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MicACol

Microrheology of two-dimensional active colloidal crystals and glasses

Total Cost €

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EC-Contrib. €

0

Partnership

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 MicACol project word cloud

Explore the words cloud of the MicACol project. It provides you a very rough idea of what is the project "MicACol" about.

stems    dilute    desirable    loosely    packed    tweezing    colloidal    partly    effort    peroxide    hydrogen    dense    intimate    oil    microorganims    materials    difficulty    structural    confinements    designed    microrheology    near    instance    platinum    repulsive    catalytic    smart    optical    unexplored    experiments    living    mechanical    mix    light    assemble    interface    nature    particles    primarily    elucidate    microswimmers    protocol    synthetic    date    environments    dispersed    motion    contact    shed    significantly    reaction    made    solid    propel    material    simulations    phases    monolayers    propelling    flat    behavior    close    glasses    self    colloids    physics    homogeneous    water    originally    serve    benchmarks    brownian    structure    entirely    ranged    engineer    lot    numerical    fundamental    passive    active    semi    crystals    equipped    forces    invested    configurations    probe    lag    coated    extensively    relation    fluctuations    mimic    amount    attractive    suspensions    quantify   

Project "MicACol" data sheet

The following table provides information about the project.

Coordinator
THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD 

Organization address
address: WELLINGTON SQUARE UNIVERSITY OFFICES
city: OXFORD
postcode: OX1 2JD
website: www.ox.ac.uk

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country United Kingdom [UK]
 Project website https://www.buttinoni.co.uk/
 Total cost 183˙454 €
 EC max contribution 183˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2016
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2017
 Duration (year-month-day) from 2017-09-04   to  2019-09-03

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD UK (OXFORD) coordinator 183˙454.00

Map

 Project objective

Self-propelling colloidal particles, originally designed to mimic living microorganims, offer exciting opportunities to engineer smart materials equipped with activity. To date, the behavior of synthetic microswimmers has been extensively studied in homogeneous environments, close to confinements and in semi-dilute suspensions. However, for materials’ design, the use of solid-like phases, such as crystals and glasses, is highly desirable. While recent numerical simulations have invested a lot of effort in understanding the structural and mechanical properties of dense colloidal materials with activity, experiments significantly lag behind. One difficulty stems, for instance, from the presence of short-range attractive forces that affect the active motion when two of more microswimmers come near contact.

In this project, we will investigate the mechanical properties of dense monolayers made partly or entirely of self-propelling colloids using microrheology. We will assemble colloidal monolayers at a flat oil/water interface, where long-ranged repulsive forces will lead to the formation of crystals and glasses with loosely-packed configurations, i.e. with particles that are far from contact. We will mix passive Brownian particles with a controlled amount of active platinum coated particles that self-propel due to a catalytic reaction with hydrogen peroxide dispersed in water. We will elucidate the intimate relation between structure, activity and mechanical properties of dense active suspensions using microrheology experiments, in which we will analyse the fluctuations of a probe driven through the active material by means of an optical tweezing. Our results will shed new light on the unexplored physics of active crystals and glasses and provide a protocol to quantify their mechanical properties. While the proposal research is primarily fundamental in nature, our findings will serve as benchmarks for the design of novel active materials and devices.

 Publications

year authors and title journal last update
List of publications.
2018 Kilian Dietrich, Giovanni Volpe, Muhammad Nasruddin Sulaiman, Damian Renggli, Ivo Buttinoni, Lucio Isa
Active Atoms and Interstitials in Two-Dimensional Colloidal Crystals
published pages: , ISSN: 0031-9007, DOI: 10.1103/physrevlett.120.268004
Physical Review Letters 120/26 2019-11-07

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