Nanorheology of viscoelastic shells: Applications to viral capsids

Details Nanorheology of viscoelastic shells: Applications to viral capsids Nanorheology of viscoelastic shells: Applications to viral capsids

2007-06-15

arxiv.org/abs/0706.2214v1

Physics

Condensed Matter

Soft Condensed Matter

17 pages

Scientific paper

10.1103/PhysRevE.77.031921

We study the microrheology of nanoparticle shells [Dinsmore et al. Science 298, 1006 (2002)] and viral capsids [Ivanovska et al. PNAS 101, 7600 (2004)] by computing the mechanical response function and thermal fluctuation spectrum of a viscoelastic spherical shell that is permeable to the surrounding solvent. We determine analytically the damped dynamics of the shear, bend, and compression modes of the shell coupled to the solvent both inside and outside the sphere in the zero Reynolds number limit. We identify fundamental length and time scales in the system, and compute the thermal correlation function of displacements of antipodal points on the sphere and the mechanical response to pinching forces applied at these points. We describe how such a frequency-dependent antipodal correlation and/or response function, which should be measurable in new AFM-based microrheology experiments, can probe the viscoelasticity of these synthetic and biological shells constructed of nanoparticles.

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