KONA Powder and Particle Journal No. 36 (2019) 296/Doi:10.14356/kona.2019022

Infomation Article

The 25th KONA AwardSotiris E. Pratsinis is professor of process engineering and materials science at the Swiss Federal Institute ofTechnology (ETH Zurich) since 1998. There he teaches Mass Transfer, Introduction to Nanoscale Engineering andMicro-Nano-Particle Technology. He received his Diploma in Chemical Engineering from Aristotle Univ. ofThessaloniki, Greece in 1977. He served in the Greek Navy and worked in a textile company before receiving hisMSc (1982) and PhD from University of California, Los Angeles in 1985. He was in the faculty of the Univ. ofCincinnati, USA from 1985 to 2000. He has graduated 40 PhD students, now at leading positions in industry andacademia, worldwide. He has published 400+ refereed journal articles and has been awarded 20+ patents that arelicensed to industry and have contributed to the creation of four spinoffs.
His research focuses on multiscale particle dynamics & aerosol reactor design. He has pioneered flame synthesisof nanostructured materials with closely controlled characteristics. This scalable process is practiced today in industrial units and academic labs. For example, in April 2017 the German National Science Foundation launched a6-year, 6M Euro program funding about 20 PhDs in German universities on the fundamentals of flame spray pyrolysis (FSP) that was developed in his laboratories back in 2002. Also Harvard’s School of Public Health is using
extensively his FSP for synthesis of nanomaterials of various sizes and compositions to benchmark their toxicity
under $5M funding by the U.S. National Institute of Health since 2016.
He first measured the oxidation rate of TiCl4 for synthesis of TiO2 that has been recognized as “… a landmark
contribution to … (pigment) industry…”. He has led the development of innovative algorithms for agglomerate
formation and growth by 2-dimensional (mass and surface area) population balances for reaction, coagulation andsintering. These models along with his proof of the rapid attainment of both self-preserving size distribution andfractal-like structure during aerosol synthesis of materials enabled him to create simple, reliable, unimodal andeven monodisperse particle dynamics models. These are interfaced readily with fluid mechanics greatly facilitatingprocess design for particle manufacture and processing. For example, his model for production of optical fiber preforms was the first of its kind and it is still used in industry.
Motivated by this quantitative understanding, he showed experimentally, how to control flame-made particle
size, crystallinity and, for the first time, morphology: from perfectly spherical particles to highly ramified agglomerates. Most notably, he developed the above FSP process for synthesis of sophisticate particle compositions, up to
5 kg/h in his labs, perhaps world’s largest such facility for manufacture of nanoparticles at an academic institution.
With FSP he prepared novel heterogeneous catalysts (primarily for environmental remediation) and gas sensors(primarily for breath analysis) and, for the first time, flame-made nutritional supplements, dental and theranostic
materials. Also his FSP contributed decisively to environmental policy by identifying the origins of nanosilver
toxicity and even developing processes for “curing” it.
His program has been funded by both Swiss and U.S.
National Science Foundations, European Union as well as
by DuPont, Dow, Degussa, Toyota, Nestle, Siemens, Millennium, Bühler, Clariant & others. His research has beenrecognized by the 1988 Kenneth T. Whitby Award of theAmerican Association of Aerosol Research, a 1989 Presidential Young Investigator Award from the U.S. NationalScience Foundation, a 1995 Smoluchowski Award by
Gesellschaft für Aerosolforschung, the 2003 Thomas
Baron Award by the American Institute of Chemical Engineers (AIChE). In 2009 he won an Advanced Investigator Grant from the European Research Council, in2011 a Humboldt Research Award (Germany) and in 2018both a Fuchs Memorial Award from the International
Aerosol Research Assembly and the Lifetime Achievement Award in Particle Technology from AIChE. He is
Mr. Y. Hosokawa (Left), the president of Hosokawa
member of the Swiss Academy of Engineering since 2012.
Foundation and Prof. Pratsinis, the KONA Awardee296