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Viscosity Radius of Polymers in Dilute Solutions: Universal Behavior from DNA Rheology and Brownian Dynamics Simulations

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Title Viscosity Radius of Polymers in Dilute Solutions: Universal Behavior from DNA Rheology and Brownian Dynamics Simulations
 
Creator PAN, S
AHIRWAL, D
NGUYEN, DA
SRIDHAR, T
SUNTHAR, P
PRAKASH, JR
 
Subject EXCLUDED-VOLUME INTERACTIONS
FLUCTUATING HYDRODYNAMIC INTERACTION
MONTE-CARLO
EXPANSION FACTOR
ROUSE CHAINS
SHEAR-FLOW
VISCOMETRIC FUNCTIONS
INTRINSIC-VISCOSITY
2-PARAMETER THEORY
LINEAR-CHAINS
 
Description The swelling of the viscosity radius, alpha(eta), and the universal viscosity ratio, U-nR, have been determined experimentally for linear DNA molecules in dilute solutions with excess salt, and numerically by Brownian dynamics simulations, as a function of the solvent quality. In the latter instance, asymptotic parameter free predictions have been obtained by extrapolating simulation data for finite chains to the long chain limit. Experiments and simulations show a universal crossover for alpha(eta) and U-eta R from theta to good solvents in line with earlier observations on synthetic polymersolvent systems. The significant difference between the swelling of the dynamic viscosity radius from the observed swelling of the static radius of gyration is shown to arise from the presence of hydrodynamic interactions in the nondraining limit. Simulated values of alpha(eta) and U-eta R are in good agreement with experimental measurements in synthetic polymer solutions reported previously and with the measurements in linear DNA solutions reported here.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-28T12:32:28Z
2014-12-28T12:32:28Z
2014
 
Type Article
 
Identifier MACROMOLECULES, 47(21)7548-7560
0024-9297
1520-5835
http://dx.doi.org/10.1021/ma500960f
http://dspace.library.iitb.ac.in/jspui/handle/100/16539
 
Language English