Role of capillarity and microstructure on interfacial viscoelasticity of particle laden interfaces

Barman, Sourav; Christopher, Gordon F.

doi:10.1122/1.4935128

Cited by 48 publications

(31 citation statements)

References 57 publications

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“…The relative contribution from the two governing parameters is not readily apparent, although the particle-particle interaction strength which is controlled by the sub-phase electrolyte concentration is shown to have a dramatic influence on the magnitude of the viscoelastic moduli, in good agreement with previous observations. [54] However, while the magnitude of the viscoelastic responses were different, it is interesting to note that the viscoelastic ratio for all three systems appeared to plateau towards G'/G" ~ 3.0 (Fig. 4b), underlining that the shear viscoelastic response becomes independent of the surface pressure when the particles are in a close-packed lattice above a critical surface coverage, , i.e.…”

Section: Interfacial Rheologymentioning

confidence: 89%

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

Zhang

Biggs

et al. 2018

Journal of Colloid and Interface Science

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Particle-stabilized emulsions and foams are widely encountered, as such there remains a concerted effort to better understand the relationship between the particle network structure surrounding droplets and bubbles, and the rheology of the particle-stabilized interface. Poly(vinylpyrrolidone)-coated silica nanoparticles were used to stabilize foams. The shear rheology of planar particle-laden interfaces were measured using an interfacial shear rheometer and the rheological properties measured as a function of the sub-phase electrolyte concentration and surface pressure. All particle-laden interfaces exhibited a liquid-like to solid-like transition with increasing surface pressure. The surface pressure-dependent interfacial rheology was then correlated to the formed micron-scale structures of the particle-laden interfaces which were imaged using a Brewster angle microscope. With the baseline knowledge established, foams were prepared using the same composite particles and the particle network structure imaged using cryo-SEM. An attempt has been made to correlate the two structures observed at a planar interface and that surrounding a bubble to elucidate the likely rheology of the bubble stabilizing particle network. Independent of the sub-phase electrolyte concentration, the resulting rheology of the bubble stabilizing particle network was strongly elastic and appeared to be in a compression state at the region of the L-S phase transition.

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Section: Interfacial Rheologymentioning

confidence: 89%

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

Zhang

Biggs

et al. 2018

Journal of Colloid and Interface Science

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“…In a follow-up paper, Barman et al [144] further investigate the correlation between interparticle forces, microstructure and rheology by changing salt concentration and surface-coverage for the same system under oscillatory shear ( figure 11(a)). They find that adding more salt leads to stronger interparticle attraction, which they attribute to screening of the dipole repulsive interaction.…”

Section: Shear Rheologymentioning

confidence: 99%

Interfacial rheology of model particles at liquid interfaces and its relation to (bicontinuous) Pickering emulsions

Thijssen

Vermant

2017

J. Phys.: Condens. Matter

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Interface-dominated materials are commonly encountered in both science and technology, and typical examples include foams and emulsions. Conventionally stabilised by surfactants, emulsions can also be stabilised by micron-sized particles. These so-called Pickering-Ramsden (PR) emulsions have received substantial interest, as they are model arrested systems, rather ubiquitous in industry and promising templates for advanced materials. The mechanical properties of the particle-laden liquid-liquid interface, probed via interfacial rheology, have been shown to play an important role in the formation and stability of PR emulsions. However, the morphological processes which control the formation of emulsions and foams in mixing devices, such as deformation, break-up, and coalescence, are complex and diverse, making it difficult to identify the precise role of the interfacial rheological properties. Interestingly, the role of interfacial rheology in the stability of bicontinuous PR emulsions (bijels) has been virtually unexplored, even though the phase separation process which leads to the formation of these systems is relatively simple and the interfacial deformation processes can be better conceptualised. Hence, the aims of this topical review are twofold. First, we review the existing literature on the interfacial rheology of particle-laden liquid interfaces in rheometrical flows, focussing mainly on model latex suspensions consisting of polystyrene particles carrying sulfate groups, which have been most extensively studied to date. The goal of this part of the review is to identify the generic features of the rheology of such systems. Secondly, we will discuss the relevance of these results to the formation and stability of PR emulsions and bijels.

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“…The transition to yielding was reported to take place at

, which is lower than the surface coverage required for jamming (

) [ 245 ]. The rheological behavior at the interface appeared to be regulated by the mesostructural organization of the microstructures highlighting the importance of local interparticle interactions in tailoring desirable rheology in interfacial systems [ 246 ]. It should be noted that using the same polystyrene particles, aggregation has also been achieved at the decane/water interface through the addition of 0.1 M NaCl and 0.1 mM SDS surfactant in the sub-phase.…”

Section: Interfacial Rheologymentioning

confidence: 99%

Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

2021

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The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.

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Role of capillarity and microstructure on interfacial viscoelasticity of particle laden interfaces

Cited by 48 publications

References 57 publications

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

The rheology of polyvinylpyrrolidone-coated silica nanoparticles positioned at an air-aqueous interface

Interfacial rheology of model particles at liquid interfaces and its relation to (bicontinuous) Pickering emulsions

Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

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