Colloidal interactions mediated by end-adsorbing polymer-like micelles

Helgeson, Matthew E.; Wagner, Norman J.

doi:10.1063/1.3624754

Cited by 24 publications

(23 citation statements)

References 37 publications

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“…Surfactant was observed to adsorb onto the nanoparticles and measurements of the energetics combined with models for polymer bridging provide a method for understanding how nanoparticle-directed network formation builds viscoelasticity [58]. Subsequent measurements by Helgeson show that branching induced by nanoparticle addition can suppress shear banding instabilities as the branching reduces flow-alignment of the micelles [59].…”

Section: Inducing Branching By Nanoparticle Additionmentioning

confidence: 99%

Rheology of branched wormlike micelles

Rogers

Calabrese

Wagner

2014

Current Opinion in Colloid & Interface Science

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127

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Section: Inducing Branching By Nanoparticle Additionmentioning

confidence: 99%

Rheology of branched wormlike micelles

Rogers

Calabrese

Wagner

2014

Current Opinion in Colloid & Interface Science

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127

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“…[33] Specifically, it was found that the ratio R g /a (where R g is the radius of the bridging polymer), which sets the range for the bridging attractions, [119] produced a clear separatrix in the rheological behavior. For R g /a > 0.01 (small droplets), the gels exhibit solid-like behavior reminiscent of highly elastic gels, with elastic moduli that increase with increasing droplet size, presumably due to a larger number of bridging polymers per droplet, and therefore stronger interdroplet bridging.…”

Section: Weak Attractions: Fluid-like Clusters and Transient Networkmentioning

confidence: 99%

Colloidal behavior of nanoemulsions: Interactions, structure, and rheology

Helgeson

2016

Current Opinion in Colloid & Interface Science

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117

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Nanoemulsions exhibit unique behavior due to their nanoscopic dimensions, including remarkable droplet stability, interactions and rheology. These properties are significantly enhanced by nanoscopic droplet size, as well as selection of surfactant and other molecular species in solution. Electrostatic and polymer-induced interdroplet interactions are particularly powerful tools for fine-tuning the interdroplet interactions, and have led to stimuli-responsive nanoemulsion systems that provide deep insight into their unique properties. As such, nanoemulsions have emerged as powerful model systems for studying a number of colloidal phenomena including suspension rheology, repulsive and attractive colloidal glasses, aggregation processes, colloidal gelation and phase instability, and associative network formation in polymer-colloid mixtures. This review summarizes recent advances in understanding the colloidal behavior of nanoemulsions, and provides a unifying framework for understanding the various complex states that emerge, as well as perspective on emerging challenges and opportunities that will advance the use of nanoemulsions in both fundamental colloid science and technological applications. Highlights We review efforts to understand & control colloidal behavior of nanoemulsions.  Electrostatic and polymer-induced interdroplet interactions are discussed.  Repulsive interactions lead to jammed and compressed states at low volume fraction.  Attractive interactions lead to clustering, gelation and colloidal phase separation.  Nanoemulsions are model fluids to study arrested states in colloidal dispersions.

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“…The influence of the confining surfaces upon the confined solutions is reflected in the effective interaction between those surfaces [1,[21][22][23][24]. Such surface interactions, and how they vary upon variation of the separation between the surfaces, can be probed experimentally by techniques such as surface-force balance methods or colloidal probe atomic force microscopy (CP AFM) [25,26].…”

Section: Introductionmentioning

confidence: 99%

Near-second-order transition in confined living-polymer solutions

Korobko

Besseling

2016

Phys. Rev. E

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We analyze a near-second-order transition occurring in solutions of living polymers confined by two parallel surfaces in equilibrium with a reservoir solution. The molecular self-consistent field theory in the regime of weak adsorption or depletion is mapped to phenomenological Landau theory, where the order parameter is the average degree of polymerization or, equivalently, the normalized chain-end concentration. The distance between two surfaces at which the transition occurs scales as 2 c |c| where c is the correlation length of the polymer solution in the reservoir and c −1 is de Gennes adsorption length. In the second half of the paper we focus on experimentally observable features. The predicted transition can be detected experimentally by probing the living-polymer mediated disjoining potential between surfaces by means of, e.g., colloidal probe atomic force microscopy. To facilitate experimental investigations we derive simple explicit expressions for the disjoining potential for several regimes. By comparison with full numerical calculations it was verified that these are quite accurate.

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Colloidal interactions mediated by end-adsorbing polymer-like micelles

Cited by 24 publications

References 37 publications

Rheology of branched wormlike micelles

Rheology of branched wormlike micelles

Colloidal behavior of nanoemulsions: Interactions, structure, and rheology

Near-second-order transition in confined living-polymer solutions

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