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UID:20250809T101349EDT-1246OjuKfm@132.216.98.100
DTSTAMP:20250809T141349Z
DESCRIPTION:Biological extracellular tissues are based on proteins\, polysa
 ccharides and\, in certain cases\, minerals. Their complex multiscale stru
 cture confers them a wide range of properties in accordance with their fun
 ctions [1]. While active functionality are usually attributed to cells\, t
 here are also examples of materials synthesized by living organisms\, such
  as plant seeds\, which fulfil an active function without living cells and
  work as mechanosensors and actuators [2]. Water is an important component
  of all such extracellular tissues. While it is well known that the level 
 of hydration determines the mechanical properties of many biological mater
 ials\, it is less appreciated that water also plays an active role in gene
 rating forces within the materials. In particular water absorption and des
 orption provides actuation in a variety of plant seeds\, including wild wh
 eat [3]\, stone plant [4] and banksia seed capsules [5]. The shape change 
 upon water uptake that provides the actuation is controlled by specific ce
 llulose fibre architectures. In this way\, well-controlled movements\, suc
 h as bending\, twisting or curling are programmed in these materials by st
 ructure of the underlying cellulose microarchitecture [6]. The required de
 formation energy is provided by the absorption of water from the environme
 nt [7]. Such materials highlight potential concepts for sustainable materi
 als with high functionality [8]. The lecture also discusses the need for m
 ore holistic approaches involving science\, humanities and design discipli
 nes for developing a more sustainable materials economy [9].\n\nView the e
 vent flyer here.\n\nHave questions? Write to us administrator-MIAM.enginee
 ring [at] mcgill.ca (subject: Query%20on%20Seminar%20Series)  (here).\n\n[
 1] Eder+ 2018\, Science 362: 543-547\; [2] Fratzl & Barth 2009\, Nature\, 
 462: 442-448\; [3] Elbaum+ 2007\, Science\, 316: 884-886\; [4] Harrington+
  2011\, Nature Comm. 2: 337\; [5] Huss + 2018\, Adv. Sci\, 5: 1700572\; [6
 ] Guiducci+ 2015\, Adv. Mater. Interf\, 2: 1500011\; [7] Bertinetti+ 2013\
 , Phys. Rev. Lett. 111: 238001\; [8] Eder+ 2020\, Advanced Materials 20014
 12\; [9] Fratzl+ 2020\, actech discussion https://en.acatech.de/publicatio
 n/materials-research/\n\n \n
DTSTART:20210212T163000Z
DTEND:20210212T173000Z
SUMMARY:Active Composites Grown by Plants May Inspire Sustainable Materials
  by Prof Peter Fratzl (Max Planck Institute)
URL:/miam/channels/event/active-composites-grown-plant
 s-may-inspire-sustainable-materials-prof-peter-fratzl-max-planck-327427
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