X-ray scattering in the vorticity direction and rheometry from confined fluids

Pfleiderer, Patrick; Baik, Seung Jae; Zhang, Zhenkun; Vleminckx, Giovanni; Lettinga, M. P.; Grelet, Éric; Vermant, Jan; Clasen, Christian

doi:10.1063/1.4881796

Cited by 8 publications

(9 citation statements)

References 65 publications

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“…2l and placing it on the bottom shearing plate, Fig. 2m (Baik et al 2011;Pfleiderer et al 2014). Random distribution of the peaks of the ground surfaces assure an even contact without penetration of the roughened surface.…”

Section: Microgap Rheometrymentioning

confidence: 98%

Rheology of microgels in single particle confinement

et al. 2015

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In this work, we investigate the shear rheology of Carbopol 981 microgel particle suspensions, confined between shearing plates with gap separations from 5 to 100 μm. We show that even for confining gaps smaller than that of the gel particle size, the yielding of concentrated microgel suspensions is delayed to stress levels above the bulk yield stress. Furthermore, for stresses below this new yield point, slip is described by elastohydrodynamic lubrication theory as long as the direct confinement of the single gel particles between the shearing surfaces is limited to a Hertzian deformation. For a strong, non-Hertzian particle deformation, the slip layer breaks down and leads to a frictional interaction of the single confined particle with the two shearing surfaces, depending on their surface roughness. Lubrication pressures and friction coefficients have been quantified with in situ normal force measurements on the confined particles, which have also been utilized to unambiguously determine the relevant swollen particle dimensions.

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Section: Microgap Rheometrymentioning

confidence: 98%

Rheology of microgels in single particle confinement

et al. 2015

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“…The authors concluded that the enhanced mobility was caused by fluctuations of the entanglement mesh within the local environment of the nanoparticles and further that the subdiffusive nature of the motion provided a measure of the temporal behavior of these fluctuations.VI. SUMMARY AND PROSPECTS FOR THE FUTUREThe past decade has seen a number of advances in the application of SAXS and SANS to characterize in situ the microstructural response of complex fluids and disordered soft solids during shear rheology and other modes of deformation and flow[55][56][57], and such techniques are becoming an increasingly mainstream tool in soft matter research. However, a full understanding of the interdependence of macroscopic rheology and microscopic response requires information not only about changes in structure caused by flow but also about the structural dynamics induced or influenced by applied stress.The example discussed in Section III B 1 above of the microstructural origins of yielding in concentrated nanocolloidal gels illustrates this point.…”

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confidence: 99%

Rheo-XPCS

Leheny

Rogers

Chen

et al. 2015

Current Opinion in Colloid & Interface Science

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We review recent efforts and discuss future prospects in research employing x-ray photon correlation spectroscopy (XPCS) to interrogate the nanometer-scale structural dynamics of soft materials undergoing in situ mechanical deformation and flow. Examples of such rheo-XPCS experiments include those incorporating conventional homogeneous shear deformation, including notably large amplitude oscillatory shear (LAOS), as well as other modes of flow and deformation, such as tensile strain and flow within microfluidic environments. Particular attention is given to opportunities in such studies to reveal the structural dynamics associated with nonlinear rheological behavior such as yielding. We also review recent related work employing XPCS as a microrheological tool by tracking nanoparticle mobility within complex fluids.

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“…who studied liquid crystals and polymer lattices, by Polushkin et al . who developed a tooth geometry to study the alignment of block copolymers, by Pfleiderer et al . who built a set‐up that allowed for X‐ray scattering studies of fluids in the vorticity direction, and by Struth et al .…”

Section: Hyphenated Rheology Techniquesmentioning

confidence: 99%

Polymer Crystallization Studied by Hyphenated Rheology Techniques: Rheo‐NMR, Rheo‐SAXS, and Rheo‐Microscopy

Räntzsch

Özen

Ratzsch

et al. 2018

Macro Materials & Eng

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Rheological set‐ups with in situ analytical sensors, combine information on the flow and deformation behavior of soft matter, with simultaneous insights into structural and dynamic features. Furthermore, they permit the study of soft matter under well‐defined flow conditions. Herein are presented hyphenations of rheology and nuclear magnetic resonance (NMR), small angle X‐ray scattering (SAXS), and optical microscopy. They are employed to unravel relationships between the molecular dynamics, morphology, and rheology of crystallizing polymers. The results confirm a physical gelation process during polymer crystallization, mediated by the interaction of growing superstructures at volume fractions of 10–15%. The buildup of row‐nucleated structures during flow‐induced crystallization is found to reduce the time of gelation as detected by the rheological response. These investigations help to clarify the crystallization mechanism, structure–property relationships, and the hardening behavior of crystallizing polymers.

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X-ray scattering in the vorticity direction and rheometry from confined fluids

Cited by 8 publications

References 65 publications

Rheology of microgels in single particle confinement

Rheology of microgels in single particle confinement

Rheo-XPCS

Polymer Crystallization Studied by Hyphenated Rheology Techniques: Rheo‐NMR, Rheo‐SAXS, and Rheo‐Microscopy

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