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Gianni Iacucci

I received my undergraduate degree in physics from the University of Calabria, Italy. Afterwards, I joined the Department of Chemistry at the University of Cambridge, where I am currently pursuing a PhD under the supervision of Dr Vignolini (complete CV can be found here). My research focuses on light propagation in biological and bioinspired disordered systems.

While periodic structures give rise to a colourful appearance, disordered systems scatter all the visible wavelengths with similar intensities - resulting in white colouration. The study of light propagation in disordered media is relevant both to fundamental and applied problems, ranging from imaging through turbid media to the fabrication of white paint. Scattering in a disordered system is determined by the spatial distribution and the scattering properties of its building blocks. To date, most efforts on scattering optimisation have focused on isotropic, high refractive index systems. Nature, however, provides a prime example of how to exploit anisotropy to achieve scattering optimisation: with the intra-scale chitin network of the beetle genus Cyphochilus (Figure 1).

In my PhD, I combine numerical simulations and experiments to investigate wave transport in anisotropic, disordered media. My research demonstrated that anisotropy allows for improvements in the whiteness of low refractive index media (Figure 1e). Based on this result, my work focuses on the design and characterisation of bioinspired white materials. In particular, the achievement of scattering properties in artificial low refractive index materials (n ~ 1.5) comparable to those found in nature would allow the production of biocompatible and sustainable white materials. 

Figure 1 |  Anisotropic scattering materials. a-d) Images of a white beetle at different magnifications: a) photograph of a specimen of Cyphochilus genus beetle; b) micrograph of the organisation of the scales; c-d) SEM images of a Cyphochilus’ scale from a cross-section and top view, respectively. Insets are the fast Fourier transforms of the SEM images, which show the orientational anisotropy of the chitin network. Scale bar: 1 cm for a, 300 µm for b, 1 µm for c, 2 µm for d.  e) Comparison of the simulated reflectance for systems with building blocks with n = 1.55, same volumes but different aspect ratios.

Publications

The limitations of extending nature's color palette in correlated, disordered systems
G Jacucci, S Vignolini, L Schertel
– PNAS September
(2020)
117,
23345
The limitations of extending nature's color palette in correlated, disordered systems.
G Jacucci, S Vignolini, L Schertel
– Proc Natl Acad Sci U S A
(2020)
117,
23345
Light Management with Natural Materials: From Whiteness to Transparency
G Jacucci, L Schertel, Y Zhang, H Yang, S Vignolini
– Adv Mater
(2020)
e2001215
Bioinspired scattering materials: light transport in anisotropic, disordered systems
G Jacucci
(2020)
Complex photonic response reveals three-dimensional self-organization of structural coloured bacterial colonies
L Schertel, GT van de Kerkhof, G Jacucci, L Catón, Y Ogawa, BD Wilts, CJ Ingham, S Vignolini, VE Johansen
– J R Soc Interface
(2020)
17,
20200196
Hereditary character of photonics structure in Pachyrhynchus sarcitis weevils: colour changes via one generation hybridization
Y Chang, Y Ogawa, G Jacucci, OD Onelli, HY Tseng, S Vignolini
– Advanced Optical Materials
(2020)
8,
2000432
Disordered wax platelets on: Tradescantia pallida leaves create golden shine
GT van de Kerkhof, L Schertel, R Poon, G Jacucci, B Glover, S Vignolini
– Faraday Discuss
(2020)
223,
207
Bionic 3D printed corals
D Wangpraseurt, S You, F Azam, G Jacucci, O Gaidarenko, M Hildebrand, M Kühl, AG Smith, MP Davey, A Smith, DD Deheyn, S Chen, S Vignolini
– Nature communications
(2020)
11,
1748
Retrieving the Coassembly Pathway of Composite Cellulose Nanocrystal Photonic Films from their Angular Optical Response
B Frka-Petesic, JA Kelly, G Jacucci, G Guidetti, G Kamita, NP Crossette, WY Hamad, MJ MacLachlan, S Vignolini
– Advanced materials (Deerfield Beach, Fla.)
(2020)
32,
e1906889
Visual Appearance of Chiral Nematic Cellulose-Based Photonic Films: Angular and Polarization Independent Color Response with a Twist
CLC Chan, MM Bay, G Jacucci, V Roberto, CA Williams, GT van de Kerkhof, RM Parker, K Vynck, B Frka-Petesic, S Vignolini
– Advanced materials (Deerfield Beach, Fla.)
(2019)
31,
e1905151
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Telephone number

01223 334372 (shared)