Dr. Celia Lozano

Status: Post-Doc

Phone: 07531-88-3868

celia.lozano@uni-konstanz.de

Room: P1019


I am currently a Postdoctoral Research Associate at the University of Konstanz under the supervision of Prof. Clemens Bechinger. My main research interests are in the experimental fields of Active Matter, Soft Matter, Granular Matter and Nonequilibrium Statistical Physics. In Bechinger Group, I study the behavior of self-propelled microsiwimmers in an inhomogeneous environment. To this aim, we use active colloids to understand the Active Brownian particles are capable of taking up energy from their environment and converting it into directed motion.

I completed my PhD thesis entitled 'Stability of clogging arches in granular materials under vibrations' in September of 2014 under the supervision of Prof. Iker Zuriguel and Prof. Angel Garcimartín in the University of Navarra (Spain). The motivation of this thesis is that when a group of particles flow through a bottleneck, they are prone to spontaneously developing clogs, even if the orifice size is greater than the particles. This is due to the formation of arrangements of mutually stabilizing sets of grains that appear at the bottleneck, which are called arches. To restore the flow, those arches must be shattered by an external perturbation. We also studied how to avoid the clogging formation. During my PhD studies, I worked in University of Manchester with Prof. Tom Mullin on the project “Granular segregation driven by particle interactions”. As a side project, I also worked in the University of Sydney with Prof. Fernando Alonso-Marroquin on the simulation of pedestrian dynamics using spheropolygons. Since August of 2014,I worked with Prof. Clemens Bechinger on Active Matter, first in University of Stuttgart, and since September of 2017 in the University of Konstanz.

Academic Career

- Since 2017: Senior PostDoc at University of Konstanz, Germany.

- 2014/2017: PostDoc at University of Stuttgart, Germany.

- 2013: Visiting Ph.D Student with Prof. Tom Mullin at the University of Manchester, UK.

- 2012: Visiting Ph.D Student with Dr. Fernando Alonso-Marroquin at the University of Sydney, Australia.

- 2010-2014 Ph.D. in Physics and Complex Systems co-advised by Prof. Iker Zuriguel and Prof. Angel Garcimartin. University of Navarra, Spain.

Scientific Awards

- 2015: University of Navarra Best PhD Thesis Award in Complex Systems in the academic year 2014/2015.

Publications

[21] Propagating Density Spikes in light-powered motility-ratchets C. Lozano, B. Liebchen, B. t. Hagen, C. Bechinger, H. Löwen; 2019 Soft Matter

[20] Diffusing Wave Paradox of Phototactic Particles in Traveling Light Pulses C. Lozano, C. Bechinger; 2019 Nature Communications, 10, 2495

[19] Colloidal Brazil Nut Effect in Microswimmer Mixtures induced by Motility Contrast S. Jahanshahi, C. Lozano, B. t. Hagen, C. Bechinger,  H. Löwen; 2019 J. Chem. Phys. 150, 114902

[18]  Slow relaxation dynamics of clogs in a vibrated granular silo B. V. Guerrero,  L. A. Pugnaloni, C. Lozano, I. Zuriguel, A. Garcimartín; 2018 Phys. Rev. E97, 042904

[17]  Run-and-tumble like motion of active colloids in viscoelastic media C. Lozano, R. Gomez-Solano, Clemens Bechinger; 2018 New J. Phys 20 015008

[16]  Tuning the motility and direcionality of self-propelled colloids R. Gomez-Solano,  S. Samin, C. Lozano, P. Ruedas-Batuecas, R. van Roij, Clemens Bechinger; Scientific Reports 7 (1) 14891 (2017)

[15]  Dynamics of breaking arches under a constant vibration B. Guerrero, C. Lozano, I. Zuriguel, A. Garcimartín EPJ 140, 03016 (2017)

[14]  Cluster splitting in granular segregation driven by horizontal shaking  A. Garcimartín, I. Larrea, C. Lozano, I. Zuriguel EPJ 140, 04004 (2017)

[13] Phototaxis of synthetic microswimmers in optical landscapes C. Lozano, B. ten Hagen, H. Löwen, C. Bechinger. Nature Communications 7, 12828 (2016)

[12] Stability of clogging arches in a silo submitted to vertical vibrations C. Lozano, I. Zuriguel, A. Garcimartín Physical Review E 91 (6), 062203 (2015)

[11] Granular segregation driven by particle interactions C. Lozano, I. Zuriguel, A. Garcimartín, T. Mullin. Physical review letters 114 (17), 178002 (2015)

[10] A Discrete Spheropolygon Model for Calculation of Stress in Crowd Dynamics

F. Alonso-Marroquín, J. Busch, Á. Ramírez-Gómez, C. Lozano. Traffic and Granular Flow'13, 179-186 (2015)

[9] Formation, compression and surface melting of colloidal clusters by active particles

F. Kümmel, P. Shabestari, C. Lozano, G. Volpe, C. Bechinger. Soft matter 11 (31), 6187-6191 (2015)

[8] Simulation of counterflow pedestrian dynamics using spheropolygons F. Alonso-Marroquin, C. Lozano, J. Busch, C. Chiew, Á. Ramírez-Gómez. Physical Review E 90 (6), 063305 (2014)

[7] Clogging transition of many-particle systems flowing through bottlenecks I. Zuriguel, D. R. Parisi, R. C. Hidalgo, C. Lozano, A. Janda, P. A. Gago, J. P. Peralta, L. M. Ferrer, L. A. Pugnaloni, E. Clément, D. Maza, I. Pagonabarraga, A. Garcimartín Scientific reports 4, 7324 (2014).

[6] Force analysis of clogging arches in a silo R. C. Hidalgo, C. Lozano, I. Zuriguel, A. Garcimartín Granular Matter 15 (6), 841-848 (2013).

[5] Silo clogging reduction by placing an obstacle above the outlet C. Lozano, I. Zuriguel, A. Janda, A. Garcimartín, R. Arévalo, D. Maza AIP 1542 (1), 698-701 (2013)

[4] Avoiding clogs: The shape of arches and their stability against vibrations A. Garcimartín, C. Lozano, G. Lumay, I. Zuriguel AIP 1542 (1), 686-689 (2012)

[3] Flow and clogging in a silo with an obstacle above the orifice C. Lozano, A. Janda, A. Garcimartín, D. Maza, I. Zuriguel Physical Review E 86 (3), 031306 (2012)

[2] Breaking arches with vibrations: the role of defects C. Lozano, G. Lumay, I. Zuriguel, R. C. Hidalgo, A. Garcimartín Physical review letters 109 (6), 068001 (2012)

[1] Silo clogging reduction by the presence of an obstacle I. Zuriguel, A. Janda, A. Garcimartín, C. Lozano, R. Arévalo, D. Maza Physical review letters 107 (27), 278001 (2011)