Dear colleagues,
I am following a synthesis protocol for chitosan-functionalized silver nanomaterials where the pH is adjusted using ammonia water and HNO3 to achieve pH 5.0 for spherical particles. However, the concentration of HNO3 used for pH adjustment is not specified in the methodology.
Could anyone with experience in similar silver nanoparticle synthesis advise what concentration of HNO3 is typically used for pH adjustment in these systems?
Any guidance or relevant references would be greatly appreciated.
based on this article: Synthesis, characterization and antibacterial study on the chitosan-functionalized Ag nanoparticles
As a start, use the same molarity as the ammonia solution you're using. Dropwise and monitor with a pH meter. Too high a concentration of HNO3 will dissolve the silver nanoparticles.
Use dilute nitric acid around 0.1 M for pH adjustment to 5.0 in chitosan-silver nanoparticle synthesis, adding it slowly after ammonia treatment. This helps maintain nanoparticle stability and achieve spherical particles.
- Badges
- Science topic