Suspensions of Soft Colloidal Particles

Vlassopoulos, Dimitris; Cloître, Michel

doi:10.1017/9781108394826.007

Cited by 5 publications

(4 citation statements)

References 281 publications

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“…This exponential divergence of the viscosity, yield stress, and moduli with the volume fraction is typically observed in suspensions of soft particles, including highly branched or star polymers, dendrimers, microgels, and polymer-grafted colloids and is distinct from the power law behavior usually observed for concentrated solutions of linear polymer chains. The empirical scaling observed for the α-1,3-glucan dispersions in this work is consistent with the physical state of the sample as presented in Figure as well as the dynamic yielding in Figure a.…”

Section: Resultsmentioning

confidence: 80%

Rheological Behavior for α-1,3-Glucan Derived from Enzymatic Polymerization of Sucrose

Giacomin

Kim

Wagner

2022

ACS Food Sci. Technol.

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Semi-crystalline, water-insoluble α-1,3-glucan, found naturally in mushrooms, can be applied as a structuring material and is produced industrially through enzymatic polymerization of sucrose as a sustainable material. However, a basic understanding of its rheological properties as a function of composition and processing is needed for many applications. In this work, we find that rheological shear history and weight fraction define the viscosity profiles, which can be further modeled using a Cross model with common exponent m′ = 1.183 and characteristic relaxation time of C = 0.0772 s, confirming soft solid behavior typically observed for suspensions. Relative viscosities, yield stress, and elastic and viscous moduli show exponential growth with the skeletal volume fraction, ϕdry. Suspensions prepared with a polymer of varying polymerization chain lengths, from 260 to 930 degrees of polymerization, show similar rheology at the same wt % solids. These results and their parameterization provide valuable information for the α-1,3-glucan product and process design.

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Section: Resultsmentioning

confidence: 80%

Rheological Behavior for α-1,3-Glucan Derived from Enzymatic Polymerization of Sucrose

Giacomin

Kim

Wagner

2022

ACS Food Sci. Technol.

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“…This topic has received considerable attention over the last two decades essentially for the case of mixtures involving nonadsorbing components [8,9]. Mixtures of hard sphere colloids and linear polymer have been extensively studied both experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

Glassy states in adsorbing surfactant–microgel soft nanocomposites

Goujard¹,

Suau²,

Chaub³

et al. 2021

J. Phys.: Condens. Matter

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Mixtures of polymer-colloid hybrids such as star polymers and microgels with nonadsorbing polymeric additives have received a lot of attention. In these materials, the interplay between entropic forces and softness is responsible for a wealth of phenomena. By contrast, binary mixtures where one component can adsorb onto the other one have been far less studied.Yet real formulations in applications often contain low molecular weight additives that can adsorb onto soft colloids. Here we study the microstructure and rheology of soft nanocomposites made of surfactants and microgels using linear and nonlinear rheology, SAXS experiments, and cryo-TEM techniques. The results are used to build a dynamical state diagram encompassing various liquid, glassy, jammed, metastable, and reentrant liquid states, which results from a subtle interplay between enthalpic, entropic, and kinetic effects. We rationalize the rheological properties of the nanocomposites in each domain of the state diagram, thus providing exquisite solutions for designing new rheology modifiers at will.

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“…For hard spherical particles, which undergo transitions from a disordered fluid phase to a crystalline phase at relatively low volume fractions, 12 their Brownian diffusion can be affected by hydrodynamic or interparticle interactions. 13−15 In contrast, ultrasoft particles such as polymer coils behave as amorphous fluids even at very high volume fractions, 16 and their dynamics is controlled by the elasticity of the chains, the deformability of the core, and entanglement. 17,18 For systems in between, including microgels, made of cross-linked polymeric networks swollen by a solvent, or star polymers, consisting of long polymeric arms connected to a central core, the dynamical behavior depends also on the compressibility and interdigitation of the particles.…”

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confidence: 99%

“…So-called “soft particles” refer to a class of objects with a dual character somewhere between hard colloids and polymer coils. − Common examples of these particles include microgels, − micelles, , and star polymers, − whose phase behaviors and dynamics change as the level of their softness increases. For hard spherical particles, which undergo transitions from a disordered fluid phase to a crystalline phase at relatively low volume fractions, their Brownian diffusion can be affected by hydrodynamic or interparticle interactions. − In contrast, ultrasoft particles such as polymer coils behave as amorphous fluids even at very high volume fractions, and their dynamics is controlled by the elasticity of the chains, the deformability of the core, and entanglement. , For systems in between, including microgels, made of cross-linked polymeric networks swollen by a solvent, or star polymers, consisting of long polymeric arms connected to a central core, the dynamical behavior depends also on the compressibility and interdigitation of the particles. − These interactions for soft systems can suppress crystallization and lead to direct transitions to glassy and jammed states. ,− Thus, the design of custom-made particles intermediate between the hard and ultrasoft limits plays a key-role for the general understanding of phenomena such as the origin of glass transition or the formation of densely packed states. − …”

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confidence: 99%

M13-Phage-Based Star-Shaped Particles with Internal Flexibility

Zavala-Martínez,

Grelet

2023

ACS Nano

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We report on the construction and the dynamics of monodisperse star-shaped particles, mimicking, at the mesoscale, star polymers. Such multiarm star-like particles result from the self-assembly of gold nanoparticles, forming the core, with tip-linked filamentous viruses (M13 bacteriophages) acting as spines in a sea urchin-like structure. By combining fluorescence and dark-field microscopy with dynamic light scattering, we investigate the diffusion of these hybrid spiny particles. We reveal the internal dynamics of the star particles by probing their central metallic core, which exhibits a hindered motion that can be described as a Brownian particle trapped in a harmonic potential. We therefore show that the filamentous viruses and specifically their tip proteins behave as entropic springs, extending the relevance of the study of such hybrid mesoscopic analogues of star polymers to phage biotechnology.

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Suspensions of Soft Colloidal Particles

Cited by 5 publications

References 281 publications

Rheological Behavior for α-1,3-Glucan Derived from Enzymatic Polymerization of Sucrose

Rheological Behavior for α-1,3-Glucan Derived from Enzymatic Polymerization of Sucrose

Glassy states in adsorbing surfactant–microgel soft nanocomposites

M13-Phage-Based Star-Shaped Particles with Internal Flexibility

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