BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VTIMEZONE
TZID:Europe/Vienna
BEGIN:DAYLIGHT
DTSTART:20190331T030000
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3
TZNAME:CEST
END:DAYLIGHT
BEGIN:STANDARD
DTSTART:20191027T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:CET
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20260405T192626Z
UID:5d0885c38304a726450145@ist.ac.at
DTSTART:20190626T100000
DTEND:20190626T110000
DESCRIPTION:Speaker: Daniel M. Balazs\nhosted by Maria Ibáñez\nAbstract: 
 Bottom-up created macroscopic materials with designer properties have been
  and will remain in the focus of researchers for energy applications for t
 heir prospects in overcoming efficiency\, cost or durability limits set by
  conventional bulk and simpler soft materials. Controlling the properties 
 of solids is mostly realized through adjusting the chemical composition an
 d/or creating favorable structural features. In conventional solids\, mixi
 ng two or more materials can either lead to homogeneous atomic mixing\, or
  multiple phases mixed at larger length-scales with uncontrollable distrib
 ution. Bottom-up fabricated solids based on colloidal quantum dots (CQDs) 
 fill the gap between the two regimes: structures with long-range nanoscale
  periodicity and controlled composition can be achieved. Moreover\, the sm
 all (few nm) size leads to significant faceting\, setting the interaction 
 dependent on the individual CQD orientation\, and creating coexisting sing
 le crystal-like atomic and a superlattice structures. Exploiting it one co
 uld create extended\, periodic arrays with multilevel ordering\, and contr
 ol the geometry of the superlattice by the particle shape\, surface and as
 sembly conditions. In the first part of the talk\, I discuss the considera
 tions for the formation of CQD superlattices. Understanding the physicoche
 mical phenomena that take place during assembly is of importance for devel
 oping highly ordered materials over macroscopic length scales. Using grazi
 ng incidence small angle X-ray scattering (GISAXS)\, the fluid and particl
 e dynamics which lead to the final structures can be tracked\, bringing us
  one step closer to the ideal ordered\, homogeneous arrays. In the second 
 part of the talk\, I give an overview how the macroscopic optical and elec
 tronic properties of CQD assemblies can be fine-tuned by exploiting the pr
 esence of quantum confinement and the large surface-to-volume ratio\, all 
 by simple\, chemical methods. The overall effect is always a combination o
 f doping\, electronic coupling or electronic structure engineering\, which
  can be studied and distinguished using a combination of techniques\, cont
 ributing to the understanding of chemistry at the nanoscale.
LOCATION:Heinzel Seminar Room / Office Bldg West (I21.EG.101)\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Daniel M. Balazs: Colloidal quantum dot superlattices: physical che
 mistry\, solid state physics and applied properties
URL:https://talks-calendar.ista.ac.at/events/2015
END:VEVENT
END:VCALENDAR