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BEGIN:VEVENT
DTSTAMP:20260525T180014Z
DTSTART;VALUE=DATE-TIME:20260518T130000
DTEND;VALUE=DATE-TIME:20260518T140000
SUMMARY:WCPM\, Paddy Royall\, Warwick
TZID:Europe/London
UID:20260518-8ac672c79d8bfbdd019daa14f5bc2c52@warwick.ac.uk
CREATED:20260514T125923Z
DESCRIPTION:Networking Lunch: Outside L5\, from 12:30pm - 1pm. Title: Pre
 dicting Nucleation: is it the end of the road for the second-largest dis
 crepancy in physics? Abstract (with images): Crystallisation is among th
 e most familiar physical phenomena of everyday life. One would quite rea
 sonably imagine that it has been long understood. And yet there are many
  basic unanswered questions. Here we will tackle two. Firstly\, we enqui
 re how quickly materials crystallise. Secondly we will consider which cr
 ystal lattice structure they form. Prediction of nucleation rates in fam
 iliar materials such as water remains very challenging. In such general 
 problems\, model systems play a crucial role\, as a benchmark of theory 
 and computer simulation. Alas\, the most studied material\, colloidal ha
 rd spheres\, exhibits a wild disagreement between experiment and numeric
 al prediction of 20 orders of magnitude\, which has been dubbed “the sec
 ond-largest discrepancy in physics” [1]. Since the experimental work rel
 evant to this discrepancy was carried out in the last millennium\, we ex
 pect that developments\, such as particle-resolved studies may shed ligh
 t on this phenomenon. Such experiments are amenable to analysis with hig
 her—order structural measures. This allows us to directly investigate wh
 ether Sir Charles Frank’s conjecture that “five-fold symmetry is abhorre
 nt to crystallisation”. It is [2]. We then investigate whether fivefold 
 symmetry might explain the hard sphere nucleation discrepancy. It doesn’
 t [1]. But with careful matching of state point between experiments and 
 simulation\, we do find agreement for the energy barriers to form pre-cr
 itical nuclei [3]. The second problem\, of which crystal lattice (polymo
 rph) a system chooses has important real-world consequences. For example
 \, following clinical trials and release onto the market of the anti-AID
 S drug Ritonavir\, an unknown polymorph formed\, which was not effective
 \, leading to withdrawal of the drug from the market. We have deduced th
 e mechanism of polymorph selection in simple model systems [4\,5]. We th
 en show how our method can be used to understand polymorph selection in 
 more complex systems with many competing polymorphs [6\,7] and 3d active
  colloids [8\,9]. [1] Royall CP et al\, Rev. Mod. Phys. 96 045003 (2024)
 . [2] Taffs J. and Royall CP\, Nature Commun. 7 13225 (2016). [3] Kürten
  L\, Castagnède A\, Smallenburg F\, Royall CP\, Science Advances 12\, ea
 ec8906 . [4] Gispen W\, Coli GM.\,van Damme R\, Royall CP and Dijkstra M
 \, ACS Nano 17 8807–8814 (2023). [5] Royall CP\, J. Chem. Phys. 164 0249
 07 (2026). [6] Skipper K\, Moore FJ and Royall CP\, J. Chem. Phys. 161 1
 44308 (2024). [7] Wu X\, Skipper K\, Yang Y\, Moore FJ\, Meldrum FC\, an
 d Royall CP\, Soft Matter 21 2787-2802 (2025). [8] Sakaï N\, Skipper K\,
  Moore FJ\, Russo J and Royall CP\, Soft Matter\, 21 5204-5213 (2025). [
 9] Chao X\, Skipper K\, Royall CP\, Henkes S\, Liverpool TB\, Phys. Rev.
  Lett. 134 018302 (2025). Bio:Professor Paddy Royall is a leading resear
 cher in soft condensed matter physics and a CNRS Director of Research at
  ESPCI Paris\, and is currently a Leverhulme Visiting Professor at the U
 niversity of Warwick. His work focuses on understanding the microscopic 
 origins of complex material behaviour\, particularly in areas such as th
 e glass transition\, crystallisation\, and amorphous materials\, combini
 ng advanced experiments with computational approaches.
LOCATION:L5\, Science Concourse
CATEGORIES:WCPM
LAST-MODIFIED:20260514T125923Z
ORGANIZER;CN=Jin Kang:
END:VEVENT
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