Transition in Dynamics as Nanoparticles Jam at the Liquid/Liquid Interface

Cui, Mengmeng; Miesch, Caroline; Kosif, Irem; Nie, Huarong; Kim, Paul Y.; Kim, Hyunki; Emrick, Todd; Russell, Thomas P.

doi:10.1021/acs.nanolett.7b03159

Cited by 31 publications

(41 citation statements)

References 54 publications

(81 reference statements)

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“…For the interfacial jamming of particles at liquid–liquid interface, this behavior came into being with the Pickering emulsions and has been explored both by simulation and experiment . In a jamming process, the interfacial monolayer undergoes a “liquid‐like” to “solid‐like” transition, with significantly enhanced mechanical properties, and more importantly, jamming opens a new pathway to arrest interfacial tension‐driven morphological variation in liquid–liquid or liquid–gas systems and, therefore, stabilize two‐phase morphologies having nonequilibrium shapes, for example, nonspherical drops and bubbles, and bijels . However, to achieve long‐term stability of the structured liquids or bubbles, neutral wetting conditions of colloidal particles at the interface are essential.…”

Section: Structured Liquids: From “Liquid‐like” To “Solid‐like”mentioning

confidence: 99%

Nanoparticle Assembly at Liquid–Liquid Interfaces: From the Nanoscale to Mesoscale

2018

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In the past few decades, novel syntheses of a wide range of nanoparticles (NPs) with well-defined chemical composition and structure have opened tremendous opportunities in areas ranging from optical and electronic devices to biomedical markers. Controlling the assembly of such well-defined NPs is important to effectively harness their unique properties. The assembly of NPs at liquid-liquid interfaces is becoming a central topic both in surface and colloid science. Hierarchical structures, including 2D films, 3D capsules, and structured liquids, have been generating significant interest and are showing promise for physical, chemical, and biological applications. Here, a brief overview of the development of the self-assembly of NPs at liquid-liquid interfaces is provided, from theory to experiment, from synthetic NPs to bio-nanoparticles, from water-oil to water-water, and from "liquid-like" to "solid-like" assemblies.

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Section: Structured Liquids: From “Liquid‐like” To “Solid‐like”mentioning

confidence: 99%

Nanoparticle Assembly at Liquid–Liquid Interfaces: From the Nanoscale to Mesoscale

2018

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Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

“…Grazing incidence X‐ray scattering (GISAXS) has been used to this end, where a finely collimated X‐ray beam impinges on the liquid–fluid interface and the scattered X‐rays provide information on the packing of the NPs averaged over the footprint of the beam . If the incident X‐rays are coherent, the time dependence of the X‐ray speckle pattern can be used to characterize the in‐plane dynamics of the NPs assembled at the interface . GISAXS provides information not only about packing symmetry and interparticle spacing within the monolayer, but also about particle arrangement in the direction normal to the interface.…”

Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

“…Several techniques have also been developed to understand the dynamics of interfacially assembled NP monolayers. Using X‐ray photon correlation spectroscopy (XPCS), i.e., the X‐ray analog of dynamic light scattering, Cui et al recently studied NP‐stabilized emulsions, observing a transition in NP dynamics from a liquid‐like state to an interfacially jammed state (Figure b) . The limited timescale over which the dynamics measured by XPCS can be complemented and significantly extended by fluorescence recovery after photobleaching (FRAP) …”

Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

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Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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imparts novel mechanical and functional properties to the macroscopic interface itself. These properties include size-and charge-selective pathways for molecules and particulates, shear and compressive moduli, and selective binding and reaction sites. Complex interfaces can then be used to generate complex, macroscopic, all-liquid materials with very high surface areas that have unique properties, such as compartmentalization, communication between compartments, and the ability to move and reconfigure. With the rapid growth in the study of complex materials made from interfacially structured liquids, there is a need to review the field from the funda-Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications. Figure 2.Interactions between particles attached to liquid-fluid interfaces. a) Dipole-dipole interactions between adsorbed particles due to asymmetric charge distributions near the surface of particles at interfaces. Reproduced with permission. [34] Copyright 1980, American Physical Society. b) Dipole-dipole interactions give rise to 2D colloidal crystals with large lattice spacings. Scale bar, 50 µm. Reproduced with permission. [36]

