Time-resolved small-angle x-ray scattering measurements of a polymer bicontinuous microemulsion structure factor under shear

Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

Volumn 66, Issue 4, 2002, Pages 18-

  Caputo, Franklin E ^a   Burghardt, Wesley R ^a   Krishnan, Kasiraman ^b   Bates, Frank S ^b   Lodge, Timothy P ^b  

^a Northwestern University   (United States)

^b University of Minnesota   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EQUILIBRIUM STRUCTURES; HOMOPOLYMERS; MICROEMULSION STRUCTURE; TIME RESOLVED SMALL-ANGLE X-RAY SCATTERING;

ANIONIC POLYMERIZATION; ANISOTROPY; EMULSIONS; FREE ENERGY; POLYMERS; RELAXATION PROCESSES; SHEAR FLOW; SYNCHROTRONS; THERMODYNAMICS; VISCOSITY;

X RAY SCATTERING;

ARTICLE;

EID: 41349120895     PISSN: 1063651X     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevE.66.041401     Document Type: Article

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24. For several shear rates, the sample was sheared in both directions. The steady state orientation angle values showed a systematic deviation between data collected in the different directions. This is manifested in Fig. 55, where the x-y component of (Formula presented) shows two distinct values at those rates where pairs of data were collected. We attribute this to a small misalignment (∼1°) between the lower plate in the flow cell fixtures and the pixel array on the detector 22. A single orientation angle correction factor was determined from all such pairs of forward/reverse steady state data, and applied after computing the orientation angle data according to Eq. (7). All orientation angle presented in this paper were so corrected. We also use the expressions (Formula presented) and (Formula presented) (based on corrected χ values) for computing the x-ray shear stress and first normal stress difference analogs, rather than using the components of the normalized second moment tensor directly.
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