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Designing novel functional materials made of active colloids: the role played by interactions

Presented by: 
Chantal Valeriani Universidad Complutense de Madrid
Tuesday 15th January 2019 - 15:15 to 16:00
INI Seminar Room 1
Active matter systems are composed of constituents that consume energy in order to move or exert mechanical forces, constantly driving themselves away from equilibrium [1]. Examples of active particles at the mesoscopic scale are living, such as bacteria, or artificial, such as active colloids [2,3] Experiments on spherical man-made self-propelled colloids have shown that active particles present interesting emergent collective properties [4–6], such as motility-induced phase separation (MIPS), involving spontaneous assembly of particles due to the persistence of their direction of motion [7]. An example of colloids undergoing MIPS under suitable conditions are Active Brownian Particles (ABP), i.e. self-propelled Brownian particles interacting with each other via a purely repulsive potential [8]. In order to design novel functional materials, one might need to gain control on the self-assembly process of active colloids. With this goal in mind, we have explored the competition between activity and a broad range of interactions in a suspension of active colloids, considering either isotropic (strongly repulsive [9], attractive [10,11], micelle-inducing potential [12]) or anisotropic (Janus-like) potential[13], unravelling the relevance of hydrodynamics [11,14] and investigating mixtures of active/passive particles [15,16,17]. REFERENCES: [1] C. Bechinger et al. Rev. Mod. Phys. 88, 045006 (2016). [2] W.F. Paxton et al. Chem. Commun. 441, 3 (2005). [3] S. Fournier-Bidoz et al. J. Am. Chem. Soc. 126, 13424 (2004). [4] S. Thutupalli, R. Seemann, S. Herminghaus New J. Phys. 13, 073021 (2011). [5] D. Nishiguchi, Masaki S. Phys. Rev. E 92, 052309 (2015). [6] I. Buttinoni, J. Bialké, F. Kümmel, H. Löwen, C. Bechinger, T. Speck. Phys.Rev. Lett. 110, 238301 (2013). [7] M.E. Cates, J. Tailleur. Annu. Rev. of Condens. Matt. Phys. 6, pp. 219-244 (2015). [8] S.Mallory, C.Valeriani and A.Cacciuto Annual review of Physical Chemistry, 69 59 (2018) [9] Diego Rogel Rodriguez, Francisco Alarcon, Raul Martinez, Jorge Ramirez, and Chantal Valeriani, in preparation (2018) [10] B. Mognetti, A. Saric, S. Angioletti-Uberti, A. Cacciuto, C. Valeriani and D. Frenkel Phys.Rev.Lett., 111 245702 (2013) [11] F.Alarcon, C.Valeriani and I.Pagonabarraga Soft Matter 10.1039/C6SM01752E (2017) [12] C.Tung, J.Harder, C.Valeriani and A.Cacciuto, Soft Matter 12 555 (2016) [13] S.Mallory, F.Alarcon, A.Cacciuto and C.Valeriani New Journal of Physics (2017) [14] F.Alarcon, E.Navarro, C.Valeriani and I.Pagonabarraga, PRE submitted (2018) [15] J.Harder, S.Mallory, C.Tung, C.Valeriani and A.Cacciuto, J.Chem.Phys. 141 194901 (2014) [16] R.Martinez, F.Alarcon, D.R.Rodiguez, J.L.Aragones and C.Valeriani, EPJE 41 91 (2018) [17] Diego Rogel Rodriguez, Francisco Alarcon, Raul Martinez, Jorge Ramirez, and Chantal Valeriani, under review JCP (2018) CO-AUTHORS: Francisco Alarcon, Raul Martinez, Juan Luis Aragones, Jorge Ramirez, Stewart Mallory, Ignacio Pagobanarraga, Angelo Cacciuto
University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons