Golden balls by molecular level painting
10. June 2005, Quelle: Universität Duisburg
Superparamagnetic colloids with independently controllable magnetic and optical properties have been made by researchers from Universities in Germany and Spain. Marina Spasova from the University of Duisburg-Essen, describes their technique as ‘…decorating optically active colloids with a magnetic moment..’’(Journal of Materials Chemistry, April 2005). The magnetic moment gives a simple mechanism for self-assembly of the spherical colloid particles by applying an external magnetic field. The materials formed make ideal candidates for photonic band gap materials (ie materials that exclude the passage of photons in a certain wavelength band just as semiconductors exclude the movement of electrons in a certain energy band).