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CATEGORIES:Theory - Chemistry Research Interest Group
SUMMARY:Non-Gaussian Diffusion in Complex Media: From Gene
 ral Theory to Colloidal Transport in Glassy Soft-H
 ard Mixtures - Dr Vittoria Sposini\, University of
  Padova
DTSTART;TZID=Europe/London:20251029T143000
DTEND;TZID=Europe/London:20251029T153000
UID:TALK232138AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/232138
DESCRIPTION:Transport phenomena in soft matter systems play a 
 fundamental role in a wide range of biological and
  industrial processes. Over the last decades\, it 
 has become clear that the motion of diffusive trac
 ers in complex and disordered environments often d
 eviates from classical Gaussian statistics describ
 ed by standard Brownian motion\, instead exhibitin
 g (almost) universally non-Gaussian behaviour. Bot
 h analytical and numerical studies have linked non
 -Gaussian diffusion to sample-to-sample variabilit
 y and/or spatio-temporal heterogeneity inherent to
  the system. This seminar aims to explore this phe
 nomenon from two distinct yet complementary perspe
 ctives. In the first part\, I will present a gener
 al theoretical framework based on the concept of s
 ubordination\, which captures the emergence of non
 -Gaussian diffusion across a broad class of comple
 x systems. In contrast\, the second part will focu
 s on a specific case study\, investigating how sys
 tem heterogeneity influences the emergence of non-
 Gaussian diffusion in the transport of colloidal n
 anoparticles through a polymeric glassy matrix com
 posed of star polymers. In particular\, I will sho
 w that the emergence of arrested phase separation 
 in this system interacts with the dynamics of hard
  spheres in a non-trivial manner\, representing an
 other possible source of effective non-Gaussian di
 ffusion. Overall\, these two perspectives together
  highlight the importance of system heterogeneity 
 in shaping transport behaviour in complex media.\n
 \nReferences:\n\n[1] V. Sposini\, S. Nampoothiri\,
  A. Chechkin\, E. Orlandini\, F. Seno\, and F. Bal
 dovin\, Phys. Rev. Lett. 132\, 117101 (2024).\n[2]
  V. Sposini\, S. Nampoothiri\, A. Chechkin\, E. Or
 landini\, F. Seno\, and F. Baldovin\, Phys. Rev. E
  109\, 034120 (2024).\n[3] K. Moser\, C.N. Likos\,
  V. Sposini\, in preparation. \n
LOCATION:Unilever Lecture Theatre\, Yusuf Hamied Department
  of Chemistry
CONTACT:Lisa Masters
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