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SUMMARY:Activity induced phase separation and ordering in various model so
 ft matter systems - Professor Prabal Maiti\, Indian Institute of Science\,
  Bangalore
DTSTART:20230329T133000Z
DTEND:20230329T143000Z
UID:TALK197935@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:We report scalar activity induced phase separation and crystal
 lization in a system of 3-d Lennard- Jones particles taken at state points
  spanning from gas to liquid regime using Molecular dynamics simulation (M
 D). Scalar activity was introduced by increasing the temperature of half o
 f particles (labelled ‘hot’) while keeping the temperature of the othe
 r half constant at a lower value (labelled ‘cold’). The relative tempe
 rature difference between the two subsystems is considered as a measure of
  the activity. From our simulations we observe that the two species tend t
 o phase separate at sufficiently high activity ratio. We observe similar a
 ctivity induced phase separation in a mixture of active and passive dumbbe
 lls. We also study the order-disorder transition and phase separation in a
  mixture of hot and cold spherocylinder of different aspect ratio (L/D) in
 teracting through Weeks-Chandler-Anderson (WCA) potential in three dimensi
 ons. Activity drives the cold particles through a phase transition to a mo
 re ordered liquid crystalline (LC) state and the hot particles to a state 
 of less order compared to the initial equilibrium state. The cold componen
 ts of a homogeneous isotropic (I) structure acquire nematic (N) and\, at h
 igher activity\, crystalline (K) order. Similarly\, the cold zone of a nem
 atic initial state undergoes smectic (Sm) and crystal ordering above a cri
 tical value of activity while the hot component turns isotropic. Surprisin
 gly\, activity induces LC ordering for spherocylinders having aspect ratio
  below Onsager limit. We find that the hot particles occupy a larger volum
 e and exert an extra kinetic pressure\, confining\, compressing and provok
 ing an ordering transition of the cold-particle domains. Finally\, we show
  similar activity induced phase separation and suppression of cholesteric 
 phase in a chiral system. \n\n\n\nReferences:\n1.	Scalar activity induced 
 phase separation and liquid–solid transition in a Lennard-Jones system\,
  S. S. N. Chari\, C. Dasgupta and P. K. Maiti\, Soft Matter\, 2019\, 15\, 
 7275–7285.\n2.	Heating leads to liquid-crystal and crystalline order in 
 a two-temperature active fluid of rods\,  J. Chattopadhyay\, S. S. P. Siva
 jothi\, K. Varma\, S. Ramaswamy\, C. Dasgupta and P. K. Maiti\, PRE\, 104\
 , 054610 (2021) arXiv preprint arXiv:2105.04571 (2021)\n3.	Two temperature
  activity induces liquid crystal phase inaccessible in equilibrium\, J. Ch
 attopadhyay\, S. S. P. Sivajothi\, K. Varma\, S. Ramaswamy\, C. Dasgupta a
 nd P. K. Maiti\, arXiv:2205.00667 (2022)\n4.	Phase behavior of active and 
 passive dumbbells\, Nayana V \, Shiang-Tai Lin \, Prabal K Maiti\, arXiv p
 reprint arXiv:2109.00415 (2021)\n\n
LOCATION:Unilever Lecture Theatre\, Yusuf Hamied Department of Chemistry &
 amp\; Zoom
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