| Issue |
Europhys. Lett.
Volume 64, Number 5, December 2003
|
|
|---|---|---|
| Page(s) | 709 - 715 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2003-00283-5 | |
| Published online | 01 November 2003 | |
Two-dimensional shear modulus of a Langmuir foam
1
Laboratoire de Spectrométrie Physique (UMR 5588 CNRS, Université J. Fourier Grenoble 1) BP 87, F-38402 Saint Martin d'Hères cedex, France
2
Laboratoire des Milieux Désordonnés et Hétérogènes (UMR 7603 CNRS, Université Paris 6) case 78, 4 place Jussieu, F-75252 Paris cedex 05, France
3
Max Planck Institut of Colloids and Interfaces Am Mühlenberg 1, D-14476 Golm, Germany
Corresponding author: graner@ujf-grenoble.fr
Received:
13
May
2003
Accepted:
16
September
2003
We deform a two-dimensional (2D) foam, created in a Langmuir
monolayer, by applying a mechanical perturbation, and
simultaneously image it by Brewster-angle microscopy. We
determine the foam stress tensor (through a determination of the
2D gas-liquid line tension, 
)
and the statistical strain tensor, by analyzing the images of the
deformed structure. We deduce the 2D shear modulus of the foam,
. The foam effective rigidity
is predicted to be 
, which agrees
with the value 
obtained in an
independent mechanical measurement.
PACS: 83.80.Iz – Emulsions and foams / 68.18.-g – Langmuir-Blodgett films on liquids / 62.20.Dc – Elasticity, elastic constants
© EDP Sciences, 2003
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