The effects of neutralization on the dynamic rheology of polyelectrolyte microgel mucilages

Harrington, John C.

doi:10.1002/app.36946

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…The temperature was kept constant at 20 O C using Peltier plate. The yield stress was estimated as the stress value at which the storage modulus becomes equal to the loss modulus [32,33]. The strain sweep measurements in the range 0.1-10 have been performed at frequency 1 Hz.…”

Section: Methodsmentioning

confidence: 99%

Bulk and surface rheology of Aculyn™ 22 and Aculyn™ 33 polymeric solutions and kinetics of foam drainage

Bureiko

Trybała

Huang

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Citation: BUREIKO, A., 2013 AbstractExperimental investigations of both bulk and surface rheology of solutions of commercially available polymers Aculyn TM 22 and Aculyn TM 33 in presence of sodium chloride are performed in a wide range of the polymer and salt concentrations. It is shown that the bulk viscosity and the surface viscoelastic modulus of solutions of both polymers increases with the increase of polymer concentration and the decrease of the salt concentration. Solutions of both polymers demonstrate very good foamability and form stable foams. Foam drainage is governed mainly by the bulk viscosity when the latter is in the range of 100-500 mPa·s.

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Section: Methodsmentioning

confidence: 99%

Bulk and surface rheology of Aculyn™ 22 and Aculyn™ 33 polymeric solutions and kinetics of foam drainage

Bureiko

Trybała

Huang

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Moreover, many Non-Newtonian fluids do exhibit a rheology dependence on pH. Examples include yogurt [46] ; carbopol solutions [47] ; pectin hydrogels [48] ; the gums and starch suspensions widely used in food technology applications [49] ; protein suspensions of animal origin [50] ; poly(acrylic acid) microgels [51] ; newly designed surfactants with customized architectures [52] , [53] ; and even physiologically relevant fluids such as the gastric mucin [54] .…”

Section: Resultsmentioning

confidence: 99%

Studying Mixing in Non-Newtonian Blue Maize Flour Suspensions Using Color Analysis

et al. 2014

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BackgroundNon-Newtonian fluids occur in many relevant flow and mixing scenarios at the lab and industrial scale. The addition of acid or basic solutions to a non-Newtonian fluid is not an infrequent operation, particularly in Biotechnology applications where the pH of Non-Newtonian culture broths is usually regulated using this strategy.Methodology and FindingsWe conducted mixing experiments in agitated vessels using Non-Newtonian blue maize flour suspensions. Acid or basic pulses were injected to reveal mixing patterns and flow structures and to follow their time evolution. No foreign pH indicator was used as blue maize flours naturally contain anthocyanins that act as a native, wide spectrum, pH indicator. We describe a novel method to quantitate mixedness and mixing evolution through Dynamic Color Analysis (DCA) in this system. Color readings corresponding to different times and locations within the mixing vessel were taken with a digital camera (or a colorimeter) and translated to the CIELab scale of colors. We use distances in the Lab space, a 3D color space, between a particular mixing state and the final mixing point to characterize segregation/mixing in the system.Conclusion and RelevanceBlue maize suspensions represent an adequate and flexible model to study mixing (and fluid mechanics in general) in Non-Newtonian suspensions using acid/base tracer injections. Simple strategies based on the evaluation of color distances in the CIELab space (or other scales such as HSB) can be adapted to characterize mixedness and mixing evolution in experiments using blue maize suspensions.

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Carbomer microgels as model yield-stress fluids

Jaworski

Spychaj

Story

et al. 2021

Reviews in Chemical Engineering

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The review presents current research results for Carbopol-based microgels as yield-stress materials, covering three aspects: chemical, physical and rheological. Such a joint three-aspect study has no analog in the literature. The chemical aspects of Carbopol polymers are presented in terms of a cross-linking polymerization of acrylic acid, their molecular structure, microgel formulation, polyacid dissociation and neutralization, osmotic pressure and associated immense microgel swelling. The physical characterization is focused on models of the shear-induced solid-to-liquid transition of microgels, which are formed of mesoscopic particles typical for soft matter materials. Models that describe interparticle effects are presented to explain the energy states of microgel particles at the mesoscale of scrutiny. Typical representatives of the models utilize attributes of jamming dispersions, micromechanical and polyelectrolyte reactions. Selected relationships that result from the models, such as scaling rules and nondimensional flow characteristics are also presented. The rheological part presents the discussion of problems of yield stress in 2D and 3D deformations, appearance and magnitude of the wall slip. The theory and characteristics of Carbopol microgel deformation in rotational rheometers are presented with graphs for the steady-state measurements, stress-controlled oscillation and two types of transient shear deformation. The review is concluded with suggestions for future research.

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The effects of neutralization on the dynamic rheology of polyelectrolyte microgel mucilages

Cited by 3 publications

References 29 publications

Bulk and surface rheology of Aculyn™ 22 and Aculyn™ 33 polymeric solutions and kinetics of foam drainage

Bulk and surface rheology of Aculyn™ 22 and Aculyn™ 33 polymeric solutions and kinetics of foam drainage

Studying Mixing in Non-Newtonian Blue Maize Flour Suspensions Using Color Analysis

Carbomer microgels as model yield-stress fluids

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