Dynamics of a polymer chain confined in a membrane

. We present a Brownian dynamics theory with full hydrodynamics (Stokesian dynamics) for a Gaussian polymer chain embedded in a liquid membrane which is surrounded by bulk solvent and walls. The mobility tensors are derived in Fourier space for the two geometries, namely, a free membrane embedded in...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2011-05, Vol.34 (5), p.46-46, Article 46
Main Authors: Ramachandran, S., Komura, S., Seki, K., Gompper, G.
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biological and medical sciences
Biological membranes
Biophysics
Complex Fluids and Microfluidics
Complex Systems
Diffusion
Fundamental and applied biological sciences. Psychology
Hydrodynamics
Membrane physicochemistry
Membrane Proteins - chemistry
Membrane Proteins - metabolism
Molecular biophysics
Molecular Dynamics Simulation
Nanotechnology
Particle Size
Physics
Physics and Astronomy
Polymer Sciences
Polymers - chemistry
Polymers - metabolism
Regular Article
Soft and Granular Matter
Solvents - chemistry
Surfaces and Interfaces
Thin Films
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Summary:. We present a Brownian dynamics theory with full hydrodynamics (Stokesian dynamics) for a Gaussian polymer chain embedded in a liquid membrane which is surrounded by bulk solvent and walls. The mobility tensors are derived in Fourier space for the two geometries, namely, a free membrane embedded in a bulk fluid, and a membrane sandwiched by the two walls. Within the preaveraging approximation, a new expression for the diffusion coefficient of the polymer is obtained for the free-membrane geometry. We also carry out a Rouse normal mode analysis to obtain the relaxation time and the dynamical structure factor. For large polymer size, both quantities show Zimm-like behavior in the free-membrane case, whereas they are Rouse-like for the sandwiched membrane geometry. We use the scaling argument to discuss the effect of excluded-volume interactions on the polymer relaxation time.
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2011-11046-3