The newly-invented method, named the matrix assembly cluster source (MACS), involves no solvent and is a step change in the approach to water treatment and other catalytic processes. Cai et al demonstrate the catalytic activity of Ag and Au clusters physically deposited onto titanium dioxide (TiO2) powders with the MACS in the catalytic ozonation of nitrophenol; compared to traditional catalysts reported in the literature, the catalysts produced by...