Séminaire d'institut

Vendredi 12 Janvier 2018 à 11h00.

Harnessing soft interfaces with light and magnets: metafluidics, coffee ring diagnostics and dissipative 2D colloidal crystals

Damien Baigl
(UMR 8640 PASTEUR, Department of Chemistry, Ecole Normale Supérieure, Paris, France http://www.baigllab.com/)

Nautibus C4

Invité(e) par
Marie Le Merrer

présentera en 1 heure :

''We actuate various biological and synthetic systems (DNA, proteins, colloids, fluids, drops) by exploiting their intrinsic soft matter properties, either to perform useful processes in a novel and simpler way or to study curious/unexpected phenomena. In this talk, I will focus on some of these processes to illustrate the crucial role of interfaces in making such behaviors possible. I will first show that, using photosensitive surfactants, the optical modulation of interfacial energies [1] allows us to control the flow [2] and mixing [3] behaviors in microfluidic devices (light-driven microfluidics) [4] as well as to manipulate discrete drops (digital optofluidics) [5] and liquid marbles[6], with a simple LED as the sole power source. I will also describe a new principle of fluid actuation with magnets that can work on any kind of liquid (including nonmagnetic ones) without any magnetic particles [7] and I will explain how an interface can make a floating object move against the flow [6]! I will also illustrate the crucial role of interactions [8,9] with/at interfaces as well as interfacial/bulk flows [10] in evaporating colloidal suspension [11]. As a consequence, we can use light to cancel or modulate the so-called coffee-ring effect [8] as well as optically guide the deposition of any kind of particles into desired 2D or 3D patterns [10]. Following similar principles, I will further show how the simple visual inspection of a stain left after the evaporation of a drop containing proteins allows us to detect a pathogenic mutation, thus constituting a new concept for fast and low-cost diagnostics [12]. Finally, I will describe some recent works, in which we have prepared 2D colloidal crystals at the liquid-air interface in a new and extremely simple manner [13]. Notably, we have devised a way to realize dissipative crystals that can be dynamically switched between disordered and highly crystalline states [14].

[1] A. Diguet, R.-M. Guillermic, N. Magome, A. Saint-Jalmes, Y. Chen, K. Yoshikawa, D. Baigl, Angew. Chem. Int. Ed. 2009, 48, 9281
[2] A. Diguet, H. Li, N. Queyriaux, Y. Chen, D. Baigl, Lab Chip 2011, 11, 2666
[3] A. Venancio-Marques, F. Barbaud, D. Baigl, J. Am. Chem. Soc. 2013, 135, 3218
[4] D. Baigl, Lab Chip 2012, 12, 3637 (review)
[5] A. Venancio-Marques, D. Baigl, Langmuir 2014, 30, 4207
[6] N. Kavokine, M. Anyfantakis, M. Morel, S. Rudiuk, T. Bickel, D. Baigl, Angew. Chem. Int. Ed. 2016, 55, 11183
[7] J. Vialetto, M. Hayakawa, N. Kavokine, M. Takinoue, S. N. Varanakkottu, S. Rudiuk, M. Anyfantakis, M. Morel, D. Baigl, Angew. Chem. Int. Ed. 2017, 56, 16565
[8] M. Anyfantakis, D. Baigl, Angew. Chem. Int. Ed. 2014, 53, 14077
[9] M. Anyfantakis, Z. Geng, M. Morel, S. Rudiuk, D. Baigl, Langmuir 2015, 31, 4113
[10] S. N. Varanakkottu, M. Anyfantakis, M. Morel, S. Rudiuk, D. Baigl, Nano Lett. 2016, 16, 644
[11] M. Anyfantakis, D. Baigl. ChemPhysChem 2015, 16, 2726 (review)
[12] S. Devineau, M. Anyfantakis, L. Marichal, L. Kiger, M. Morel, S. Rudiuk, D. Baigl, J. Am. Chem. Soc 2016, 138, 11623
[13] Manuscript in preparation
[14] Manuscript in preparation

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