Guiding kinetic trajectories between jammed and unjammed states in 2D colloidal nanocrystal-polymer assemblies with zwitterionic ligands

Zhang, Ziyi; Jiang, Yufeng; Huang, Caili; Chai, Yi; Goldfine, Elise A.; Liu, Feng; Feng, Wenqian; Forth, Joe; Williams, Teresa E.; Ashby, Paul D.; Russell, Thomas P.; Helms, Brett A.

doi:10.1126/sciadv.aap8045

Cited by 24 publications

(20 citation statements)

References 40 publications

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“…The live‐oligomeric surfactant also shows a superior ability in reducing the surface tension of water. Increasing R not only lowers the initial surface tension from 42.1 to 39.8 mN m −1 but also reduces the equilibrium surface tension from 34.2 to 29.6 mN m −1 , indicating that the triamine/SDS oligomeric surfactant forms, jams rapidly at the liquid–air interface, and then offers a robust assembly with low surface tension, which is similar to nanoparticle surfactant jamming . (Figure e).…”

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confidence: 86%

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

et al. 2019

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self-cleaning and antifouling ability for repelling the deposition of other materials and liquid confining properties for enhancing printing resolution and avoiding coffee-ring effects. [13] However, inertial water drops impacting superhydrophobic surfaces can bounce off quickly or splash violently. [14][15][16][17][18][19][20][21][22][23] Undesired rebound and splash cause material waste [24] and weaken the related performance and efficiency. Many attempts have been conducted to promote water drop spreading on hydrophobic surfaces by using polymers [1,23,[25][26][27][28] or surfactants. [22,[29][30][31][32] However, these two methods still have drawbacks for achieving drop deposition, not to mention uniform spreading: 1) Polymer additives can delay drop retraction but leave drops with hemispherical shape and nonuniform material distribution on the hydrophobic substrate.2) The poor wettability and large mole cular weight of polymer additives restrict the ejecting process during inkjet printing. 3) Surfactant additives can promote drop spreading in a static state owing to the reduced surface tension (γ); [33] however, the low surface tension increases the instability of the impacting drop and leads to drop splashing with satellite droplets, according to the Kelvin-Helmholtz instability, [34] k max ∼ 2ρ a U r 2 /3γ (ρ a is the air density). It is therefore a great challenge for uniform shape spreading on superhydrophobic surfaces without any loss of the drops. Here, we show a new and simple strategy for uniform round-shape drop spreading on superhydrophobic surfaces after high-speed impact, up to 5.0 m s −1 , by utilizing live-oligomeric surfactant jamming, diethylenetriamine/sodium dodecyl sulfate (triamine/SDS). The live-oligomeric surfactant, which noncovalently constructed by SDS and triamine through electrostatic interaction, has a dynamic equilibrium between monomer surfactant and oligomeric surfactant. Figure 1 shows the contrast spread dynamics of a liveoligomeric surfactant drop and other drops impacting superhydrophobic surfaces at an impacting velocity (U ) of 2.42 m s −1 from side and bottom views (Movie S1, Supporting Information). The diameter (D 0 ) of pure water and the surfactant drops is ≈2.25 and 1.90-2.00 mm, respectively (Figure S1, Supporting Information for experimental setup). The Weber number (We), We = ρDV 2 /γ, of water, SDS, N2C3/SDS, triamine/SDS, and 12-3-12-3-12 is 182. 68, 295.29, 358.29, 383.00, and 292.29, respectively. The superhydrophobic surface [35] composed of random micro-nanostructures of typical size and spacing of Inkjet printing of water-based inks on superhydrophobic surfaces is important in high-resolution bioarray detection, chemical analysis, and highperformance electronic circuits and devices. Obtaining uniform spreading of a drop on a superhydrophobic surface is still a challenge. Uniform round drop spreading and high-resolution inkjet printing patterns are demonstrated on superhydrophobic surfaces without splash or rebound after high-speed impacting by introducing...

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confidence: 86%

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

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“…Chai et al used in situ AFM at the oil–water interface to relate pendant drop tensiometry measurements to adsorption kinetics and areal densities of NP surfactants (Figure a) . Recently, the latter group have further refined their technique and used it to interrogate the structure and mechanical properties of polyoxometalates and colloidal nanocrystals at the liquid–liquid interface …”

Section: Assembly Dynamics and In Situ Characterization Of Nanomatementioning

confidence: 99%

“…In a recent work that advanced the material novelty and functional properties of NP surfactants, Zhang et al generated magnetically responsive nanocrystal surfactant assemblies ( Figure ) . Fe 3 O 4 nanocrystals that had been stripped of their coordinating ligands, leaving the underlying crystalline structure of the nanocrystals intact (“naked” nanocrystals, NNCs) were dispersed in dimethylformamide (DMF) .…”

Section: Reconfigurable Time‐evolving All‐liquid Materialsmentioning

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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“…In many previously reported interfacial systems, the recovery of interfacial tension, as well as the fading of wrinkles, would occur when the packing density passed a threshold of glassy interface formation, such that the interface relaxes to an equilibrium state by desorption of surfactant particles . In this lignin‐based system, however, several pieces of evidence suggested a different mechanism.…”

Section: Resultsmentioning

confidence: 85%

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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Guiding kinetic trajectories between jammed and unjammed states in 2D colloidal nanocrystal-polymer assemblies with zwitterionic ligands

Abstract: A framework is presented to control phase transformations in colloidal nanocrystal assemblies at liquid-liquid interfaces.

Cited by 24 publications

References 40 publications

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

Uniform Spread of High‐Speed Drops on Superhydrophobic Surface by Live‐Oligomeric Surfactant Jamming

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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