[Todos] Recordatorio: Seminario "Biological Plywoods: Lessons from Nature's Fibrous Composites"

[Ezequiel Soule]

_*Biological Plywoods: Lessons from Nature's Fibrous Composites*__
_
Lugar y fecha: Aula Magna, miércoles 10 de mayo a las 11:00 hs

Disertante: *Alejandro Rey*
El profesor Alejandro Rey, originario de Argentina, es profesor en la 
Universidad McGill desde 1988, y director del Grupo de Investigación en 
Modelado de Materiales perteneciente al Departamento de ingeniería 
Química de dicha universidad. Ha dictado cursos en nuestra institución 
como profesor visitante en dos ocasiones en el marco del subsidio 
Milstein del programa raíces, y actualmente se encuentra visitando 
nuestra institución por tercera vez en el marco el subsidio Milstein y 
del programa DOCTORAR.

_Resumen:_
This seminar presents recent theory and simulation results on the 
structure, self-assembly, and functionality of biological plywood 
materials [1,2], an ubiquitous  material organization found throughout 
Nature, including  plant cell walls, exocuticles of insects, bone, and 
cornea. The key points of the talk are to demonstrate the principles 
used by Nature to develop stiff, strong, tough, multifunctional 
materials from simple rod-like filaments and to show a few examples 
based on biomimetic engineering on how to use the  plywood architecture 
in optical and sensor devices.
The talk first describes how directed chiral self-assembly creates 3D 
fiber architectures with well defined pitches, a structural feature 
behind most of the structure-property relations. The presence of  chiral 
fiber ordering is detected by the presence of "arc patterns" which is 
ubiquitous also in man-made macroscopic plywoods, but to extract precise 
fiber ordering requires geometric modeling. Here we show applications of 
the technique to a Costa Rican's beetle  and to green algae. Finally we 
study the nano-wrinkling in surface layers of biological plywoods, which 
are responsible for optical functionalities and explain the diffraction 
patterns and color changes in tulip-like materials. A model for a 
bio-inspired color-based water sensor concludes the talk.

1. A.D. Rey, "Liquid Crystal Models of Biological Materials and 
Processes”, Soft Matter, 6-5, 3402-3429, 2010.
2. 
https://publishing.aip.org/publishing/journal-highlights/understanding-natures-most-striking-colors


-- 
Dr. Ezequiel R. Soulé
División Polímeros Nanoestructurados - INTEMA
Facultad de Ingeniería, UNMdP
Av. Juan B. Justo 4302 - (7600) Mar del Plata,
Buenos Aires, Argentina
TE: (54-223) 481-6600 int 240

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