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Statistical Mechanics and transport phenomena in Active Colloidal Solids

Project description

Conducting a colloidal particle symphony with light and magnetism

Colloids consisting of particles of one substance dispersed in another are found ubiquitously in chemical and industrial applications from paint and coatings to foods and cosmetics. We understand such colloidal systems in thermodynamic equilibrium quite well. Colloidal systems out of equilibrium – so-called active colloids whose states are maintained by external forces such as light or magnetic fields – are another story. Enhancing our understanding of them will enable rational design and control for numerous high-tech applications. The EU-funded StaMACS project is applying experimental and theoretical methods to shed light on the dynamic interactions in active magnetic colloids. The focus is on crystallisation and melting of colloidal particles as well as changes in the propagation of activity through the crystals.

Objective

The objective of StaMACS is to uncover the dynamics of an active and loosely packed magnetic colloidal crystal. This system will consist of repulsive paramagnetic particles immersed in a bath of light-driven bacteria. We will have two independent ways to tune the interactions: 1) An external magnetic field will control the strength of the dipolar repulsion between colloids. 2) The intensity of light will control the motility of bacteria and thus the particle’s induced activity, both locally and globally. By combining experiments with simulations and theoretical analysis, we will reach a general understanding of this system’s dynamics, study its melting and crystallization transitions and examine how a local change in activity propagates throughout the crystal. Our findings will unveil the properties of a novel out-of-equilibrium system: an active colloidal solid. Furthermore, this work will stimulate theoretical investigation related to the kinetics of such systems, with strong implications on understanding the fundamental process of crystallization in the presence of activity. By a two-way transfer of knowledge, StaMACS will bring numerous mutual benefits to both the researcher and the host institution. Its results will represent a major contribution to the soft and active matter field with direct applications in physics, biology and material science.

Descriptors: Active Matter, Soft Matter, Statistical Mechanics, Magnetic Colloids

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

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Call for proposal

(opens in new window) H2020-MSCA-IF-2020

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Coordinator

UNIVERSITA DEGLI STUDI DI ROMA LA SAPIENZA
Net EU contribution
€ 171 473,28
Address
Piazzale Aldo Moro 5
00185 Roma
Italy
Region
Centro (IT) Lazio Roma
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 171 473,28