The role played by interactions in the assembly of active colloids

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• Chantal Valeriani (Univ Complutense Madrid)
• Tuesday 18 June 2019, 13:00-14:00
• MR11, CMS.

If you have a question about this talk, please contact Professor Mike Cates.

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 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 between active colloids, ranging from isotropic (strongly repulsive [9,15,17], attractive [10,11], micelle-inducing [12]) to anisotropic (Janus-like [13]), unravelling the relevance of hydrodynamics [11,14,16].

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. M3tt. 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 in press

(2019)

[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, in preparation (2019)

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

This talk is included in these lists:

• All CMS events
• DAMTP Statistical Physics and Soft Matter Seminar
• MR11, CMS
• Soft Matter
• bld31

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