Interfacial energetics of two-dimensional colloidal clusters generated with a tunable anharmonic interaction potential

Hilou, Elaa; Du, Di; Kuei, Steve; Biswal, Sibani Lisa

doi:10.1103/physrevmaterials.2.025602

Cited by 25 publications

(24 citation statements)

References 41 publications

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“…However, attraction strength induced purely by the dye is limited to 0.6k B T, which is too small to allow the observation of vapor-liquid coexistence. Later, a tunable anharmonic attraction between paramagnetic particles that are confined within 2D was generated using a highfrequency rotating magnetic field [42]. By adjusting the strength of the interaction in a wide range, fluidlike clusters and crystallites with hexagonal ordering are observed.…”

Section: The Experimental Systemmentioning

confidence: 99%

Real-Space Mapping of the Two-Dimensional Phase Diagrams in Attractive Colloidal Systems

Xiao

Wang

et al. 2019

Phys. Rev. X

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Phase diagrams reflect the possible kinetic routes and guide various applications such as the designed assembly and synthesis of functional materials. Two-dimensional (2D) materials have been a focus of ongoing research due to their wide applications; therefore, researchers are highly motivated to discover the general principles that control the assembly of such materials. In this study, we map the 2D phase diagrams of short-and long-range attractive colloids at single-particle resolution by video microscopy. Phase boundaries, including (meta)critical or triple points and corresponding real-space configurations, are precisely specified. Profiles of 2D phase diagrams with attractive interactions resemble their 3D counterparts. For short-range systems, by measuring the deepest achievable supercooled states on the phase diagram, a "crater" structure surrounding the metastable fluid-fluid critical point indicates an enhanced nucleation rate within the crater and further suggests a local minimum of the free-energy barrier for crystallization in this area. During a dense fluid-mediated two-step crystallization process, we observe that multiple crystallites could form within a single dense fluid cluster, partly due to its highly amorphous shape. This highly amorphous shape is found for all observed well-developed dense fluid clusters. It is a supplement to the multistep nucleation process. For long-range systems, equilibrium vapor-liquid coexistence is observed, which paves the way for the exploration of critical behaviors. Rigidity percolation of crystallites, and bulk fluid-solid coexistence which provide clear evidence of a possible first-order transition for 2D melting, are observed for both systems. Our experiments reveal the general features of phase behaviors shared by 2D attractive systems including graphene, protein membranes, and adsorbed nanocrystals.

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Section: The Experimental Systemmentioning

confidence: 99%

Real-Space Mapping of the Two-Dimensional Phase Diagrams in Attractive Colloidal Systems

Xiao

Wang

et al. 2019

Phys. Rev. X

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“…In this work, we use low-dose liquid-phase TEM imaging to study the shaping process of NP supracrystals during post-nucleation growth. Aided by single-particle tracking, we find that the spatiotemporal fluctuations of the surface profiles of a growing supracrystal match quantitatively with CWT (Supplementary Movie 1 ), which has been prevalently used for equilibrated interfaces in micron-sized colloid 20 , 21 and atomic systems 22 – 26 . This match is demonstrated here on the single NP level—only accessible with liquid-phase TEM—showcasing the capability of our method to minimize long-standing complications from beam or substrate.…”

Section: Introductionmentioning

confidence: 70%

“…We validate the applicability of CWT to our system, which allows us to extract quantitative measures of anisotropic interfacial stiffness and interfacial mobility. CWT has been successfully applied to simulation studies of atomic interfaces 22 (e.g., Ni 23 , 24 , Ag 25 , Fe with different lattice structure 26 ) and experimental studies of micron-sized colloidal suspensions 20 , 21 , 40 , 42 , 48 , but not for a nanoscale fluctuating interface at the single building block resolution. We conduct FFT to decompose h ( x , t ), only accessible via our direct imaging, into a series of sinusoidal waves with different wave vectors as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Imaging how thermal capillary waves and anisotropic interfacial stiffness shape nanoparticle supracrystals

Yao

et al. 2020

Nat Commun

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Development of the surface morphology and shape of crystalline nanostructures governs the functionality of various materials, ranging from phonon transport to biocompatibility. However, the kinetic pathways, following which such development occurs, have been largely unexplored due to the lack of real-space imaging at single particle resolution. Here, we use colloidal nanoparticles assembling into supracrystals as a model system, and pinpoint the key role of surface fluctuation in shaping supracrystals. Utilizing liquid-phase transmission electron microscopy, we map the spatiotemporal surface profiles of supracrystals, which follow a capillary wave theory. Based on this theory, we measure otherwise elusive interfacial properties such as interfacial stiffness and mobility, the former of which demonstrates a remarkable dependence on the exposed facet of the supracrystal. The facet of lower surface energy is favored, consistent with the Wulff construction rule. Our imaging–analysis framework can be applicable to other phenomena, such as electrodeposition, nucleation, and membrane deformation.

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“…Colloidal monolayers are the subject of broad technological interest, principally because of their effectiveness in stabilizing foams and emulsion. The trapped particles sterically prevent the interfaces of the bubbles and drops from coalescing, and thereby maintain the stability of the intervening film of the dispersed phase ('Pickering' emulsions, Binks 2002;Herzig et al 2007;Wu & Ma 2016;Huang et al 2017). Colloidally stabilized dispersions find many applications in food products, consumer products (creams and lotions) and in materials fabrication (solid foams).…”

Section: Introductionmentioning

confidence: 99%

“…These particles are either attached to a gas/aqueous interface (e.g. Vandewalle et al 2012;Lumay et al 2013;Darras et al 2018) or are completely wetted by an aqueous phase and lie in a liquid layer immediately above an inverted planar meniscus (Zahn, Méndez-Alcaraz & Maret 1997;Rinn et al 1999;Kollmann et al 2002;Löwen et al 2005) or between two plates Hilou et al 2018). When the field is applied normal to the interface, the resultant magnetic dipoles repel each other, while when the field is applied with a horizontal component, the magnetized particles can move in the surface plane.…”

Section: Introductionmentioning

confidence: 99%

Pairwise hydrodynamic interactions of spherical colloids at a gas-liquid interface

et al. 2021

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Interfacial energetics of two-dimensional colloidal clusters generated with a tunable anharmonic interaction potential

Cited by 25 publications

References 41 publications

Real-Space Mapping of the Two-Dimensional Phase Diagrams in Attractive Colloidal Systems

Real-Space Mapping of the Two-Dimensional Phase Diagrams in Attractive Colloidal Systems

Imaging how thermal capillary waves and anisotropic interfacial stiffness shape nanoparticle supracrystals

Pairwise hydrodynamic interactions of spherical colloids at a gas-liquid interface

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