2015-05-042015-05-042005-06-21Halas, Nancy J. and Bradley, Robert K., "Method for scalable production of nanoshells using salt assisted purification of intermediate colloid-seeded nanoparticles." Patent US6908496B2. issued 2005-06-21. Retrieved from https://hdl.handle.net/1911/79889.https://hdl.handle.net/1911/79889A method for purifying a suspension containing colloid-seeded nanoparticles and excess colloids is provided that includes adding to the suspension a filter aid comprising a salt. The method further includes filtering the suspension with a filter of a pore size intermediate between the average colloid-seeded nanoparticle size and the average excess colloid size, so as to form a retentate that includes the majority of the colloid-seeded nanoparticles and a filtrate that includes the majority of the excess colloids. Still further, the method includes collecting the retentate. The method may be incorporated into a method of making metallized nanoparticles, such as nanoshells, by reduction of metal ions onto the purified colloid-seed nanoparticles so as to form the metallized nanoparticles.14 ppengUtility patentUS6908496B2