# 2017 CAP Congress / Congrès de l'ACP 2017

28 May 2017 to 2 June 2017
Queen's University
America/Toronto timezone
Welcome to the 2017 CAP Congress! / Bienvenue au congrès de l'ACP 2017!

## Rearrangement of 2D clusters of droplets under compression: transition from crystal to glass

29 May 2017, 14:45
15m
BioSci 1102 (Queen's University)

### BioSci 1102

#### Queen's University

CLOSED - Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM)

### Speaker

Jean-Christophe Ono-dit-Biot (McMaster University)

### Description

A crystal and a glass are different at a molecular level which leads to strong consequences at the macroscopic scale. We have developed an ideal experimental system to model such structures. The 2D clusters are made of an emulsion of lightly attractive, stabilized oil droplets ($R \sim 10$ $\mu m$) in water which are assembled droplet by droplet (tens of droplets). We study the response of the cluster when it is compressed between two thin glass rods ($R_c \sim 10$ $\mu m$). One glass rod is used as a force transducer in order to measure the forces as the droplets spatially rearrange under compression. Coupling the optical microscopy images of structural rearrangements within the 2D cluster with the direct force measurements provides insight into the failure mechanisms. Perfectly ordered crystals (highly monodisperse droplets) show well defined transitions. As the number of defects (substitution of a droplet by a smaller one) is increased in the crystal, we can study the transition toward a glassy system (bidisperse cluster). Additionally, the impact of the size of the cluster, the geometry of the initial aggregate, the relative size of a defect or even its position can be studied.

### Primary author

Jean-Christophe Ono-dit-Biot (McMaster University)

### Co-authors

Mr Solomon Barkley (McMaster University) Mr Eric Weeks (Emory University) Dr Thomas Salez (ESPCI Paris) Mr Elie Raphael (ESPCI Paris) Mr Kari Dalnoki-Veress (McMaster University)

### Presentation Materials

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