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SUMMARY:Bioinspired soft composites and functional materials using self-as
 sembly -  Ahu Gumrah Parry\; University of Manchester 
DTSTART:20200220T150000Z
DTEND:20200220T160000Z
UID:TALK133456@talks.cam.ac.uk
CONTACT:Yonatan Calahorra
DESCRIPTION:Nature mastered use of hierarchical structures over multiple l
 ength scales to produce multi-\nfunctional materials. Mimicking such organ
 ization and functionality from simple building blocks is a\nkey challenge 
 for man-made materials. A further overarching challenge is to bridge the d
 ifferent\nlength scales to transfer the local structures to useful macrosc
 opic materials properties. In my talk\, I\nwill address selected examples 
 of self-assembling colloidal and polymer systems in nature and in\nvitro\;
  For example inspired by the striking metallic blue shine on the Pollia Co
 ndensata and\nMargaritaria Nobilis with aligned cellulosic cell walls\, we
  showed controlled self-assembly of\ncellulose nanocrystals\, allow helico
 idal-mimetic bulk materials in thin film form with digital\ncoloration 1-3
  . Cellulose derivatives also follow similar ordering and we translated th
 ose structures\ninto colorimetric pressure sensors 4 and colorimetric time
 rs 5 . Nanocelluloses also allow porous films\ntowards efficient light sca
 ttering media\, mimicking white beetles 6\,7 . Our latest work focuses on\
 nusing chitin building blocks together with different plasmonic nanopartic
 les to explore the\nproduction of metamaterials in the visible field as we
 ll as smart textiles with structural colour. In\nmy talk\, I will first gi
 ve a summary of colour formation mechanisms used in Nature and explain how
 \nself-assembly and bio-mimicry principles work. The challenges in the sca
 ling up\, self-assembly\ndynamics and material palette will also be discus
 sed 8.\n\nReferences\n\n1. Digital Color in Cellulose Nanocrystal Films- d
 oi.org/10.1021/am501995e\n2. Controlled\, Bio‐inspired Self‐Assembly o
 f Cellulose‐Based Chiral Reflectors\, doi.org/10.1002/adom.201400112\n3.
  Chiral optics of helicoidal cellulose nanocrystal films doi.org/10.1063/1
 .4978387\n4. Biocompatible and Sustainable Optical Strain Sensors for Larg
 e‐Area Applications\ndoi.org/10.1002/adom.201600451\n5. Edible cellulose
 -based colorimetric timer\, Abstracts of papers of the American Chemical S
 ociety 2019\n6. Nanocellulose composites for electronic paper displays\, A
 bstracts of papers of the American Chemical Society\,\n2015\n7. Anomalous
 ‐Diffusion‐Assisted Brightness in White Cellulose Nanofibril Membrane\
 ndoi.org/10.1002/adma.201704050\n8. Biomimetics of Structural Colours: Mat
 erials\, Methods and Applications doi.org/10.1039/9781788015806-00167
LOCATION:Goldsmiths 1\, Lecture Theatre\, Department of Materials Science 
 &amp\; Metallurgy
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