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| Home > Publications database > Bayesian estimations of orientation distribution functions from small-angle scattering enable direct prediction of mechanical stress in anisotropic materials > print |
| 001 | 893817 | ||
| 005 | 20210810182022.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevMaterials.5.065601 |2 doi |
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| 100 | 1 | _ | |a Corona, Patrick T. |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Bayesian estimations of orientation distribution functions from small-angle scattering enable direct prediction of mechanical stress in anisotropic materials |
| 260 | _ | _ | |a College Park, MD |c 2021 |b APS |
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| 520 | _ | _ | |a Properties of soft materials are influenced by their anisotropic structuring under nonequilibrium fields. Although anisotropic structure-property relationships have been extensively explored theoretically, comparison to experiments requires determination of the microstructural orientation probability distribution function (OPDF) of microstructural elements. Small angle scattering (SAS) measurements encode information about the OPDF, but tools to navigate this connection are incomplete. Here, we develop and validate an explicit framework to link arbitrary OPDFs to SAS measurements. Specifically, we propose, validate, and apply a method, maximum a posteriori scattering inference (MAPSI), whereby the OPDF may be obtained from SAS measurements using a Bayesian estimation method. Using this method, we obtain estimates of the full 3D OPDF for two model semidilute fd-virus (rodlike) dispersions at concentrations that are approximately equal to and twice the overlap concentration. From the OPDF, we calculate its second and fourth moments and compare these to predictions for a dilute suspension of rigid rods and to a recent theory for semidilute suspensions. Finally, we use both the theoretical and measured moments to calculate the stress, both for dilute and semidilute suspensions. These predictions are not only compared to each other, but also to measured values of the shear stress, and point to new insights into the behavior of suspensions of highly elongated particles in the transition between dilute and semidilute behavior. We also use this new framework to provide perspective on the connection between scalar parameterizations of scattering and the OPDF that have frequently been used in the past. The new tools developed in this work provide an unprecedented path toward experimental validation of dynamical theories of rodlike colloids and polymers, and for measurement of nonequilibrium structures and stresses of other complex fluids and soft materials with SAS. |
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| 700 | 1 | _ | |a Silmore, Kevin S. |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Adkins, Raymond |0 0000-0001-7622-2812 |b 2 |
| 700 | 1 | _ | |a Lang, Christian |0 P:(DE-Juel1)168105 |b 3 |
| 700 | 1 | _ | |a Lettinga, M. P. |0 P:(DE-Juel1)130797 |b 4 |
| 700 | 1 | _ | |a Swan, James W. |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Leal, L. Gary |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Helgeson, Matthew E. |0 0000-0001-9384-4023 |b 7 |e Corresponding author |
| 773 | _ | _ | |a 10.1103/PhysRevMaterials.5.065601 |g Vol. 5, no. 6, p. 065601 |0 PERI:(DE-600)2898355-5 |n 6 |p 065601 |t Physical review materials |v 5 |y 2021 |x 2475-9953 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/893817/files/PhysRevMaterials.5.065601.pdf |y OpenAccess |
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