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SUMMARY:Colloidal Synthesis of Metal Nanoparticles: Identifying the Role(s)
  of Ligands in Controlling the Size Distribution
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20199001T000000
UID:2026-05-03-13-40-45@natsci.colostate.edu
DTSTAMP:20260503T134045
Description:About the Seminar:\nNanoparticles are becoming the enabling bui
 lding blocks of materials for many applications including fuel cells\, bio
 sensors\, batteries\, photovoltaics\, and catalysts. The nanoparticles’ 
 size/shape and their distributions are often key to their specific\, desir
 ed properties. Colloidal synthesis is one of the most tunable methods (usi
 ng a variety of ligands and reaction conditions) to control the nanopartic
 le size and shape. However\, a priori design of nanoparticles of desired s
 izes and shapes remains a grand challenge and a trial-and-error approach i
 s still often employed. Therefore\, understanding how ligands affect nucle
 ation and growth is crucial in controlling the nanoparticles size\, shape 
 and their distributions. In this seminar\, I will present my group’s rec
 ent efforts on integration of thermodynamics\, kinetic modeling and advanc
 ed in situ characterization measurements to develop a methodology for enab
 ling a priori design of metal colloidal nanoparticles with specific sizes.
 \nThe first part of the seminar will cover the importance of using multipl
 e in-situ experimental observables to extract the nucleation and growth ra
 tes and determine how ligands directly and indirectly affect them for a mo
 del Pd system. Using the in-situ measured rates\, a kinetic model was deve
 loped\, and the accurate predictions of both size evolution and final size
  under different conditions will be presented. In the second part of the t
 alk\, the effect of metal-ligand binding thermodynamics on the nucleation 
 and growth kinetics\, and evolution of size distribution will be presented
 . We show that the metal precursor-ligand and nanoparticle-ligand binding 
 energies are correlated with the nucleation and growth rates\, respectivel
 y. Lastly\, building on those findings\, I will describe a new modeling ap
 proach for predicting the evolution of nanoparticle size distribution and 
 designing mono-disperse nanoparticles.\nAbout the Speaker\nDr. Karim joine
 d the Department of Chemical Engineering at Virginia Tech as an Associate 
 Professor in the Fall of 2014. His research is focused on the synthesis an
 d characterization of nanomaterials\, and the design of heterogeneous cata
 lysts for energy and environmental applications. He is a co-principal inve
 stigator for the Synchrotron Catalysis Consortium (SCC) and his group uses
  a combination of advanced in-situ and in-operando characterization techni
 ques (SAXS\, XAFS\, FTIR) to study the synthesis mechanisms of colloidal n
 anoparticles and catalysts and to study the reaction mechanisms on heterog
 eneous catalysts. He recently received the 3M Non-Tenured Faculty Award\, 
 Virginia Tech Institute for Critical Technology and Applied Science (ICTAS
 ) Junior Faculty Award and is a member of the Young Editorial board for Jo
 urnal of Energy Chemistry. He has co-authored 50 peer reviewed publication
 s\, one patent and delivered over 20 invited lectures and presentations. P
 rior to Virginia Tech\, he worked as a senior research scientist (2008-201
 4) at the Pacific Northwest National Laboratory (PNNL)\, one among 10 U.S.
  Department of Energy (DOE) national laboratories managed by DOE\\'s Offic
 e of Science. Dr. Karim earned his BSc in Biomedical Engineering from Cair
 o University in Egypt (2000) then moved to the U.S. and received his PhD i
 n Chemical Engineering from the University of New Mexico working with Prof
 . Abhaya Datye (2001-2006) followed by a postdoctoral fellowship at the Un
 iversity of Delaware in the Chemical Engineering Department with Prof. Dio
 nisios Vlachos (2007-2008). 4:00 pm
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