Soft water-soluble microgel dispersions: Structure and rheology

Omari, Abdelaziz; Tabary, René; Rousseau, David; Leal-Calderón, Fernando; Monteil, Julien; Chauveteau, G.

doi:10.1016/j.jcis.2006.07.006

Cited by 62 publications

(39 citation statements)

References 22 publications

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“…This corresponds to Maxwell-type behaviour with a single relaxation time that may be determined from the crossover point and, this relaxation time increases with concentration. For cross-linked microgel dispersions, it exhibits G' and G" being almost independent of oscillation frequency (Omari et al, 2006;Rubinstein & Colby, 2003). This technique has been used to characterize the network structure in seroglucan/borax hydrogel (Coviello et al, 2003), chitosan based cationic hydrogels (Kempe et al, 2008;Sahiner et al, 2006) and a range of other hydrocolloids (AlAssaf et al, 2006b).…”

Section: Rheologymentioning

confidence: 99%

Hydrogels: Methods of Preparation, Characterisation and Applications

Gulrez¹,

Al-Assaf²,

Phillips³

2011

Progress in Molecular and Environmental Bioengineering - From Analysis and Modeling to Technology Applications

259

178

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Section: Rheologymentioning

confidence: 99%

Hydrogels: Methods of Preparation, Characterisation and Applications

Gulrez¹,

Al-Assaf²,

Phillips³

2011

Progress in Molecular and Environmental Bioengineering - From Analysis and Modeling to Technology Applications

259

178

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“…This corresponds to Maxwell-type behavior with a single relaxation time that may be determined from the crossover point, and this relaxation time increases with concentration. For cross-linked microgel dispersions, G' and G" are exhibited as almost independent of oscillation frequency [61,62]. This technique has been used to characterize the network structure in seroglucan-borax hydrogel [63], chitosan-based cationic hydrogels [64,65], and a range of other hydrocolloids [54].…”

Section: Rheologymentioning

confidence: 99%

Nanostructured Hydrogels

Montoro¹,

Medeiros²,

Alves³

2014

Nanostructured Polymer Blends

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“…While the principal applications of starch and biopolymer microgels are in foods, they are also utilized across a diverse range of applications including cosmetics, coatings, material composites, and packaging. In addition, due to their unique rheological properties combined with low cost, both starch [64] and polysaccharide [65][66][67][68] microgels have been utilized in oil field applications (see also Chapter 16).…”

Section: Biopolymer Microgels For Food and Other Applicationsmentioning

confidence: 99%

“…In oil field applications, the shear gel process has also been particularly relevant to the use of cross-linked polymers in fracturing fluids [66][67][68]. Hydraulic fracturing involves fracturing low permeable rock by pumping at high rate and pressure a thickened fluid containing suspended solids (proppants) that prevent sealing of the fractures after well treatment.…”

Section: Biopolymer Microgels and Particle Anisotropymentioning

confidence: 99%

Rheology of Industrially Relevant Microgels

Stokes

2011

Microgel Suspensions

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Microgels are currently used in a broad range of industrial applications and consumer products, including surface coatings, paints, inks, oil recovery, controlled drug delivery, cosmetics, personal care, home care, food, and pharmaceuticals. An essential feature in many of these applications is the rheology of the microgel suspension during processing, storage, and transport, as well as during the application process itself (i.e., at the in-use or end-use stage). Microgel suspensions have a long history of use for rheological control due to their ability to swell in a suitable solvent to give increased viscosity and/or a gel-like consistency. Starches, which are essentially cross-linked carbohydrate polymers, are probably the oldest example of a microgel; they were separated from grains by the ancient Greeks for a variety of uses including foods, adhesives, and even wound healing, where the latter was achieved by mixing with saliva to form a honey-like coating [1].The attraction of microgel suspensions in industrial applications is that their rheology can be controlled to meet the requirements for specific applications by varying composition, cross-link density, particle size, shape, surface properties, and solvent quality. A useful feature of microgels is their responsive nature to their environment; they can swell or deswell by altering solvent quality (through pH, temperature, ions, etc.), thus altering their effective phase volume and consequently the rheological properties of the suspension. The deformable and swellable nature of microgels allows a higher phase volume to be obtained compared to hard spheres of equivalent size. Their deformability also affects their response in shear flow due to their ability to change shape in response to perturbation, particularly at high volume fractions. The composition of microgels can be adapted and customized according to the application, and the microgel additives used have been made out of a wide variety of polymeric materials including natural or modified biopolymer-based components (e.g., polysaccharides, proteins, and starches), and synthesized components such as polyacrylates, poly(styrene sulfonates), poly(vinyl pyridine), and polyurethanes. Microgel Suspensions: Fundamentals and ApplicationsEdited

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Soft water-soluble microgel dispersions: Structure and rheology

Cited by 62 publications

References 22 publications

Hydrogels: Methods of Preparation, Characterisation and Applications

Hydrogels: Methods of Preparation, Characterisation and Applications

Nanostructured Hydrogels

Rheology of Industrially Relevant Microgels

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