Probing Elastic Anisotropy from Defect Dynamics in Langmuir Monolayers

Jan Brugués, Jordi Ignés-Mullol, Jaume Casademunt, Francesc Sagués
2008 Physical Review Letters  
We study the dynamics of annihilation of point defects in Langmuir monolayers. The absence of hydrodynamic effects allows us to quantitatively relate the asymmetry in defect mobility to the elastic anisotropy of the material, which in turn can be varied through the control of the surface pressure applied to the monolayer. Using the proposed theoretical analysis, we are able to obtain rather elusive equilibrium properties out of relatively simple dynamical measurements. In particular, we measure
more » ... ticular, we measure the elastic constants and their pressure dependence.
doi:10.1103/physrevlett.100.037801 pmid:18233037 fatcat:zoaedaf7lrafdbgsf4eg5ykia4