Scientists have now invented an efficient way to coat cotton cloth with tiny particles of titanium dioxide to prevent them from wearing out. The researchers, Walid Daoud and John Xin from the Hong Kong Polytechnic University, Kowloon, used the catalysts that help to break down carbon-based molecules, and require only sunlight to trigger the reaction, reports Nature. The inventors believe that these fabrics could be made into self-cleaning clothes that tackle dirt, environmental pollutants and harmful microorganisms.