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CATEGORIES:Cambridge University Physics Society
SUMMARY:Soft matter quasicrystals: when can they exist and
when will we observe them? - Dr Priya Subramanian
\, Mathematical Institute\, University of Oxford
DTSTART;TZID=Europe/London:20201007T190000
DTEND;TZID=Europe/London:20201007T203000
UID:TALK152287AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/152287
DESCRIPTION:Regular patterns (made of tiles) and crystals (mad
e of either atoms/molecules) surround us in everyd
ay life. These patterns look the same when moved b
y one unit (translational symmetry) or rotated by
certain special angles (rotational symmetry). Such
repeating arrangements are prevalent in nature as
lesser amount of energy is required to assemble t
hem. Aperiodic patterns or quasicrystals are speci
al as they possess long range order without transl
ational symmetry. Quasicrystals have recently been
observed in a variety of systems such as nanopart
icles\, metallic alloys and polymer solutions. Con
sidering the difference in scale between metallic
and polymeric quasicrystals\, there is a need for
mathematical models which explore unifying mechani
sms. We begin by exploring phase field crystal mod
els to identify the ingredients that allow for the
formation of soft matter quasicrystals. We then g
o on to a more realistic density functional theore
tic model\, where we identify features in the part
icle pair interaction potentials which can suppres
s or encourage density modes with wavenumbers asso
ciated with one of the regular crystalline orderin
gs that compete with quasicrystals\, enabling eith
er the enhancement or suppression of quasicrystals
.\n\nAbout the speaker: Dr Priya Subramanian is a
Hooke Research Fellow at the Mathematical Institut
e\, University of Oxford and a Visiting Research F
ellow at the Leeds School of Mathematics. In 2017\
, she was awarded L’Oréal-UNESCO For Women In Scie
nce UK Fellowship as PI. Her research interests li
e in understanding mechanisms that govern spatio-t
emporal patterns and emergent behaviours in system
s such as thermacoustic systems\, and transistiona
l (convective/shear) flows of fluids. Her area of
expertise also includes the fields of nonlinear dy
namics and delay differential equations. Currently
she is working on emergent behavior in active flu
ids such as the motion of organelle filaments on m
otility assays and in the formation of quasipatter
ns - patterns that never repeat and yet seem the s
ame when rotated appropriately.
LOCATION:Online: https://timeout.srcf.net/oes22-ors-efn
CONTACT:
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