The roots of nanotechnology can be traced back to colloid science in the mid-19th century. Francesco Selmi, often credited with the first true research in the field, studied the behavior of various metallic and acidic emulsions in the 1840s (1). Shortly thereafter, Michael Faraday and Thomas Graham, two scientific pioneers known primarily for their work with electricity and diffusion of gases, respectively, contributed further to the analysis of nanoparticulate suspensions, i.e., colloids. Faraday’s studies in electrochemistry naturally led him to the first experiments with colloidal gold(2), and Graham coined the term “colloid” after noting …