Hydrodynamic interactions between charged and uncharged Brownian colloids at a fluid-fluid interface

Dani, Archit; Yeganeh, M. S.; Maldarelli, Charles

doi:10.1016/j.jcis.2022.08.084

Cited by 4 publications

(4 citation statements)

References 116 publications

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“…The properties of particle-laden layers at the equilibrium depend on the nature of the interface, the particle-interface interactions, and inter-particle interactions. To predict the adsorption equilibrium, one should take into account the van der Waals and electrostatic interactions between all species, the interactions induced by the interface, such as the electrical double layer forces, capillary interactions, hydrodynamic interactions [62], and sometimes, also, externally actuated interactions. The interactions can be additionally modulated by the environmental conditions, for example pH, ionic strength, or temperature.…”

Section: Chemically Homogeneous Particles At Fluid-fluid Interfaces 2...mentioning

confidence: 99%

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Hybrid Nanoparticles at Fluid–Fluid Interfaces: Insight from Theory and Simulation

Borówko

Staszewski

2023

IJMS

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Hybrid nanoparticles that combine special properties of their different parts have numerous applications in electronics, optics, catalysis, medicine, and many others. Of the currently produced particles, Janus particles and ligand-tethered (hairy) particles are of particular interest both from a practical and purely cognitive point of view. Understanding their behavior at fluid interfaces is important to many fields because particle-laden interfaces are ubiquitous in nature and industry. We provide a review of the literature, focusing on theoretical studies of hybrid particles at fluid–fluid interfaces. Our goal is to give a link between simple phenomenological models and advanced molecular simulations. We analyze the adsorption of individual Janus particles and hairy particles at the interfaces. Then, their interfacial assembly is also discussed. The simple equations for the attachment energy of various Janus particles are presented. We discuss how such parameters as the particle size, the particle shape, the relative sizes of different patches, and the amphiphilicity affect particle adsorption. This is essential for taking advantage of the particle capacity to stabilize interfaces. Representative examples of molecular simulations were presented. We show that the simple models surprisingly well reproduce experimental and simulation data. In the case of hairy particles, we concentrate on the effects of reconfiguration of the polymer brushes at the interface. This review is expected to provide a general perspective on the subject and may be helpful to many researchers and technologists working with particle-laden layers.

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Section: Chemically Homogeneous Particles At Fluid-fluid Interfaces 2...mentioning

confidence: 99%

“…As a result, the shape of the particle changes, which in turn affects its ability to be trapped in the interface. Thus, the temperature is the important parameter controlling the adsorption of hairy particles on fluid-fluid interfaces [62].…”

Section: Individual Hairy Particles At Fluid-fluid Interfacesmentioning

confidence: 99%

Hybrid Nanoparticles at Fluid–Fluid Interfaces: Insight from Theory and Simulation

Borówko

Staszewski

2023

IJMS

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“…We simply treat the medium fluid as a bulk with constant viscosity η and use the fast Stokesian dynamics method described in ( 38 ) to account for hydrodynamic interactions between particles. This approximation is reasonable because the particles that we consider are jammed on the droplet interface and do not move much relative to each other, rendering interfacial corrections to the hydrodynamic mobility higher order ( 39 , 40 ). Furthermore, the literature has shown that even with the full resolution of a two-phase Stokesian fluid, corrections to the bulk hydrodynamic mobility are typically less than 10% ( 41 ).…”

Section: Methodsmentioning

confidence: 99%

Rolling of soft microbots with tunable traction

et al. 2023

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Microbot (μbot)–based targeted drug delivery has attracted increasing attention due to its potential for avoiding side effects associated with systemic delivery. To date, most μbots are rigid. When rolling on surfaces, they exhibit substantial slip due to the liquid lubrication layer. Here, we introduce magnetically controlled soft rollers based on Pickering emulsions that, because of their intrinsic deformability, fundamentally change the nature of the lubrication layer and roll like deflated tires. With a large contact area between μbot and wall, soft μbots exhibit tractions higher than their rigid counterparts, results that we support with both theory and simulation. Upon changing the external field, surface particles can be reconfigured, strongly influencing both the translation speed and traction. These μbots can also be destabilized upon pH changes and used to deliver their contents to a desired location, overcoming the limitations of low translation efficiency and drug loading capacity associated with rigid structures.

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“…While reports are available in the literature on the impacts of various particle attributes on the resulting interfacial microstructure at the air–water interface [ 31 , 32 , 33 , 34 , 41 , 42 , 47 , 48 , 49 , 50 , 51 ], understanding how the particle characteristics affect the resulting interparticle interactions and how to exploit these attributes in engineering the rheological properties of such interfacial particle network is an active area of research [ 52 , 53 ]. Moreover, the potential environmental concerns associated with some nanoparticles are driving a shift towards the use of larger particles in applications [ 54 ].…”

Section: Introductionmentioning

confidence: 99%

Particle Size and Rheology of Silica Particle Networks at the Air–Water Interface

Thakur

Razavi

2023

Nanomaterials

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Silica nanoparticles find utility in different roles within the commercial domain. They are either employed in bulk within pharmaceutical formulations or at interfaces in anti-coalescing agents. Thus, studying the particle attributes contributing to the characteristics of silica particle-laden interfaces is of interest. The present work highlights the impact of particle size (i.e., 250 nm vs. 1000 nm) on the rheological properties of interfacial networks formed by hydrophobically modified silica nanoparticles at the air–water interface. The particle surface properties were examined using mobility measurements, Langmuir trough studies, and interfacial rheology techniques. Optical microscopy imaging along with Langmuir trough studies revealed the microstructure associated with various surface pressures and corresponding surface coverages (ϕ). The 1000 nm silica particle networks gave rise to a higher surface pressure at the same coverage compared to 250 nm particles on account of the stronger attractive capillary interactions. Interfacial rheological characterization revealed that networks with 1000 nm particles possess higher surface modulus and yield stress in comparison to the network obtained with 250 nm particles at the same surface pressure. These findings highlight the effect of particle size on the rheological characteristics of particle-laden interfaces, which is of importance in determining the stability and flow response of formulations comprising particle-stabilized emulsions and foams.

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Hydrodynamic interactions between charged and uncharged Brownian colloids at a fluid-fluid interface

Cited by 4 publications

References 116 publications

Hybrid Nanoparticles at Fluid–Fluid Interfaces: Insight from Theory and Simulation

Hybrid Nanoparticles at Fluid–Fluid Interfaces: Insight from Theory and Simulation

Rolling of soft microbots with tunable traction

Particle Size and Rheology of Silica Particle Networks at the Air–Water Interface

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