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SUMMARY:Non-Gaussian Diffusion in Complex Media: From General Theory to Co
 lloidal Transport in Glassy Soft-Hard Mixtures - Dr Vittoria Sposini\, Uni
 versity of Padova
DTSTART:20251029T143000Z
DTEND:20251029T153000Z
UID:TALK232138@talks.cam.ac.uk
CONTACT:Lisa Masters
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 tracers in com
 plex and disordered environments often deviates from classical Gaussian st
 atistics described by standard Brownian motion\, instead exhibiting (almos
 t) universally non-Gaussian behaviour. Both analytical and numerical studi
 es have linked non-Gaussian diffusion to sample-to-sample variability and/
 or spatio-temporal heterogeneity inherent to the system. This seminar aims
  to explore this phenomenon from two distinct yet complementary perspectiv
 es. In the first part\, I will present a general theoretical framework bas
 ed on the concept of subordination\, which captures the emergence of non-G
 aussian diffusion across a broad class of complex systems. In contrast\, t
 he second part will focus on a specific case study\, investigating how sys
 tem heterogeneity influences the emergence of non-Gaussian diffusion in th
 e transport of colloidal nanoparticles through a polymeric glassy matrix c
 omposed of star polymers. In particular\, I will show that the emergence o
 f arrested phase separation in this system interacts with the dynamics of 
 hard spheres in a non-trivial manner\, representing another possible sourc
 e of effective non-Gaussian diffusion. Overall\, these two perspectives to
 gether highlight the importance of system heterogeneity in shaping transpo
 rt behaviour in complex media.\n\nReferences:\n\n[1] V. Sposini\, S. Nampo
 othiri\, A. Chechkin\, E. Orlandini\, F. Seno\, and F. Baldovin\, Phys. Re
 v. Lett. 132\, 117101 (2024).\n[2] V. Sposini\, S. Nampoothiri\, A. Chechk
 in\, E. Orlandini\, 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
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