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Issue 1, 2009
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Elasticity of two-dimensional crystalline monolayers of fatty acid salts at an air–water surface

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Abstract

The elastic properties of organic–inorganic two-dimensional crystals floating at the water surface have been fully characterized by grazing incidence X-ray diffuse scattering and high-resolution diffraction. We show that the strong interaction between the organic molecules and the inorganic divalent cations is enough for these nm thick crystals to behave like true solids, with a residual tension of 1 × 10−4–10−3N m−1. Their bending rigidity is renormalized as κ(q) ∝ qηk with ηk = 0.25 ± 0.07 and a microscopic value ≈ 100 kBT at q = 1 × 109 m−1. The in-plane elastic constants behave like qηu with ηu = 1.41 ± 0.2, obeying the scaling relation ηu = 2 − 2ηk. These results are consistent with a long-range phonon-mediated interaction between out-of-plane fluctuations but the values of the exponents differ from those generally obtained in numerical simulations.

Graphical abstract: Elasticity of two-dimensional crystalline monolayers of fatty acid salts at an air–water surface

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Article information


Submitted
17 Jun 2008
Accepted
18 Aug 2008
First published
15 Oct 2008

Soft Matter, 2009,5, 203-207
Article type
Paper

Elasticity of two-dimensional crystalline monolayers of fatty acid salts at an air–water surface

J. Daillant, J. Pignat, S. Cantin, F. Perrot, S. Mora and O. Konovalov, Soft Matter, 2009, 5, 203
DOI: 10.1039/B810134E

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