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SUMMARY:Active deformation in viscoelastic thin sheets
DTSTART:20220623T140000
DTEND:20220623T153000
DTSTAMP:20260410T222825Z
UID:0b1eeabe506f46b44ad88008f5e10b5aff0b00d15397edb2bd75b166
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Daniel Matoz-Fernandez (Warsaw University\, Poland)\nHo
 w patterns and body structures are formed in plants and animals is still a
 n active research topic across disciplines. One of the early contribution
 s to explaining how complex shape emerges in life was made by D'Arcy Tho
 mpson. By applying methods and principles from the physical sciences to b
 iological problems\, Thompson demonstrated how simple mathematical reason
 ing reveals elegant explanations for complex processes giving the first f
 oundation for describing and classifying the astonishing diversity of sha
 pes and forming the living world.\n\nMorphogenesis processes are regulated
  by a complex set of chemical and mechanical cues that lead to a dynamic 
 reorganisation of cells and their environment. While the importance of bi
 ochemistry in morphogenesis\, developmental biology and tissue homeostasi
 s has been well appreciated during the last century\, only during the las
 t two decades the role of physics and mechanics has started to be uncove
 red. However\, neither biochemistry nor physics alone can individually exp
 lain the phenomena of pattern and structure that emerge in plants\, anima
 ls\, and humans.\n\nDespite significant progress in understanding the beh
 aviour of active fluids\, much less is known about how activity affects t
 he behaviour of solid and viscoelastic materials\, such as epithelial tis
 sues or biofilms. In this talk\, we will show that a viscoelastic thin sh
 eet is driven out of equilibrium by active structural remodelling (e.g.\,
  fast growth) develops a wide variety of shapes as a result of a competit
 ion between viscous relaxation and activity. In the regime where active p
 rocesses are faster than viscoelastic relaxation\, shapes that are formed
  due to remodelling are inherently out of equilibrium. The latter regime
  is of particular interest in developing a physical understanding of morph
 ogenesis\, where the embryo has to undergo a series of carefully orchest
 rated shape changes to establish the functioning organism. Our study sugg
 ests that keeping a growing system out of equilibrium increases the range
  of available morphologies. These observations point to a robust mechanis
 m by which a system that is kept out of equilibrium could be steered towa
 rd the desired shape by chemical regulation of remodelling\, relaxation\
 , and mechanical parameters.\n\nFurther Reading\n1. Siyu Li\, D. A. Matoz-
 Fernandez\, Monica Olvera de la Cruz. ACS nano 2021.\n2. Siyu Li\, D. A. M
 atoz-Fernandez\, Aaveg Aggarwal\, and Monica Olvera de la Cruz. Proc. Nat
 l. Acad. Sci. U.S.A\, 118\, no. 10 (2021).\n3. D. A. Matoz-Fernandez\, Fo
 rdyce A. Davidson\, Nicola R. Stanley-Wall\, and Rastko Sknepnek. Phys. R
 ev. Research 2\, 013165\, 2020\n4. A. Mietke\, F. Jülicher\, and I. F. S
 balzarini. Proc. Natl. Acad. Sci. 116\, 29 (2019).\n5. T. Ruiz-Herrero\, T
 . G. Fai\, and L. Mahadevan\, Phys. Rev. Lett. 123\, 038102 (2019).\n6. E.
  Efrati\, E. Sharon\, and R. Kupferman\, J. Mech. Phys. Solids 57\, 762 (2
 009).\n 
LOCATION:BSP 233
STATUS:CONFIRMED
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