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SUMMARY:Soft matter quasicrystals: when can they exist and when will we ob
 serve them? - Dr Priya Subramanian\, Mathematical Institute\, University o
 f Oxford
DTSTART:20201007T180000Z
DTEND:20201007T193000Z
UID:TALK152287@talks.cam.ac.uk
CONTACT:96343
DESCRIPTION:Regular patterns (made of tiles) and crystals (made of either 
 atoms/molecules) surround us in everyday life. These patterns look the sam
 e when moved by one unit (translational symmetry) or rotated by certain sp
 ecial angles (rotational symmetry). Such repeating arrangements are preval
 ent in nature as lesser amount of energy is required to assemble them. Ape
 riodic patterns or quasicrystals are special as they possess long range or
 der without translational symmetry. Quasicrystals have recently been obser
 ved in a variety of systems such as nanoparticles\, metallic alloys and po
 lymer solutions. Considering the difference in scale between metallic and 
 polymeric quasicrystals\, there is a need for mathematical models which ex
 plore unifying mechanisms. We begin by exploring phase field crystal model
 s to identify the ingredients that allow for the formation of soft matter 
 quasicrystals. We then go on to a more realistic density functional theore
 tic model\, where we identify features in the particle pair interaction po
 tentials which can suppress or encourage density modes with wavenumbers as
 sociated with one of the regular crystalline orderings that compete with q
 uasicrystals\, enabling either the enhancement or suppression of quasicrys
 tals.\n\nAbout the speaker: Dr Priya Subramanian is a Hooke Research Fello
 w at the Mathematical Institute\, University of Oxford and a Visiting Rese
 arch Fellow at the Leeds School of Mathematics. In 2017\, she was awarded 
 L’Oréal-UNESCO For Women In Science UK Fellowship as PI. Her research i
 nterests lie in understanding mechanisms that govern spatio-temporal patte
 rns and emergent behaviours in systems such as thermacoustic systems\, and
  transistional (convective/shear) flows of fluids. Her area of expertise a
 lso includes the fields of nonlinear dynamics and delay differential equat
 ions. Currently she is working on emergent behavior in active fluids such 
 as the motion of organelle filaments on motility assays and in the formati
 on of quasipatterns - patterns that never repeat and yet seem the same whe
 n rotated appropriately.
LOCATION:Online: https://timeout.srcf.net/oes22-ors-efn
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