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SUMMARY:Hypothesis driven control of phase in colloidal synthesis
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20260220T160000
UID:2026-04-23-12-23-26@natsci.colostate.edu
DTSTAMP:20260423T122326
Description:Seminar Abstract:\n\nLong chain ligands have long been used to 
 control size and shape of nanocrystals by binding to growing surfaces\, bu
 t we have discovered rich molecular chemistries with the precursors that c
 ompletely change the fate of the reaction.  To discover the fundamental r
 ules behind phase control\, it is important therefore to identify reaction
 s that can isolate the effects of reaction kinetics from changing mechanis
 tic routes. Substituted thioureas were reacted with iron\, cobalt and nick
 el and copper salts. By mapping out the effects of precursor reactivity an
 d temperature on the phase of the sulfides\, hypotheses can be developed a
 bout the predictable paths that occur between phases based on their anion 
 stacking and hole filling patterns. We discovered that the synthetic behav
 ior of the iron\, cobalt and nickel sulfides can mostly be predicted by th
 e anion stacking of hcp or ccp. Based on these maps\, we developed hypothe
 sis driven syntheses to pyrrhotite (Fe1-xS)\, mackinawite (Fe1+xS)\, smyth
 ite (Fe3+xS4)\, greigite (Fe3S4)\, marcasite (FeS2)\, pyrite (FeS2)\, jaip
 urite (CoS)\, cobalt pentlandite (Co8S9)\, linnaeite (Co3S4)\, cattierite 
 (CoS2)\, a- NiS\, millerite (NiS)\, godlevskite (Ni9S8)\, heazlewoodite (N
 i3S2)\, polydymite (Ni3S4)\, vaesite (NiS2).\n\nSpeaker Bio:\n\nJanet Macd
 onald is an Associate Professor of Chemistry at Vanderbilt University\, wh
 ere she has been since 2011. Before that time\, she did her graduate work 
 at the University of Alberta under the supervision of Jon Veinot and a pos
 t-doctoral fellowship with Uri Banin at the Hebrew University of Jerusalem
 . Her group primarily focuses on how crystalline phase is determined in co
 lloidal nanocrystal synthesis. Her group regularly collaborates with physi
 cists and physical chemists to examines fundamental charge transfer proces
 ses from quantum dots\, and plasmon-plasmon coupled harmonic light generat
 ion using combinations of metal and plasmonic semiconducting nanoparticles
 . Dr. Macdonald is an Associate Editor for Nanoscale and Nanoscale Advance
 s. 4:00 pm
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