Antimicrobial Nanoparticle Surface: Bacterial Kill-Curve Simulator

This simulation models a real preventive-medicine application of nanotechnology: antimicrobial nanocoatings on high-touch hospital surfaces such as door handles and rails. Silver or ZnO nanoparticles are scattered across a coated patch, each one releasing ions or reactive oxygen species that form a concentration field falling off with distance. Bacteria wander the surface by random motility, and each one faces an instantaneous death probability set by the local concentration it is exposed to — the same first-order (Chick–Watson) disinfection kinetics used to rate real antimicrobial coatings. Switch between silver and ZnO, change the coverage density and bacterial load, and watch the population decay curve turn into the characteristic straight line of exponential die-off on the log-scale chart.