The Structure and Rheology of Complex Fluids

Kröger, Martin; Vermant, Jan

doi:10.1515/arh-2000-0024

Cited by 73 publications

(109 citation statements)

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“…e exponential increment in the energy can also be analyzed from a microscopic perspective. At higher concentrations, additional energy is demanded from the system to break the droplets and reduce their size in order to achieve an increased packing degree [51]. It is known that the relationship between the droplet mean diameter and the energy incorporated is exponential and the resulting exponent depends on the emulsification process [47,52].…”

Section: Resultsmentioning

confidence: 99%

A Multiscale Approach to the Design and Manipulation of Oil-in-Water Emulsion-Based Products

Gomez

Pradilla

Álvarez

2021

International Journal of Chemical Engineering

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Advances in computational technology and high-throughput modeling software have given rise to the tailored design of products that require accurate mathematical relationships for their assessment. Industrial emulsion-based products, ubiquitous to everyday life, are complex systems driven by interfacial phenomena that require quick property-prediction tools for their commercialization. In this work, by means of a multiscale approach, mathematical relationships to model oil-in-water emulsions and that can be applied to any commercial emulsion-based product are proposed. The energy consumption during the emulsification process ( E v , which transitions from monotonic increase to exponential growth at 80% w / w ), a parameter responsible for finished product performance, was linked to final product properties at three different levels: (i) molecular, through the dynamics of the interdroplet interactions given their distribution and structure at a microscopic level; (ii) microscopic, through average droplet size yielding an inversely proportional exponential relationship ( D 4,3 ∝ E v − 4 ); and (iii) macroscopic, through the plateau value of the elastic modulus and the flow behavior index leading to inversely proportional quadratic relationships ( G ′ ∝ E v − 2 and η ∝ E v − 2 , respectively). These relationships are valid at dispersed phase concentrations beyond the 60% w / w threshold where the packing of the droplets changes the emulsion’s microscopic structure giving rise to Van der Waals forces-driven phenomena. Finding this threshold allowed expanding the concentration ranges of previously reported models. The main expectation is that these results will aid researchers and process/product designers to optimize their work in different industrial applications.

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Section: Resultsmentioning

confidence: 99%

A Multiscale Approach to the Design and Manipulation of Oil-in-Water Emulsion-Based Products

Gomez

Pradilla

Álvarez

2021

International Journal of Chemical Engineering

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“…3c shows the frequency dispersion of G' and G" of F8H18 monolayers measured under a slight variation in area per molecule: 50 Å 2 (π = 0 mN/m), 40 Å 2 (π = 0 mN/m), 33 Å 2 (π = 1 mN/m), and 31 Å 2 (π = 8 mN/m). At a surface pressure of zero (A = 50 and 40 Å 2 ), the power law exponents in the double logarithmic plots for both G′ and G″ are ≈1, which is a characteristic of a soft glassy material 63,64 . Notably, the exponents of G' become zero as soon as the surface pressure becomes positive, but the G″ exponents remain constant at ≈1.…”

Section: à ámentioning

confidence: 93%

Higher-order mesoscopic self-assembly of fluorinated surfactants on water surfaces

2023

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Surfactants containing fluorocarbon chains have been increasingly studied because they self-assemble into a variety of microscopic and mesoscopic domains and tend to form highly ordered patterns at the air/water interface; these patterns are clearly different from those formed by their hydrocarbon analogs. Focusing on the fluorinated surfactants possessing unique physical characteristics, this review describes the relationship between the line tension and dipole interaction, which is the comprehensive principle governing the pattern formation of two-dimensional self-assemblies. This review further discusses several key experimental and analytical techniques that are useful for characterizing the shape, size, correlation, and viscoelasticity of hierarchical self-assemblies on water surfaces. Finally, several biomedical applications, including biomimetic surface coating, multimodal contrast agents in medical diagnostics, and controlled delivery of gases (O2 and NO) for oxygenation and antimicrobial effects, are introduced to highlight how the unique physicochemical properties of fluorinated self-assemblies can be applied in materials science.

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“…Furthermore, when scaling the frequency sweeps by the Deborah number (De = ωτ0, a measure of the viscoelasticity of a system), 36,37 all of the data for the PEG-BCA and PEG-CBCA hydrogels collapsed onto a master curve (Figure 2c), further indicating the suitability of the single-mode Maxwell model for these data.…”

Section: Small Amplitude Oscillatory Shear Rheometrymentioning

confidence: 99%

Shear Thickening Behavior in Injectable Tetra-PEG Hydrogels Cross-Linked via Dynamic Thia-Michael Addition Bonds

Crowell

FitzSimons

Anslyn

et al. 2023

Preprint

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Injectable poly(ethylene glycol)-based hydrogels were reversibly crosslinked through thia-conjugate addition bonds and demonstrated to shear thicken at low shear rates. In this system, crosslinking bond exchange kinetics and polymer concentration were leveraged to tune hydrogel plateau moduli (about 60 - 650 Pa) and relaxation times (2 - 8 seconds). These properties affected the shear thickening behavior of the hydrogels, including the onset of shear thickening (at a Weissenberg number of 0.2) and the degree of shear thickening (up to 4.5 fold) that was achieved before a flow instability occurred. Despite the shear thickening behavior of the hydrogels at low shear rates, the hydrogels were injectable, with injection forces that increased with a higher polymer concentration and slower bond exchange kinetics. Altogether, these results demonstrate shear thickening in reversibly crosslinked, injectable tetra-PEG hydrogels and show design parameters by which the shear thickening behavior and injection force can be tuned.

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The Structure and Rheology of Complex Fluids

Cited by 73 publications

References 0 publications

A Multiscale Approach to the Design and Manipulation of Oil-in-Water Emulsion-Based Products

A Multiscale Approach to the Design and Manipulation of Oil-in-Water Emulsion-Based Products

Higher-order mesoscopic self-assembly of fluorinated surfactants on water surfaces

Shear Thickening Behavior in Injectable Tetra-PEG Hydrogels Cross-Linked via Dynamic Thia-Michael Addition Bonds

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