Nanotechnology startup has closed on $2.5 million in new financing as part of a projected $6 million round, according to a filing with the Securities and Exchange Commission.

Among the investors are German billionaire Eugen Viehof and Clay Dunnagan, managing partner at Anchor Capital Management Company in Raleigh, according to the Triangle Busines Journal.

LaamScience last closed on $2.6 million in financing in 2007.

The company is commercializing a light-activated antimicrobial coating technology discovered at North Carolina State and Emory University that can be used to kill bacteria and halt viruses. Its technology is being used to coat personal respirators. The firm also wants to develop coatings for air filtration systems used in airplanes, homes, buildings and automobiles.

LaamScience is seeking Food and Drug Administration approval for surgical masks that are designed to kill bacteria. Other products are under development.