title: Relating the microscopic and macroscopic response of a polymeric fluid in a shearing flow.
abstract: The microscopic and macroscopic response of a polymer solution in start-up shear flow was investigated using fluorescence microscopy of single molecules, bulk viscosity measurements, and Brownian dynamics simulations. An overshoot in viscosity was observed upon flow inception and understood via the observed molecular extension and by simulation findings. Increasing the polymer concentration up to six times the overlap concentration ( C(*)) has no effect on the character of the dynamics of individual molecules.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: H P
authors.initials: HP
authors.lastname: Babcock
authors.forename: D E
authors.initials: DE
authors.lastname: Smith
authors.forename: J S
authors.initials: JS
authors.lastname: Hur
authors.forename: E S
authors.initials: ES
authors.lastname: Shaqfeh
authors.forename: S
authors.initials: S
authors.lastname: Chu
mesh_terms: D011108:Polymers / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D011108:Polymers