Interesting. I recently watched a video of researchers from the University of Nottingham, who have developed a method of producing metal nanoparticles using supercritical water in a setup that can produce them continuously, rather than in batches. If they can adapt that kind of technology to these specific type of particles, the process could be streamlined.
http://www.youtube.com/watch?v=6zurHSq4CB4&feature=results_video&playnext=1&list=PL32CC4F98E910EE75
Good info. Supercritical reaction systems are making possible MANY previously difficult (or even impossible) chemistries/processes to become practical.