| Issue |
Europhys. Lett.
Volume 57, Number 2, January 2002
|
|
|---|---|---|
| Page(s) | 219 - 225 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00564-y | |
| Published online | 01 September 2002 | |
Shear modulus of two-dimensional colloidal crystals
1
Universität Konstanz, Fachbereich Physik, Fach M 621
D-78457 Konstanz, Germany
2
Institut C. Sadron, CNRS - 6 rue Boussingault
F-67083 Strasbourg Cedex, France
Received:
16
July
2001
Accepted:
25
October
2001
A new method for the determination of elastic constants of colloidal systems is described. We study super-paramagnetic microspheres confined by gravity to a two-dimensional layer at a water-air interface. Under an external vertical magnetic field the particles arrange in a crystalline triangular phase because of the repulsive dipole-dipole interaction. By use of an optical tweezer, one triangle formed by three spheres is rotated from its equilibrium position and the relaxation time measured using video-microscopy. We demonstrate that this time is directly related to the shear modulus μ of the crystal and study μ as a function of the magnetic particle interaction strength.
PACS: 62.20.Dc – Elasticity, elastic constants / 82.70.Dd – Colloids
© EDP Sciences, 2002
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