Anharmonic magnetic deformation of self-assembled molecular nanocapsules

Details Anharmonic magnetic deformation of self-assembled molecular nanocapsules Anharmonic magnetic deformation of self-assembled molecular nanocapsules

2007-03-12

arxiv.org/abs/cond-mat/0703298v1

Phys. Rev. Lett. 98, 146101 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures, accepted in Phys. Rev. Lett

Scientific paper

High magnetic fields were used to deform spherical nanocapsules, self-assembled from bola-amphiphilic sexithiophene molecules. At low fields the deformation -- measured through linear birefringence -- scales quadratically with the capsule radius and with the magnetic field strength. These data confirm a long standing theoretical prediction (W. Helfrich, Phys. Lett. {\bf 43A}, 409 (1973)), and permits the determination of the bending rigidity of the capsules as (2.6$\pm$0.8)$\times 10^{-21}$ J. At high fields, an enhanced rigidity is found which cannot be explained within the Helfrich model. We propose a complete form of the free energy functional that accounts for this behaviour, and allows discussion of the formation and stability of nanocapsules in solution.

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