Anharmonic magnetic deformation of self-assembled molecular nanocapsules.
By O. V. Manyuhina, I. Shklyarevskiy, P. Jonkheijm, P. Christianen, A. Fasolino, M. I. Katsnelson, A. Schenning, E. Meijer, O. Henze, A. Kilbinger and 2 more. 2007
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High magnetic fields were used to deform spherical nanocapsules, self-assembled from bolaamphiphilic 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. A 43, 409 (1973)10.1016/0375-9601(73)90396-4], and permit the determination of the bending rigidity of the capsules as (2.6+/-0.8) x 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 behavior, and allows discussion of the formation and stability of nanocapsules in solution.
Subfields: Biomaterials, Electrical and Electronic Engineering, Organic Chemistry
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Citations in the corpus
- Intrinsic ripples in graphene. (2007, background): “It is known that some soft condensed matter membranes tend to spontaneous bending and ripple formation [20, 21, 22] but this behaviour for elemental solids like graphene is rather unexpected.”