Proc Natl Acad Sci U S A.  2010 Sep 21; 107(38): 16428–16431. |  David W. Keith1 Photophoretic levitation of engineered aerosols for geoengineering The use of electrostatic or magnetic materials enables a class of photophoretic forces not found in nature. … Continue reading Photophoretic levitation of engineered aerosols for geoengineering