No dia 5 de novembro, pelas 14h00, o Departamento de Física do ISEL promove no Auditório A o seminário "Chirality Across Scales: Helicoidal Cellulose Structures from Nature to Adaptive Materials".
O evento terá como orador Maria Helena Godinho (i3N/CENIMAT - Centro de Investigação de Materiais | Faculdade de Ciências da Universidade de Lisboa).
Abstract:
Cellulose is a chiral polymer that forms hierarchical helicoidal structures across multiple length scales, giving rise to structural colouration, mechanical reinforcement, and stimulus-responsive motion
The handedness of these structures can vary from molecular to macroscopic levels: climbing plant tendrils display alternating left- and right-handed twists, Erodium seed awns transform into right-handed helices in response to moisture, and both chiralities contribute to the iridescence of Pollia condensata fruits at the nanoscale [1-4].
Inspired by these natural systems, this work investigates the controlled creation of curled micro/nano polymeric fibres and films.
The formation of helical shapes from initially linear polymer filaments is achieved through the intentional induction of axial asymmetry [5]. Moreover, helicoidal cellulose derived structures that demonstrate adaptive movements in response to environmental stimuli are investigated [6].
Insights gained from these naturally occurring architectures provide a foundation for developing advanced helical biopolymeric materials with distinctive optical and mechanical properties.
Acknowledgments
This work has been supported by the ERC H2020 Synergy grant 101167171 (ALCEMIST) and FCT-Fundação para a Ciência e a Tecnologia, I.P., in the scope of the projects LA/P/0037/2020, UIDP/50025/2020 and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nanofabrication i3N. European Cooperation in Science and Technology (COST) Action understanding interaction light – biological surfaces: the possibility for new electronic materials and devices (PhoBioS, CA21159).
[1] A. P. C. Almeida, J. P. Canejo, S. N. Fernandes, C. Echeverria, P. L. Almeida, M. H. Godinho, Adv. Mater. 30, 1703655 (2018).
[2] A.R.R. da Rosa, S.N. Fernandes, M. Mitov, M.H. Godinho, Advanced Functional Materials 2304286 (2023).
[3] S. Vignolini, P. J. Rudall, A.V. Rowland, A. Reed, E. Moyroud, R. B. Faden, J. J.Baumberg, B. J. Glover, U. Steiner, PNAS, 109(39), 15712 (2012).
[4] A. P. C. Almeida, L. Querciagrossa, P. E. S. Silva, F. Goncalves, J. P. Canejo, P. L. Almeida, M. H. Godinho, C. Zannoni, Soft Matter, 15(13), 2838 (2019).
[5] P. E. S. Silva, J. L. Trigueiros, A. C. Trindade, R. Simões, R. G. Dias, M. H. Godinho, F. V. De Abreu, Scientific Reports, 6(1), 23413 (2016).
[6] N. Monge, L.F.V. Pinto, E. Ferreira, P.L. Almeida, J.L. Figueirinhas, A.L. Carvalho, P.J. Sebastião, M.H. Godinho, Advanced Optical Materials, 14(4), e02728 (2016).
