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Comptes Rendus Physique
Volume 17, n° 5
pages 501-511 (mai 2016)
Doi : 10.1016/j.crhy.2016.02.007
Three-dimensional ultrasonic colloidal crystals
Cristaux colloïdaux ultrasonores tridimensionnels
 

Mihai Caleap , Bruce W. Drinkwater
 Faculty of Engineering, University of Bristol, BS8 1TR, United Kingdom 

Corresponding author.
Abstract

Colloidal assembly represents a powerful method for the fabrication of functional materials. In this article, we describe how acoustic radiation forces can guide the assembly of colloidal particles into structures that serve as microscopic elements in novel acoustic metadevices or act as phononic crystals. Using a simple three-dimensional orthogonal system, we show that a diversity of colloidal structures with orthorhombic symmetry can be assembled with megahertz-frequency (MHz) standing pressure waves. These structures allow rapid tuning of acoustic properties and provide a new platform for dynamic metamaterial applications.

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Résumé

L'assemblée colloïdale représente une méthode puissante pour la fabrication de matériaux fonctionnels. Dans cet article, nous décrivons comment les forces de rayonnement acoustique peuvent guider l'assemblage de particules colloïdales dans des structures qui servent d'éléments microscopiques dans les dispositifs à base de méta-matériaux acoustiques ou se comportent comme des cristaux phononiques. En utilisant un simple système orthogonal tridimensionnel, nous montrons que nombre de structures colloïdales à symétrie orthorhombique peuvent être assemblées, avec des ondes de pression stationnaires fonctionnant à des fréquences de l'ordre de quelques mégahertz (MHz). Ces structures permettent un ajustement rapide des propriétés acoustiques et fournissent une nouvelle plate-forme pour les applications de métamatériaux dynamiques.

The full text of this article is available in PDF format.

Keywords : Colloidal crystals, Acoustic assembly, Phononic crystals, Acoustic metamaterials

Mots-clés : Cristaux colloïdaux, Assemblée acoustique, Cristaux phononiques, Métamatériaux acoustiques


1  Given the plethora of applications, it is not surprising that he has recently received the Isaac Newton Medal from the Institute of Physics, for his contributions to the field of photonics.
2  Acoustic property values for these materials are  ,   for water;  ,  , for dodecane; and  ,   for polystyrene.


© 2016  The Authors. Published by Elsevier Masson SAS de la part de Académie des sciences@@#104157@@
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