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Title: Nonlinear viscoelasticity of fat crystal networks

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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
OSTI Identifier:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Rheologica Acta; Journal Volume: 57; Journal Issue: 3
Country of Publication:
United States

Citation Formats

Macias-Rodriguez, Braulio A., Ewoldt, Randy H., and Marangoni, Alejandro G. Nonlinear viscoelasticity of fat crystal networks. United States: N. p., 2018. Web. doi:10.1007/s00397-018-1072-1.
Macias-Rodriguez, Braulio A., Ewoldt, Randy H., & Marangoni, Alejandro G. Nonlinear viscoelasticity of fat crystal networks. United States. doi:10.1007/s00397-018-1072-1.
Macias-Rodriguez, Braulio A., Ewoldt, Randy H., and Marangoni, Alejandro G. 2018. "Nonlinear viscoelasticity of fat crystal networks". United States. doi:10.1007/s00397-018-1072-1.
title = {Nonlinear viscoelasticity of fat crystal networks},
author = {Macias-Rodriguez, Braulio A. and Ewoldt, Randy H. and Marangoni, Alejandro G.},
abstractNote = {},
doi = {10.1007/s00397-018-1072-1},
journal = {Rheologica Acta},
number = 3,
volume = 57,
place = {United States},
year = 2018,
month = 2
  • The rheology of fats is essential for the development of homogeneous and continuous layered structures of doughs. Here, we define laminating shortenings in terms of rheological behavior displayed during linear-to-nonlinear shear deformations, investigated by large amplitude oscillatory shear rheology. Likewise, we associate the rheological behavior of the shortenings with structural length scales elucidated by ultra-small angle x-ray scattering and cryo-electron microscopy. Shortenings exhibited solid-like viscoelastic and viscoelastoplastic behaviors in the linear and nonlinear regimes respectively. In the nonlinear region, laminating shortenings dissipated more viscous energy (larger normalized dynamic viscosities) than a cake bakery shortening. The fat solid-like network of laminatingmore » shortening displayed a three-hierarchy structure and layered crystal aggregates, in comparison to two-hierarchy structure and spherical-like crystal aggregates of a cake shortening. We argue that the observed rheology, correlated to the structural network, is crucial for optimal laminating performance of shortenings.« less
  • A model, previously introduced to describe the linear dynamics of entangled, reversibly breakable polymers, is extended to describe nonlinear effects. This extension of the model requires that (1) the nonlinear effects of a flow enter solely through its influence on polymer diffusion (not through any direct effect on the reaction rates for chain scission and recombination processes) and (2) the stress is dominated by polymer entropy contributions. With these assumptions, the viscoelastic functions are predicted to closely resemble those of the Doi-Edwards/Marrucci theory for monodisperse unbreakable polymers. The status of each assumption is discussed, with reference to recent experiments onmore » viscoelastic solutions of polymer-like surfactant micelles.« less
  • The boric acid flux reactions of uranyl nitrate with sodium, potassium, rubidium, or thallium fluoride result in the formation of a novel family of uranyl(VI) fluoroborate materials. These compounds are Na[(UO₂)B₅O₈(OH)F]·H₂O (NaUBOF-1), K[(UO₂)B₅O₈(OH)F] (KUBOF-1), K₁₁[(UO₂)₆B₂₄O₃₆F₂₂)](H₂BO₃) (KUBOF-2), Rb[(UO₂)B₅O₈(OH)F] (RbUBOF-1), and Tl[(UO₂)B₅O₈(OH)F] (TlUBOF-1). A new neptunium(VI) fluoroborate that is isotypic with NaUBOF-1, Na[(NpO₂)B₅O₈(OH)F]·H₂O (NaNpBOF-1), was synthesized via the boric acid flux reaction of neptunium(VI) nitrate with sodium fluoride. These new actinide fluoroborates share a common structural motif consisting of a linear actinyl (U(Np)O₂ 2+) cation surrounded by BO₃ triangles and BO₄ tetrahedra to create an U(Np)O₈ hexagonal bipyramidal environment around uranium ormore » neptunium. The borate anions bridge between actinyl units to create layers. B–F bonds were formed during the reactions to yield BO₃F tetrahedral units. The BO3F tetrahedra and additional BO₃ triangles extend from the actinyl polyborate layers and are directed approximately perpendicular to the layers. A novel actinyl borate layered topology was found in K₁₁[(UO₂)₆B₂₄O₃₆F₂₂)](H₂BO₃) (KUBOF-2). Except for K[(UO₂)B₅O₈(OH)F] (KUBOF-1) and K₁₁[(UO₂)₆B₂₄O₃₆F₂₂)](H₂BO₃) (KUBOF-2), all of the other actinide fluoroborate phases adopt noncentrosymmetric space groups. Tl[(UO₂)B₅O₈(OH)F] (TlUBOF-1), which can be obtained as a pure phase, displays second-harmonic generation of 532-nm light from 1064-nm light.« less