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SUMMARY:Bio-inspired Photonics: from nature to applications - Dr Silvia Vi
 gnolini ( Department of Chemistry)
DTSTART:20190220T140000Z
DTEND:20190220T150000Z
UID:TALK116854@talks.cam.ac.uk
CONTACT:Ian Wilson
DESCRIPTION:The most brilliant colours in nature are obtained by structuri
 ng transparent materials on the scale of the wavelength of visible light. 
 By controlling/designing the dimensions of such nanostructures\, it is pos
 sible to achieve extremely intense colourations over the entire visible sp
 ectrum without using pigments or colorants. Colour obtained through struct
 ure\, namely structural colour\, is widespread in the animal and plant kin
 gdom [1]. Such natural photonic nanostructures are generally synthesised i
 n ambient conditions using a limited range of biopolymers. Given these lim
 itations\, an amazing range of optical structures exists: from very ordere
 d photonic structures [2]\, to partially disordered [3]\, to completely ra
 ndom ones [4]. \n\nIn this seminar\, I will introduce some striking exampl
 e of natural photonic structures [2-4] and review our recent advances to f
 abricate bio-mimetic photonic structures using the same material as nature
 . Biomimetic with cellulose-based architectures enables us to fabricate no
 vel photonic structures using low cost materials in ambient conditions [6-
 7]. Importantly\, it also allows us to understand the biological processes
  at work during the growth of these structures in plants.\n\n[1] Kinoshita
 \, S. et al. (2008). Physics of structural colors. Rep. Prog. Phys. 71(7)\
 , 076401. \n\n[2] Vignolini\, S. et al. (2012). Pointillist structural col
 or in Pollia fruit. PNAS 109\, 15712-15716.\n\n[3] Moyroud\, E. et al. (20
 17). Disorder in convergent floral nanostructures enhances signalling to b
 ees. Nature 550\, 469.\n\n[4] Burresi M. et al. (2014) Bright-White Beetle
  Scales Optimise Multiple Scattering of Light. Sci. Rep.  4\,  727\n\n[5] 
 Parker R. et al. (2018) The Self-Assembly of Cellulose Nanocrystals: Hiera
 rchical Design of Visual Appearance. Adv Mat 30\, 1704477\n\n[6] Parker R.
  et al. (2016). Hierarchical Self-Assembly of Cellulose Nanocrystals in a 
 Confined Geometry. ACS Nano\, 10 (9)\, 8443–8449\n\n[7] Liang H-L. et al
 . (2018). Roll-to-roll fabrication of touch-responsive cellulose photonic 
 laminates\, Nat Com 9\, 4632\n\n
LOCATION:Department of Chemical Engineering and Biotechnology\, West Cambr
 idge Site\, LT1
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