Selective oil‐phase rheo‐MRI velocity profiles to monitor heterogeneous flow behavior of oil/water food emulsions

Serial, María Raquel; Nikolaeva, Tatiana; Vergeldt, Frank J.; Duynhoven, John van; As, Henk Van

doi:10.1002/mrc.4811

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…The amplitudes of the velocity‐encoding gradients were, respectively, in the 500‐μm‐gap and 4‐mm‐gap CC, set to (i) 1.50, 1.19, and 0.14 T m −1 for recording shear rates of

\overset{γ}{true} = 0.5, 1, and 8 s^{- 1}

or to (ii) 0.51 and 0.05 T m −1 for recording shear rates of

\overset{γ}{true} = 0.5 and 8 s^{- 1}

. To avoid chemical shift artifacts, a chemical shift selective (CHESS) suppression module, as implemented by Serial et al, [ 26 ] was used in all measurements using three 90° chemically selective pulses with bandwidth of 0.8 kHz. The offset was set to 1 or 0.1 kHz, respectively, for measurements at shear rates of

\overset{γ}{true} = 0.5 and 8 s^{- 1}

at room temperature or at shear rate of

\overset{γ}{true} = 1 s^{- 1}

under variable temperature conditions.…”

Section: Methodsmentioning

confidence: 99%

Validation of temperature‐controlled rheo‐MRI measurements in a submillimeter‐gap Couette geometry

Milc

Serial

Philippi

et al. 2021

Magnetic Reson in Chemistry

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A temperature-controlled submillimeter-gap (500 μm) rheo-magnetic resonance imaging (MRI) Couette cell has been developed to measure confined flow of soft structured materials under controlled temperature. The proposed setup enables performing rheo-MRI measurements using (i) a spatially uniform temperature control over the range 15 C to 40 C and (ii) a high spatial resolution up to 10 μm, as a consequence of the improved mechanical stability of the in-house developed rotating elements. Here, we demonstrate the performance of the cell for the rheo-MRI velocimetry study of a thixotropic fat crystal dispersion, a complex fluid commonly used in food manufacturing. The submillimeter-gap geometry and variable temperature capability of the cell enable observing the effects of shear-and temperature-induced fat recrystallization on both wall slip and shear banding under strongly confined flow. Our improved rheo-MRI setup opens new perspectives for the fundamental study of strongly confined flow, cooperative effects, and the underlying interparticle interactions and for ultimately aiding optimization of products involved in spreading/extrusion, such as cosmetics and foods.

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“…The amplitudes of the velocity‐encoding gradients were, respectively, in the 500‐μm‐gap and 4‐mm‐gap CC, set to (i) 1.50, 1.19, and 0.14 T m −1 for recording shear rates of

\overset{γ}{true} = 0.5, 1, and 8 s^{- 1}

or to (ii) 0.51 and 0.05 T m −1 for recording shear rates of

\overset{γ}{true} = 0.5 and 8 s^{- 1}

\overset{γ}{true} = 0.5 and 8 s^{- 1}

at room temperature or at shear rate of

\overset{γ}{true} = 1 s^{- 1}

under variable temperature conditions.…”

Section: Methodsmentioning

confidence: 99%

Validation of temperature‐controlled rheo‐MRI measurements in a submillimeter‐gap Couette geometry

Milc

Serial

Philippi

et al. 2021

Magnetic Reson in Chemistry

Self Cite

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“…22 1D velocity profiles were measured using a Pulsed Gradient Spin Echo (PGSE) 25 sequence, within a slice 1 mm thick along two dimensions, echo time T E = 20 ms and repetition time T R = 2 s. The duration of the velocity-encoding gradient pulses, and their inter-pulse spacing, were δ = 1 ms and ∆ = 13 ms, respectively. To avoid chemical-shift artefacts, a CHEmical Shift Selective (CHESS) suppression module, as implemented by Serial et al, 26 was used in all measurements using three 90 o chemically selective pulses with bandwidth of 0.8 kHz and offset of 1.1 kHz. The frequency-encoding read gradient provided a 10 mm-long slice over 1024 pixels, such that the spatial resolution was = ∆𝑥 10 μm.…”

Section: Waxdmentioning

confidence: 99%

Quantifying cooperative flow of fat crystal dispersions

et al. 2022

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“…To go deeper into the analysis of the time-dependent behavior of EY and MEY emulsions, conventional rheology measurements are combined with localized 1D flow profiles recorded using rheo-MRI. This technique has been extensively applied in the study of structure formation and degradation of complex systems, as well as in the investigation of transient flow in Newtonian and non-Newtonian fluids [ 16 , 23 , 24 , 25 ]. By combining rheology stress (

) measurements with shear rate

(r) profiles calculated from rheo-MRI velocity data, with

being the position along the cell gap, a local flow curve (LFC)

can be constructed as a function of time during shear treatment.…”

Section: Resultsmentioning

confidence: 99%

“…Rheological measurements were conducted on a conventional Modular Compact Rheometer 301 (MCR301, Anton Paar, Graz, Austria). For all experiments, a home built 1 mm gap Couette cell (CC) with the exact same dimensions as the cell used for rheo-MRI experiments was employed [ 16 , 25 ]. Time-dependent measurements of native EY and MEY emulsions were investigated for a total period of 500 min at 20 °C, in synchronization with rheo-MRI experiments.…”

Section: Methodsmentioning

confidence: 99%

Non-Invasive Rheo-MRI Study of Egg Yolk-Stabilized Emulsions: Yield Stress Decay and Protein Release

et al. 2022

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A comprehensive understanding of the time-dependent flow behavior of concentrated oil-in-water emulsions is of considerable industrial importance. Along with conventional rheology measurements, localized flow and structural information are key to gaining insight into the underlying mechanisms causing time variations upon constant shear. In this work, we study the time-dependent flow behavior of concentrated egg-yolk emulsions with (MEY) or without (EY) enzymatic modification and unravel the effects caused by viscous friction during shear. We observe that prolonged shear leads to irreversible and significant loss of apparent viscosity in both emulsion formulations at a mild shear rate. The latter effect is in fact related to a yield stress decay during constant shearing experiments, as indicated by the local flow curve measurements obtained by rheo-MRI. Concurrently, two-dimensional D-T2 NMR measurements revealed a decrease in the T2 NMR relaxation time of the aqueous phase, indicating the release of surface-active proteins from the droplet interface towards the continuous water phase. The combination of an increase in droplet diameter and the concomitant loss of proteins aggregates from the droplet interface leads to a slow decrease in yield stress.

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Selective oil‐phase rheo‐MRI velocity profiles to monitor heterogeneous flow behavior of oil/water food emulsions

Cited by 12 publications

References 28 publications

Validation of temperature‐controlled rheo‐MRI measurements in a submillimeter‐gap Couette geometry

Validation of temperature‐controlled rheo‐MRI measurements in a submillimeter‐gap Couette geometry

Quantifying cooperative flow of fat crystal dispersions

Non-Invasive Rheo-MRI Study of Egg Yolk-Stabilized Emulsions: Yield Stress Decay and Protein Release

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