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“…Wrapping has also been developed as a functionalization tool to endow 3D objects with desired properties, such as hydrophobicity, optical properties, or conductive properties . Most recently, the range of wrapped content has expanded to liquids, with the encapsulant being either solid elastic films or solid‐like jammed films of functional particles . These films are rigid enough to stabilize nonequilibrium morphologies of the wrapped liquid, thus breaking the limit of equilibrium morphologies and further creating new shapes of wrapped, encapsulated fluids with inimitable functionalities.…”

Section: Introductionmentioning

confidence: 99%

A Cast Net Thrown onto an Interface: Wrapping 3D Objects with an Interfacially Jammed Amphiphilic Sheet

Cui

Gao

Bowland

et al. 2020

Adv Materials Inter

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with the encapsulant being either solid elastic films [12][13][14][15][16] or solid-like jammed films of functional particles. [17][18][19][20][21] These films are rigid enough to stabilize nonequilibrium morphologies of the wrapped liquid, thus breaking the limit of equilibrium morphologies and further creating new shapes of wrapped, encapsulated fluids with inimitable functionalities.For traditional liquid-phase technologies, a liquid-like layer of surfactant or particles is usually used for wrapping and stabilizing liquid droplets. [22][23][24] Recent studies show that sufficiently thin elastic sheets offer a novel path to spontaneously wrap liquid droplets using capillary forces, where the elastic energy of curving sheets is balanced by the reduction of interfacial energy. [15,16,25,26] Although negligible at macroscopic scales, capillary forces become dominant and are able to bend the elastic sheets when the bending rigidity of elastic sheets is vanishingly small. [12,15,25] The robust elastic sheets allow the liquid drops to be trapped in nonequilibrium 3D shapes via a process that is usually referred to as capillary origami. [12,16,26] In previous wrapping studies, the final encapsulated 3D geometry was almost solely determined by the initial geometry of the flat thin elastic sheets, which made the process complicated and lacked versatility. The elastic sheets in previous reports were often conventional polymer thin films whose interfacial activities were too weak to manipulate the interfacial tension and participate in morphology evolution. [12,15,16] A large-scale elastic sheet [27] with a significant interfacial activity is desired to manipulate the interface that can adapt to various nonequilibrium shapes by external influence-a stimulant for evolved morphologies at the interface.Here, we report in situ formation of a large-scale surfactant sheet with strong interfacial activities by interfacial jamming of poorly soluble amphiphilic lignin macromolecules in particulate form at an oil/water interface. The amphiphilic nature of the surfactant sheet enables wrapping of either water or oil droplets, while its rigidity allows it to hold the liquid phases in various nonequilibrium morphologies. The surfactant sheet is physically networked by reversible hydrogen bonding and π-π interaction, which endows it with transforming and self-healing ability. The strong interfacial activity of the surfactant sheet results in an interfacial instability, which drives evolution of interfacial morphology and novel wrapped microstructures.Wrapping a 3D object with a 2D sheet is not uncommon, but the wrapping behavior becomes complex and interesting when the sheet is bestowed with strong interfacial activities. Amphiphilic lignin macromolecules, isolated from biomass, form a scalable thin surfactant sheet at an oil/water interface through the interfacial jamming process. The process marks three distinct stages of interfacial behavior: a) diffusive assembly, b) viscous assembly with retarded mobility, and c) flexible yet irre...

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Transition in Dynamics as Nanoparticles Jam at the Liquid/Liquid Interface

Cited by 31 publications

References 54 publications

Nanoparticle Assembly at Liquid–Liquid Interfaces: From the Nanoscale to Mesoscale

Nanoparticle Assembly at Liquid–Liquid Interfaces: From the Nanoscale to Mesoscale

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

A Cast Net Thrown onto an Interface: Wrapping 3D Objects with an Interfacially Jammed Amphiphilic Sheet

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