desiring on-demand singly dispersed AgNP suspensions from a single master batch. Implementation of this methodology will enable studies to be performed over long periods of time and across different laboratories using particles that are identical chemically and physically and available on-demand, and serve as prototypes for future nanoscale reference materials.
Conference Dates: May 12-16, 2013
Conference Location: Washington, DC
Conference Title: NSTI Nanotech 2013
Pub Type: Conferences
silver nanoparticles, freeze drying