Directional and Reconfigurable Assembly of Metallodielectric Patchy Particles

Wang, Zuochen; Wang, Zhisheng; Li, Jiahui; Wang, Yufeng

doi:10.1021/acsnano.1c00104

Cited by 29 publications

(39 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1D materials (chains and fibers) with anisotropic morphology can offer distinct mechanical, optical, and electronic properties, whereas 2D films are essential for their integration into functional devices 36 – 38 . Producing low-dimensional structures via assembly often requires highly directional colloidal interactions or relies on the use of external fields 11 , 39 , 40 . As we show, such structures can be realized with as-synthesized MOF particles in a single step.…”

Section: Resultsmentioning

confidence: 99%

Low-dimensional assemblies of metal-organic framework particles and mutually coordinated anisotropy

Lyu

Payong

et al. 2022

Nat Commun

Self Cite

View full text Add to dashboard Cite

Assembling metal-organic framework (MOF)-based particles is an emerging approach for creating colloidal superstructures and hierarchical functional materials. However, realization of this goal requires strategies that not only regulate particle interactions but also harness the anisotropic morphologies and functions of various frameworks. Here, by exploiting depletion interaction induced by ionic amphiphiles, we show the assembly of a broad range of low-dimensional MOF colloidal superstructures, including 1D straight chains, alternating or bundled chains, 2D films of hexagonal, square, centered rectangular, and snowflake-like architectures, and quasi-3D supercrystals. With well-defined polyhedral shapes, the MOF particles are mutually oriented upon assembly, producing super-frameworks with hierarchically coordinated crystallinity and micropores. We demonstrate this advantage by creating functional MOF films with optical anisotropy, in our cases, birefringence and anisotropic fluorescence. Given the variety of MOFs available, our technique should allow access to advanced materials for sensing, optics, and photonics.

show abstract

Section: Resultsmentioning

confidence: 99%

Low-dimensional assemblies of metal-organic framework particles and mutually coordinated anisotropy

Lyu

Payong

et al. 2022

Nat Commun

Self Cite

View full text Add to dashboard Cite

show abstract

“…When the AC field is applied on a Janus ellipsoid with a metal tip (ϕ = 0), the ellipsoid’s longitudinal axis is aligned with the direction of applied field. − As a result, the ellipsoid propels linearly along the Z -direction (Figure a,f). Note that such linear motion along the Z -direction is observed in metallodielectric ellipsoids with Janus tip which is not the case with Janus spheres.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Electric Field-Driven Active Propulsion of Patchy Microellipsoids

et al. 2021

View full text Add to dashboard Cite

Active colloids are a synthetic analogue of biological microorganisms that consume external energy to swim through viscous fluids. Such motion requires breaking the symmetry of the fluid flow in the vicinity of a particle; however, it is challenging to understand how surface and shape anisotropies of the colloid lead to a particular trajectory. Here, we attempt to deconvolute the effects of particle shape and surface anisotropy on the propulsion of model ellipsoids in alternating current (AC) electric fields. We first introduce a simple process for depositing metal patches of various shapes on the surfaces of ellipsoidal particles. We show that the shape of the metal patch is governed by the assembled structure of the ellipsoids on the substrate used for physical vapor deposition. Under high-frequency AC electric field, ellipsoids dispersed in water show linear, circular, and helical trajectories which depend on the shapes of the surface patches. We demonstrate that features of the helical trajectories such as the pitch and diameter can be tuned by varying the degree of patch asymmetry along the two primary axes of the ellipsoids, namely longitudinal and transverse. Our study reveals the role of patch shape on the trajectory of ellipsoidal particles propelled by induced charge electrophoresis. We develop heuristics based on patch asymmetries that can be used to design patchy particles with specified nonlinear trajectories.

show abstract

“…The critical voltage for the active-overexcited transition decreases as the frequency increases, presumably due to the fact that the screening effect from electric double layers is weakened. 60 This effect is also responsible for the fact that MIL96-3 does not display the overexcited state at low frequencies and low voltages. In comparison, MIL96-4 and MIL96-5 exhibit only the steady and overexcited states and no active state.…”

Section: ■ Resultsmentioning

confidence: 99%

“…The propulsion velocities at the active state are shown in Figure S6. The critical voltage for the active-overexcited transition decreases as the frequency increases, presumably due to the fact that the screening effect from electric double layers is weakened . This effect is also responsible for the fact that MIL96- 3 does not display the overexcited state at low frequencies and low voltages.…”

Section: Resultsmentioning

confidence: 99%

Polyhedral Micromotors of Metal–Organic Frameworks: Symmetry Breaking and Propulsion

Wang

et al. 2021

J. Am. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Colloidal micromotors can autonomously propel due to their broken symmetry that leads to unbalanced local mechanical forces. Most commonly, micromotors are synthesized to possess a Janus structure or its variants, having two components distinct in shape, composition, or surface joined together on opposite sides. Here, we report on an alternative approach for creating micromotors, where microcrystals of metal–organic frameworks (MOFs) with various polyhedral shapes are propelled under an AC electric field. In these cases, symmetry breaking is realized by orienting the polyhedral particles in a unique direction to generate uneven electrohydrodynamic flow. The particle orientations are controlled by a delicate competition between the electric and gravitational forces exerted on the particle, which we rationalize using experiments and a theoretical model. Furthermore, by leveraging the MOF types and shapes, or surface properties, we show that the propulsion of MOF motors can be tuned or reversed. Because of the flexibility in designing MOFs and their one-step scalable synthesis, our strategy is simple yet versatile for making well-defined functional micromotors.

show abstract

Directional and Reconfigurable Assembly of Metallodielectric Patchy Particles

Cited by 29 publications

References 55 publications

Low-dimensional assemblies of metal-organic framework particles and mutually coordinated anisotropy

Low-dimensional assemblies of metal-organic framework particles and mutually coordinated anisotropy

Fabrication and Electric Field-Driven Active Propulsion of Patchy Microellipsoids

Polyhedral Micromotors of Metal–Organic Frameworks: Symmetry Breaking and Propulsion

Contact Info

Product

Resources

About