3 research outputs found
Excluded volume effects on the structure of a linear polymer under shear flow
The effect of excluded volume interactions on the structure of a polymer in
shear flow is investigated by Brownian Dynamics simulations for chains with
size . The main results concern the structure factor of chains of N=300 Kuhn segments, observed at a reduced shear rate
, where is the bare shear rate and
is the longest relaxation time of the chain. At low q, where anisotropic
global deformation is probed, the chain form factor is shown to match the form
factor of the continuous Rouse model under shear at the same reduced shear
rate, computed here for the first time in a wide range of wave vectors. At high
q, the chain structure factor evolves towards the isotropic equilibrium power
law typical of self-avoiding walk statistics. The matching between
excluded volume and ideal chains at small q, and the excluded volume power law
behavior at large q are observed for orthogonal to the main
elongation axis but not yet for along the elongation direction
itself, as a result of interferences with finite extensibility effects. Our
simulations support the existence of anisotropic shear blobs for polymers in
good solvent under shear flow for provided chains are sufficiently
long.Comment: 36 pages, 11 figures, submitted to J. Chem. Phy
Thermal Theories of Continua: Survey and Developments
The international Conference "Thermocon'16" (Thermal Theories of Continua: Survey and Developments 2016) shall bring together scientists working in different disciplines of thermal theories of continua and discrete systems, such as Classical Irreversible Thermodynamics, Non- Equilibrium Thermodynamics, Rational Thermodynamics, Extended Thermodynamics, Mesoscopic Theories of Continua, GENERIC, Endoreversible Thermodynamics, Second Law Analysis, Finite Time Thermodynamics, Variational methods in Non-equilibrium Thermodynamics, Applications of Non-equilibrium Thermodynamics to complex materials, used in different fields of technology, such as nanosystems, superfluids, electromagnetic systems with internal variables, crystals with defects of dislocations, porous materials and so on, and to biophysics